Patent ID: 6300739
Filing Date: 2001-10-09
Classification: H02K,H05K

Abstract:
An improved limited angle torque DC brushless servomotor for mounting in a housing adapted for receiving and supporting the servomotor, the servomotor including a hollow cylindrical stator having embedded permanent magnets and a rotor having winding coils and commutator with a plurality of commutator segments mounted concentrically on a rotor shaft along the longitudinal rotor axis, the improvement comprising:a controller operatively associated with the rotor for rotating the rotor in a controlled limited angular fashion about the longitudinal rotor axis in response to an external rotor shaft angular displacement command signal;a sensor coupled to the housing for sensing the limited angular rotation of the rotor about the longitudinal rotor axis, said sensor producing a feedback signal representative of the rotor shaft angular displacement from a predetermined rotor shaft angular null position; anda circuit for electrically coupling said controller to the commutator and said sensor to said controller, said controller receiving and comparing said feedback signal with said external rotor shaft angular displacement command signal and generating a corresponding rotor motion control error signal, said controller communicating said rotor motion control error signal to the commutator to control the limited angular rotation of the rotor about the longitudinal rotor axis, said circuit having at least one portion flexing in consonance with the controlled limited angular rotation of the rotor about the longitudinal rotor axis during motor operation.