Abstract: A commutating brush assembly for rotating electrical equipment is constructed to suppress electromagnetic/radio frequency interference emissions, particularly in the radio frequency range. This is achieved by fabricating the EMI/RFI suppressing brush holder assembly from a material that itself suppresses EMI/RFI emissions generated by electromagnetic apparatus such as motors, generators, rotary switch gears, etc. The EMI/RFI emission suppression capability of the novel assembly may be further enhanced by the addition of certain add-on electrical components such as capacitors or radio frequency choke coils and the like.

Abstract: A brush holder plate assembly comprising a brush holder plate fabricated from electrically insulating thermoplastic material and having a plurality of sets of spaced-apart, parallel, raised guiding and support rails integrally formed on one surface of the plate. The plate further has a centrally formed aperture of sufficient cross sectional dimension to be slipped over the commutator of an electric machine after complete assembly of all the parts of the machine. The sets of spaced-apart, parallel, raised guiding and support rails project radially outward away from the centrally formed aperture like the spokes of a wheel. A plurality of snap-in-place, brush holder cartridges are removably secured by slide catches to the respective sets of spaced-apart parallel raised guiding and support rails for physically supporting commutating brushes in an array surrounding the commutator of the electric machine with one exposed end of each brush in physical and electrical contact with the commutator.