Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1976-09-17
1978-02-07
Hohauser, Herman J.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
310156, 310233, 310268, H02K 2900
Patent
active
040728811
ABSTRACT:
An axial-air-gap type semiconductor motor has a disc-shaped rotor, a pair of disc-shaped armatures coaxially located adjacent the opposite faces of the rotor with air-gaps therebetween, a system for detecting the rotational position of the rotor for generating an output proportional to the rotating speed of the rotor, and a semiconductor circuit operable in response to the output from the position-detecting system for controlling the armature current to effect constant-speed control of the rotation of the rotor. The rotor includes a field magnet. Two groups of armature coils are mounted on the face of each of the armature discs facing the rotor. The position-detecting system includes a control band which includes a plurality of control sections and which is synchronously rotatable with the rotor, and detectors which are located at fixed positions along the control band for generating an output in response to the control sections of the control band. The control band may be provided integrally around the periphery of the rotor.
Induction coils are provided, each being affixed to the central portion of each of the armature coils. The induction coils generate a three-phase output proportional to the rotating speed of the rotor. The output from the induction coils is rectified by a rectifying circuit and is applied to the current control circuit to provide a constant-speed control for the rotor.
REFERENCES:
patent: 3437897 (1969-04-01), Lenny
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