Motor control unit
US7548039B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2007 |
| Grant date | Jun 16, 2009 |
| Priority date | — |
| Expiry date | Dec 24, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/42215
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor control unit including a rotational position detector detecting a rotational position of a brushless DC motor; a current detector detecting a current of the brushless DC motor; a coordinate transformer executing rotational coordinate transformation of the current by a control phase angle and obtaining a d-axis current and a q-axis current; a current controller generating a command d-axis voltage based on a d-axis current error, and generating a command q-axis voltage based on a q-axis current error; a coordinate transformer generating a three-phase command voltage by the control phase angle; a conductive signal generator; and a position controller that, when executing a positioning operation, maintains the command d-axis current at a constant value and the command q-axis current at zero, and that controls the control phase angle based on a difference between a target stop rotational position and a rotational position detected by the rotational position detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.