A motor assembly including a housing with a motor portion having an opening for receiving a motor housing/stator assembly, rotor assembly, front and rear end caps and bearings, an encoder coupled to the motor, and an rear cover for enclosing the opening of the motor portion of the housing, the rear cover at least partially surrounding the encoder. At least one of an interior surface of the rear cover or an exterior surface of the encoder comprise a material having an emissivity greater than 0.9.