Motor drive device, brushless motor, and motor drive method
US8796967B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 2011 |
| Grant date | Aug 5, 2014 |
| Priority date | — |
| Expiry date | Oct 6, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2209/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The disclosed device comprises a duty calculator for calculating a duty command value (Dty), a duty limiter for limiting the duty command value (Dty) to a value according to a limit value (L), a current flow monitor for determining that there is an overcurrent if a current value (Idet) flowing through a winding exceeds a predetermined threshold value (Ithr), and a limit value generator for generating the limit value (L). The limit value generator updates the limit value (L) at predetermined time intervals and for a value corresponding to a difference between the threshold value (Ithr) and the current value (Idet) at a time in order to decrease the current value (Idet) during a period in which the overcurrent is determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.