A brushless DC motor including a housing having an end cap secured thereto. The housing encloses a rotor, a stator and a rotationally displaceable commutation board having sensors secured thereon and spaced around the periphery of the rotor. An external rotational force is applied to the commutation...http://www.google.de/patents/US5654599?utm_source=gb-gplus-sharePatent US5654599 - Dynamically timed electric motor
