Electric motor and carbon brush assembly used therefor

Abstract

This invention relates to an electric motor and a carbon brush assembly used therefore. The carbon brush assembly comprises: a carbon brush having a first tail end and a second tail end, the first tail end being used for slidably contacting with a commutator of a motor; a carbon brush case for mounting the carbon brush and guiding the carbon brush to move; the carbon brush case comprising a first end part and a second end part; the first end part of the carbon brush being close to the first tail end of the carbon brush as well as the second end part being far away from the first tail end of the carbon brush; a constant-force spring having two curling parts and a connecting part for connecting two curling parts, the connecting part being resisted against the second tail end of the carbon brush; the tail end of the curling part forming a wound roll structure; two sides of the first end part of the carbon brush case being provided with a hanger, respectively; the wound roll structure being hanged on the corresponding hanger, respectively; the part of the curling part located between the tail end and the connecting part being straightened. The carbon brush assembly provided by this invention can avoid the short circuit due to the falling of the spring from the carbon brush case because the hanger on the carbon brush case can fix the spring when the carbon brush is assembled and the service life will finished.

Description

technical field [0001] The invention relates to a motor, in particular to a carbon brush assembly of the motor. Background technique [0002] The application of brushed motors has been quite common, such as DC motors and general motors. A carbon brush box is usually used to install carbon brushes therein and guide the carbon brushes into contact with the commutator to transmit current from the carbon brushes to the commutator. A spring is usually installed in the carbon brush box to provide elastic force to the carbon brush to ensure the contact between the carbon brush and the commutator. Since the service life of the carbon brush is directly related to the service life of the motor, the carbon brush will be made as long as possible. This requires that when the carbon brush is from the initial state (the carbon brush is new) to the end of life state (the carbon brush is almost used up), the spring must always provide a predetermined elastic force to the carbon brush to en...

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Problems solved by technology

[0004] However, the constant force spring in the above solution is easy to fall off from the carbon brush box when the carbon brush is assembled and at the end of its life, causing a short circuit inside the motor, which is very dangerous in a high-voltage motor

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