Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-09-11
1997-09-23
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310168, 310254, 310261, H02K 1502, H02K 318
Patent
active
056708360
ABSTRACT:
A single-phase permanent magnet motor (10). A stator assembly (12) includes a stator (14) having a central bore (and a plurality of salient poles (18a-18d) extending into the bore. A rotor (13) is positioned within the bore and is rotatable relative to the stator. Stator windings (17) are used to energize the motor. A magnet (22) installed on the rotor is used to position the rotor in a stable detent or parked position to facilitate starting the motor. The magnet is a ring magnet formed on the rotor and the magnet has a plurality of magnetic ring segments (24a-24d) extending circumferentially about the ring. Each ring segment is shaped to provide a constant level of flux across the ring segment. Each stator has an indentation (36) at one end for aligning the rotor with the stator in its parked position. The result is the availability of more starting torque to start the motor than is available in other motor constructions.
REFERENCES:
patent: 3047755 (1962-07-01), Angst
patent: 3914629 (1975-10-01), Gardiner
patent: 4870358 (1989-09-01), Glaize et al.
patent: 4874975 (1989-10-01), Hertrich
patent: 5111096 (1992-05-01), Horst
patent: 5220228 (1993-06-01), Sibata
patent: 5237229 (1993-08-01), Ohishi
patent: 5260620 (1993-11-01), Morrill
Emerson Electric Co.
Stephan Steven L.
Tran Nguyen
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