Hybrid-type stepping motor
US4983867A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1990 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Jun 28, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A stepping motor includes a stator having a plurality of magnetic poles wound with windings of three phases or four phases, and a rotor formed by a pair of rotary plates each having a multiplicity of gear-like salient poles and an axially magnetized permanent magnet sandwiched between the rotary plates. Where the number of magnetic poles of the stator is represented by m, the number of gear-like salient poles of the rotary plate is Z, and n is an integer equal to or larger than 1, in order to obtain a minute step angle, m, n and Z are selected to satisfy the following relationship: when m=9, and a 3-phase winding stator, Z=9n.+-.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.