A permanent magnet synchronous motor temperature control system for new energy vehicles

Abstract

The invention relates to a permanent magnet synchronous motor temperature control system for new energy vehicles, which includes a permanent magnet synchronous motor and a cold air supply mechanism. The permanent magnet synchronous motor includes a casing, a stator, a motor shaft and a rotor. Cavity A and cavity B; the cold air intake passage includes a cold air passage A arranged on the motor shaft and a plurality of cold air passages D arranged on the rotor, the cold air passage A communicates with the cold air supply mechanism through a rotary joint and a rubber pipe A, The cold air channel A communicates with the middle of each cold air channel D through multiple radial cold air channels; the cold air exhaust channel includes exhaust channel A and exhaust channel B arranged on the casing, and the exhaust channel A communicates with the cavity , the exhaust passage B communicates with the cavity B, and the exhaust passage A and the exhaust passage B are respectively provided with a gas check valve A. The heat dissipation condition in the motor can be obviously improved, the cooling efficiency is high, the cooling effect is remarkable, and the temperature rise of the motor can be effectively controlled for a long time.

Description

Technical field: [0001] The invention relates to the technical field of motors, in particular to a permanent magnet synchronous motor temperature control system for new energy vehicles. Background technique: [0002] Motor is one of the three core components of new energy vehicles. The drive motors used in existing electric vehicles mainly include DC motors, asynchronous motors, permanent magnet synchronous motors and switched reluctance motors. Due to its wide speed range, high power density, simple process, small size, reliable and durable operation, permanent magnet synchronous motors have developed rapidly in recent years and are widely used in BYD Qin, BYD Song DM, Song EV300 and BAIC EV Series and other new energy vehicles, it has become a mainstream motor and is selected by major new energy vehicle brands. [0003] Although the permanent magnet synchronous motor has many advantages, such as figure 1 Shown is a schematic diagram of the main structure of the existing ...

AI Technical Summary

Problems solved by technology

However, although this solution uses cold air, the cold air does not cool the rotor at the first time, but the cavity at the end of the rotor. This makes it impossible to use the coldest cold air to cool the rotor immediately, resulting in a delay in cooling the rotor. In addition, This solution will also cause part of the cold air to directly enter the cavity at the right end through the air gap, further reducing the cooling effect of the cold air. In addition, this solution does not effectively distinguish between the parts with the highest temperature rise and the lowest temperature rise in the rotor, and the cooling symmetry is poor. As a result, the temperature of the right end of the motor is higher than that of the left end, which also leads to the limitation of cooling in this solution, and there is a large waste of energy

Images