Electrical machine with permanent magnet excitation

Details Electrical machine with permanent magnet excitation Electrical machine with permanent magnet excitation

1989-07-28

1990-11-27

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 43, 310 90, 310156, 310266, 74574, H02K 524

Patent

active

049738682

ABSTRACT:
Contained in an electrical machine with a field excited by permanent magnets, on the rotor, are pole bodies that extend in ring fashion and coaxially with the rotor shaft, forming between stator pole shoes an air gap. The rotor consists of a specific sequence of permanent magnets and soft iron components which alternately are arranged side by side and jointly embedded in plastic. This gives the rotor a labile structure with a low modulus of elasticity. Apart from the present invention, the air gap could change during operation through vibrations, specifically flexural vibrations. This could lead to losses in efficiency and, most of all, considerable noise generation. A massive damping ring is provided on the free ends of the pole bodies, possibly bearing on the stator housing, which provides for a smooth running of the machine.

REFERENCES:
patent: 2418607 (1947-04-01), Suydam
patent: 3396288 (1968-08-01), Patrignani
patent: 4433260 (1984-02-01), Weisbord
patent: 4754183 (1988-06-01), Gerber

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