Siemens Canada Limited

Haran K Periyanthamby

Marek Horski

Peter A Kershaw

An ultra quiet electric motor includes a drive shaft, bearing structure rotatably supporting the drive shaft, and an armature assembly and commutator each fixed on the drive shaft. A motor housing is disposed around the armature assembly and has an open end portion. A permanent magnet structure is disposed between the motor housing and the armature. Brush structure is provided having a pair of brush support arms each guiding a generally crescent-shaped brush. Each of the brushes contacts the commutator. A noise absorbing housing is defined by a plurality of walls and is disposed generally around the brush structure. Noise absorption material covers at least a portion of at least one of the walls of the noise absorbing housing. An end cap is fixed to the motor housing to close the open end portion thereof. The structure of the motor is such that during operation, a decibel rating of approximately 32 dbA is generated.

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London, Canada

Haran K Periyanthamby