In-stator slot oil cooled high power density permanent magnet synchronous motor

Abstract

The invention provides a method for designing the in-stator slot oil cooling of a high power density permanent magnet synchronous motor of an electric vehicle. The in-stator slot oil cooled high power density permanent magnet synchronous motor comprises a shell, a front end cover, a rear end cover, a rotor, a stator, a shaft and the like, and is characterized in that: the two ends of the stator are provided with a front oil guide casing and a rear oil guide casing; an oil inlet is formed on the front oil guide casing and the shell; a return opening is formed on the rear oil guide casing and the shell; axial oil ducts are formed in a stator slot directly by utilizing winding spaces; and cooling oil flows into the front oil guide casing from the oil inlet under the action of a pressure, flows into the axial oil ducts from an end part and finally flows back to an oil chamber from the return opening on the rear oil guide casing. Windings on the end parts of the cooled motor can be effectively cooled, and the tooth parts of the motor and the windings in the slot also can be cooled, so the method for designing the in-stator slot oil cooling can greatly reduce temperature rise in the motor and improve the power density of the motor.

Description

Oil-cooled high power density permanent magnet synchronous motor in stator slots technical field The invention relates to the application field of electric vehicles, in particular to the field of oil-cooled high-power-density high-power drive motors for electric vehicles. Background technique In order to improve the utilization of motor electromagnetic load and materials, efficient motor cooling technology is the key to achieve this goal. According to the different cooling medium, the cooling method of the motor can be divided into three ways: air cooling, water cooling and oil cooling. The air-cooled motor is adopted, and the additional fan makes the structure of the motor huge, and the efficiency of the entire cooling system is not high. The water circulation cooling method is to set a circulating water channel in the casing. The heat inside the motor is first transmitted to the casing and the end cover, and then the heat in the casing is taken away by circulating water...

AI Technical Summary

Problems solved by technology

The oil cooling method immerses the stator and rotor of the motor in the special cooling oil, and the cooling effect is good, but the cooling oil has to be stirred by the blades, and the energy loss is large at high speed

For high power density motors, due to the limited size and space and the need to output a large torque, the current density of the motor is large, the internal loss of the motor is large, and the heating of the stator winding is aggravated. An efficient cooling system is necessary

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