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Design method of high-power density motor cooling system and motor designed through method

A high power density, motor cooling technology, applied in computer-aided design, cooling/ventilation devices, manufacturing motor generators, etc., can solve the problems of irreversible demagnetization of permanent magnets, reduced motor performance, limited power density, etc., to solve local high temperature problems, reducing heat generation, and reducing eddy current loss

Pending Publication Date: 2020-06-02
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The local high temperature of the motor will reduce the performance of the motor and limit the increase of power density. At the same time, the highest point temperature may exceed the winding limit temperature and cause the winding to burn out, or the local high temperature will cause irreversible demagnetization of the permanent magnet, causing damage to the motor.

Method used

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  • Design method of high-power density motor cooling system and motor designed through method
  • Design method of high-power density motor cooling system and motor designed through method
  • Design method of high-power density motor cooling system and motor designed through method

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Such as Figure 5 As shown, when the number of distribution pipes is equal to 1, the coolant flow channel includes a spiral pipe connected between the water inlet 1 and the water outlet 2 and arranged coaxially with the stator housing 3, the centerline of the spiral pipe coincides with the axial centerline of the stator housing 3. The cross section of the spiral duct is rectangular. The equivalent diameter of the spiral pipe decreases gradually from the water inlet 1 to the water outlet 2, which can effectively solve the problem of uneven axial temperature of the motor.

Embodiment 2

[0071] Such as Figure 6 As shown, when the number of distribution pipes is equal to 1, the coolant flow channel includes several longitudinal pipes arranged axially along the stator shell, wherein the first longitudinal pipe communicates with the water inlet 1, and the last longitudinal pipe communicates with the water outlet The nozzles 2 are connected; among the other longitudinal pipes, there are connecting pipes connecting the two adjacent longitudinal pipes, and the connecting pipes are arranged in a staggered manner. The cross-sections of the longitudinal duct and the connecting duct are both rectangular. The equivalent diameter of the coolant flow channel decreases gradually from the water inlet 1 to the water outlet 2, which can effectively solve the problem of uneven temperature around the motor.

Embodiment 3

[0073] Such as Figure 7 and Figure 8 As shown, when the number of distribution pipes is greater than 1, the coolant flow channel includes a number of distribution pipes connected to the water inlet 1, a number of distribution pipes connected to the water outlet 2, and cooling channels for the water inlet 1 to flow into. Convergence pipe 1 for diverting the liquid into each diversion pipe 1, confluence pipe 2 for diverting the coolant in each diversion pipe 1 to diversion pipe 2, and for diverting the coolant in each diversion pipe 2 to the water outlet Convergence pipeline 3 of 2; several distribution pipelines 1 and several distribution pipelines 2 form several distribution pipelines, each distribution pipeline is arranged along the circumferential direction of the stator housing 3, and several distribution pipelines are evenly distributed along the axial direction of the stator housing 3; The equivalent diameter of the same shunt pipe is the same, and the equivalent diame...

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Abstract

The invention relates to a design method of a high-power density motor cooling system and a motor designed through the method. The motor comprises a rotor assembly, a stator assembly and a cooling system. The rotor assembly includes a rotor yoke and a permanent magnet. The stator assembly comprises a stator yoke, a stator shell, stator teeth and a stator winding. The cooling system is integrated in the stator assembly. The cooling system comprises a water inlet, a water outlet and a cooling liquid flow channel, and the cooling liquid flow channel is arranged in the stator shell. Heat generatedby the stator winding is transmitted to the stator housing through the stator yoke; the flow velocity of the cooling liquid in the cooling system is gradually increased from the water inlet to the water outlet, so the heat dissipating capacity of the cooling liquid close to the water outlet can be effectively increased, the temperature field distribution of the motor stator is uniform, and the cooling system has important significance for improving the heat dissipating efficiency and the power density of the motor.

Description

technical field [0001] The invention relates to the technical field of drive motors, in particular to a design method for a cooling system of a high power density motor and a motor designed by the method. Background technique [0002] Under the international background that all countries in the world are increasing investment in the field of new energy, it is more and more important to reduce the weight and volume of the drive motor and increase the power of the drive motor. Therefore, the development of high power density drive motors is highly valued by various countries Pay attention to. The Ministry of Science and Technology’s 2018 National New Energy Vehicle Key Project specified the development goals of electric drive systems: the power density of passenger car motors reached 4.0kW / kg, and the torque density of commercial vehicle motors reached 18Nm / kg. As the power of the driving motor increases, the heating power will inevitably rise. The heat generation seriously h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23H02K5/20H02K9/19H02K15/14G06F119/08
CPCH02K5/20H02K9/19H02K15/14
Inventor 常九健谢地林王晓林方建平王晨
Owner HEFEI UNIV OF TECH