Permanent magnet type stepping motor
US5128570A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnetic type stepping motor which is suitably used in such office automation machines and apparatuses and which parameters are set to satisfy the following conditions (1) to (4). PA0 (1) The magnetic poles for the stator be 6 in number and be arranged as equally spaced by an identical pitch. PA0 (2) Each of the magnetic poles of the stator be provided on its tip end with pole teeth which are equal in pitch to the pole teeth of the rotor magnetic poles or the pitch .tau..sub.s of the pole teeth of the stator magnetic poles and the pitch .tau..sub.R of the pole teeth of the rotor should satisfy the following correlations. EQU .tau..sub.S =180.tau..sub.R /(180.+-..tau..sub.R) EQU 60/.tau..sub.S =m(where m=1, 2 . . .) PA0 (3) An angle .sigma..sub.r made between one of the stator magnetic poles and adjacent one of the rotor magnetic poles satisfy a relationship .theta..sub.r =120.degree./Z. The number of pole teeth in the rotor magnetic poles meet an equation Z=6n.+-.4 (where n is a positive integer). PA0 (4) The number of lead wires of the stepping motor be either one of 3, 6, 7 and 9.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.