对于绕组槽满率较低的电机,增加浸漆次数或采用真空压力浸漆,可改善绕组槽内及机座与铁心间的导热,但绕组端部漆层堆积不利散热。而且,绕组外部包络的漆也导致后续浸漆时漆液无法进入绕组的内部,对于改善温升作用不大。
有条件或必要时,调整电磁参数可以有效控制温升,如:减少定子绕组每槽匝数、增大导线直径,即减小电磁线负荷和导线电流密度,对降低温升十分有效。特别是封闭式电机,定子绕组匝数减少后,定转子铜损耗都减小,虽然铁损耗增加,但铁心比绕组容易散热;还有一个问题是减少绕组数后功率因数会降低,起动电流要增加,可能需要适当增加铁心长度或更改转子槽形综合提升总体的效果。
对于转子部分,当转子铁心磁密允许时,可以扩大槽形下部面积,或增大高转速电机的端环截面,特别对降低封闭式电机定子温升有一定效果。
某些规格的电机受到外形尺寸的限制,提高绕组绝缘等级来解决温升问题,有时也必要且合理。

For motors with low winding slot filling rate, increasing the number of immersion coatings or using vacuum pressure immersion coatings can improve the thermal conductivity inside the winding slots and between the base and the iron core, but the accumulation of paint layer at the end of the winding is not conducive to heat dissipation. Moreover, the paint on the outer envelope of the winding also prevents the paint liquid from entering the interior of the winding during subsequent immersion, which has little effect on improving temperature rise.
When conditions permit or necessary, adjusting electromagnetic parameters can effectively control temperature rise, such as reducing the number of turns per slot of the stator winding, increasing the wire diameter, that is, reducing the electromagnetic wire load and wire current density, which is very effective in reducing temperature rise. Especially for enclosed motors, when the number of turns in the stator winding decreases, the copper loss in both the stator and rotor decreases. Although the iron loss increases, the iron core is easier to dissipate heat than the winding; Another issue is that reducing the number of windings will reduce the power factor and increase the starting current. It may be necessary to increase the length of the iron core or change the rotor slot shape to comprehensively improve the overall effect.
For the rotor part, when the magnetic density of the rotor core allows, the area of the groove shaped lower part can be expanded or the end ring section of the high-speed motor can be increased, especially for reducing the stator temperature rise of closed motors.
Some specifications of motors are limited by their external dimensions, and it is sometimes necessary and reasonable to improve the insulation level of the windings to solve the problem of temperature rise.
