Motor startup mode

Include:motor startup mode,auto voltage reducing total pressure direct start starting,y-delta

starting,soft starter,inverter.Total pressure directly starting:At both capacity and load of power

grid allows total pressure directly under the condition of starting,can consider to use the direct

starting.Advantage is that control is convenient,simple maintenance,and more economic.Mainly used in ac geared motor small power motor starting from saving energy point of view,should not be greater than 11 kw motor by this method.Auto voltage reducing starting:use autotransformer tapped the reduced pressure,can adapt to the needs of different load starting,and can get a bigger starting torque,is a kind of is often used to starting decompression of the large capacity motor starting.Its the biggest advantage is

starting torque is bigger,when the tap at 80%,starting torque can be up to 64% of direct starting.And can adjust the starting torque by tapping.Are still widely used.

Y-delta starting:for normal operation of the stator winding of delta connection of squirrel-cage asynchronous motor,if at the time of starting the stator windings into star,waiting for start to end to connect into a triangle,can reduce the starting current,to reduce its impact on the grid.Such starting way is called star triangle decompression starting,or simply the star delta starter (y - delta starter).Using star delta starter,starting current is only according to the delta connection directly when starting a third of the original.If direct starting when the starting current to 6~7 meter,ie in star triangle is

starting,the starting current is 2~2.3 gasoline generator spare parts times.This means using star delta starter,starting torque is reduced to the original starting directly based on the delta connection when a third.Suitable for the occasion of no load or light load starting.And compared with any other decompression starter,its structure is the most simple,the price is the cheapest.In addition,a further advantage of star triangle starting way,namely when the load is lighter,can let the motor run in y connection.

At this point,the rated torque and load can match,this can make the motor efficiency is improved,and save the electricity consumption.Soft starter:this is the phase shift voltage regulating principle of SCR is used to realize the regulating of the motor starting,it is mainly used for motor starting

control,starting effect Motor vehicleis good but the cost is higher.By using thyristor,thyristor harmonic interference is larger at work,have a certain influence on power grid.Additional power fluctuations will also affect the thyristor conduction,especially how thyristor devices in the same power network.So the thyristor failure rate is higher,because involving power electronic

technology,therefore,taller also to the requirement of maintenance technicians.Inverter,inverter is

the highest technical content of modern motor control field,the most complete control function,the best control effect of motor control device,it is by changing the frequency of the power grid to adjust the rotation speed and torque of the motor.Because of involving power electronic technology,computer technology,so the cost is high,too high to the requirement of maintenance technicians,mainly used in need speed and the field of high speed control requirements.

Construction machinery used in motor maintenance rules?

(1) of the motor shell must make the pledge that we shall have good grounding or zero.(2) periodically clean the machine work,purging of the compressed air,compressed air diesel generator should be clean and shall not contain water and oil content,pressure should not exceed 2~3 KGF/cm~2*1 KGF/cm~2 = 9.80665*10~4 Pa (3) the number of motor bearing grease should be stipulated by the original factory,no rules,should be combined with the working performance of the motor selection,filling quantity to be appropriate.(4) brushes,slip ring,or the processing of commutator and brush holder adjustment,must be a power outage.asynchronous motor (5) discontinued for a long acmotortrading.blogspot.com time and after the fault treatment of motor,must by the insulation test qualified,can put into operation.Insulation resistance shall meet the handover and the regulation of the preventive test electrical equipment in the single phase generator regulations.Generally high voltage ac motor stator insulation resistance should not be less than 1 M per kv ,rotor every 0.5 M kv; Low voltage of the motor stator insulation resistance should not be less than 0.5 M ,rotor should not be less than 0.15 M.

Three-phase asynchronous motor winding fault analysis and processing

Like a wrong Winding wrong cause incomplete rotating magnetic field,the start-up difficulties,imbalance of three phase current,the symptom such as large noise,serious when,if not handled in time will burn winding.Basically has the 220v ac electric motors following several ways: a very phase one or several coil embedded against or end wrong;(phase) set the;A phase windings to reverse;Multichannel parallel winding branch wrong;"Delta"and"Y"connection error.1,failure phenomenon Motor can't start,imbalance of no-load current is too large or too much,too fast or have severe vibration and temperature have a lot of noise,the phenomenon such as burn out the fuse.2,the reason Mistaking"delta"connect"Y";A three-phase winding maintenance on fore and aft by reverse;Relief boot is tap location choice not appropriate or internal wiring error;When offline,new motor winding connection error;The old motor s wrong judgment.

