Permanent magnet DC machine

Details Permanent magnet DC machine Permanent magnet DC machine

1989-03-23

1990-04-03

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 43, 310 91, 310258, H02K 2304

Patent

active

049143344

ABSTRACT:
A permanent magnet DC machine comprising a rotor and a stator diametrically opposed to the rotor through a fine air gap therebetween. The stator comprises a yoke, main magnetic poles of anisotropic permanent magnet provided on an inner circumferential surface of the yoke and auxiliary magnetic poles provided respectively adjacent to the main magnetic poles side by side, each of the auxiliary magnetic pole being made of a material having higher reversible permeability than said permanent magnet. Each pair of the main and auxiliary magnetic poles are arranged so that they are in contact with each other at a radially inner portion of the magnetic poles and are separated from each other at a radially outer side of the magnetic poles to thereby form a magnetic leakage-path breaking air gap portion therebetween. A circumferential length of the air gap portion at the radially outer side is larger than a radial distance of said fine air gap and a nonmagnetic member is provided in the air gap portion to prevent the leakage of magnetic flux.

REFERENCES:
patent: 3594599 (1971-07-01), West
patent: 4458184 (1984-07-01), Kawate
patent: 4491756 (1985-01-01), Tomite
patent: 4570093 (1986-02-01), Morii et al.
patent: 4580072 (1986-04-01), Morishita
patent: 4639625 (1987-01-01), Abukawa et al.
patent: 4774426 (1988-09-01), Mohr et al.
patent: 4783608 (1988-11-01), Gruber et al.
patent: 4794291 (1988-12-01), Abukawa et al.

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