Collector ring series of synchronous motor and induction motor using the collector ring machine, is widely used in industrial sectors, and, most are operating in a variety of harsh conditions. Although these motors without the reversing effect of dc motor, but with the commutator, also appear abnormal wear on the collector ring and brush, brush vibration and produce sparks.
Collector ring material requirements of the mechanical strength, and is a good conductor of electricity, but also has corrosion resistance, with the brush sliding contact, must be able to wear resistance and stability of the sliding contact characteristics. Generally, steel collector ring good abrasion resistance, mechanical strength, so that most larger collector ring wear difference caused by polarity used synchronous motor.