Pump and fan - water ring vacuum pump

Vacuum pneumatic conveying system,to take advantage of vacuum pump keep certain vacuum degree in the pipeline.Have large pump suction type suction pipe section,at startup is also commonly used vacuum pump gas filling water.The commonly used vacuum pump water ring vacuum pump.Water ring vacuum pump is actually a kind of compressor,it extracts container gas pressure motor magnet in above atmospheric pressure,the resistance will be able to overcome the exhaust gas discharged into the atmosphere.Water ring vacuum pump structure diagram is shown in figure 1-8.Twelve blade impeller 1 in a cylinder of the pump shell 2 eccentric.Inject a certain amount of water in the pump.The impeller rotates,motor run capacitor to water to form a water ring pump shell,the inner surface of the ring and the impeller wheel tangent.


Due to different heart pump casing and impeller,the right wheel and water intake space between electricalmotor1.blogspot.com 4 gradually expand,thus forming a vacuum,making gas by the intake pipe 3 into the pump intake space 4.Then gas into the left side,due to the hub ring between volume was increased gradually and the compression pressure,so the exhaust gas space outside the exhaust pipes of 5 and 6 is to pump.Vacuum pump should be ac electric motor constantly replenish water at work to ensure formation water ring and take away the friction heat.China's production of water ring vacuum pump with SZ and SZB,the former top pressure of 205.933 Kpa (as compressor available).SZB is small cantilever type vacuum pump.Table 1-3 is SZ water ring type vacuum pump performance profile.

Classification of ac motor

1,according to the working power supply classification:depending on the motor working power supply,can be divided into direct current motor and ac motor.Which ac motor is also divided into single-phase motor and three-phase motor. single phase generator 2,according to the structure and working principle of classification:motor according to the structure and working principle can be divided into small electric motors asynchronous motor and synchronous motor.Synchronous motor can also be divided into permanent magnet synchronous motor,synchronous motor and magnetic resistance motor with hysteresis.Asynchronous motor can be divided into ac induction motor and motor commutator.Induction motor is divided into three phase asynchronous motor,single-phase asynchronous motor and cover pole asynchronous motor.Communication is divided into single-phase series motor commutator motor,ac/dc motors and repulsion motor. 3,according to the classification of start-up and operation mode:the motor according to the start-up and operation mode can be divided www.dongfeng-motor.com into capacitor start motor,capacitor contributed to motor,capacitor start motor running and split-phase motors. 

4,according to the rotor structure classification:according to the structure of the rotor can be divided into the cage induction motor (old standard called squirrel-cage asynchronous motor) and wound rotor induction motor (wound asynchronous motor is called old standard). 5,according to the speed of classification:can be divided into the high speed motor,motor at low speed,constant speed motor and speed regulating motor.Has general is series of brush type ac motor,commonly used in small electric tools,such as some electric hair dryer,hand electric drill,the vacuum cleaner...Work with electric spark,noise is very big,but small size,large torque.Startup capacitor is used to produce to split phase of electrical motor single-phase ac power supply,using capacitor capacitive reactance of alternating current (ac),and after a coil in series,the overall current phase shift than simple inductor current phase shift,which USES two different phase current,the magnetic field to produce a different time,such as three-phase alternating current (ac),form a rotating magnetic field.

The total current measurement method

It is through the detection of IC power into the line of the total current,a method to judge strengths and weaknesses of IC.Because internal IC for the vast majority of direct coupling,IC damage asynchronous motor (such as a breakdown ac electric motor or open a p-n junction) will cause level after saturated with globe,bringing the total current change.So by measuring the electricalmotor1.blogspot.com total current method can judge of IC.Also available measure the voltage drop,power supply channel resistance,using ohm's law diesel generators prices to calculate the total current value.

Research on the positioning control of asynchronous motor - scheme design

 At the beginning of the three-phase ac asynchronous motor brake,the commonly used inverter control,when go downhill to a lower end (e.g.,50 RPM),switch to this system.Due to the ac motor is strong coupling,multi-variable,nonlinear complex controlled object,more difficult to establish accurate mathematical model,and fuzzy control motor magnet does not need to establish a precise mathematical model of controlled object,has strong robustness.In practice,a motor with load is uncertain,but there are a range of.By fuzzy control to determine the location in a certain range.Energy consumption braking of ac motor parts motor is a motor spindle speed is zero,the braking torque to zero as well,so,in the motor brake mode choice with the method of braking energy.

