Double-sided, non-iron core, brushless, axial magnetic field permanent-magnet type DC motor
US6011337A · kind A · utility
Inventors
Key dates
| Filing date | Oct 20, 1998 |
| Grant date | Jan 4, 2000 |
| Priority date | — |
| Expiry date | Oct 20, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2203/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A double-sided, non-iron core, brushless, axial magnetic field permanent-magnet type DC motor includes a shaft, two electromagnet units parallelly mounted on the shaft, and a permanent magnet unit mounted on the shaft between the electromagnet units and having its direction of magnetization disposed in parallel to the shaft. The permanent magnet unit is allowed to rotate relatively around the electromagnet units by being forced by magnetic repulsion force from both sides. Electromagnetic areas at the electromagnet units are arranged in a staggered manner, enabling permanent steel magnets at the permanent magnet unit to be alternatively fully induced from its two opposite sides to provide a high torsion output. The electromagnetic areas of the two electromagnet units are caused to change the phase alternatively at a 90.degree. phase difference, so that vibration and dead section problems are eliminated during the operation of the DC motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.