Permanent magnet DC motor

Abstract

The invention discloses a permanent magnet DC motor, which comprises a stator and a rotor. The rotor is provided with a reverser. The stator comprises a stand, a magnetic shoe and an electric brush component, wherein the magnetic shoe is fixed on the stand; the electric brush component is arranged on the stand and used together with the reverser, and comprises two electric brushes connected with wire harnesses and an insulated brush holder yoke; the brush holder yoke comprises a brush holder base and two brush holders integrated with the brush holder base; a through hole for accommodating the reverser and a fixing hole for fixedly arranging the brush holder yoke on the stand are reserved on the brush holder base; an electric brush spring is arranged in the brush holder; and each electric brush is arranged in corresponding brush holders in a sliding way, and is elastically pressed against the reverser by the elasticity of a corresponding electric brush spring. The electric brush component of the permanent magnet DC motor has fewer parts, low cost and simple structure, is convenient to assemble, and can effectively ensure the accuracy of an angle between the two electric brushes, thereby improving the working efficiency and rotating stability of the motor and reducing noise pollutions.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a permanent magnet DC motor used in automobiles to drive fans to dissipate heat from automobile engines. Background technique [0002] In the car, it is necessary to use a DC motor to drive the fan to rotate, so as to dissipate heat from the car engine. The current DC motor generally includes a stator and a rotor. The rotor includes a rotor shaft, an armature core and an armature winding. A commutator is installed on the end of the rotor shaft. The tile and the brush assembly installed on the frame and used in conjunction with the commutator, the current brush assembly generally includes an insulating pad and two copper brush holders, the insulating pad is installed on the frame, the insulating pad and There is also insulating paper between the machine bases, the copper brush handle is provided with clamping feet, and the insulating pad is provided with mounting holes matching th...

AI Technical Summary

Problems solved by technology

Due to the many parts of the brush assembly, this kind of DC motor has a complex structure, high cost, and inconvenient installation, especially the installation and coordination between various parts are prone to installation errors. The superposition of this installation error will cause two brush holders The angle between them is not accurate, so that the working efficiency of the motor is reduced, the stability of the motor rotation is not good, and when the motor drives the fan to rotate, it will generate noise and cause noise pollution.

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