Practical knowledge of electrical engineering

 Three-phase 3 phase induction motor five wire with color yellow, green, red, light blue, respectively the U, V, W, N protective earthing line double color (PE) transformer in operation, each transformer phase current should not exceed electric motor rated current; The maximum unbalance current shall not exceed 25% of the rated rotor current. Transformer operation should be performed periodically maintenance. The same transformer power supply system, unsuitable mixed protective earthing and protection by zero. The voltage transformer secondary coil normally rated voltage 100 v. Secondary side of voltage permanent magnet generator transformer at work may not be rotor and stator short circuit. Due to short circuit will produce a lot acmotor2.blogspot.com of short circuit current, may burn out diesel generator set transformer, voltage transformer for this time, secondary side are installed fuse protection. Secondary side of voltage transformer must be grounded at one end. This is to prevent the secondary synchronous generator coil insulation breakdown, a high pressure into the secondary small diesel engine side, endanger the safety of person and equipment. Current transformer secondary side close to the short circuit conditions at work. Rated current of the secondary coil is commonly 5 a current transformer secondary side is not electric generator allowed to open at work, current transformer secondary side generator must be grounded at one end, to prevent the first and second coil insulation breakdown, the side of a high voltage into the secondary side.

Three permanent magnet ac servo motor

 3 Phase induction Electrical Motor MS Series for winding machine

Specifications
ambient temperature:-15 -40 
above sea level : not exceed 1000m 
rated voltage:+-5% 
A - B (ALLEN - BRADLEY) companies in the United States to drive the division production type 1326 ferrite permanent magnet water pump ac servo motor and 1391 type ac PWM diesel engine servo controller. Motor including three stand diesel generator number, a Water pump total of 30 specifications. I.D. (Industrial Drives) is a famous American Industrial drive arm of cole (Kollmorgen) Morgan had production of BR - 210, BR - 310, three series, a total of 41 BR - 510 specifications of the brushless servo motor and BDS3 type servo Drives. Since 1989, launched a new series design auto spare parts of mixed Jian stolen deity (Goldline) permanent magnet ac servo motor, including B (small inertia), M (inertia) and EB (explosion-proof) three categories, there are 10, 20, 40, 60, 80 five stand, each categories has 42 specifications, are all made of ndfeb permanent magnet materials, range of 0.84 ~ 0.84 N.m torque, power range of www.dongfeng-motor.com 0.54 ~ 15.7 kW. 


iron motor shell motor parts pig casting iron 
Specifications
1.iron or steel 
2.sand casting 
3.ISO,UL,FM,LPCB,VDS,TS16949 
4.timely delivery 

5.reasonable price 
Form a complete set of drives have BDS4 (simulation), BDS5 (digital model, including position control) and Smart single phase induction motor Drive type (digital) three series, 55 a maximum continuous current. Goldline series represents a new level of modern permanent magnet ac servo technology. Ireland originally Inland Kollmorgen abroad a division, is now incorporated into the AEG, ac synchronous generator to produce dc servo motor, dc torque motor and servo amplifier is known. Production BHT1100, 2200, 3300, three stand, a total of 17 kinds of specifications of the SmCo permanent magnet ac servo motor and eight kinds of controllers. French Alsthom group alternator generator in Paris Parvex factory LC series (long) and GC series (short) ac servo motor, a total of 14 specifications, and production AXODYN series drives.

Servo motor type selection calculation method

CCC CE ROHS UL VDE Certification and 115/120 V AC Voltage 220V&120V induction motor

Specifications
1. Specifications1.3-phase asynchronous motors 
2. IEC standard 
3. OEM 
4. Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
The 3 phase motor 3 phase induction motor confirmation of a, rotational speed and the encoder resolution. Second, the motor shaft load torque conversion and deceleration torque generator calculation. Third, electric water pump the computational load inertia, moment of 3 phase induction motor inertia of the match, yaskawa servo motor as an example, the partial products of inertia matching up to 50 times, but actually as small acmotor2.blogspot.com as possible, so good for precision and response speed. Four, regeneration of resistance calculation and selection, for servo, generally more than 2 kw, outside to ac synchronous generator configuration. Twisted-pair cable shielding five, cable selection, encoder, absolute value encoder diesel engine magnetic generator for yaskawa servo plot of products is 6 core, incremental is four core.

