Electricity: motive power systems – Motor structure adjustment or control
Patent
1991-09-18
1992-12-01
Ro, Bentsu
Electricity: motive power systems
Motor structure adjustment or control
310172, H02K 2344
Patent
active
051682010
ABSTRACT:
A shifting-field type permanent-magnet motor includes a stator having a stator core, a shading coil and a multiple-layer coil assembly; a control unit for starting the motor and a control unit for free-running the motor for sequentially changing over the multiple-layer coils; and operating-mode changeover means for changing over from a starting operation to a free-running operation. The stator core has a generally donut-shaped main body, a plurality of protruding magnetic poles formed radially on both surfaces of the main body at a pitch of 45.degree., and radially drilled holes having a predetermined width in the circumferential direction. The shading coil has an inner ring arranged on an inner peripheral surface of the main body, an outer ring arranged on an outer peripheral surface of the main body, and connecting wires for connecting the inner ring and outer ring so as to interlink the protruding magnetic poles. The multiple-layer coil assembly is provided with a first coil wound while successively changing the winding direction, a second coil offset from the first coil by the pitch of 45.degree., a third coil offset from the second coil by the pitch of 45.degree., and a fourth coil offset from the third coil by the pitch of 45.degree.. Rotors having permanent magnets of alternately different polarity at the pitch of 90.degree. are arranged to oppose both sides of the stator.
REFERENCES:
patent: 3046461 (1962-07-01), Luppold
patent: 3153754 (1964-10-01), McDonald
patent: 4251761 (1981-02-01), Williams
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