Regulatable permanent magnet alternator

Details Regulatable permanent magnet alternator Regulatable permanent magnet alternator

1986-11-24

1988-08-23

Hickey, R. J.

Electricity: single generator systems

Generator control

Magnetic structure

310 90, 322 29, 322 51, H02K 2114

Patent

active

047663626

ABSTRACT:
The present invention provides an improved alternator system in which the magnetic flux modulating sleeve is carried by the rotor and rotates with the rotor. The position of the sleeve on the rotor is adapted to be adjusted during operation of the alternator while the rotor and sleeve are rotating. The repositioning of the sleeve on the rotor during rotation beneficially provides a more constant voltage output during load and speed variations. Concurrent rotor and sleeve rotation reduces eddy current losses in the magnetic circuit and increases alternator efficiency. The alternator of the invention is estimated to provide a constant voltage for a 10:1 variation in either electrical load (in OHMS) or rotor angular velocity (revolutions per minute, RPM), or a combined 10:1 variation of electrical load and rotor angular velocity.

REFERENCES:
patent: 2336759 (1943-12-01), Stearns
patent: 4027229 (1977-05-01), Frink
patent: 4278907 (1981-07-01), Landgraf et al.
patent: 4305031 (1981-12-01), Wharton

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