Surface Seating of Carbon Brush Contact

Date: 2018-12-14 15:48:42

      The process of seating refers to the idea of matching the contact surface of the commutator ring and the brush effectively. This is done to bring a correct surface roughness for both the slip ring and brush into the operational setup. Also, with introducing the correct state of roughness, the quality of not just the mechanical sliding contact but also the electrical contact bolsters.



      The sliding contact between the slip ring and the carbon brush is an integral part of the proper functioning of the slip ring. The basic purpose of the slip ring is to transmit electrical and power signals. However, the various other kinds of signals can also be transmitted according to the requirement of the equipment. Thus, it becomes essential to maintain a carbon brush for proper sliding contact.

      The crucial part of auguring equality of the brush and increasing the effectiveness of the contact is the surface setting of the brush contact. Here, we will be discussing some of the aspects, which need to be taken into account for getting the brush setting accurate to the “T”.

Aspects to be considered for proper carbon brush contact surface


      Generally, the speed of the rotation of the slip ring depends on the set of equipment in which it is applied. But, in cases when the peripheral speed of rotation of the slip ring is high, special care must be taken to the brush contact surface seating.



      In most of the modern equipment, due to the space crunch, the inner radius of the slip ring is smaller than an orthodox set of slip rings. The diameter of the ring decreases further when we take the split ring into account. This results in the excess load being transferred to the midsection or the commutators middle wafer.

      The transfer of excess current load occurs primarily due to the effect that smaller diameter ring has on the surface seating. Quite naturally, with the smaller diameter of the inner ring, there is a poor surface contact between the brush and the ring.



Solution to Carbon brush seating

      As we have earlier established that smaller diameter of the inner ring leads to a disruption in maintaining a correct pattern of surface seating, every slip ring manufacturer has come up with an effective solution. In case of slip rings with a smaller inner diameter, the brush seating can be established by grinding wheels, which have the diameter equal to the one on the conductive ring.

      The above method is quite popular in the case of large-scale production series of the similar type of motors. Also, the use of the carbon holder is essential too as while performing the process of seating, the carbon brush must bond perfectly with the grinding wheel not just manually but with the holders. Thus, this would solve the problem of surface seating of carbon brush contact.

Reference Parts# of Slip Rings as below:
Slip Ring Connectors | Rotating Electrical Connectors | Electrical Slip Rings
Rotating Electrical Connectors
ME2121 seriesCEthernet Slip Rings
How to design thermocouple slip ring?
Install instruction -Pneumatic hybrid style
MB500 series IndustrialBus Slip Rings

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