Method for determining a rotor position of a three-phase machine without using a rotary encoder and device for controlling a three-phase motor without using a rotary encoder
US11218102B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2018 |
| Grant date | Jan 4, 2022 |
| Priority date | — |
| Expiry date | Dec 20, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a method for determining the rotor position of a three-phase machine without using a rotary encoder, and a device for controlling a three-phase motor without using a rotary encoder, the three-phase machine is fed by a converter that can be operated by pulse-width modulation, and the converter has model variables for the rotor angle and the current indicator of the three-phase machine, and the converter has device(s) by using which, in control operation, at least two values are measured which represent a measure of the local inductances of the machine which represent a measure of the local inductances of the machine, the error of the model rotor angle is determined in that, depending on the model rotor angle and the model current indicator, at least two weighting factors are determined, and in that a weighted sum is formed from the at least two measured values and the at least two weighting factors, and in that a further offset value is subtracted from the sum, which is likewise determined on the basis of the model rotor angle and the model current indicator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.