Ventilation cooling structure of fully-enclosed permanent-magnet motor

Abstract

The invention proposes a ventilation cooling structure of a fully-enclosed permanent-magnet motor. The ventilation cooling structure comprises a shell, a front end cover, a rear end cover, a stator structure and a rotor structure, wherein the rotor structure comprises a rotation shaft and a rotor core, the rotor core is fixedly assembled at a middle part of an outer side surface of the rotation shaft, the stator structure comprises a stator core and a stator winding, the stator winding is wound around the stator core, a plurality of cooling fin structures are uniformly arranged on a peripheralsurface of the stator core, the stator structure also comprises a plurality of pull plates corresponding to the fin structures, the shell is of an arc structure with a plurality of segments, and thepull plates, the fin structures and the shell are sealed to form an axial ventilation passage penetrating through two ends of the shell. By arranging the cooling fin structures in the cooling ventilation passage, external air enters the cooling ventilation passage through a radial air inlet, larger and more obvious turbulence is generated by fin stirring, and more heat is taken away.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a fully enclosed ventilation and cooling structure for permanent magnet motors. Background technique [0002] A permanent magnet motor is a DC motor with a magnetic field established by one or more permanent magnets, which does not require electrical excitation of the rotor magnetic field. Since the permanent magnet has the characteristic of magnetically absorbing impurities easily, the motor needs to prevent foreign matter such as dust, water, acid and alkali from entering the interior of the motor and damaging the permanent magnet. Especially for permanent magnet motors for rail transit, in order to prevent the metal powder produced by the friction between the wheels and rails from entering the motor and adsorbing on the rotor surface of the permanent magnet motor when the rail vehicle is running, the air gap between the stator and rotor of the motor becomes smaller or even the ...

AI Technical Summary

Problems solved by technology

This kind of ventilation and cooling structure has the problem that the turbulent flow in the ventilation channel is not obvious, and the heat taken away by the cooling air is limited, resulting in a high temperature rise of the motor and limited heat dissipation capacity.

At the same time, due to the adsorption characteristics of the permanent magnet of the rotor, iron powder and iron filings in the cooling air are easily adsorbed on the surface of the rotor, which can easily cause air gap blockage, rotor sweeping and other faults, causing damage to the rotor structure and affecting the operation of the permanent magnet rotor. reliability

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