Method of estimating magnetic pole position in synchronous motor
US7514896B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 2006 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Mar 17, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2207/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a method of estimating a magnetic pole position in a synchronous motor, an alternating current voltage having α- and β-axes components in an αβ coordinates system representing a two-phase alternating current coordinates system is applied to the motor, and α- and β-axes components of an alternating current are detected from the motor. A wave height of the alternating current changing with time is approximated to a wave height not depending on time, so that a differentiated value of the wave height with respect to time is substantially set at zero. An induced voltage of the motor is calculated from the components of the alternating current voltage and the components of the alternating current. The magnetic pole position is estimated from the induced voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.