Stator water cooling device of external rotor permanent magnet synchronous machine

Abstract

The invention provides a stator water cooling device of an external rotor permanent magnet synchronous machine. An internal group of ring-shaped cooling water channels and an external group of ring-shaped cooling water channel are installed on the stator iron centre with a shaft of an machine as the center; two groups of ring-shaped cooling water channels are both formed by uniformly distributingat least six pipelines as a ring; a first and a second ring-shaped channels respectively communicated with the internal and external groups of cooling water channels are installed in a back end coverof the machine; a third ring-shaped channel communicated with the internal and external groups of cooling water channels is installed at the front end cover of the machine; a water inlet channel and awater outlet channel are installed in the shaft of the machine, the water inlet channel is communicated with the first ring-shaped channel, and the water outlet channel is communicated with the second ring-shaped channel. The invention can directly cool the inner heat source of the external rotor, and has the characteristics of quick cooling speed, high efficiency, compact structure, simple and convenient technology.

Description

technical field [0001] The invention relates to the technical field of motor cooling, in particular to a stator water cooling structure of an outer rotor permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor is a direct drive torque servo motor widely used in machinery industry, electric vehicles, household appliances, manufacturing equipment and other fields. [0003] Traditional small and medium-sized motors generate less heat, and heat dissipation has little effect on motor performance. However, for AC permanent magnet servo motors with high torque density, the heat dissipation capacity of the motor directly affects the service life and operating life of the motor. It is particularly important whether the cooling method and structure can meet the heat dissipation requirements. For the outer rotor permanent magnet motor, the heat dissipation of the stator is more difficult than that of the inner rotor permanent magnet motor, ...

AI Technical Summary

Problems solved by technology

[0006] The above two water-cooling systems are compact in structure and fast in cooling speed. The former is mainly for surface cooling, and water channels are set up in the motor, which has a relatively complicated structure and is difficult to process; the latter cooling pipe is placed in the groove and directly contacts the coil. The cooling range is great limitations

These two cooling methods can meet the cooling needs of general inner rotor motors, but for outer rotor motors, the built-in stator makes heat dissipation more difficult, and the high power density permanent magnet motor has limited volume, and the effect of surface cooling is still insufficient

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