3.The maintenance method (1) ball.Such as the ball along the stator rotating circular surface rolling,that is correct,otherwise winding have wrong phenomenon.(2) the compass.If the winding is not wrong,is in a phase winding,the compass through adjacent pole (phase),low speed permanent magnet generator referring to the polarity should be on the contrary,in three-phase winding adjacent different phase (phase) group and the opposite;Such as polarity direction remains the same,suggesting a very (phase) reverse;If point to condemn,the group has the reverse coil.(3) the multimeter voltage method.According to the wiring diagram,if the two measuring voltmeter are no instructions,or a reading,a no readings,winding has pick up the place.(4) common and dry cell,milliammeter remanence method,motor steering method,etc.4.The processing method (1) a coil or coil set against,the no-load current have larger imbalance,repair should be carried out to the factory.(2) lead to reconnect after wrong should correctly judge fore and aft.(3) relief wrong should be controlled wiring diagram or schematic diagram,carefully proofread rewiring.(4) new motor logoff or again after winding connection

error,should be sent to factory repair.(5) of the stator windings connect the,pick up the one phase

current is particularly big,according to the characteristics of the malfunction and repair.(6)

take"Y"into"delta"type or number of turns 220v ac electric motors is not enough,the no-load

current is big,should be corrected in a timely manner.

The working principle of the permanent magnet synchronous motor

The working principle of the permanent magnet synchronous motor measurement device problem complement advantages and weaknesses: measuring equipment PM synchronous motor synchronous generator in order to realize the transformation of energy,need to have a dc magnetic field.And the direct current magnetic field,Known as the generator excitation current.According to the method of field current supply,which obtained from other 220v ac electric motorssource excitation current of the generator,called separately excited generator,excitation power from the generator itself,it is called a self-excited generators.A,power generation Machine for several kinds of mode 1,dc generator excitation current excitation power supply: this way of excitation generator has a dedicated dc generator,the dedicated dc generator,called dc exciter,generally with generator exciter Axis,generator exciting winding through perfectly on the large axial slip ring and fixed brush obtained from dc exciter current.This way of field independent excitation current,more reliable and decrease for electricity consumption,etc,is in the past few decades Main motor excitation way and has a mature operating experience.Defect is excitation regulating speed slower,maintenance workload is big,it is rarely used in more than 10 mw units.

2,ac exciter power supply mode of excitation,modern large capacity power generation Provide field current machine some use ac exciter.Ac exciter is installed on the generator shaft,its output of alternating current flows through the rectifier supply generator rotor excitation,at this point,his way of excitation of generator excitation way,and as a result of the static Check of the rectifying device,so it is also called separately excited static excitation,exchange vice exciter

excitation current.Deputy exciter communication can be permanent magnetic measuring device machine or alternator with self-excitation constant pressure device.In order to improve the excitation

regulating speed,ac excitation Magnetic machine usually USES the 100-200 hz frequency generator,vice exciter and communication,the use of the 400-500 hz frequency generator.This kind of generator and three-phase ac dc excitation winding winding around the stator slot,rotor teeth and slots not only round Group,like a gear,therefore,it has no brush and slip ring contact parts such as rotation,has

reliable operation,simple structure,convenient manufacturing process.The disadvantage is induction motor price that the noise is bigger,ac voltage harmonic component is bigger also.

3,without exciter excitation Magnetic way: in the way of excitation is not set up special exciter,and obtained from the generator itself excitation power supply,the rectifier supply again after excitation generator itself,according to static excitation self-excitation type.Static excitation self-excitation type can be divided into the shunt and the compound of two Kind of way.Since the shunt way it through joint in the export of generator excitation current of rectifier transformer,the rectifier supply generator excitation,after this way of excitation has simple knot,equipment,less investment and less maintenance workload,etc.Since after Besides no rectification transformer excitation mode,also has series high- power current transformer in generator stator loop.This is used in the case of short circuit of

transformer,provide generator excitation current,to make up for the rectifier transformer output is not The foot.This way of excitation has two kinds of 220v ac electric motors excitation source,through the voltage rectifier transformer power supply and current source through series transformer.