Braking energy: the energy generator generator set consumption of the asynchronous motor brake,the stator winding of the motor from three-phase power source and immediate access to the stator winding dc current.No dc power supply,can be used as shown in figure 1 a circuit;If a dc power supply,can be used as shown in figure b connection mode.Circuit shown in figure 1,the normally open contacts of contactor KM1,when closed to the three-phase ac power supply,motor stator motor running on electric state.For braking energy,can make the power coil,contactor XK acmotortrading.blogspot.com motor from three-phase ac power supply.Immediately make the contactor coil electricity KM2,normally open contacts closed KM2,within two phase winding of the stator flux into the dc power supply.

The structure of three phase asynchronous motor

A,the classification of the three-phase asynchronous motor:Classification:according to the rotor structure Category:squirrel-cage motor and wound rotor motor According to the protection type Categories:open (IP11),protected (IP22 and IP23),closed (IP44),explosion-proof According to the ventilation cooling way Categories:self-cooled,since fan cooled,he fan cooled,pipes,ventilated According to ac synchronous motor the installation structure Categories:horizontal,vertical foot,flange According to the grades of insulation Category:E,B,F,H, According to the work quota Category:continuous,intermittent,intermittent Description:Open (IP11) :cheaper price,the best cooling conditions,due to the rotor windings and exposed to air,can only be used for dry,little dust and no corrosive and explosive gas environment.Protected (IP22 and IP23) :ventilation cooling condition is good,also can prevent the water droplets and iron filings,sundry fall into motor internal,applies only to a few dry and dust and no corrosive and explosive gas environment.Enclosed (IP44) :suitable for damp,dusty,vulnerable to wind and rain erosion,corrosive gases,such as the poor working rotor and stator environment,the most common applications.

Second,the structure of the three-phase asynchronous motor (a) of the stator (static) 1,the stator core Part of motor magnetic circuit,and placed on the stator winding.Structure:the stator iron core by 0.35 ~ 0.5 mm thick surface is commonly insulating layer of silicon steel sheet coining,overlying and become,within the core of the circle has a uniform distribution trough,which embedded in the stator winding.Trough the stator core has the following kinds:Semi-closed type slot:frequency conversion motor efficiency and power factor is higher,but the winding wire and insulation are more difficult.Commonly used in low-voltage motor.Half-open mouth slot:can put molding winding embedded,commonly used in large and medium-sized low-voltage motors.The so-called forming the windings can be treated with insulation in advance and then into the slot.Open rack slot:to put molding winding embedded,insulation method is convenient,mainly used in high voltage motor.2,the stator winding Access is the circuit part of the motor,three-phase alternating current (ac),to produce a rotating magnetic field.Structure:by the three in the space between 120 ° Angle,said arrangement can be connected with the same structure of the winding,the winding of the coil respectively according to certain rule embedded in the stator slot.The main of the stator winding insulation project has the following three:(guarantee between the conductive part of the winding and iron core and reliable insulation and reliable insulation between the winding itself) (1) of insulation:overall between the stator core and stator winding insulation.(2) and white insulation:insulation between each phase of the stator winding.(3) the turn-to-turn insulation:each phase of the stator winding turn-to-turn insulation each wire.

Ya si column three-phase asynchronous motor

The no-load current is too large,If ruled out the possibility of a lack of phase operation,it is likely to: motor magnet 1,may have a slight internal winding short circuit.generator generator set 2,actuator or motor itself bearing rust,mechanical 12v motor resistance is too large.If continue to use wholesalemotor.blogspot.com the output power will reduce,also may be further failure,so that finally cannot be used.

The choice of servo motor electrical engineer

 The choice of servo motor, the distinction between general electrical engineer in accordance with the generally divided into stepper motor, a dc servo motor, brushless dc servo motor, ac servo motor, with the increasingly progress of science and technology, many special servo motor arises at the historic moment, such as piezoelectric motor, linear motor, and the voice coil motor, here we mainly talk about general servo motor selection. Choose what kind of servo motor, to a large extent depends on the physical properties of the load, the load of job characteristics, system requirements and the working environment. Once the system requirement, no matter choose what kind of rotor cutting machine form of servo motor, the first thing to consider is right choose how much of a motor, main consideration physical characteristic of load, including the load torque, moment of inertia, etc. In the servo motor, usually measured in torque or force motor size, so choosing motor first to calculate the equivalent to the size of the shaft end load torque or force. After calculate the torque demand to set aside part of allowance, generally choose motor for times the load torque, torque to the ac synchronous motor reliable running of motor. 

