Combined conductive device of motor shaft current protection structure

Abstract

The invention discloses a combined conductive device of a motor shaft current protection structure. The device comprises an electric conductor and a plurality of conductive brushes, wherein the electric conductor comprises a head part and a tail part, wherein the head part extends into an inner hole, the tail part is positioned on the outer side, the conductive brushes are fixed with the head part, the head part is rod-shaped, the plurality of conductive brushes are sequentially sleeved on the head part, and the end portion of the head part is provided with a locking structure. According to the invention,the electric conductor and the conductive brushes can be independently produced and then assembled, and the number of the conductive fibers or the number of the conductive brushes are adjusted according to the motor power, so that the conductive contact area is adjusted, and platformization and serialization are facilitated.

Description

technical field [0001] The invention belongs to the technical field of motors, and more specifically relates to a combined conductive device of a motor shaft current protection structure. Background technique [0002] Electric corrosion caused by shaft current is a common bearing failure of variable frequency motors. Due to factors such as variable frequency power supply and motor manufacturing, common mode currents and differential mode currents will be formed on the bearings when the motor is running. The method of reducing and suppressing the shaft current, in addition to adding filtering on the variable frequency power supply side to reduce the common mode voltage, the solution on the motor side is mainly from the two aspects of "blocking" and "draining". The "blocking" methods are: Insulated end caps, insulating bearings, etc. are used. The "sparse" method is to short-circuit the housing and the rotating shaft by adding grounding carbon brushes, conductive rings, auxili...

AI Technical Summary

Problems solved by technology

[0003] In the field of new energy vehicle motor applications, due to factors such as product structure and cost, insulating end caps and insulating bearings are rarely used. The use of grounding carbon brushes or conductive rings requires additional consideration of the installation space of the motor, and it is very difficult for the motor that has already been installed. Difficult to rectify

[0004] At present, in the field of new energy vehicle motors, the shaft current problem is mostly treated with a conductive ring. The conductive ring conducts electricity through the conductive fiber fixed in the ring and the shaft. Compared with the ground carbon brush, the conductive fiber has good conductivity and wear resistance. , maintenance-free and other advantages, due to the large conductive ring, it will need to increase the installation space and cost inside the motor, and it is very inconvenient for the rectification of the existing motor

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