Stator Losses
1. Increase the cross-sectional area of the stator slot. Under the condition of the same stator outer diameter, increasing the cross-sectional area of the stator slot will reduce the magnetic circuit area and increase the magnetic density of the teeth.
2. Improve the full slot ratio of the stator slots, which is good for motors with small bottom pressure. The use of winding and insulation specifications and large cable diameters can improve the full slot ratio of the stator.
3. Reduce the length of the stator winding end section, the stator winding end loss accounts for 1/4 to 1/2 of the total winding loss, reducing the winding end section length can improve the high efficiency of the motor. The test shows that the length of the end section is reduced by 20%, and the loss is reduced by 10%.
Stray Loss
Today, the understanding of motor stray losses is still in the research stage. Some of the main ways to reduce stray damage today are:
1. Use heat treatment and finishing to reduce short-circuit on the surface of the rotor.
2. Insulation treatment of the inner surface of the rotor slot.
3. Reduce harmonics by improving stator winding design.
4. Improve the rotor slot coordination design and coordination to reduce harmonics, improve the stator and rotor cogging, design the rotor slot shape as inclined slots, and select series-connected sinusoidal windings, spread windings and remote windings can greatly reduce high-order harmonics ;It is a reasonable way to reduce additional stray loss by using magnetic slot mud or magnetic slot wedge to replace the traditional insulating slot wedge and smoothing the motor stator core slot with magnetic slot mud.
Wind Friction Loss
The wind and friction loss accounts for about 25% of the total damage to the motor, and should be given great attention by everyone. Friction damage is mainly caused by bearings and sealing, which can be reduced by the following measures:
1. Minimize the size of the shaft as much as possible, but take into account the provisions of output torque and rotor dynamics.
2. Use high-efficiency bearings.
3. Use efficient lubrication systems and lubricants.
4. Choose good sealing technology.
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