Permanent magnet stepping motor
US5386161A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1993 |
| Grant date | Jan 31, 1995 |
| Priority date | — |
| Expiry date | Apr 20, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/2713
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.