DC brushless motor having auxiliary salient poles

Details DC brushless motor having auxiliary salient poles DC brushless motor having auxiliary salient poles

1996-03-22

1998-12-01

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310261, 310264, 310269, 310254, 310186, H02K 108, H02K 122

Patent

active

058443444

ABSTRACT:
A DC brushless motor 3 is provided which comprises armature 31 and rotor 32. Rotor 32 is provided with a rotor yoke that has four main poles 321 on its periphery. Slots with a radial-direction size of L.sub.m are formed on main poles 321 of the rotor yoke. Magnetic-field permanent magnet 323 with an approximate thickness of L.sub.m is embedded in each slot 322, such that the radial-direction size L.sub.m of slot 322 and the air gap length L.sub.g of the air gap formed between rotor 32 and armature 31 satisfy the relationship 0<L.sub.m +L.sub.g .ltoreq.2 mm.

REFERENCES:
patent: 4649331 (1987-03-01), Jahns
patent: 4939398 (1990-07-01), Lloyd
patent: 4954736 (1990-09-01), Kawamoto et al.
patent: 5006745 (1991-04-01), Nishio et al.
patent: 5041749 (1991-08-01), Gaser et al.
patent: 5083054 (1992-01-01), Tomite et al.
patent: 5095238 (1992-03-01), Suzuki et al.
patent: 5508576 (1996-04-01), Nagate et al.

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