The working principle of motor

Motor (Motors) is a device converts electrical energy into mechanical energy.It is using electric coil (that ac electric motor is,the stator winding) to diesel generator produce a rotating magnetic field and try to turn the mouse cage form magnetoelectric dynamic rotating torque closed aluminum frame.Motor by using the power divided into dc motor and ac motor,electric power system in most of the motor is ac motor,can be synchronous motor or induction motor (motor stator magnetic speed diesel generators prices and rotor rotating speed is not synchronized rate).Motor is mainly composed of stator and rotor,the direction of motion of the wire in the magnetic field force with the direction of current and magnetic induction line in the www.dongfeng-motor.com direction of magnetic field direction.Working principle of the motor is a function of magnetic field on the current stress,to rotate the motor.

Small coal-fired power plant generator bearing general provisions?

1,during normal operation,the generator of lubricating oil inlet temperature and pressure shall be controlled according to the manufacturer.2,the side of the steam turbine generator exciter and exciter bearing,bearing should be and the casing electrical motor 12v 1000w insulating (best in between two layers of insulation pad with metal plate,in order to measure the insulation).3,when produced in the steam turbine generator rotor of high electrostatic voltage,the mother should gasoline generator spare parts be near the worm wheel on the side of the shaft grounding device brush,generally after 100~300 grounding resistance.4,on each tubing shall be installed two of the insulation flange,so that the generator runtime checking tubing insulation condition.In all tubing low speed permanent magnet generatorinstalled,the insulation of the steam turbine generator and exciter bearing resistance with 1000 v,shaking table,the measurement shall not be less than 1 m Ω.5,steam turbine generator and exciter bearing,should be made it impossible for oil splash to the coil,the slip ring and the commutator.

High-performance vector control ac speed regulating

High-performance vector control ac speed regulating system needs the support of modern control

theory,for ac motor,currently the most widely used is the "vector control scheme.Since 1971,Germany's

Siemens F.B laschke vector control principle,put forward the control scheme is popularity.Therefore,in-depth study on it.Vector control of the basic idea is:in ordinary three-phase ac motor on the simulation of the dc motor torque control law,the magnetic field orientation coordinates by the vector transformation,the three-phase ac motor stator current is decomposed into excitation current and 220v ac electric motorstorque current component,and make the two component perpendicular,independent of each other,and then adjust respectively,in order to obtain good dynamic characteristics as dc motor.So the vector control is the key of stator current amplitude and spatial location (the control of frequency and phase).Vector control is the purpose of improving torque control performance,the final implementation is to id,IQ's control.

Due to the quantity of the stator side is communication,the space vector in space to synchronous speed rotation,so isn't very convenient for adjustment,control,and computing.Need a complex coordinate transformation of vector control,and reliance on motor parameter is large,it is difficult to guarantee complete decoupling,make the control effect.3.3 direct torque control of vector control scheme is an effective ac servo motor control scheme.But because of the need of complex vector rotation transformation,and the mechanical constant is lower than the electromagnetic constants of the motor,so can't quickly response to the torque vector control.In view of the vector control of this defect,German scholar Depenbrock in the 1980 s proposed a control scheme with fast torque response characteristics,namely direct torque control (DTC).This control scheme to abandon the idea of decoupling control vector control and current feedback loop,adopt the method of stator flux,using discrete two point control of the stator flux linkage and torque of the motor directly adjusted,has simple structure,fast torque response,etc.The earliest used in induction motor DTC,1997 L Zhong and others,the modification of DTC algorithm for permanent magnet synchronous motor control,there are related to the simulation and experimental research.DTC method to realize double closed loop control of flux and torque.

