Step motor with spacing of same-phase stator pole groups based on one-half rotor tooth pitch
US11742736B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 2021 |
| Grant date | Aug 29, 2023 |
| Priority date | — |
| Expiry date | Oct 30, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A 2-phase bipolar step motor has a rotor and a stator, the rotor having a plurality of equally spaced rotor poles of alternating north and south magnetic polarities, and the stator having at least eight stator poles extending radially from a stator yoke and terminating in pole shoes interacting radially across an air gap with the rotor poles to cause the rotor to rotate step-by-step when windings around the stator poles are driven by a succession of energized states of the stator. The stator poles divided into four equal groups having a specified drive phase A or B, adjacent poles of a group having alternating drive polarities of the same drive phase A and Ā, or B and B. Adjacent poles in the same group are separated by a center-to-center angle one-half of the rotor tooth pitch or up to 20% larger. Adjacent poles of different groups have a larger separation than that between poles of the same group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.