Device for estimating pole position of synchronous motor
US7161324B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2003 |
| Grant date | Jan 9, 2007 |
| Priority date | — |
| Expiry date | Jul 16, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/098
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An influence resulting from double saliency of an electric motor, i.e., an influence of a deviation of the axis of an alternating current due to a rotor magnetic pole position θ on the estimation of a magnetic pole position, is eliminated, and, in particular, the magnetic pole position of a double saliency electric motor can be estimated with high precision. To this end, an alternating voltage impression section impresses an alternating voltage on an electric motor, a current detection section detects a motor current, a reference direction generation section outputs an instantaneous reference direction θ′ from a rotor magnetic pole position θ of the electric motor, a vector conversion section separates the detected current into a parallel component and a quadrature component with respect to the reference direction θ′, and a magnetic pole position estimation section estimates actual rotor magnetic pole position θ of the electric motor based on at least one of the parallel component and the quadrature component of the current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.