Modification of stator current for enhanced flux weakening
US9774287B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2016 |
| Grant date | Sep 26, 2017 |
| Priority date | — |
| Expiry date | Jul 14, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/0089
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric machine assembly includes an electric machine having a stator configured to have a stator current and a controller configured to receive a torque command (T). The controller has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method of modifying the stator current for enhanced flux weakening. The controller is programmed to obtain a base stator current [IdLU, IqLU] from a look-up table based at least partially on the torque command (T). The controller is programmed to obtain a characteristic angle (θi, i=1, 2, 3) based at least partially on a value of the torque command (T) and the base stator current [IdLU, IqLU]. A stator current modifier [ΔId, ΔIq] is obtained based at least partially on the characteristic angle (θi, i=1, 2, 3) and a flux weakening factor (ΔIS) such that: ΔId=(ΔIS*cosine (θi)) and ΔIq=(ΔIS*sine (θi)).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.