In addition also needs computing reduced to the size of the shaft end load inertia, generally choose the load inertia: motor rotor inertia, to ensure the rapidity of the servo system response. If appear between the motor and load inertia, torque does not match the situation, so only at the expense of speed, increase speed reducer between the motor and load, then you need balance. After selected by how much torque motor, needs to do is to understand the working characteristic of load and working environment. Work load features include such as load is high or low speed running, the acceleration needs to how much, if demand is frequent start-stop, how frequency requirements, system running precision and so on. Then choose servo motor also has no specific rules to follow, the key is your choice of motor must adapt to work to beg you load movement. Such as the system accuracy is not high, the movement speed around hundreds of the following (not more than 500 RPM) but not too low (greater than 1), does not need to frequent start-stop, stepper motor is a kind of good choice. This is due to the stepper motor open-loop control, low control precision, acmotortrading.blogspot.com high speed, motor torque will drop quickly, will take the fixed load, low speed will be rotating discontinuous crawl phenomenon, and the response of the stepper motor is not fast, not suitable for frequent startup applications. When the speed a few turn to more than 3000 turn, relative to demand higher control precision, can choose straight flow or ac servo motor.

The difference between the speed reducer and frequency converter speed control

Electrical engineers Through the difference between the speed reducer and frequency converter speed control of mechanical devices often need to adjust the speed of three-phase asynchronous motor,often use reducer adjustment change frequency reduction ratio or transducer to adjust the speed of the motor. But by what is the difference between the speed reducer and frequency converter speed control? Together (see electrical engineer) to take us to get to know it.Reducer speed:Reducer is through mechanical transmission device to reduce the motor (motor) speed,such as common gear deceleration,turbine worm reducer,etc.Through the reducer to adjust the speed of the motor general need to make sure the following information:1,the types and specifications of the motor,speed,power (or torque),starting characteristics,short-term overload capacity,the moment of inertia,etc.2,the types of mechanical work,specifications,purpose,rotational speed and power (or torque). Working system: constant load or changing load,variable load load diagram; Rev.,braking and short-time overload torque,start frequency; Shock and vibration levels; Direction of rotation,motor and reducer coupling way,whether the shaft extension with radial force and axial force.3,installation type (reducer and motor,the relative position of working machine,vertical and horizontal).

4,transmission ratio and the margin of error.5,environmental temperature,air velocity,dust concentration and environmental conditions such as ph value; (if there is a circulating lubrication and cooling conditions,lubrication station) and the limitation on the vibration and noise.6,to the degree of service life,Motor vehicle safety and reliability requirements.7,the requirement for the size and weight.8,the demands induction motor price of operation and control.9,the source of material,blank,standard parts and inventory.10,on volume,cost and price requirements.11 and delivery term.Frequency converter speed control:Inverter is by changing the frequency of alternating current motor (motor) in order to achieve the purpose of speed regulation. Reduce the motor speed by the frequency converter,you can achieve the goal of energy saving. But generally within 0-50 hz frequency conversion motor to realize the constant torque speed control,within the scope of 50-100 hz to realize constant power speed regulation,and stepless speed regulation,wide speed range.To sum up,through the difference between the speed reducer and frequency converter speed control is mainly: reducer speed a wider range of speed (slow),but generally not stepless speed regulation,speed regulating motor after a lot of physical and electrical parameters can be continued,in addition to the speed loss; And use frequency converter speed control can realize stepless speed regulation,but limited range of speed (only within 3 -- 100 hz speed),speed when affected by a lot of electric parameters,and can't guarantee the original motor of the number of parameters,and fever more serious.

WTD/YBT/YTD series elevator motors

Using permanent magnet synchronous motor of elevator traction system,usually a gearless traction.Highlight the permanent magnet synchronous motor is easy to make the advantages of low speed and high power.Its compact structure,complete functions,traction motor,traction wheel,electromagnetic brake,in a photoelectric encoder,and easy to install,easy to use.Especially in the development and application of machineroomless elevator,the permanent magnet synchronous electrical motor 12v 1000w traction motor installed in the hole of the lift,the room of construction cost is saved,and beautify the appearance of the building.The wholesalemotor.blogspot.com control chart is shown in figure 4.When the load changes,the permanent magnet synchronous motor by adjusting the Angle between 8 to adapt,its response is fast.


