Permanent magnet synchronous traction motor and oil cooling device thereof

Abstract

The invention discloses an oil cooling device used for a permanent magnet synchronous traction motor. The oil cooling device comprises a cooling channel formed in a shell and an end cover; the cooling channel is communicated with an external oil supplying pipeline by an oil inlet and is communicated with an external oil returning pipeline by a first oil outlet; an oil spraying port is formed in the shell and/or the end cover and is communicated with the cooling channel and an inner cavity of the permanent magnet synchronous traction motor; a second oil outlet is formed in the shell; the inner cavity is communicated with the external oil returning pipeline by the second oil outlet to guide cooling oil in the inner cavity. In such a mode, the oil cooling device can realize the direct cooling of the shell and the end cover, and meanwhile, the inner structure of the shell can be directly and effectively cooled by the cooling oil entering the inner cavity from the oil spraying port, so the cooling efficiency of the oil cooling device is improved, and the work performance of the oil cooling device is improved. The invention also discloses a permanent magnet synchronous traction motor comprising the oil cooling device.

Description

technical field [0001] The invention relates to the technical field of motor cooling devices, in particular to an oil cooling device for permanent magnet synchronous traction motors. The present invention also relates to a permanent magnet synchronous traction motor comprising the above-mentioned oil cooling device. Background technique [0002] In recent years, permanent magnet synchronous traction motors have been widely used in the field of electric vehicles due to their high power density and high comprehensive utilization efficiency. In order to prevent foreign matter from entering the motor, the permanent magnet synchronous traction motor is generally designed as a fully enclosed structure, and the motor will inevitably generate heat during operation. The internal components of the motor will be exposed to high temperature for a long time, which will reduce the service life. Therefore, the oil cooling device becomes An important part of the permanent magnet synchronou...

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Problems solved by technology

[0004] However, in the traditional oil cooling device, the cooling channel for oil cooling is only opened on the external sealing structure, which can only directly cool the shell and the end cover. For the components that really need to be cooled, such as the stator and rotor inside the shell, It can only rely on the stator core and the air inside the motor to transfer heat, but cannot directly cool effectively through the oil cooling device, which limits the cooling range of the oil cooling device and reduces the overall cooling performance of the motor

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