Three-phase asynchronous motor efficiency and power factor

 Induction motor efficiency and power factor is contradictory.For the same kind of Y series motor,high efficiency,low power factor.On the other hand,low efficiency,high power factor,high power,good for motor use;The power factor is low,will reduce the network transmission efficiency,because of low power factor,so the grid reactive power loss is big.So for ac induction attack efficiency indicators put forward higher requirements of wholesalemotor.blogspot.com both,puts forward higher requirements to the power factor index.The efficient and high voltage three-phase asynchronous motor,it overcomes the defect of old asynchronous motor,its insulation thickness thinning by the original unilateral 1.5 mm to 1.3 mm;Innovation design of star - Angle joint series hybrid hard winding method,reduce the stray loss of the motor,greatly improving the efficiency of the high voltage motor;Motor efficiency is low,the loss is big.For ac motor,is the resistance loss,in this way,the greater the loss of P in the power triangle,the greater the power factor Angle phi is smaller,the greater the power factor cos phi.Conversely,high efficiency,low loss,P is in the power triangle is smaller,the power factor Angle phi is smaller,the power factor cos phi is smaller.In order to satisfy the motor power factor,efficiency,two indicators,the backward of the structural design of centrifugal fan,a significant reduction in the high efficiency high pressure loss in the three-phase asynchronous motor machinery and noise.

The efficient high-voltage three-phase asynchronous motor can not only improve the work efficiency of the motor,and can also achieve the goal of reducing energy consumption,will be widely used in power stations,petrochemical,urban water supply,cement,paper making,metallurgy,coal and other industries,has an extremely extensive application prospect in the market,has significant economic and social benefits.Shell directly related to the personal safety and equipment protection grade selection of reliable operation,should be based on motor using occasions,to prevent human exposure to the motor internal dangerous parts,prevent solid foreign body into the chassis,prevent water from entering the shell cause harmful effects to the motor.Motor by letters IP protection grade plus two characteristics of Numbers,the first characteristic figures show that Motor vehicle the solid proof,the second feature figures show that the liquid.It is widely used in industry and People's Daily life.This kind of motor stator system group composed of group working system and starting winding.Its working principle are similar to those of three-phase asynchronous motor.The author through the analysis of the working principle of the single-phase capacitor motor to illustrate its positive &negative or transform a one-way operation of single-phase capacitor motor for positive and negative transfer lines of practical control circuit.

A.Simple working principle 1.When you don't answer the capacitance starting winding can a single phase or three phase asynchronous motor starting or running conditions,in terms of this item is set to the current in the winding of motor in whether can produce a rotating magnetic field.If not in the starting system group of the single-phase capacitor motor concatenated appropriate capacitor Tend to attend.If you want to improve the power factor,should reduce the motor air gap,increase the serial number of turns per phase.And rotor balancing machine to improve efficiency,increase should be ac motor air gap,which can reduce the harmonic stray loss,due to the harmonic stray loss and air gap of 1.5 ~ 1.6 power ratio.The two measures the reverse.When turn the timer can't start again,to the motor shaft by hand a little at this time can turn the rotation of the external force.After inspection found that the washing machine in the two capacitors,there is a short circuit phenomenon in a capacitor,the only change after short circuit capacitor in the same specification,then turn the timer when the normal operation of washing machines.In the washing machine motor is the typical positive &negative use capacitor motor control mode.Single-phase capacitor start motor is one of the single-phase asynchronous motor.