Direct current motor

Abstract

The invention relates to the technical field of motors, in particular to a direct-current motor which comprises a base, a shell is fixedly connected to the center of the outer surface of the upper end of the base, uniformly-distributed heat dissipation holes are formed in the inner wall of the shell in a penetrating mode, an electric box is fixedly connected to the upper end of the outer surface of the shell, and a sliding cylinder is slidably connected to the inner wall of the shell. Rectangular holes which are evenly distributed are formed in the outer surface of the sliding barrel in a penetrating mode, a connecting block is fixedly connected to the upper end of the outer circle face of the sliding barrel, and the upper end of the connecting block extends into the electric box. According to the invention, after the temperature in the motor rises, a first memory spring pushes a connecting block to move, so that a sliding cylinder is driven to rotate to open heat dissipation holes, the shell is hollowed out, the heat dissipation effect of the motor is improved, and after the motor is cooled, the first memory spring pulls the connecting block to enable the sliding cylinder to close the heat dissipation holes, so that the heat dissipation effect of the motor is improved. And the problem that foreign matters enter the shell to influence the work of the motor because the heat dissipation holes are in an open state for a long time is avoided.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a DC motor. Background technique [0002] DC motor is a motor that converts DC electric energy into mechanical energy. It is widely used in electric drive because of its good speed regulation performance. It is divided into three types: parallel excitation, series excitation and compound excitation. [0003] A Chinese patent discloses a DC motor stator assembly. The patent application number is CN202021491729. A DC motor stator assembly belongs to the technical field of DC motor stator assemblies and includes a casing. The surface of the casing is provided with an air suction port and the air suction port is uniform at four points. Distributed on the shell, the inner wall of the suction port is equipped with a filter screen, the inner wall of the shell is equipped with winding rods and there are four winding rods, the surface of the shell is installed with protruding blocks, and ...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patents provide air suction ports and ventilation holes on the casing of the DC motor to dissipate the heat generated by the motor during operation. Although a filter is installed, the ventilation ports and suction ports are in an open state for a long time, and some are smaller than the filter mesh. Impurities in the motor will inevitably enter the motor and cause damage to the motor. In addition, when the motor is seriously heated, there is no alarm and protection for the motor.

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