Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1979-03-05
1981-07-14
Truhe, J. V.
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318689, 318648, 318649, H02P 736
Patent
active
042789273
ABSTRACT:
An axial gap, permanent magnet motor. The motor includes a stator affixed to a motor housing. The stator has two sets of series connected coils wound in quadrature. Each set of coils is disposed in an annular configuration about a spin reference axis, with the principal axis of each coil being substantially parallel to the reference axis. The motor further includes a rotor which is adapted for continuous rotation about a spin axis. The rotor includes a set of permanent magnets and a member for supporting the magnets in a substantially annular configuration about the spin axis. The magnetic moment of each of the magnets is substantially parallel to the spin axis, with the magnetic moment of adjacent magnets being oppositely directed. The rotor is positioned with respect to the stator with the configuration of magnets being adjacent to the configuration of coils so that flux from the magnets is coupled to the coils. The rotor also includes a return ring for establishing a magnetic flux return path for completing a circuitous path for flux passing through the coil. An excitation network for the coils detects back emf in the respective coils, and in response thereto, generates control signals for driving alternating currents in the respective sets of coils. The alternating currents have a 90.degree. relative phase shift and are in phase with the detected back emf for the respective sets of coils.
REFERENCES:
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patent: 3611815 (1971-10-01), Fischell
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patent: 4000660 (1977-01-01), Brodersen
patent: 4072874 (1978-02-01), Arnold, Jr.
Fulton, "Development of Back EMF Control Electronics for a PM Gyro Wheel", Jun. 1976.
Indyk Eugene S.
Northrop Corporation
Truhe J. V.
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