High efficiency, low cost permanent magnet AC machine

Details High efficiency, low cost permanent magnet AC machine High efficiency, low cost permanent magnet AC machine

1982-05-25

1984-10-09

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310162, 310163, H02K 2112

Patent

active

044764081

ABSTRACT:
A high efficiency permanent magnet AC machine comprises a permanent magnet rotor mounted for rotation within a stator excited by alternating current. The rotor is formed of a cylindrical core of unitary laminations into which a squirrel cage winding is embedded. Current is induced in the winding to provide sufficient torque to accelerate the rotor from rest. Magnetic members are secured through the rotor core such that an even number of radial magnetic member segments each extend parallel to a respective quadrature machine axis. The magnetic members each generate magnetic flux which is directed parallel to a respective direct axis and perpendicular to a respective quadrature axis of the machine. As the rotor accelerates to synchronous speed, rotor flux interacts with stator flux causing the rotor to synchronize with the rotating stator field, thus allowing the machine to achieve synchronous machine performance.

REFERENCES:
patent: 3492520 (1970-01-01), Yates
patent: 3840763 (1974-10-01), Baumann et al.
patent: 4139790 (1979-02-01), Steen

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