How much is the no-load current of asynchronous motor?

 electric motor stator rotor lamination motor parts 
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1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 
5.stunning performance 
Asynchronous motor no-load running, the current in the three-phase winding of the stator, is called the no-load single phase motor current. Most of the no-load current is used to produce a rotating magnetic field, known as the no-load excitation current, no-load current reactive component. There is a small part of no-load current is used to produce all kinds of power loss during no-load running (such as friction, ventilation and core loss), the no-load current is a part of the active component, due to account for the proportion of small, negligible. Therefore, can think of is reactive current idle current. From this point of view, it is as small as possible, so that the ac motor prices power factor of the motor raised, the power supply is good.


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1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
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4. low noise and vibtration
 If no load current is big, because of the stator winding conductors carrying area is certain, allowed through current is certain, allows for active current can reduce flows through a wire, the motor can drive the load will be reduced, the motor output is reduced, with too much load, winding would be easy to fever. But the no-load current also cannot too small, otherwise will affect the other performance of the motor. Generally the no- load current of the small motor Three phase motor is about 30% ~ 70% of rated current, the no-load current of the large and medium- sized motor is about 20% ~ 40% of rated current. What is specific to the no-load current of an electric motor, the motor nameplate or product manuals, generally not marked. Have electrician often need to know how much is this value, this value to judge the quality of the motor repair, can use.

The inverter no-load current is greater than the load current

A 75 kw micro can WIN-G9 inverter commissioning the strange phenomenon,Associated with the manufacturer's technical personnel a piece of paper,trying to find out the cause of the electrical and mechanical aspects.Whether whether new repair,such as motor winding winding bad; Bearing any permanent magnet generator wear and tear,unstable running; Is there a loose connection shaft and different heart phenomenon; The blades have deformation,etc.To restore the original start tank connection,power frequency power frequency starting motor do diesel generators prices contrast,one by one,ruled out the suspect,and according to the in-situ observation,the motor and the load status is good,can hardly hear the running of electrical and mechanical noise.Run at full speed under no load current is only less than 35 a,three-phase balance,no wave! No problem with the motor and load,the problem also in frequency converter.So of the frequency converter fault in where? 

A little scratching his head.Is that current detection not,cause error output? Observation panel displays the current value and clip-on ammeter measured near,there should be no problem.Or there is something wrong with the CPU motherboard,the output waveform is wrong? Makes no sense.Digital circuit ah,how waveform is wrong? Well,live not far electricalmotor1.blogspot.com from here have another same model with the power of change,with the load is the same,it would be great.It brought great convenience to the contrast test.The manufacturer in a hurry to opening up to the machine,also gives a positive cooperation.Will two inverter current transformer swaps,invalid.The motor vehicle two machine CPU motherboard swap shall be null and void.Bring up the main circuit,according to the dc voltage is 550 v,voltage sampling circuit also have no problem.Never figured out where fault block circuits.Compare the machine in the load cases,10 hz running current is 75 a,more than 35 hz,running current to reach 100 a,smaller than this one with no-load current of motor.No-load current was far greater than the load current,the frequency converter must be have a problem.