Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1977-06-01
1979-10-02
Rubinson, Gene Z.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318254, H02K 2900
Patent
active
041699904
ABSTRACT:
A brushless DC motor is constructed with photosensitive device for detecting rotor shaft position. Arcuate permanent magnets on the rotor provide a DC flux field while distributed stationary armature windings, each spanning a fixed number of slots in the armature assembly, provide mutually perpendicular magnetic fields. A logic circuit comprising NOR gates and transistor switches and drivers activated in response to signals from the shaft position sensors are utilized to control current switching in the armature windings of the motor. A light interrupting shutter mounted to the rotor cooperates with the light sensitive devices which are mounted to a supporting bracket fixed to the stationary armature assembly in a manner to selectively preset advancement of commutation of the armature windings. Variations on permanent magnet rotor construction and novel applications of a brushless DC motor are also disclosed as is a novel approach for dispensing with the mechanism for detecting the shaft position. In this last respect a commutating circuit is disclosed for a brushless DC motor, including a detecting circuit responsive to the electromotive force (emf) of the brushless DC motor to provide a simulated signal indicative of the rotation of the motor's shaft and a logic circuit responds to the output of the shaft position detecting circuit to control the application of driving signals through the armature windings of the DC brushless motor.
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General Electric Company
Krisher, Jr. Ralph E.
Lowe A. Burgess
Rubinson Gene Z.
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