Wire and cable fault judgment

ac three phase asynchronous electric motor stator 
Specifications
1. 20 years manufacturing experience 

2. competitive price,high quality
1, the damage of rectifier module: water pump price is usually caused by power grid voltage three phase induction motor or internal short circuit. Under the condition of eliminate internal diesel engine short circuit, replace the rectifier bridge. generator price At the scene to deal with failure, verify the user should focus on power grid, such as power grid voltage, whether of power grid Water pump pollution equipment such as electric welding ac synchronous generator machine, etc. 2, the inverter module damage: general is caused by motor or cable damage and drive circuit fault. After repair of drive circuit, good condition, the measured waveform change module. After replacement driver board in the on-site service, but also must pay attention to check the motor and connecting cable. ac synchronous generator Without any fault is decided, the operating frequency converter. 


MS160 Electrical Induction Motor
Specifications
MS160 Electrical Induction Motor 
1.100% Copper Wire 
2.Voltage Tolerance 5% 
3.Aluminum , CE, ISO9001 

4.Factory Promotion IE2 
3, the electricity no display, usually due to damage or soft charging circuit switch power supply damage caused no dc dc, such as starting resistance is damaged, it is possible that the panel damage. 4, after power on display over voltage or under voltage: general due to the input phase, be affected with damp be affected with damp circuit aging and circuit boards. Find out the voltage detection circuit acmotortrading.blogspot.com and check points, to replace the damaged parts. 5, after power on display over current or grounding short circuit is generally due to the damage of electric current squirrel cage induction motor detection circuit. And such as hall element. 6, start, display overcurrent: is usually caused by inverter module drive circuit or damaged.

How to visually distinguish between ac and dc motor?

motor Lamination ac motor blender parts 
Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 

5.stunning performance 
Look from the other end of the motor output shaft, a blade is ac motor, can see the commutator (or see 3 phase ac auto parts induction motor commutator and carbon brush dc motor. If told two motors as big power, small volume of ac motor. Generally it is. Don't look at brand dc and ac motor is to judge? Can only see the inside of the motor acmotor2.blogspot.com terminal block wiring board, from Induction motor below strips can tell, is the dc and ac motor.

No spark machine

 AC fan cooling motor fan cover 
Specifications
1. Customised 
2. good quality 
3. Surface treatment: Galvanize 
4. Type: Motor Cover 
Refers to the normal operation condition, not lit around the explosive mixture, and generally will not happen again light the motor fault. Compared with increased safety type motor, in electric fan motor addition to the insulation dielectric strength test voltage, winding temperature rise, te (at ambient temperature reached highest rated running after the final temperature of ac winding, since started by starting current meter to temperature rise to the limit of time) and starting current than not Single phase motor like increased safety type has special provisions, and other aspects to add safety type magnet generator motor design requirements.

Current transformer, transformer principle

Totally Enclosed Protect Feature and Three-phase Phase low rpm ac electric motor
Specifications
Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
Large and small current in the power supply electric circuit voltage difference from several to tens of thousands of AnDouYou Ann. For convenience of secondary instrument measuring need into a more uniform current, in addition line voltage is high, such as direct measurement is very dangerous. Current transformer is current 3 phase ac induction motor transformer and electrical isolation effect. Earlier, most of display instrument is a pointer type current meter, so the current transformer secondary level most of the electric current is the ampere (e.g., 5 a, etc.). Now wholesalemotor.blogspot.com most of the power measurement, digital and computer sampling signal is commonly milliamperes (0 to 5 v, 4-20 ma, etc.). Micro ct (current transformer) secondary current as milliamperes, between the main transformer and sampling. Micro current transformer has also been called "instrument use current transformer". (the instrument with a current transformer with a layer of meaning is using more current than Induction motor the precision of the current transformer in the laboratory, is generally used electric motor in expanding instrument range.)

Research on the positioning control of asynchronous motor - fuzzy controller

 (1) to determine the fuzzy controller input variables and output variables (2) design control rules of fuzzy controller (3) establish the blurred with the fuzzy method (4) select the fuzzy controller input variable and output variable in the theory field and determine the parameters of the fuzzy controller (quantitative factor and scaling factor) (5) the preparation of the application of fuzzy control algorithm (6) the rational selection of sampling time fuzzy control algorithm electric vehicle motor Generally use a two-dimensional fuzzy controller to the change of the error and error as input variables, to control the change of the quantity of output. The design of the fuzzy control rules generally includes: choose the word set of input/output variables, define a fuzzy variable fuzzy subsets and establish the control rules of fuzzy controller. The word set input and output variables, as a general rule, be {NB, NM, NS, NO, PO, PS, PM, PB}. Fuzzy variables of the fuzzy subset is to determine the shape of membership function of fuzzy ac electric motor subset. General use normal distribution. 

