The load current and no-load current of the machine

(1) asynchronous motor no-load running,set the current in the www.dongfeng-motor.com three-phase winding,referred to as the no-load current.Most of the no-load current is used to produce a rotating magnetic field,Is known as the no-load excitation current,no-load current of 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,light electricity

Flow can be thought of reactive current.From this point of view,it is as small as possible,so that

the power factor of the motor raised,the power supply is good. 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 only flows through the wire Can reduce,the motor can drive the load will be

reduced,the motor output is reduced,with excessive load,the winding is easy to heat.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 is about 30% ~ 70% of rated current,large and medium-sized electric The no-load current of the machine is about 20% ~ 40% of rated current.What is specific to the no-load current of an electric motor,on the motor nameplate or product

acmotortrading.blogspot.com specifications,a 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." (2)

formula is the scene perkins diesel generator set quickly calculate motor no-load

current of specific numerical formula,it is a lot of test data.It is in line with "the no-load

current of the motor Is the 1/3 of its rated current ".At the same time it is in line with practice

experience: "the no-load current motor lamination of the motor,shall not exceed the

capacity of the kw number can be used for" the principle of (after repair Old,small capacity

motor).Formula "capacity by about eighty percent for" refers to the general motor no-load current

value was 0.8 times the number of motor rated capacity kw left On the right.No-load current of

medium-sized,4 or 6 pole motor,is the number of motor capacity kw 0.8 times; The number of new

series,large capacity,small 2 levels of motor,The no-load current calculation according to the number

of "xinda sixty percent less"; For the old,old series,small capacity,the number of large more than 8 pole motor,the no-load current,Press "is a small number of very many kilowatts",namely the no-load current value approximately equal capacity kw,but is generally less than kilowatts.