Master electrical troubleshooting method 2

ac three phase asynchronous electric motor stator 

Specifications
1. 20 years manufacturing experience 

2. competitive price,high quality 
Faults exclusion is an important work of maintenance personnel, to eliminate the fault, must know the cause of the failure, more important is can theoretically analysis, solve the fault occurred, should have certain professional theory knowledge, to master the methods of troubleshooting. (a) current test method: test method is usually in the measurement circuit current conformed to the normal, a method to determine the cause of the electrical motor 12v 1000w problem. For low voltage circuit, often use the ammeter or multimeter current file concatenated in circuit to measure; For high voltage circuit, often using clip-on ammeter test. (2) the instrument test method: with the aid of all kinds of instruments to measure ac electric motor various parameters, such as using oscilloscope to observe the waveform and the change of the parameters, in order to analysis the cause of the failure, much used in low voltage circuit. 


Y2 series 0.75kW (1HP) AC Motor for Speed Control
Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration 
(3) the conventional method: rely on human sense organs (such as: some burning in the electrical equipment in use, the smell of burnt food lighter, discharge phenomenon, etc.) and with the aid of ~ simple instruments (e.g. multimeter) to find the cause of the problem. This method is the most commonly used in maintenance, is also used in the first place. (4) to replace the original accessories: in doubt a device or circuit board is faulty, but not sure, and there are alternative parts, alternative test, to see whether the fault disappear, returned to normal. (5) electricalmotor1.blogspot.com direct method: to understand in the cause of the problem or according to the experience, judge the location of the failure, can be directly check suspect point of failure.

The basic composition of SPC telephone exchanges

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 
The main task of the SPC telephone exchanges is single phase motor to realize the user calls in between. Basic is divided into two parts: words road equipment and control equipment. Speech path equipment mainly include all kinds of interface circuit and trunk line interface circuit (such as user interface, electric motor price etc.) and exchange (or in) network; Control equipment mainly includes the marker in the crossbar switch and register, and in program-controlled switches, control equipment for the electronic computer, including the central processing unit (CPU), memory Three phase motor and input/output devices. PBX is essentially USES the computer to the stored program control switches, it will be all kinds of control functions and method of forming procedure, deposited in the memory, use the external state of scan data and stored procedures to control, management work of the entire exchange system.

The difference between motor and brushless motors

From now in general use in the industry,there are two main types of motor:efficient rare earth permanent magnet has a motor and the efficient rare earth permanent magnet brushless motor on the market at present most Electric bicycle is still stay in brush motor stage.A brush motor using mechanical commutation,the technical requirements of the control system is low,relative cost is lower than the brushless motor,A brush motor starting torque slightly larger than the brushless motor. But
the fatal weakness is:life is short,large noise and low efficiency.Long-term use of carbon brush wear serious,it is easy to damage.At the same time wear produced huge amounts of carbon dust,These dust fall in gear oil,gear oil accelerate dries up,the motor noise further increased.A brush motor use to within a year or so will need to replace carbon brush,You will find a charge mileage bought less than two-thirds,and climbing when power is insufficient,will burn out the controller.This is because the motor After the replacement of carbon brush and commutator also be ground out a groove,reduce carbon brush contact area,poor contact of carbon brush after electrify which sparks and accelerate oxidation in electricalmotor1.blogspot.com To implement and copper,acmotortrading.blogspot.com lead to the undesirable phenomenon.

Brushless motor electronic commutation replace the mechanical commutation,technically superior to brush motor.Because of brushless motor without gear or gear,the motor,reduce wear and tear The unreliability.Its efficiency within a certain range of current ratio has a brush motor with high efficiency.Brushless motor driving up almost no motor lamination noise,and for up to 10 years to life On.According to the comparison,both brushless motor is better than have a brush.At present,there have been some electric bicycle factory with motor is to switch to the original brushless electric Machine.Brushless motor must be the development direction of electric bicycle. Consumers can come up from appearance to identify motor belongs to "brush" or "no brush" :first,"brushless electric wire" eight root,and the "brush" electric wire to the positive and negative There are two root;Secondly,with the induction motor hand when the drive motor,before and after the brushless motor rotation is easy,and before the "brush" motors turn easily,after when transfer is quite tight.

The machine after the installation commissioning,if found e.numerical,vibration more than should which to play?

(1),the rotor balance not nuclear good;(2),rotor balance quickly loose;(3),a shaft bending deformation;(4),the coupling center not nuclear is;(5),bottom screw loose;6,installation foundation uneven or solid.(1),magnet prices grease brand not appropriate;(2),grease quality is not good or bad;(3),grease in the bearing chamber,too little or too much;(4),grease with sundry; (5),the rotation part and stationary part;6,bearing inner ring or outer ring;All landowners,bearing
type is wrong,or the electric motors 12 volt quality is bad;Today,of the coupling;Pet-name ruby,belt pull too tight;

Attending,motor vibration is too large.Motor rotor in the process of production,due to the influence of various factors (such as uneven material casting porosity and shrinkage cavity,parts of the weight of ac electric motors error and machining error,etc.) will cause the imbalance of rotor in weight,so the rotor in the assembly after the completion of the school to balance.More than six pole or rated speed is 1000 RPM the motor and motor) under its rotor can be only static balance,balance the other motor www.facebook.com/dongfeng.motor rotor to the school.

