Rail carbon brush device of brush motor

Abstract

The invention provides a rail carbon brush device of a brush motor, which comprises a carbon brush substrate (16) and at least two carbon brush components (17), wherein the carbon brush substrate (16) is an isolator and is used for supporting the carbon brush components (17); each carbon brush component (17) comprises a carbon brush (20), an elastic piece (30) and a pair of guide rails (36) fixedon the carbon brush substrate (16); a concave chute (21) is formed on the opposite surfaces of the carbon brush respectively and is arranged on the guide rails (36); the end of the elastic piece (30)is connected to the carbon brush (20) and the elastic piece (30) elastically drives the carbon brush (20) to slide to a motor commutator along the guide rails (36); the guide rails (36) consist of edges of rigid guide plates (35); and the guide plates (35) are substantially parallel to the carbon brush substrate (16) and are fixed on the carbon brush substrate (16). In the rail carbon brush device of the invention, the carbon brush can be stably supported by the rails and can be exposed in the air to the largest extent so as to conveniently dissipate heat.

Description

technical field [0001] The invention relates to the field of brushed motors, in particular to a rail carbon brush device of a permanent magnet direct current (PMDC) brushed motor. Background technique [0002] The tracked carbon brush device includes carbon brushes and a pair of guide rails, and the opposite two sides of the carbon brushes have slide grooves. The guide rail is located in the chute, so that the carbon brush can slide along the guide rail to the commutator of the motor, and is in frictional contact with the commutator under the action of the spring. US patents US4,559,465 and US6,020,668 disclose this type of guide rail carbon brush device. [0003] The tracked carbon brush device provided by US Pat. No. 4,559,465 includes a guide rail, a carbon brush with a chute, and a carbon brush substrate for fixing the guide rail. The guide rail and the carbon brush substrate are both plastic parts, and the two are integrated into one. The disadvantage of this carbon b...

AI Technical Summary

Problems solved by technology

In this scheme, more metal materials are used, which increases the cost

In addition, the metal guide rail is fixed to the end cover through a rubber washer. The rubber washer plays the role of electrical insulation and absorbs the vibration of the carbon brush. However, this elastic rubber washer makes the carbon brush vibrate, and the instability of the carbon brush will cause the motor to run. increased electrical noise

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