In order to make the elevator has the good comfortable starting and brake and leveling accuracy,joined the accurate rotor and stator rotor position in the system unit and voltage current detection device,determine the size of the motor magnetic field,direction at any time.Position detection device using rotor position sensor (photoelectric encoder or rotating transformer,etc.).Capsules load detection device can ac motor wind generator use a variety of forms such as position,pressure,to measure and calculate in advance,the elevator load given proper direction and the size of the moment,can switch output,analog (voltage) and frequency (hf anti-jamming is strong,can remote transmission),etc.The feedback signal is compared with the given signal,computing,according to the predetermined control mode control,can get better than that of the other performance of the drive system.

Three-phase asynchronous motor open phase running fault

Lack of phase operation reason (1) the star connection broken a phase power supply.(a) as shown in figure 8,when the motor is running,for some reason,there is a phase circuit (such as W phase winding in the L3 disconnect),then in the W phase winding current,two phase winding become series relationship between rotor and stator U and V,pick up on the 380 V voltage,while two flows winding the same current,which is lack of phase operation.The motor still can continue to operate,but the work of the two phase winding,on both ends of each phase voltage is 190 v (phase voltage 220 v) in normal working conditions.Due to the phase voltage is reduced,rotating magnetic flux are reduced accordingly.But the load constant,the output torque of the motor is constant,so the stator current will increase.In addition,according to the analysis of power Angle of the normal work of the motor,three-phase winding average burden of power will increase,the winding current must be increased.In short,a phase winding,when the power is the single phase asynchronous motor burden of the remaining two phase winding.At this point in the winding current value is greater than the motor overload current,but smaller than short circuit current.

(2) delta connection broken a phase power supply.(b) as shown in figure 8,if L3 disconnect,then pick up the entire winding between two phase,which is lack of phase operation.Although the three-phase windings are working at this time,but they ac geared motor have not symmetric winding,but M phase winding facies V phase winding in series,and then winding parallel with U.In this case,the current in the winding,power is not tight and normal power current,power is different at work.Two branch current is not balanced.The theory and practice have proved that winding to delta connection,once broken a photograph,can form large circulation inside the motor winding,a very short time will burn out motor winding,the harm than y connection of motor open phase running is more serious.(3) delta connection within a phase of winding circuit.(c) as shown in figure 8,when the two phase of the motor winding form v-shaped connection,this connection,the starting torque is too small.The original ban motor starting; The motor is running,and the cut-off current is 0,is not to do work,the rest of the two phase winding load is aggravating,current increases,increased winding temperature rise.

The inverter from what respect to protection on the motor

Abstract:the frequency converter is widely used in various industries,mainly due to its energy saving and the function of the frequency control of motor speed in the working condition of equipment and system application,the frequency converter from what respect to the protection of motor? Tags:frequency control,frequency converter,motor,energy-saving frequency converter is widely applied in industry control engineering net all rights reserved,mainly due to its energy saving and the function of the frequency control of motor speed in the working condition of equipment and system application,so the inverter is from what respect to the protection of motor? Below we will analyze this problem solve.Frequency converter for motor protection mainly has the following several aspects:over voltage protection,low voltage protection,over current protection,open phase protection,reverse phase protection,overload protection,earthing protection,short circuit protection,overclocking protection and protection of the stall.

Here are the several types of the frequency converter for motor protection method were introduced simply.1.The over voltage protection:the inverter output voltage detection function,frequency converter can automatically adjust the output voltage,the motor is not withstand overvoltage.Even if the output voltage and output voltage adjustment by more rotor and stator than 110% of the normal voltage,electric motor cooling fan frequency converter can also through the outage protection for motor.2.The under voltage protection:when the voltage is less than 90% of the normal voltage of the motor,frequency converter to protect downtime.3.The over current protection:when the motor current by more than 150% of the rating / 3 seconds,or 200% of the rated current / 10 microseconds,frequency converter through the downtime to protect the motor.4.Open phase protection:monitoring the output voltage,when the output phase,frequency converter alarm,after a period of time frequency converter through the downtime to protect the motor.5.Reverse protection:frequency converter motor can only rotate along one direction,unable to set the direction of rotation,unless the user changes motor wiring A,B,C phase sequence,there is no reverse phase.

