Method of controlling speed of synchronous motor, and method of identifying constant of synchronous motor
US7076340B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2000 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | May 25, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2207/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In sensorless vector control performed through use of a rotation speed of a synchronous motor 6 and the position of a rotor, a positive current is caused to flow to a γ axis on the assumption that a “d” axis serving as a true magnetic axis is out of phase with the γ axis by only an angle of load θe, whereby torque which is proportional to iγ sin θe and directed toward the γ axis arises in the magnetic axis. Accordingly, a deviation between a d-q axis serving as a true magnetic axis and a γ-δ axis serving as a control axis is eliminated. Even if load is exerted on the motor, the γ axis serving as a control axis is constantly aligned with the “d” axis serving as the magnetic axis of the synchronous motor, thereby enabling excellent vector control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.