Brushed direct-current motor

Abstract

The invention relates to a brushed direct-current motor, which comprises a stator and a rotor. The stator comprises a plurality of windings and a stator magnetically-conductive salient pole core. The rotor comprises a rotor magnetically-conductive salient pole core and two mutually insulated reversing devices, wherein each reversing device comprises electrically-conductive parts and a plurality of reversing parts. The stator further comprises two first electric brushes and a plurality of second electric brushes, wherein the first electric brushes are connected with one electrode of a power supply through a select switch and is in sliding contact with the two electrically-conductive parts respectively; the second electric brushes are connected with the windings respectively; the other end of each winding is connected with the other electrode of the power supply; the select switch selectively conducts one of the two first electric brushes to one electrode of the power supply, so that the motor can rotate in one of two opposite directions; and the second electric brushes are in sliding contact with the reversing parts so as to alternately provide single-polarity electric excitation for each winding. According to the brushed direct-current motor provided by the invention, the windings are arranged on the stator and no magnet is arranged on the rotor, so that the brushed direct-current motor is firm; and the windings adopt a single-polarity excitation mode, so that fewer electric brushes are needed and the reversing devices have simple structures.

Description

technical field [0001] The invention relates to a brushed motor, in particular to a brushed DC motor. Background technique [0002] In the existing brushed DC motor, the rotor usually includes a commutator and a winding electrically connected to the commutator, the stator usually includes a permanent magnet opposite to the rotor winding and a brush in sliding contact with the commutator, and the winding passes through the commutator and brushes are connected to the power supply. [0003] However, in this brushed DC motor, the winding is arranged on the rotor, and the rotor winding rotates at a high speed, so the mechanical characteristics are poor; moreover, the winding usually uses copper wire, which is not suitable for using a wire with poor strength such as aluminum wire. [0004] The invention aims to provide a novel brushed DC motor with static winding, no magnet salient core and rotating rotor. Contents of the invention [0005] The invention provides a brushed dir...

AI Technical Summary

Problems solved by technology

[0003] However, in this brushed DC motor, the winding is arranged on the rotor, and the rotor winding rotates at a high speed, so the mechanical characteristics are poor; moreover, the winding usually uses copper wire, which is not suitable for using weaker wires such as aluminum wire

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