After getting the flux linkage and torque of the motor values,the permanent magnet synchronous motor DTC.Figure 2 shows the permanent magnet synchronous motor DTC scheme structure diagram.It consists of permanent magnet synchronous motor,inverter,torque estimation,flux estimation and voltage vector switch table link,the ud,uq,id,IQ as static (d,q) voltage and current components in the coordinate

system.Though,the study of DTC has made great progress,but in theory and practice is not enough

mature,such as:low speed performance,load capacity,etc.,and its high real-time requirements,large amount of calculation.3.4 decoupling control of permanent magnet synchronous motor mathematical model after coordinate transformation,id,id still exist between coupling,cannot achieve the independent

regulation of id and IQ.If you want to make the permanent magnet synchronous motor to obtain good dynamic and static performance,it must solve the id,IQ of decoupling problem.If can control id

constant 0,can ac geared motor simplify the equation of state of permanent magnet synchronous motor for:at this point,the id and IQ has no coupling relation,Te = np bits of fiq,independent adjustment IQ can

realize the linearization of the torque.Decoupling control,realize id constant 0 voltage type can be

used decoupling and current mode decoupling.

The former is a completely decoupling control System solutions,can be used to id,generator stator IQ completely decoupled,but implementation is more complicated; The latter is a kind of approximate decoupling control scheme,the control principle is:select appropriate id ring current regulator parameters,make its have considerable gain,and always make the controller of the reference input command id * = O,id available material id * = 0,IQ material IQ * O,thus to obtain the approximate decoupling of permanent magnet synchronous motor.Figure 3 shows based on vector control and id * = O decoupling control of permanent magnet synchronous motor speed control system block diagram.Although current mode decoupling control scheme can't completely decoupled,but is still an effective control method,as long as take the better way to handle it,also can www.facebook.com/guohong.trading get high accuracy of torque control.Therefore,to use the current engineering type more of decoupling control scheme.Current mode decoupling control,however,can only achieve the rotational speed of motor current and static decoupling,if the dynamic coupling will influence the control accuracy of the motor.In addition,current mode decoupling control by making the coupling of a remains the same,will introduce a lagging power factor.

Structure and working principle of the generator is what?

Generators are usually made of stator and rotor,end cover and bearing

www.facebook.com/guohong.trading components.By the stator core,stator line

winding,stand and fixed the parts of other structures.Rotor by the rotor core (or a magnetic pole,the

conjugate) 220v electric motor winding,retaining rings,central ring,slip ring,fan and shaft parts.The generator rotor rotate by the prime mover,when direct current (dc) after the rotor winding for carbon brush and slip ring access,rotor can produce magnetic fields.Due to the rotor is constantly perkins diesel generator rotating,so the diesel generator magnetic field is a rotating magnetic field,it and the relative motion is formed between the stillness of the stator winding,equivalent to the stator winding in constant cutting lines,and will in the stator winding induction electromotive force.The direction of the induced electromotive force of the stator,is decided by the right-hand rule.For Ren Yigen of coil wire,in the process of the rotation of the rotor,sometimes N pole toward it,S very on it,sometimes different

polarity in the winding induction electric potential orientation is not the same.Back and forth

direction change,this is an alternating current.

The cause of the three-phase asynchronous motor can't start

1),2) didn't plug in,blown fuse 3),4) circuit,stator winding of the stator or rotor winding grounding

5),and stator winding short circuit 6),7) of the stator winding wiring error,overload acmotortrading.blogspot.com or mechanical transmission was crushed loose article 8),the rotor copper 9),no oil in the bearing,axis due to heat expansion,obstruction in the bearing rotating 10) wrong wiring,control equipment or damage to the 11),over-current relay size 12),old starting switch oil cup of gasoline generator spare parts oil,13),wound rotor type motor starting operation error 14),wound rotor type motor rotor resistance with 15),bearing damage Three-phase asynchronous motor can't start many factors,a detailed analysis should be done according to Motor vehicleac tual condition and symptoms,carefully check,can't get to start for many times,especially when the starter motor when abnormal noise or overheating,should immediately cut off the power supply,after find out the reason and rule out any 220v ac electric motors starting,in case of failure to expand.

Frequency conversion air conditioning really save electricity?

