Morgan Advanced Materials’ electrical carbon business recently announced the release of its grounding brush holders, designed for stability and reliable dissipation of current to prolong bearing life. The grounding brush holders have a contact drop of less than 1 volt due to their high quality silver-graphite brush.
DC motors applied on static drive systems and AC motors on adjustable-speed drives can experience voltage spikes that can cause current to flow through the motor shaft bearings. Over time, these currents cause pitting of the bearings and eventually bearing failure.
Introducing grounding brushes to the motor to provide a low resistance path to ground, in parallel with the bearings, can eliminate this issue, without the difficulty of insulating the bearings. Most of the current can be directed through the grounding brush, greatly extending bearing life.
Shaft grounding brushes by Morgan are constructed from silver-graphite, providing low resistance. They are housed in a holder that fully supports the brush on both sides, giving it greater stability. This inexpensive device has the potential to lengthen bearing service life in a variety of applications.
Morgan’s grounding brushes and brush holders are available for purchase from Morgan Advanced Materials and its distribution partners.
Morgan Advanced Materials