When selecting the motor brush, the customer should carry out according to the specific conditions such as the magnitude of the excitation current, the pressure of the brush, the temperature and humidity of the surrounding environment, the wear of the brush and the commutator, and noise. Commonly used brush classification, what are the characteristics of each, how to use the brush? Specialized Slip Ring,Slip Ring Rotary Joint,Slip Ring Induction Motor Rotor,Induction Motor Slip Ring Dongguan Oubaibo Technology Co., Ltd. , https://www.sliproubos.com
(1) Graphite brush: The resistivity is small and the contact voltage is small.
(2) Electrochemical graphite brush: The resistivity is large and the contact resistance is large.
(3) Metal graphite brush: small resistivity and small contact voltage.
A brush with a small contact resistance has a small loss of contact voltage, and the power loss at the sliding contact point is small, causing little heat generation of the motor brush and the commutator and the slip ring. However, its commutation performance is poor, limiting the difference in additional current capability in the commutating element, that is, suppressing the sparking ability.
A brush with a large contact resistance has the opposite performance. Under normal circumstances, small motors should use graphite brushes, motors with large traction should use hard electrochemical graphite brushes, and low-voltage, high-current motors should use metal graphite brushes.