Three-phase asynchronous motor will convert electrical energy into mechanical energy at the same time, itself will also lose a part of the energy, the loss can be generally divided into variable loss, fixed loss and stray loss three parts. Here is a simple understanding with Senli Motor Xiaobian!

       Variable losses vary with load, including stator resistance loss (copper loss), rotor resistance loss, and brush resistance loss. Fixed losses are load independent and include core losses and mechanical losses. The iron loss is also composed of hysteresis loss and eddy current loss, which is proportional to the square of the voltage, and the hysteresis loss is inversely proportional to the frequency. The other stray losses of three-phase asynchronous motors are mechanical losses and other losses, including the friction loss of bearings and the wind resistance loss caused by rotation of fans and rotors.

       At present, the understanding of stray loss is still in the research stage. Some of the main methods to reduce stray loss are: heat treatment and finishing to reduce the rotor surface short circuit; Rotor groove inner surface insulation treatment; Harmonics are reduced by improving the stator winding design.

       Some are by improving the three-phase asynchronous motor rotor slot design and coordination to reduce harmonics, increase the fixed, rotor tooth slot, the rotor groove shape design into a inclined slot, the use of series sinusoidal winding, spread winding and short distance winding can greatly reduce high harmonic;It is an effective method to reduce additional stray loss by using magnetic groove mud or magnetic groove wedge instead of traditional insulated groove wedge and filling the groove of motor stator core with magnetic groove mud.

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