Drive system of synchronous motor
US8258732B2 · kind B2 · utility
11Cited by
11References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2009 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | Dec 11, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive system of a permanent magnet motor is constituted of a mode switching trigger generator which monitors a state of a permanent magnet motor and issues a mode switching trigger, a conduction mode determining unit which receives the mode switching trigger and switches the mode of the permanent magnet motor, and a PWM generator which outputs a PWM signal to an inverter in accordance with the output of the conduction mode determining unit. The mode switching trigger is generated on condition that the speed electromotive force of the permanent magnet motor exceeds a constant or variable threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.