Control rules available conditional statements describe, that is, If A and B, Then C, Then control rules table is established. Blur is the accurate quantity into fuzzy quantity, can use formula: Y = 12 X (a + b) / 2 / (b - a) accurate quantity is the actual range [a, b]. The output of the fuzzy control is a fuzzy quantity, it cannot directly control the controlled object, needs to be converted into precise volume. There are three methods: (1) selection of maximum membership degree method. The method is simple, less but the use of information; (2) take the median method; (3) the weighted average decision method, the use of information, but the large amount of calculation. Controller of the control algorithm can be written as if E = A (I) then EC = B (j) then U = C (ij) (I = 1, 2, 3,... m; j = 1, 2, 3,..., n) based on the sampling error, error change, can calculate the corresponding control quantity changes, to all the X, Y all the elements in the entire portfolio to calculate the corresponding control quantity change, U can be written as matrix (ij) (n * m) will be made table electricalmotor1.blogspot.com matrix, as A lookup table, to be stored in memory. After the real-time control, based on the fuzzy quantitative error value and error changes of look-up table directly, then set the scaling factor can be as the output to control the controlled object.

The electric auxiliary heat

Electric auxiliary refers to the PTC electrical auxiliary air conditioning hot technology. PTC ceramic is a kind of semiconductor fever, when the outside temperature is reduced, PTC resistance is less, calorific value generator set will increase accordingly. According to this principle, the use of air conditioning of PTC electric auxiliary heating technology, automatically according to the change of room temperature and the size of the indoor machine air volume and change the calorific value, so as to properly adjust indoor temperature, achieve the goal of quick, strong heating. In general, the cold weather will seriously affect the normal air conditioning refrigeration and heating function, and with the function of electric auxiliary heat air conditioning, due to small diesel generator the regulation of electric auxiliary heat to the air conditioning heat, supporting role, is very good to overcome this defect, very suitable for cold region.

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.

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.

Brushless motor and brush motor

Brushless dc motor is composed of main body of the motor and drive, is a typical mechatronics product. The stator winding of the motor to make more balanced three-phase y connection, with three phase asynchronous motor is very similar. On the rotor of the motor with the magnetization of the permanent magnet has, in order to detect the polarity of the motor rotor, inside the motor is equipped with position sensor. Drive consists of power electronic devices and integrated circuit, its function is: accept the motor start, stop, brake signal, to control the motor start, stop, and the brake; Accept the position sensor signals and positive &negative, used to control the inverter bridge on and off of each power tube produce continuous torque; Accept the speed instruction and speed feedback signal, which is used to control and adjust the speed;ac motor electric 65kw To provide protection and display, and so on. Because of brushless dc motor based on self-control type operation, so don't like frequency control of motor speed synchronous motor overload start under plus startup winding on the rotor, also won't generate oscillation and step out when load mutation. Medium and small capacity of the permanent magnet brushless dc motor (BLDCM), now more than using high magnetic energy product of rare earth ndfeb material (Nd - Fe - B). As a result, the volume of rare earth permanent magnet brushless motor than three-phase asynchronous motor with capacity reduces a frame number. 

Nearly 30 years study of asynchronous motor frequency control of motor speed, in the final analysis is looking for a way to control the asynchronous motor torque, rare earth permanent magnet brushless dc motor is bound to its wide speed range, small volume, high efficiency and steady speed and small error characteristics appeared in the field of speed advantage. For brushless dc motor has the characteristics of a dc motor, is also the device of frequency variation, so also known as dc frequency conversion, the international general term for BLDC) motors running efficiency of the brushless dc motor, torque at low speed, precision of speed is more good than any of the control technology of inverter, so the industry concern. This product has production more than 55 kw, can design to 400 kw, can meet the requirements of industry energy saving and high performance drive. 1, fully replace the dc motor speed control, comprehensive alternative, comprehensive alternative to asynchronous motor frequency converter + frequency conversion motor + reducer speed; 2, can run for high power at low speed, can save the reducer direct drive big load; www.dongfeng-motor.com 3, have all the advantages of traditional dc motor, and cancelled the carbon brush and slip ring structure; 4, torque characteristic is excellent, medium and low speed torque performance is good, big start torque, small starting current; 5, stepless speed regulation, wide speed range, strong overload capacity; 6, small volume, light weight, large output; 7, soft and soft stop, good braking performance, saves the original mechanical braking or electromagnetic braking device; 8, high efficiency, no excitation loss and carbon brush motor itself loss, eliminate the multiple reduction consumption, comprehensive energy-saving rate can reach 20% ~ 60%, power saving a year only recover the purchase cost; 9, high reliability, good stability and strong adaptability, simple maintenance and maintenance; 10, turbulence shock resistance, low noise, little vibration, smooth operation, long service life; 