6.Overload protection:monitoring frequency converter motor current,when the motor current is more than 120% of the rated current / 1 minute,the frequency converter via down to protect the motor.7.Grounding protection:frequency converter is equipped with special grounding protection circuit,generally made up of earthing protection of the transformer and relay,when a phase or two phase ground,inverter alarm.If the user requirements,of course,we can also design for the grounding protection immediately after downtime.8.Short circuit protection:after the inverter output short circuit,inevitably cause over-current,within 10 microseconds inverter through down to protect the motor.9.Overclocking protection:frequency converter has a maximum and minimum frequency limit function,make the output frequency can only be within the prescribed scope,thus realizing the overclocking protection function.10.Stalling protection:general for synchronous motor stalling protection.For asynchronous motor CONTROL ENGINEERING China all rights reserved,accelerate the process of stall will be performance for current,frequency converter by over current and overload protection to realize the protection function.Reduction in the process of stall can be set in the process of debugging to avoid safety deceleration time.

The cause of the motor starting bad? What are those?

When start the switch after the closing of the motor,the motor not only noise,rotating or cannot achieve normal speed,then for motor starting,shall immediately stop the fault motor,check the reason,the magnet prices main reason:(1) mechanical damage or stuck;www.dongfeng-motor.com (2) the rotor circuit there may be offline or poor contact. Squirrel-cage motor generator stator end ring and copper bar connection damage; Winding type motor rotor ac motor wind generator rheostat circuit disconnect,the connection of the cable damage,there was something wrong with brush device,fuses and the slip ring connection damage and so on.(3) a phase stator loop break line;(4) of the stator circuit wiring errors.

What is internal overvoltage?

Internal overvoltage is due to the operation (switch,switch) accident (grounding,bolt,etc.) or other reasons,cause sudden changes in the state of the power system,there will be a shift from a steady state to another steady state transition process,the system may be produced in the process is in danger of overvoltage,the overvoltage is within the system caused by the electromagnetic energy buildup of oscillation and,so called internal overvoltage.It can be divided into operating overvoltage and resonance overvoltage,the former is generated single phase induction motor by system operation or fault,which is in the grid cell capacity and inductance components in grid (especially with iron core of ferromagnetic inductance components),parameters of unfavorable combination resonance.Because impact relay action is to rely on impact current,the launch of the signal () to accuse or accident signal circuit action,to make impact relays XMJ repetitive movements,namely the requirements after the first pulse signal action immediately return,ready for action again.

At this point if you don't add the keep circuit,pulse signal disappears,electric motors 12 volt sound (buzzer or alarm) will end immediately.Issued in order to guarantee reliable sound signal,without impact relay XMJ back and stop,so in startup sound in the middle of the relay circuit with a stay.Operation at execution time because the guardian,the guardian hands perform operation shall not exceed a.Sequence of operation shall not be temporary.Each perform a,the guardian is responsible for the inspection before permanent magnet generators for sale operation after location and preparation of votes,people listened to correct after the operation,the guardian operations are executed immediately.Each performed in red ink.Performed the operation ticket cover chapter executed,save for three months,the director of the substation should check once a month operation. In the following situations power capacitor should be work out immediately,and report the scheduling: (1) the power capacitor explosion; (2) joint serious overheating or melt; (3) casing put serious lightning collaterals; (4) capacitor serious injection or fire; (5) www.facebook.com/dongfeng.motor more than 40 ℃ ambient temperature.

Early study of permanent magnet synchronous motor

Early study of permanent magnet synchronous motor mainly in fixed frequency power supply of the working characteristic of the permanent magnet synchronous motor research,especially the research of steady-state characteristics and direct starting performance.Permanent magnet synchronous motor starting directly depend on damping windings provides asynchronous torque motor speed up to close to synchronous speed,and the magnetic resistance torque and torque will be synchronous motor pull in sync.V.B.H onsinger and M.A.R ahman et al.A lot of research work has been done in this single phase capacitor start induction motor respect.In the eighty s,foreign to inverter power supply of permanent magnet synchronous motor for further research.Inverter power supply of permanent magnet synchronous motor with direct starting of the structure of the permanent magnet synchronous motor are basically the same,but in most cases without damping windings.Damping winding has the following characteristics: first,damping winding to generate heat,make the permanent magnet temperature rise; Second,increase the moment of inertia,damping winding motor moment of inertia ratio decline; Third,the tooth of the damping winding make pulsating torque increases.