First,the frequency conversion air conditioning really save electricity,frequency conversion air

conditioning energy saving principle 1.The principle of frequency conversion air conditioning is air conditioning adopted more advanced 220v ac electric motor stechnology,the startup voltage is small,but under the condition of low voltage and low temperature start,that www.dongfeng-motor.com in some areas due to the low voltage instability or winter indoor temperature and air conditioning,it is hard to start a certain improvement effect.Due to realize the stepless variable speed compressor,it can also adapt to more widespread refrigeration and heating demand.2.Simply put on the principle of frequency conversion air conditioning is in the structure of conventional permanent magnet motors for saleair conditioning increased by a frequency converter.

The heart of the air conditioning compressor,its speed directly affects the efficiency of the use of air

conditioning,frequency conversion air conditioning inverter is used to control and adjust the

compressor speed control system,make it always in the best state of rotational speed,thus,improve the

energy efficiency ratio is larger than that of conventional air conditioning energy saving 20% ~

30%.Second,the frequency conversion air conditioning really save electricity,high frequency operation

more efficient 1.The frequency conversion air conditioning in addition to just boot with high

frequency operation,other operating at low frequency,most of the time consumed power is far less than the air conditioning that decide frequency.Compressor is Motor vehicle a large energy consumption of air conditioning,its rated output accounted for about 90% of the air conditioning machine power,the other 10% for fan motor and other electric parts;The frequency conversion air conditioning compressor

efficiency is higher than the ordinary air conditioning that decide frequency compressor.2.The number of frequency conversion air conditioning open stop is much lower than that of the air conditioning that decide frequency switching frequency,the air conditioning that decide frequency boot will consume a lot of energy.Ac frequency conversion air conditioning than the air conditioning that decide frequency to save electricity by 30%,while dc frequency conversion air conditioning power saving 50%.

The main structure of a generator?

Generators are usually made of stator and rotor,end cover and bearing components.By the stator core,stator line winding,stand electric motors price and 220v electric motorfixed the parts of other structures.Rotor by the rotor core (or a magnetic pole,the conjugate) winding,12v motor retaining

rings,acmotortrading.blogspot.com central ring,slip ring,fan and shaft parts.By bearing and end cover of generator stator and rotor connected together,can make the rotor spinning in the stator,do the exercise cutting lines,thus induced potential,through terminal lead,in the circuit,the electric current is produced.

Town drainage pumping station motor running inspection rules?

(1) should be kept clean,can not have electric motor parts water droplets,oil into the motor;(2) the operation current and voltage should not be more than ratings;(3) check the bearing heating,oil,magnet prices and so on and so forth;(4) the motor acmotortrading.blogspot.com temperature rise shall not exceed allowable values;(5) the motor in operation should not have scratches and other noise;(6) for wound rotor motor,should check therotor and stator brush and slip ring of abrasion of contact;(7) motor ventilation should be good;(8) motor steering should be correct;(9) of wound rotor motor short circuit contactor should be in a short position.

Only a winding motor,rotor cage type

When a single-phase sinusoidal current in the stator winding,the motor can produce an alternating magnetic field,the magnetic field strength and direction interplanting sine law of change at any time,but is fixed on the spatial orientation,say again so the magnetic field is alternation pulse magnetic field.This alternation pulse magnetic field can be decomposed into two at the same speed and direction of rotation are instead of a rotating magnetic field,when the rotor static,the two rotating magnetic field generated in the rotor torque of two equal and opposite,making synthetic torque is zero,so the motor can't rotate.When we use the motor rotates in the direction of a force (clockwise),then the rotation of the rotor and clockwise direction magnetic field between the cutting lines of magnetic force movement decreases;The rotation of the rotor and counterclockwise direction magnetic field cutting lines of magnetic force between the movement.This balance is broken,the total electromagnetic torque generated by the rotor will no longer be zero,rotor spun along the driving direction.

