Method and device for determining phase currents and an excitation current of an electrical machine, and motor system
US10158307B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 2014 |
| Grant date | Dec 18, 2018 |
| Priority date | — |
| Expiry date | Sep 19, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method for determining the phase currents through phase windings (12) and an excitation current through an excitation winding (13) of an electrical machine (11), wherein an excitation winding (13) is connected between a star point (14) of the phase windings (12) and a defined reference potential, the method comprising the following steps: —periodic driving of the electrical machine (11) with a predefined pulse pattern (30); —determining a respective measurement current (Imess) in a plurality of temporal measuring windows (31, 32, 33) of a measuring period (37), wherein the measurement currents (Imess) correspond to currents through one of the phase windings (12) and through one or more parallel connections of a plurality of the phase windings (12); and —determining the phase currents and the excitation current by evaluating the measurement currents (Imess) determined during the measuring period (37).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.