Method of controlling a rotary electrical machine, a servo-control system for implementing the method, and a rotary machine fitted with such a system
US6198248A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1999 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Nov 3, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/909
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of controlling the torque of a rotary machine powered by means of an inverter and servo-controlled by a system having sensors, an observer, and a computer which delivers controls to the switches of the inverter on the basis of values supplied to the observer by the sensors, in the form of sequences of three vectors to bring the torque .GAMMA. and the stator flux .PHI..sub.S of the machine towards reference values for .GAMMA..sub.ref and .PHI..sub.Sref. The measurement sampling period is selected to be equal to the sequence period DTML which corresponds to half the switching period of the inverter. The characteristics of the vectors for each sequence are obtained by solving the following system of equations: ##EQU1## in which d.GAMMA./dt.sub.a and d.GAMMA./dt.sub.p are variations over time in torque respectively when an active vector V.sub.a or a passive vector V.sub.p is applied, .GAMMA..sub.n being the present torque, and t.sub.a and t.sub.p are the respective times during which the vectors are applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.