Outer rotor water cooling structure of permanent magnet synchronous hub motor

Abstract

The invention relates to the technical field of hub motors, in particular to an outer rotor water cooling structure of a permanent magnet synchronous hub motor, which comprises an outer rotor permanent magnet synchronous hub motor, an outer rotor waterway cooling pipe, a waterproof bearing and an axial flow impeller, the two ends of the outer rotor waterway cooling pipe are welded between the inner ring of the waterproof bearing and the surface of an axial-flow impeller shaft and are tightly attached to the periphery of motor permanent magnets and the inner wall of a rotor core through end covers. When the hub motor rotates, the outer rotor waterway cooling pipe and the axial flow impeller are driven to rotate, and cooling water enters the outer rotor waterway cooling pipe through the axial flow impeller to cool the permanent magnets. A rotor adopts water internal cooling, the temperature rise of the permanent magnets is low, the reduction of magnetic performance and irreversible demagnetization of the permanent magnets due to over-high temperature are avoided, and the motor is reliable in operation. The permanent magnet adopts an axial segmented structure, and omega-shaped coolingwater pipes are arranged between every two adjacent permanent magnets, so that waterways can be in full contact with the permanent magnets and the inner wall of the rotor, and the heat dissipation isimproved; the permanent magnet segmented structure can significantly reduce the eddy current loss of the permanent magnets and reduce heat generation.

Description

technical field [0001] The invention relates to the technical field of hub motors, in particular to a water-cooling structure for an outer rotor of a permanent magnet synchronous hub motor. Background technique [0002] Due to energy shortage and environmental pollution, energy-saving and environmentally friendly new energy vehicles have become the development trend of the automotive industry. Due to the combination of in-wheel motors and power electronic devices, it has many advantages such as high integration, high transmission efficiency, simplified chassis structure, flexible layout, four-wheel independent control, and space saving in the car. However, since the in-wheel motor drive system integrates the in-wheel motor, deceleration mechanism, and brake in the wheel, the air circulation in the narrow space of the wheel is not smooth and heat dissipation is difficult. At the same time, the internal space of the hub motor is small, the loss density is relatively high, and...

AI Technical Summary

Problems solved by technology

However, because the hub motor drive system integrates the hub motor, deceleration mechanism, and brake in the wheel, the air circulation in the small space of the wheel is not smooth, and heat dissipation is difficult.

At the same time, the internal space of the hub motor is small, the loss density is relatively high, and the sealing is required to be high. It is difficult to discharge the internal heat during the operation of the motor, which will cause the motor to overheat, the temperature of the permanent magnet will increase, the magnetic performance will decrease, and even the permanent magnet will be irreversible. Demagnetization seriously affects the safe and stable operation of the motor, so designing an efficient permanent magnet cooling structure is of great significance to prolong the service life of the hub motor and improve the performance of the vehicle

Images