To make single-phase electric function automatically spin,we can add a starter in the stator winding,starting with the main windings in space by 90 degrees,starting winding to generator rotor and stator concatenate a suitable capacitance,makes differ with approximation in the phase of the primary winding current 90 degrees,the so-called split-phase principle.These two differ 90 degrees of electricity flow in time into the two differ 90 degrees of winding on the space,will be produced in the space (two-phase) rotating magnetic field,under the effect of the rotating magnetic field,the rotor can be automatic starting,after starting,to speed up to a certain,with the aid of an installed on the rotor of the centrifugal switch or other automatic control device will start winding broken,only main winding work in normal working conditions.Therefore,starting winding can make short work.But there are a lot of time,starting winding is not broken,we call this kind of motor capacitor,single-phase motor to change this kind of motor,can be achieved by changing the position of the capacitor is concatenated.In single phase motor,the rotating magnetic field generated another method called shield electrode method,also known as single phase mask pole type motor.This made salient pole motor stator,which has two kinds of the poles and quadrupole.Each pole in a third - quarter pole face open place with full of small tank,the pole is divided into two parts,on the small part of the suit on a short circuit copper ring,like pole to cover up this part,so called cover pole type motor.

Single-phase winding set in the entire history of the magnetic poles,each pole of the coil is connected in series,the connection must make its polarity,in turn,according to the N,S,N,S arrangement.When the stator winding current,the magnetic pole of the main magnetic flux,according to lenz's law,which through the short circuit copper ring main magnetic flux on the copper ring on a phase lag is only one winding

single-phase ac motor,the rotor's cage.When a single-phase sinusoidal current in the stator winding,the motor can produce an alternating magnetic field,the magnetic field strength and direction interplanting sine law of change at any time,but is fixed on the spatial orientation,say again so the magnetic field is alternation pulse magnetic field.This alternation pulse magnetic field can be

decomposed into two at the same speed and direction of rotation are instead of a rotating magnetic

field,when the rotor static,the two rotating magnetic field generated in the rotor torque of two

equal and opposite,making synthetic torque is zero,so the motor can't rotate.

When we use the motor rotates in the direction of a force (clockwise),then the rotation of the rotor and clockwise direction magnetic field between the cutting lines of magnetic force movement decreases;The rotation of the rotor and counterclockwise direction magnetic field cutting lines of magnetic force between the movement.This balance is broken,the total electromagnetic torque generated by the rotor will no longer be zero,rotor spun along the driving direction.To make single-phase electric function automatically spin,we can decide on Adding a starting winding son,starting with the main windings in space by 90 degrees,starting winding to concatenate a suitable capacitance,makes differ with on the phase of the primary winding current approximate 90 degrees,the so-called split-phase principle.These two differ 90 degrees of electricity flow in time into the two differ pumps 90 degrees of winding on the space,will be produced in the space (two-phase) rotating magnetic field,under the effect of the rotating magnetic field,the rotor can be automatic starting,after starting,to speed up to a certain,with the aid of an installed on the rotor of the centrifugal switch or other automatic control device will start winding broken,only main winding work in normal working conditions.

Therefore,starting winding can make short work.But there are a lot of time,starting winding is not broken,we call this kind of motor capacitor,single-phase motor to change this kind of motor,can be achieved by changing the position of the capacitor is concatenated.In single phase motor,the rotating magnetic field generated another method called shield electrode method,also known as single phase mask pole type motor.This made salient pole motor stator,which has two kinds of the poles and quadrupole.Each pole in a third - quarter pole face open place with full electricalmotor1.blogspot.com of small tank,the pole is divided into two parts,on the small part of the suit on a short circuit copper ring,like pole to cover up this part,so called cover pole type motor.Single-phase winding set in the entire history of the magnetic poles,each pole of the coil is connected in series,the connection must make its polarity,in turn,according to the N,S,N,S arrangement.When the stator winding current,the magnetic pole of the main magnetic flux,according to lenz's law,which through the short circuit copper ring main magnetic flux to produce a in the copper ring on the phase lag

