Short pitch alternator

Details Short pitch alternator Short pitch alternator

1976-10-20

1978-06-27

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310168, 310 68D, 322 58, H02K 2112

Patent

active

040977544

ABSTRACT:
A three-phase permanent magnet alternator is disclosed employing a fractional pitch stator winding of about two-thirds or 120 electrical degrees for minimizing third harmonic circulating current in the phase windings. The alternator has a rotor supporting permanent magnet poles and a slotted stator having coils disposed in the slots with the pitch of each coil being less than the rotor pole pitch and the coils of each phase connected in series to form a fractional pitch phase winding. The rotor circumscribes the stator and the permanent magnet poles have an arcuate extent nearly as great as the rotor pole pitch.

REFERENCES:
patent: 3219859 (1965-11-01), Terry et al.
patent: 3290525 (1966-12-01), Sudmeier
patent: 3482131 (1969-12-01), Lytle
patent: 3860843 (1975-01-01), Kawasaki et al.
Electric Machinery, Kingsley et al., McGraw-Hill, 1971, pp. 603-604.

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