Synchronous electrical machine with permanent magnet excitation

Details Synchronous electrical machine with permanent magnet excitation Synchronous electrical machine with permanent magnet excitation

1986-03-21

1987-06-30

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 2112

Patent

active

046773312

ABSTRACT:
To keep the voltage rating of the components of a static converter as low as possible, the permanent magnets of a permanent magnetically excited converter-fed synchronous motor with a preferred direction of rotation which are mounted on circumferential surface of the soft-magnetic part of the rotor have a thickness which, along the line of the magnetization, increases from a first entering edge to the other leaving edge of the permant magnet with the thickness at the first edge being nearly zero. The magnetic air gap increases from said first edge to the adjoining pole gap. The supply currents having rectangular time patterns are controlled in accordance with the position of the rotor so that the electrical loading is routed only along the q axis.

REFERENCES:
patent: 2601517 (1952-06-01), Hammes
patent: 3054916 (1962-09-01), Cobb
patent: 3078381 (1963-02-01), Volkrodt
patent: 3124733 (1964-03-01), Andrews
patent: 3169203 (1965-02-01), Lavin et al.
patent: 4459500 (1984-07-01), Miyamoto
Patent Abstracts of Japan, vol. 4, No. 83 (E-15) (565) Jun. 14, 1980.
IEEE Transactions on Magnetics, vol. Mag-20, No. 5, Sep. 1984 Weh, Moseback & May "Design Concepts and Force Generation in Inverter-Fed Synchronous Machines with Permanent Magnet Excitation".
Patent Abstracts of Japan vol. 4, No. 83 (E-15) (565) Jun. 14, 1980 Etz Vol. 100, Issue 24 (1979), pp. 1382-1386 Grotstollen & Pfaff "Buerstenloser Drehstrom-Servoantrieb mit Erreguag durch Dauermagnete".

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