Spiral double-water flow channel cooling high-power density permanent magnet synchronous motor

Abstract

The invention discloses a spiral double-water flow channel cooling high-power density permanent magnet synchronous motor, which comprises a stator, a rotor and a cooling system, wherein the cooling system is composed of a temperature sensor (14), a DSP control chip, a first spiral water flow channel (12), a second spiral water flow channel (13) and a water pump; and a motor shell (15) is internally provided with a first spiral water flow channel (13) and a second spiral water flow channel (12) with the water flow opposite to the first spiral water flow channel. The spiral double-water flow channel cooling high-power density permanent magnet synchronous motor has the advantages that the cooling performance of the motor is improved; the cooling temperature of a high-power motor can be effectively solved; hidden safety dangers and losses caused by irreversible demagnetization of the permanent magnet when the permanent magnet synchronous motor run at a high temperature for a long time can be avoided, and the spiral double-water flow channel cooling high-power density permanent magnet synchronous motor is widely applied to a high-power permanent magnet synchronous motor application scene.

Description

technical field [0001] The invention belongs to the technical field of heat dissipation of high power density permanent magnet synchronous motors. Background technique [0002] As the power density requirements of electric vehicle drive motors are getting higher and higher, the permanent magnet synchronous motor rotor is provided with a magnetic field by permanent magnets and does not need excitation windings, so its structure is simple, the corresponding assembly and processing costs are low, and it is easy to maintain. The permanent magnet synchronous motor does not need an excitation power supply, so it is more energy-saving. Since the permanent magnet synchronous motor has no brush and collector ring structure, there is no friction of the corresponding parts when the motor runs at high speed, and the motor is more reliable and safe in operation and has a longer service life. The permanent magnet of the permanent magnet synchronous motor can provide a stronger magnetic fi...

AI Technical Summary

Problems solved by technology

Most of the existing water-cooling technologies divide the casing into the inner wall of the casing and the outer wall of the casing, forming a cavity on the inner wall and the outer wall as a water flow channel, and setting a water inlet and a water outlet on the outer wall of the casing. The three-phase water cooling permanent The magnetic synchronous motor and the cooling water channel structure of the electric vehicle water-cooled permanent magnet synchronous motor in the patent document CN103401346A all adopt a similar water-cooling structure. The water channel of this structure is formed by pressing the inner wall and the outer wall of the shell. The disadvantages are: 1. In order to ensure a good sealing effect, high processing accuracy is required, the processing cost is high, and complete sealing cannot be ensured, which will cause water leakage; 2. The water pressure of the water flow channel formed by press-fitting should not be too high. The water channel with too large corner will generate a large impact force when the water flows through it, and at the same time cause water pressure loss and affect the heat dissipation effect, so it is not suitable for motors with high power requirements; 3. Due to this structure, the temperature of the water inlet will be low , the temperature of the water outlet is high, which makes the heat dissipation of the motor uneven, and the temperature difference between the various parts of the motor is large, which is easy to cause damage to the motor

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