11, no radio interference, does not produce sparks, especially asynchronous motor suitable for explosive place, explosion-proof type; 12, according to the needs of optional trapezoidal wave motor and is XuanBo magnetic field magnetic field. Matters needing attention (1) before disassembly, with compressed air blowing off the motor surface dust, and wipe the surface dirt thoroughly. (2) choose the disintegration of the motor working place, clean up the scene environment. (3) familiar with the motor structure characteristics and maintenance technical requirements. (4) ready to collapse the required tools and equipment (including special tools). (5) in order to further understand the defects of the motor running, conditional can before disassembly when doing an inspection test. For this, turn motor with load test, the detailed check parts, such as temperature, sound, vibration motor, and test the voltage, current, speed, etc., and then disconnect the load, do a no-load check test, no-load loss and no-load current is measured and recorded. (6) to cut off the power supply, dismantling motor wiring, recorded. (7) the appropriate voltage test motor insulation resistance by megger are. Maintenance in order to keep pace with The Times when measured insulation resistance compared to determine the motor insulation change trend and insulating state, should be measured under different temperature insulation resistance value of the conversion to the same temperature, the average conversion to 75 ℃. Absorb than K (8) test. When the absorption ratio greater than 1.33, which indicates that the motor insulation or degree of be affected with damp be affected with damp be affected with damp be affected with damp or not serious. In order to compare with previous data, also want to add any temperature measured absorption than the conversion to the same temperature.

The main technical points of the permanent magnet generator

1 magnetic circuit structure and the design calculation. The biggest difference between permanent

magnet generator and electrical excitation generator excitation magnetic field is that it is produced

by the permanent magnet. In permanent magnet motor is a magnetic source, and part of the magnetic

circuit. Magnetism of permanent magnet can not only associated with the manufacturing perkins diesel generator process of production, and also the shape and size of the permanent magnet, the magnetization machine capacity and the magnetization method, the specific performance data discreteness is very big. In motor and permanent magnet flux and provided by the magnetomotive force also varies with the magnetic circuit of the rest of the material performance, size and motor running state. In addition, the magnetic circuit structure of the permanent magnet generator is varied, leakage magnetic circuit is very complicated and the share of magnetic flux leakage is bigger. Part of the ferromagnetic materials and is easier to saturation, permeability is nonlinear. These have increased the complexity of the permanent magnet generator electromagnetic calculation, the accuracy of the calculation results under electrical excitation generator. Therefore, it is necessary to establish new design concept, to

improve the magnetic circuit structure and control system and analyze; Must be applied in modern

design method, the new methods of analysis and calculation, improve the accuracy of design

calculation; Must study the advanced test method and manufacturing process. 2 control problem. After

the permanent magnet generator is made electricalmotor1.blogspot.com without external energy can maintain its magnetic field, but also from external regulation, control of its magnetic field is extremely difficult. These make the application range is limited by the permanent magnet generator. 

But as MOSFET and IGBT power electronic devices such as the rapid development of control technology, can not control the magnetic field in the application of permanent magnet generator and motor output control, only when the design needs to be ndfeb material, three new power electronic devices and computer control technology, the permanent magnet generator run under new conditions. 3 irreversible demagnetization problem. If the design or improper use, the permanent magnet generator in high (ndfeb permanent magnet) or low (ferrite permanent magnet) temperature, under the effects of the armature reaction current impulse, or in severe mechanical vibration that may produce irreversible retreat (or called excitation-loss), reduce the motor performance, can't even use. Thus both the research and development is suitable for motor manufacturers use inspection of the permanent magnet material thermal stability of the method and device, and to analyze the structure of various forms of resistance to electric fan motor parts demagnetization ability, in order to make the design and manufacturing, to ensure permanent magnet generator with magnetic.4 cost problem. Because of the rare earth permanent magnet materials, the price is more expensive,the cost of rare earth permanent magnet generator generally higher than the electrical excitation generator, the need to use its high performance and operating cost savings to compensate. When the design should not only according to the requirements of specific use situation, performance, price comparison to choose, and must carry on the structure of the process of innovation and design optimization in order to reduce costs.

ML series double capacitors 1 phase induction motor

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