Permanent magnet stepping motor

Details Permanent magnet stepping motor Permanent magnet stepping motor

1993-04-20

1995-01-31

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, H02K 3714

Patent

active

053861612

ABSTRACT:
The invention relates to a structure of a three-phase permanent magnet stepping motor in which vibration and noise can be reduced and lowering of its output can suppressed even in a high-pulse region. To this end, the motor has a three-phase, six-pole, permanent magnet stator structure, and a rotor structure having alternately arranged N and S poles the total number P of which is selected to satisfy the conditional equation of P=12n.+-.4 (n being a positive integer).
The present invention is applicable to both the inner-rotor and outer-rotor structures. Further, in both the cases of the inner- and outer-rotor structures, the alternate arrangement of N and S magnetic poles of the rotor may be realized by an arrangement using a two-pole magnetized permanent magnet constituted by a combination of two claw poles, in place of the arrangement in which N and S magnetic poles are formed by directly magnetizing the outer or inner circumferential surface of a cylindrical magnet.

REFERENCES:
patent: 4381465 (1983-04-01), Renkl et al.
patent: 4672253 (1987-06-01), Tajima et al.
patent: 4999559 (1991-03-01), Katz
patent: 5043613 (1991-08-01), Kurata et al.
patent: 5128570 (1992-07-01), Isozaki
patent: 5280209 (1994-01-01), Leupold et al.

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