In inverter power supply situation,it will affect the original characteristics of permanent magnet synchronous motor,the steady state and transient characteristic of permanent magnet synchronous motor with a constant frequency compared with different features.A large number of papers published after 1980 study the mathematical model of permanent magnet synchronous motor,the steady state characteristics,dynamic characteristics.A.V.G umaste research such as the voltage type inverter power supply of permanent magnet synchronous motor steady state characteristics and the current type inverter power supply of permanent magnet synchronous motor steady-state characteristics.With the constant improvement of the permanent magnet synchronous motor speed control system performance requirements,the perkins diesel generator need to design high efficiency,high moment of inertia ratio,high energy density of permanent magnet synchronous motor,G.R.S lemon and others diesel generator for speed control system dynamic performance and high efficiency requirements quickly,modern design method of permanent magnet synchronous motor is presented.With the development of microcomputer technology,permanent magnet synchronous motor vector control system of full digital control also has made great development.D.N aunin a permanent magnet synchronous motor is developed,such as right amount control system,using a 16 bit single chip microcomputer 8097 as control computer,realizes the high accuracy,high dynamic response of full digital control.In the late eighty s,early ninety s B.K.B ose and published a large number of permanent magnet synchronous motor vector control system of full digital control of the paper.

Speed controller of permanent magnet synchronous motor vector control system usually adopts proportional integral (PI) control.PI controller has a simple structure,good performance and is not sensitive to controlled object parameters change,etc.In 1991,R.B.S epe adopts self-tuning control in the speed controller for the first time.Early adaptive control is mainly used in dc motor adjustable beam system.National Taiwan university tian-hua liu and so on for the first time the robust control theory is applied to permanent magnet synchronous motor servo drive.Motor in the process of running,the model and the parameter is constantly changing,the change of the parameters and model will cause to reduce the performance of control system.All kinds of robust control technology in modern control theory to make the control system in the model and parameter changes to protect the good control performance.Will,therefore,all kinds of robust control technology used in motor speed regulation,can greatly improve the performance of speed control system.In this regard,the use of more successful control technology mainly include: adaptive control,variable structure control,parameter identification technology,etc.

Some knowledge of the earth

When required by the design without,at the top of the grounding device buried depth of not less than 0.6 meters.Round steel,Angle steel,and copper tube ground level should be buried,vertical spacing not permanent magnet generators for sale less than 5 meters,grounding device should concentrate,lead the grounding device in parallel with main welding into a loop - grounding network.Grounding network has reliable grounding,grounding resistance is small,the characteristics of suitable for the need of a large number of electrical equipment grounding,more used to power distribution,large workshop and other places,pressure is the most important function generator stator of grounding network,namely to equal to the voltage of each node on the net.


To safe operation of the equipment and personal safety play an important role,covers an area of big but potential distribution uniformity,fever when the ground current is big is small,less electrolyte corrosion.For earth cover an area of an electric motors 12 volt area small but potential distribution and corrosion.From artificial grounding device of horizontal distance of not less than 3 meters,the depth of the grounding line is not less than 1 meter.For more than ten years of practice has proved that not so much important,grounding resistance than grounding device structure is more reasonable and important.Now city,in a building with many different properties of electrical equipment,need wholesalemotor.blogspot.com a variety of grounding device,such as lightning protection grounding,electrical safety,communication power supply working grounding,communications and computer systems (also called dc grounding,grounding in digital logic system called logic),etc.,so many system which adopts heavy good grounding? Now explain one by one as follows: according to the practice proved that the common grounding is most widely used method.

Single polar stepper motor

This kind of stepper motor is referred to as the single polarity because each mini electric motor winding current to flow along one direction only.It is also referred to as the two line stepper motor,because it only contains two coils.The reverse polarity,two coil winding on the same core,with the same intermediate tap.Single polar stepper motor also referred to as 4 phase stepper motor,because it has four excitation winding.Single polarity of stepper motor fuses have 5 or 6.If the leads of the stepper motor is 5 root,then one of them is connected to the public line f v +),the other four phase 4 root respectively connected to the motor.If the leads of the stepper motor is 6,so it is more sections of a unipolar stepper motor has two windings,each winding have asked tap in a lead.But how to distinguish the lead? Please continue to read the following content.Identify five line single polar stepper motor connector In order to find out the single phase induction motor five line every single polar stepper motor lead properly configured,needs to be done in advance a actually very simple.

