1-phase self starting disk-type brushless motor with cogging element
US4724350A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1986 |
| Grant date | Feb 9, 1988 |
| Priority date | — |
| Expiry date | Sep 22, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A 1-phase disk-type brushless motor comprises a cogging-generating magnetic member or plate having a width substantially equal to the width of each pole of a magnet rotor and located at a specific position on a stationary printed circuit board so that the magnet rotor may stop with one pole thereof just opposed to the magnetic member, thereby assuring self-starting of the motor. The cogging generating magnetic member is shaped such that the volume or area may gradually decrease forwardly relative to the direction of rotation of the motor so that the cogging torque generated by the magnetic member may gradually increase upon starting of the motor, thereby assuring smooth rotation of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.