Rotor oil-cooled permanent magnet motor

Abstract

The invention discloses a rotor oil-cooled permanent magnet motor. The rotor oil-cooled permanent magnet motor is composed of a stator assembly, a permanent magnet rotor, a first sliding bearing and asecond sliding bearing which are arranged at the left and right sides respectively. The permanent magnet rotor comprises a rotating shaft, a rotor bracket, a rotor yoke part and a permanent magnet pole, a central runner is arranged in a central hole of the rotating shaft, and the first sliding bearing generates a lubricating oil pressure cavity to press the lubricating oil to flow through the central runner, so that the permanent magnet pole is cooled. The application object of the invention is the low-speed permanent magnet motor provided with the sliding bearings, the original lubricating oil for lubricating and cooling the sliding bearings is fully utilized, and the direct oil cooling of the permanent magnet pole is realized only by slightly improving the runners formed at the rotatingshaft and the rotor yoke part. According to the invention, the size and weight of an original motor are not increased basically, the complexity of the sliding bearings is not increased, the cooling effect is obviously superior to that of the traditional air cooling, and extra noise is not generated. According to a static pressure and dynamic pressure scheme provided by the invention, the runner and a heat pipe structure can be selected by motors with different rotating speeds.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to a rotor oil-cooled permanent magnet motor. Background technique [0002] At present, permanent magnet motors are widely used in the field of low-speed direct drive due to their advantages of high efficiency, small volume and weight, and simple maintenance. In low-speed direct drive fields such as ship electric propulsion and mining direct drive, permanent magnet motors generally use oil-lubricated sliding bearings due to low speed and high power. [0003] For permanent magnet direct drive motors in the above fields, generally the stator is an armature winding, and the rotor is a permanent magnet pole. The stator generally adopts a water-cooled structure, and the temperature resistance level of the stator insulation can reach 180°C or even higher, so the cooling of the stator is relatively easy. Although the heat generated by the permanent magnet rotor itself is small, it is diff...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the poor cooling effect or complicated structure of the permanent magnet rotor of the existing low-speed direct drive permanent magnet motor with its own fan, and the problem of high noise in the forced ventilation permanent magnet motor, and provides a rotor oil-cooled permanent magnet motor, which is suitable for Low-speed permanent magnet motors with oil-lubricated plain bearings

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