Motor controller and electric power steering apparatus
US7782000B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 2008 |
| Grant date | Aug 24, 2010 |
| Priority date | — |
| Expiry date | Jan 18, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/032
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
When a failure of an electric current flow occurs in any one of phases, a microcomputer calculates a d-axis current command value that changes along a tangent curve with predetermined rotation angles as asymptotic lines. The microcomputer continuously outputs a motor control signal using two phases other than the phase with the failed electric current as electric current flowing phases by performing current feedback control in correspondence with the d-axis current command value. In such two-phase drive operation, the microcomputer calculates the d-axis current command value and a q-axis current command value in such a manner that the phase current values of the electric current flowing phases become constant at respective maximum values of flowable electric currents, which are set for the phases, in rotation angle restriction ranges in which the phase current values need to be restricted in correspondence with the maximum values, or electric current restriction ranges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.