Motor capable of reducing thermal stress of winding potting body

Abstract

The invention discloses a motor capable of reducing thermal stress of a winding potting body. The motor is characterized by comprising a rotor, a stator core, a stator winding and a potting body; thestator winding is arranged around the stator iron core; the rotor is arranged in the stator iron core in a penetrating mode in the axial direction and is in running fit with the stator iron core; thetwo groups of encapsulation bodies are respectively used for insulating and sealing the two end parts of the stator winding; and at least one pressure reduction channel is formed in the pouring body and located in the surface or / and the interior of the pouring body so as to provide a space or a gap for eliminating supply force. According to the invention, on the basis of basically not changing thestructure and material of the existing motor, the problems of cracking and falling of the potting body caused by uneven temperature distribution of the inner and outer sides, excessive internal stress and the like are effectively solved, and the risk of motor performance reduction and even damage is avoided, so that the reliability of the motor is improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a motor capable of reducing thermal stress of a winding potting body. Background technique [0002] In the prior art, the stator windings of the motor are often potted with insulating materials, so as to avoid the problem that the stator windings may be damaged by the vibration generated during the operation of the motor due to the thin stator windings (usually enameled wires) and large number of turns. At the same time It can also avoid the problem that the stator temperature is too high when the current density is high. [0003] Such as figure 1 , 2 As shown, the structure of the motor stator in the prior art includes: a housing 11 , a rotor 12 , a stator core 13 , a stator winding 14 surrounding the stator core, and potting bodies 15 that insulate and seal both ends of the stator winding 14 . The existing encapsulation structure of the motor stator is to directly pour insula...

AI Technical Summary

Problems solved by technology

[0004] The existing structure of the above-mentioned potting body 15 has the following problems: 1. Because the potting body 15 is generally an integral one-time potting, which is a complete cylindrical structure, there is a certain internal stress after curing; 2. The material of the potting body 15 After the motor has been running for a long time, the temperature of the stator winding is the highest, and the outside of the potting body 15 is relatively low due to its proximity to the motor casing 11 and the low-temperature medium, so the potting body 15 as a whole presents from A case where the temperature decreases gradually from the inside to the outside, i.e. the temperature distribution in the potting body is uneven after the motor has been running for a long time

The above two problems directly lead to cracking and peeling of the potting body 15, which will lead to a decrease in the performance of the motor or even damage the motor

Although the problem of cracking can be improved by thickening the potting body 15, it will lead to an increase in cost. On the other hand, the thickness of the potting body 15 is also easily limited by the size of the motor.

Images