Hybrid step motor
US9214849B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 2013 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Jan 20, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A stepper motor is provided in which a permanent ring magnet is sandwiched in an outer part of the stator winding assembly located far from the gap between rotor and stator teeth, so that magnetic flux in the gap is dominated by the Ampere-turns of energized stator coils and therefore more easily controlled for reduced vibration at low stepping speeds. The rotor need not contain any permanent disk magnet. If one is provided, it can be completely embedded within the rotor and merely supplement the primary flux from the stator to enhance torque. In most cases, where the rotor lacks any permanent magnet, the motor's axial shaft can have a larger diameter and may, together with the rotor, form a linear actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.