Position-sensorless control method and device for long-cable drive permanent magnet motor
US11050372B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2019 |
| Grant date | Jun 29, 2021 |
| Priority date | — |
| Expiry date | Nov 1, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A position-sensorless control method and device for long-cable drive permanent magnet motors, including: adding a coupling circuit after boost transformers in the long-cable drive circuit of a permanent magnet motor; coupling three high frequency detection signals with different frequencies into a power supply cable and windings of the motor through three coupling transformers in the coupling circuit respectively; obtaining high frequency voltage components on primary windings of the coupling transformers by bandpass filters; obtaining the position signals according to relations among effective values of the high frequency voltage components; and finally realizing the position-sensorless control of the motor by a controller according to the obtained position signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.