Stanley portable power station

A lot of size is smaller than air compressor power station,there is only one trolley so big,can drive

the efficient tool.For example,we a GT18 hydraulic power station to drive samples of all the

tools,from the 90 # hydraulic drill picks wholesalemotor.blogspot.com to small. Our hydraulic power station using the latest technology of the engine manufacturer.Use air-cooled engine,high combustion efficiency,light weight,strong and durable,its produce power to drive the cause of most of our tools,and acmotortrading.blogspot.com engine load.Hydraulic

power station look for air and also or internal combustion is a tool perkins diesel generator

sethas the following characteristics. 1.Diversity: we have more than 50 types of tools you

can use this power station 2.perkins diesel generator set Air cooling: not freeze in

winter 3.High efficiency: 1 disappeared 4 litres of fuel consumption 4.Low noise 5.Light weight: 150

kg 6.Size: can be put into small truck or train 7.Portability: can work in the field to the mobile

trolley 8.Convenient maintenance: can the dealer maintenance engine

The motor efficiency field test method research

This puts forward new problems to us,whether the field test of the various losses and efficiency of

motor,determine whether the motor is unqualified,in use three-phase asynchronous motor for an online "check-up",eliminate the unqualified motor.It is very important for energy saving work,the author is to solve the problem and research work.Motor field test method research The optimal load rate of the electric vehicle motor motor is equal to the best state of actual output power and the ratio of the rated power.When its value is greater than 70%,the motor efficiency and power factor are in the best running status.If you can avoid the motor light load operation for a long time,can achieve the purpose of www.dongfeng-motor.com energy saving.Motor efficiency highest state is running,select the best load factor is particularly important.Because of the unqualified The motor is more,more electricity phenomenon is very serious.Machine mining system power consumption accounts for about a third of production plant is the total power consumption,so the machine mining system is an important aspect of saving energy and reducing consumption.

In the face of pumping unit motor use present situation,the management of the oil field and power saving work encountered great difficulties.In the quality of the motor Good or bad can not only see use fixed number of year.Repaired the motor quality is good,quality is poor,and even some energy-saving

motor not energy-saving. The shengli oilfield GuDong production machine mining system at the

ac synchronous motor scene of the use efficiency of pumping unit motor test method research 1820 units,450 units of energy-saving motor,accounting for 24.73% of the total production in the motor,1370 sets of ordinary motor,accounting for 75.27% of the total production in the motor.Production plant in motor aging phenomenon is more serious,the average energy-saving motor Use fixed number of year of 3.2 a,ordinary motor average age is 4.4 a,46.2% of the motor after repair,maintenance of 3 or more times a motor proportion reaches 18.2%,the proportion is on the high side.Compared with GuDong production plant and other production plant is the motor of the same,generally have a mixture of old and new,models and more complex,aging phenomenon such as serious.

What is a motorized spindle

Motorized spindle is appeared in recent years in the field of nc machine tool spindle and the spindle

motor with new technology,it with the linear motor technology,high speed cutting tool technology,it

will put into a new era in high speed machining.Motorized spindle is a set of components,it includes

motorized spindle itself and acmotortrading.blogspot.com its accessories: motorized spindle,high frequency inverter device,oil mist lubrication,cooling device,the built-in encoder,changing tool device. The fusion electric spindle technology: High-speed bearing technology: electric spindle usually adopt composite ceramic bearings,wear-resistant heat-resistant,life expectancy is a traditional bearing several times;Sometimes also by electric or magnetic levitating bearing static pressure bearing,inside and outside the circle does not contact,theoretically infinite life;Technology: high speed motor motorized spindle is the product of motor and spindle fuses in together,the rotor of the motor is the rotation of the spindle parts,theoretically the motorized spindle can be regarded as a high speed motor.

Key technology is under the high speed dynamic balance;Lubrication: motorized spindle quantity and lubricating timing commonly used lubricating oil and gas;Also can use grease,but the corresponding rate to discount.The so-called timing,is every certain time interval note oil at a time.The so-called quantitative,is through a device called proportional valve,precise control of lubricant oil at a time.And oil and gas lubrication,refers to the lubricating oil in the compressed air to carry,was blown into the ceramic pumps bearing.Oil control is important,too little,no lubrication;Too much,when bearing at high speed for oil and heat resistance.Cooling device: as soon as possible in order to speed motorized spindle heat dissipation,usually on the walls of the motorized spindle with circulation cooling agent,the effect of cooling device is to keep the temperature of the coolant. Built-in pulse generator rotor and stator encoder: rigid tapping screw,in order to realize the automatic tool change and motorized spindle built-in pulse encoder,in order to realize the accurate phase Angle control and feed.