An oil-cooled, low-consumption inner rotor permanent magnet motor

Abstract

The invention provides an oil-cooling and low-loss internal rotor permanent magnetic motor, which belongs to the motor field and aims to reduce the oil friction loss, to improve the heat radiation performance, and further to increase the power density of a motor applied to an oil-immersed environment. The invention comprises a stator and a rotor. The stator comprises a housing, a stator iron core, an insulation layer, a shaft direction key, a plurality of stator coils and two end covers. The rotor comprises a rotor shaft, a rotor magnetic yoke, two bearings and a plurality of magnetic steels. According to the invention, the two sides of the inner round arc face of each magnetic steel are cut with inner angles. The outer round face formed by the plurality of magnetic steels is provided with a flow guiding groove along the shaft direction in a rotation manner. The inner round face of the rotor magnetic yoke is provided with inclined flow passing grooves in the shaft direction. The plurality of inclined flow passing grooves are symmetrically distributed around the round circumference. When the stator iron core is casted into shape directly, a plurality of back flow holes are supposed to be reserved on the yoke part or a plurality of back flow grooves are reserved at the back to provide a passage for oil to circulate inside the motor. In an oil-immersed high temperature environment, when such a motor is used, the power density can be increased, therefore, making the motor of great practical value.

Description

Technical field [0001] The invention relates to an inner rotor permanent magnet motor, belonging to the field of motors. Background technique [0002] In the design of permanent magnet motors, in order to reduce the harmonics of the air gap magnetic field, unequal air gap design schemes are often adopted. The outer surface formed by the magnetic steel bonded to the rotor yoke is not a smooth cylindrical surface (such as Figure 15 Shown), but there is a bump. In some working environments, the motor runs in oil and is filled with oil. Compared with the motor running in air, it will cause special problems. First of all, when the rotor moves in the fluid, the non-smooth outer surface causes greater resistance, the motor's oil friction loss increases, the efficiency decreases, and the power density of the entire system decreases. Secondly, the oil in the air gap of the existing oil-filled permanent magnet motor basically flows in a circumferential direction, and the axial flow is sma...

AI Technical Summary

Problems solved by technology

First of all, when the rotor moves in the fluid, the non-smooth outer surface causes greater resistance, the oil friction loss of the motor increases, the efficiency decreases, and the power density of the entire system decreases

Secondly, the oil in the air gap of the existing oil-filled permanent magnet motor basically flows in the circumferential direction, and the axial flow is relatively small. The heat transfer mainly depends on heat conduction, and the good thermal conductivity of the oil is not fully utilized.

Images