Figure 1 shows the five line of stepper motor's basic lead configuration.electric motors 12 volt In order to find the right order and make the motor rotation,lead to a battery and a tape (of course also need a five step motor 1 lead.Lead is ready marker to indicate to tell them apart.In the following steps: (1) using digital multimeter find public line.Other fuses with the public line resistance measurement of q values are the same.The line is connected to the battery v +.5 v or 6 v is enough test.(2) tape affixed to the stepper motor output of uranium,and make it became a sign out perpendicular to the shaft end.The function of this flag is to determine whether the motor rotation.(3) any pick out a lead is called phase 1.If the grounding wire,the motor output shaft will do slight rotation.Now step motor is locked in the position of phase 1.As shown in wholesalemotor.blogspot.com figure 2.(4) get another wire and the ground,look carefully on the output shaft tape.If the output shaft rotate slightly to the right,then the root lead is phase 2.As shown in figure 3.(5) take another thread,the grounding and observe carefully on the output shaft of tape.If the output shaft rotate slightly to the left,then the root lead is phase 4.As shown in figure 4.6 and then take another line and its grounding,careful observation on the output shaft tape motion state.If the output shaft does not rotate,then the root lead is phase 3.As shown in figure 5.

Measuring rotor winding connection is wrong use method of failure

Put the rotor under small electric fan motor test in a test in the mouth,use the turn-to-turn short circuit tester electricity,tester within the closed magnetic circuit core and rotor core has alternating magnetic flux.Multimeter is 10 v ac voltage profile,wholesalemotor.blogspot.com adjacent commutator segment and commutator segment,every piece of commutator segment,every two pieces of commutator segment,every three to every more pieces commutator segment between the voltage value.Rotor winding connection correct voltage size should electricalmotor1.blogspot.com be consistent,if you have below normal,it is possible that some components lead to reverse,with the fault of rotor winding to repair to meet again. "Little experience" Described above with a multimeter ac 10 v voltage profile measuring voltage between adjacent the commutator segment,as there are below normal,should turn the rotor position,and then look at the voltage value,so as high efficiency electric motor to avoid miscalculation.If still below normal,should be cleaned of mica slot commutator conductive material (such as charcoal powder),then test again,in order to avoid miscalculation.

Ac motor speed control method

Three-phase asynchronous motor speed control method,can have change very logarithmic p (speed regulating pole change motor),change frequency f1 (VVVF) and s (change slip acmotor2.blogspot.com speed) three.Change the power supply frequency f,slip ratio of the motor very logarithmic p and s can be too much to change speed.From the perspective of the nature of speed regulation,different ways of governing is nothing but change synchronous ac motor synchronous speed or not turn two.Widely used in the production of machinery is not the change in speed control method of synchronous speed of wound rotor motor rotor series resistance speed governing,chopping speed regulation,cascade speed regulation and application of the electromagnetic slip clutch,hydraulic coupling,such as oil film clutch speed regulation.


Changes of the synchronous speed logarithmic multi-speed motor,stator can change of the stator voltage,frequency,frequency control of electric motors 12 volt motor speed has no commutator motor speed regulation and so on.From energy point of view,when there is high speed control method and low speed control method of two kinds: an induction refers to the ac electric motor motor effective speed control is constant,so there is no slip loss,such as multi-speed motor,frequency control of motor speed and slip loss can be recovered speed control methods (such as cascade speed regulation,etc.).Have slip loss speed regulation method belongs to the low speed,such as rotor series resistance speed control method,the energy loss in the rotor circuit; Electromagnetic clutch speed regulation method of energy loss in the clutch coil; Hydraulic coupler speed regulation and energy loss in the oil of single phase asynchronous hydraulic coupling.In general slip loss increases with expanding range of speed regulation,if the speed range is not big,energy loss is small.

Medium and small capacity of asynchronous motor is generally what protection is there?

(1),short circuit protection:general fuse is short circuit protection device;(2),loss of pressure protection:magnetic starter solenoid coil in starting motor control circuit loss of pressure protection.Automatic air switch,auto voltage step-down compensator are generally equipped with a pressure loss tripping device,so that in the above two cases plays a role of overload protection of
motor.(3),overload protection,thermal relay is the motor overload protection device.16,in asynchronous motor operation maintenance work should be paid attention to what?

(1),around the motor motor should be kept clean;(2),with the instrument to check the change of the power supply voltage and the current situation,general motors allow voltage fluctuation for the rated voltage of plus or minus 5%,the difference between the three phase voltage shall not be greater than 5%,the phase single phase asynchronous motor current unbalance value should not exceed 10% And attention should be paid to determine whether the lack of phase operation;(3),regularly check the temperature of the motor,commonly used thermometer temperature,temperature rise shall not exceed the maximum allowed should be paid attention to;(4),listening to the 5kw permanent magnet generator bearings with or without abnormal noise,sealing is good,and regularly to replace lubricating oil,the oil change period,general sliding bearing is 1000 hours,500 hours of rolling bearings.(5),pay attention to the motor sound,smell,vibration and transmission device.During normal operation,the motor should be uniform sound,no www.facebook.com/dongfeng.motor noise and special sound.

