Control device for an electric motor
US10199972B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2018 |
| Grant date | Feb 5, 2019 |
| Priority date | — |
| Expiry date | Feb 5, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a control device for an electric motor (101), a three-phase/two-phase conversion section (203) outputs N d-axis current values and N q-axis current values in each measurement period that is 1/N of a carrier period. An average value calculation section (204) calculates average values of those values. A difference calculation section (205) calculates a difference between a k-th d-axis current value and the average value of the d-axis current values as a d-axis current difference, and calculates a difference between a k-th q-axis current value and the average value of the q-axis current values as a q-axis current difference. A filtering section (206) performs low-pass filtering on each difference, and outputs d-axis and q-axis current correction values. A correction calculation section (207) performs a linear operation of each k-th current value and the corresponding current correction value, and outputs the corrected current values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.