THERMIC OVERLOAD PROTECTION FOR A COMMUTATOR OR SLIPRING-MOTOR

摘要

The device has the shape memory alloy part (2-5) responding at a given temp. to raise the brushes (6-9) from the slipping or commutator (1). The brush support arm may be made of shape memory alloy whose one end acts as lifting part fixed to a brush support plate (16) and whose second end acts as a spring (21). The spring end presses the brush against the ring or commutator. Alternatively the shape memory alloy may be a separate part altogether or yet again it may be just one part of the brush holding system. A variety of configurations are possible.