Introduction of slip rings for motors

The collector ring is also called conductive ring, slip ring, collector ring, collector ring, etc. It can be used in any electromechanical system that requires continuous rotation while transmitting power and signals from a fixed position to a rotating position. The slip ring can improve the system performance, simplify the system structure, and avoid the sprain of the wire during the rotation process. The conductive slip ring of Yingzhi Technology solves this problem.

Synchronous motors and asynchronous motors that use slip rings are widely used in industrial sectors, and most of them operate under various harsh conditions.

Although these motors do not have the same commutation effect as DC motors, but like commutators, they also suffer from abnormal wear of collector rings or brushes, brush vibrations and sparks. Especially in terms of brush material, not only graphite brushes are used for collector ring brushes, but also metal graphite brushes are sometimes used in order to increase the current density of the brushes. Therefore, factors such as abnormal residual expansion must also be considered. Even for high-speed motors such as turbo-generators or motors operating in fully enclosed gaseous and hydrogen media, there are many problems.

The material of the collector ring requires high mechanical strength, good electrical conductor, and corrosion resistance. When sliding in contact with the brush, it must have wear resistance and stable sliding contact characteristics. In general, steel collector rings have good wear resistance and high mechanical strength, so they are mostly used in synchronous motors with a large difference in collector ring wear caused by polarity.

Generally, the steel collector ring has good wear resistance and high mechanical strength, so it is mostly used in synchronous motors with a large difference in collector ring wear caused by polarity. Steel can be machined into complex structures, and it is a readily available and inexpensive material, and is therefore widely used in synchronous motors including hydroelectric generators with low peripheral speeds.
For the collector ring, which mainly emphasizes the mechanical strength and wear resistance at high peripheral speed, like the turbogenerator, forged steel is sometimes used. In addition, when corrosion resistance is required, stainless steel can be used, but the sliding characteristics of stainless steel are unstable, and the improper combination with the brush will cause the brush to jump, which is likely to cause excessive temperature rise or abnormal wear of the brush, so it must be doubled when used. Notice.
Compared with steel collector rings, copper collector rings such as bronze castings have better sliding properties, so they are widely used. The collector rings are worn or the brushes are worn abnormally.
In the cooperation between the collector ring and the brush, when the abrasiveness of the brush is too strong and the material of the collector ring is too soft, step wear equivalent to the width of the brush often occurs on the collector ring. Especially for fully enclosed motors with high temperature and low humidity, it is more likely to cause excessive wear of brushes or collector rings. The ghost scars are formed in this way. There are only very small scars at the beginning, and the brushes have poor current collection in these parts and sparks are generated. Once a spark is generated, the scar will gradually deteriorate and expand, and finally a scar with the same size as the sliding contact surface of the brush is formed. Therefore, even if the brushes for the slip rings generate very small sparks, care must be taken.
In order to prevent serious ghosting scars on the steel collector ring, the brush should be lifted when the motor stops for a long time. In order to improve the current distribution of the parallel brushes, the energization point of the sliding contact surface of the slip ring can be moved. In order to obtain good sliding characteristics, it is effective to form a helical chute on the slip ring.

Post time: Sep-08-2022