In the current social development, the motor provides the most important energy for the majority of enterprises, but the current operation efficiency of the motor is obviously not high. For the reasons that affect the operation efficiency of the motor, for this problem, through the article, it is introduced.
 At present, the guide points out that the three main factors affect the efficiency of the motor operation, resulting in the efficiency of the motor decline.
 1、 The problem of floating capacity leads to the phenomenon that the cart pulls the trolley, that is to say, the selection of reserve coefficient is improper and there are more, which will result in the motor power far greater than the shaft power;
 2、 If the motor itself is not equipped with frequency converter, it can not make corresponding changes according to the climate. If it can not reduce the output power when it is needed, resulting in the increase of useless power, it will affect the efficiency of the motor;
 3、 The problems of the motor itself, such as the rotating part of the motor, once the lubrication effect is not good, it will also affect the efficiency. For example, the terminal voltage of the motor is too low, it will also affect the efficiency of the motor.
 Use time motor efficiency higher power like most equipment, motor efficiency increases with the increase of set power speed high speed motors are generally more efficient types such as squirrel cage motors are generally more efficient than slip ring motors.
 The efficiency of tefc is usually higher than that of SPDP, and the rewinding of the motor will reduce the efficiency.
 To sum up, generally in an ideal situation, the efficiency of the motor should be 100%, that is to say, in the process of energy conversion, every kilowatt of electric energy should be all converted into useful work. However, it is not necessarily the case, which is impossible to achieve, because the conversion percentage of each motor is different, so there are many factors affecting the efficiency of the motor.