Sensorless control method and apparatus of permanent magnet synchronous motor
US6081093A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1999 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Jul 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2207/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides a sensorless control method and apparatus of a permanent magnet synchronous motor where magnetic axis can be assigned in all speed regions and speed can be controlled continuously irrespective of the speed command. In the control method, the d-q axis being the magnetic axis rotating in the real rotation speed .omega..sub.R of the motor is set and also the .gamma.-.delta. axis being the assigned magnetic axis of the motor is set, and when the rotation speed .omega..sub.R.sbsb..gamma. of the .gamma.-.delta. axis is determined, a distribution gain K1 is set so as to be decreased as the absolute value of the rotation speed command .omega..sub.RREF becomes large and a distribution gain K2 is set so as to be increased as the absolute value of the rotation speed command .omega..sub.RREF becomes large, and the rotation speed command .omega..sub.RREF is multiplied by K1 and the speed estimated value .omega..sub.RP determined from the induced voltage of the synchronous motor or the induced voltage estimated value is multiplied by K2 respectively, and both multiplied values are summed thereby the rotation speed .omega..sub.R.sbsb..gamma. of the .gamma.-.delta. axis bein…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.