Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-09-03
1998-09-15
LaBalle, Layton E.
Electrical generator or motor structure
Dynamoelectric
Rotary
310168, 310 68B, 318701, H02K 1732, H02K 1100, H02P 146
Patent
active
058083898
ABSTRACT:
An apparatus and method for starting a single-phase variable reluctance motor defined by a stator having one or more pairs of projecting poles defining a principal axis and a rotor mounted on a rotatable shaft co-axial with the principal axis of the stator is provided. The apparatus includes a device for preventing the rotor from being halted in a position of zero-developed torque thereby enabling reliable starting of the motor. The device includes a vane defined by a ferromagnetic disk having alternating mark regions and space regions which is mounted to the rotatable shaft and may form part of a rotor position transducer. A permanent magnet is positioned so as to move the vane into a position at which starting torque of the desired direction will be developed when the motor is energized. A further embodiment combines the magnet with a Hall-effect sensor so that, in conjunction with the vane, a rotor position transducer is formed.
REFERENCES:
patent: 1259295 (1918-03-01), Rosenberg
patent: 2790124 (1957-04-01), Eisele
patent: 3581183 (1971-05-01), Piazza et al.
patent: 4364005 (1982-12-01), Kohzai et al.
patent: 4442392 (1984-04-01), Hore
LaBalle Layton E.
Switched Reluctance Drives Ltd.
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