Field orientation control of a permanent magnet motor
US4814677A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1987 |
| Grant date | Mar 21, 1989 |
| Priority date | — |
| Expiry date | Dec 14, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A field orientation control system for an interior permanent magnet synchronous motor includes function generating means responsive to a torque command signal for producing direct and quadrature axis direct current signals which are converted to synchronously-varying two-phase signals for coupling to power control means, for effecting sinusoidal energization of the permanent magnet motor. The function generators modify the torque command signal as a predetermined function of the motor parameters. Rotor position information is derived from measured stator voltages and currents without the use of a separate rotor position sensor. The control system includes means for establishing a preselected amplitude of a stator .alpha.-axis current in the motor at start-up prior to establishing orthogonal .beta.-axis current such that the motor rotor is caused to become initially aligned with the selected .alpha.-axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.