General electrical engineer to summarize the influence of frequency converter for motor

1 the efficiency of the motor and the problem of temperature rise In either in the form of a frequency converter, both in the operation of the different degree of harmonic voltage and current, make the motor in non-sinusoidal voltage, power flow operation. At the current widespread use of sine wave type PWM inverter as an example, the basic is zero, the low-order harmonic larger than the rest of the 220v electric motor carrier frequency times the left and right sides of higher harmonic components as: 2 u + 1 (u for modulation ratio). Can lead to higher harmonic motor stator copper loss, rotor copper loss, iron loss and the increase of the additional loss, the most significant is the rotor copper loss; For asynchronous motor is close to the base wave frequency corresponds to the synchronous speed of rotation, therefore, higher harmonic voltage to a larger slip cutting rotor after conducting bar, will produce very big rotor loss; In addition, also should be considered because of skin effect produced by the additional copper loss. These losses will make motor extra heat, low efficiency, output power decreases, and such as ordinary motor running in the inverter output non-sinusoidal power supply conditions, the general temperature will increase 10% to 20%. 2 motor insulation strength problem At present middle and small converter, many are using the PWM control mode.

 It's about several thousand to more than 10 KHZ carrier frequency, which makes the motor stator winding to withstand high voltage build-up rate, equivalent to impose great impulse voltage gradient on motor, the motor of the turn-to-turn insulation withstand more ordeal. In addition, the rectangular produced by PWM inverter chopper superposition of impulse voltage on the motor operating voltage, which not only high peak and the high frequency impulse voltage, would pose a threat to the electric motor 12v 500w insulation of the motor, to ground insulation under the repeated impact of high pressure can accelerate ageing. 3 harmonic electromagnetic noise and vibration Ordinary motor using frequency inverter power supply, can make the electromagnetic, mechanical, ventilation and other factors caused by the vibration and noise becomes more complicated. Frequency conversion power harmonic and motor electromagnetic part contains all of the time the inherent space harmonic interference each other and form all kinds of electromagnetic vibration force. When the electromagnetic wave frequency and motor of the body's natural vibration frequency is consistent or close to, will produce resonance phenomenon, so as to increase the noise. Due to the motor operating frequency range wide, wide speed change range, all kinds of the electromagnetic wave frequency is difficult to avoid the components of the motor of the inherent vibration frequency.

 Four shaft voltage increase Shaft voltage refers ac motor to two axes voltage or voltage between shaft and shaft, for motor frequency conversion power supply, usually on each phase voltage on the motor is balanced, however, because each phase rectifier components and control components differences in features, may be a momentary voltage imbalance, produced in the shaft larger shaft voltage; Combined with the harmonic voltage on the rotor will be bearing oil film as medium to form a earth capacitance, producing a capacitive current; The current flows through the oil film between shaft and bush, if critical lubrication condition, the oil film will be destroyed, there will be a large current flows through the oil film, thus shortening bearing alloy, bearing life or damage to the accident. 5 motor for frequent starting and braking ability to adapt As a result of the inverter power supply, motor can under low frequency and voltage start, in the form of no impact current and frequency converter is available for braking modes of the brake quickly, create conditions for the realization of the frequent starting and braking, and the mechanical system and electromagnetic system of the motor is in circulation under the action of alternating force, brings to the mechanical structure and insulation structure fatigue and accelerated aging problem. 6 low-speed cooling problems First of all, the impedance of the asynchronous motor is not ideal, when power frequency is low, the power loss caused by high order harmonic. Second, general motors in speed decreases, current and magnetic flux basic keep inconvenience, but the cooling air volume and speed of three proportional to reduce, cause the low speed of a motor cooling conditions deteriorate, a sharp increase in temperature is difficult to realize the constant torque output. General electrical engineer pointed out that, in view of the above issues ahead of protective 8500w gasoline generator measures to prolong the service life of click.

How to judge the faulty difference of servo motor and servo drive?

Error in the drive,alarm,and then check the manual.If no alarm,that nature is drive failure,of

course,it is pumps also possible that the fundamental servo,there is no fault, But the servo control signal failure didn't move.In addition to the drive error,alarm,and then check the manual,sometimes change is the most direct judgment method,such as X and Z axis Servo in (the same type can be).Or modify the parameters,such as electricalmotor1.blogspot.com the X axis locked,don't let the system to detect the X axis But should pay attention to: the X axis and Z axis swaps,even the same type of imported equipment May also be a problem because of the different load,different parameters.If it is,of course,domestic equipment,usually don't adjusting servo parameters for usage,generally do not have a problem.but Attention should be paid to the X axis and Z axis motor torque power generator rotor and statorare the same,whether the motor screw straight league and electronic gear reduction ratio.