The choice of single-phase capacitor electric mechanical and electrical capacity

The choice of single-phase capacitor small electric fan motor electric mechanical and electrical capacity Most of single-phase motor capacitor,such
acmotor2.blogspot.com as washing machines,electric fans,submersible pump,small woodworking planer,etc.But due to capacitor spoiled or improper selection capacity,Motor running temperature,noise,power consumption increases,the speed is reduced,the phenomenon such as torque decreases,here the selection of electrical and mechanical capacity of the capacitor motor approach to electricity Work friends can do a introduction,for your reference. Calculation method 1:Single-phase capacitor electric mechanical and electrical capacity depends on the size of the deputy winding current.

Because of different sizes,single phase motor power to consider when choosing capacitance rev Dynamic torque,speed,temperature,noise and loss should be within the normal range.So first of all should from the nameplate detect single-phase motor power,calculate the primary winding of the electricity Flow,and then according to the primary winding current (0.5 0.7) times to perkins diesel generator set calculate the current value of each winding current,according to the formula C = IC * 10 divided by 2 PI fVo.The formula of the I I = P = V is obtained. 2:the selection of capacitor Single-phase capacitor motor should first choose oil-immersed capacitor,pressure value should be above 400 v.Second optional www.facebook.com/guohong.trading ac electrolytic capacitor,its small size,low prices,but life Life is a bit short.

The principle of leakage protector

The action principle of leakage protection switch is:on an iron core.there are two groups:one input and one output current winding winding current.when there is no leakage.input current and output current is equal.in the core flux vector and zero.would not be in the third winding induction electric potential.or on the third winding will be induced voltage to form.to drive actuator enlargement.switch trip.In front of the UPS and the leakage protection switch.in spite of UPS no generator stator leakage phenomenon.but as a result of every harmonic formed in core flux vector and due to the hysteresis effect of iron core is not zero.then appeared similar to the appearance of the leakage.the leakage protector the frequent trip.Leakage will electric motors 12 volt wire \ zero at the same time through a type O the circular as primary.

secondary use N turn output to promote a electromagnetic mechanism.electromagnetic agency action is tripping.The principle is normally on the wire and zero line current flows into equal outflow.so the induction of secondary voltage is zero.when the wire wholesalemotor.blogspot.com or there's a single line to ground zero line grounding resistance or short circuit.wire and zero line current on a voltage difference.through the secondary induction.when the difference in value to a certain drive single phase asynchronous motor off the main circuit of electromagnetic institutions.At present basically has two kinds of electronic and magnetic.

How do you determine the three-phase motor U-V-W

Premise is three-phase motor,if there is no any label,see terminal,open connection guide,top left first for U1,followed by V1,W1,and then the remaining 3 size is measured with a multimeter ohms range,in turn,the same for each of the corresponding winding tail.1 the three-phase asynchronous motor U,V,W between conduction? I use a multimeter test of three-phase asynchronous motor,U,V,W three terminal,why it is connected between the two? That is between each two phase is conduction,is this normal? Whether internal short circuit? Tong is certain,regardless of the delta connection or y connection,between them are interlinked,this is normal.Delta connection of resistor is equal to two coil series again and after wholesalemotor.blogspot.com the third parallel resistor,y connection is equal to the resistance after two coils in series.2 motor three-phase winding is same or U V to W almost no resistance,but after the power supply can operate properly,what reason is this? 

Electrical single phase asynchronous motor wiring has been disconnected.You can measure the dc resistance,generally winding dc resistance is small.In ac motor winding inductance coil,then it has impedance,so when it is bubbled into alternating current will not burn.3,a motor,in the case of no electricity,U,V two phase winding resistance value is 5.4 euro,W phase for the more than 100 thousand,this shows that 5kw permanent magnet generator what is the problem? Interturn problems,may be insulation electric motors price damage,check the winding,again,such as resistance balance again electrify,right?4 "2nd level of the motor insulation resistance in general in many megohm range? Cold insulation resistance should be greater than the general motor (1000 + U) / 1000.U for the winding of the rated voltage,resistance to (mge) insulation resistance value is much bigger in practice,it is affected by temperature and humidity of the air,but also the lowest not less than 1 megohm.