Synchronous motor

Details Synchronous motor Synchronous motor

1977-06-22

1980-06-03

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310112, 310114, 310162, H02K 3717

Patent

active

042063744

ABSTRACT:
A synchronous motor, in particular a stepping motor, with two coaxial stator sections which are each provided with a ring coil and with two circular systems of teeth, which are shifted by half a tooth pitch relative to each other. The two stator sections are shifted by a quarter tooth pitch relative to each other. In addition, the motor comprises an axially magnetized permanent-magnetic ring which is disposed between the two stator systems, for magnetizing the two systems of teeth of the stator sections with mutually the same polarity. The two systems of teeth of each stator section are constituted by annular parts which are provided with teeth at the inner circumference. The annular parts form part of the magnetic circuit which surrounds the annular coil and are disposed concentrically in such a way that the axial distance between the teeth of both systems is at least a few times greater than the air gap between stator and rotor.

REFERENCES:
patent: 2796571 (1957-06-01), Dunn
patent: 3343014 (1967-09-01), Giles
patent: 3401322 (1968-09-01), O'Regan
patent: 3878414 (1975-04-01), Harakawa
patent: 3950663 (1976-04-01), Mead

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