Pole position detector for motor
US6713981B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 2001 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Jul 11, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pole position detector correctly detects a pole position of a permanent magnet motor. Each magnetic sensor (27) provides an electric signal in response to leakage flux from a magnet rotor (17). A computation unit (2) detects a change in the output of the magnetic sensor as a base pole position &thgr;, corrects the base pole position by &Dgr;&thgr; according to the base pole position, the magnitude of each stat or current (IU, IV, IW), and a current phase, and calculates correct rotation angles &thgr;re and &thgr;re′ accordingly. With low-cost magnetic sensors (27), the pole position detector corrects the outputs of the magnetic sensors affected by stat or current and provides a correct pole position or a correct rotor rotation angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.