Motor control apparatus, sheet conveyance apparatus, document feeding apparatus, document reading apparatus, and image forming apparatus
US10326397B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2018 |
| Grant date | Jun 18, 2019 |
| Priority date | — |
| Expiry date | Oct 4, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2221/1657
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus, to control a motor from an instructed phase indicating a motor rotor target phase, includes a detector, a phase determiner, a converter, and a controller. The detector detects a motor winding driving current. The phase determiner determines a rotor rotation phase from the detected driving current. The converter converts a detected current value in a stationary coordinate system into a current value in a rotational coordinate system from the determined rotation phase. The controller includes a first mode for controlling the driving current to cause a determined phase deviation between the instructed and rotation phases to decreased, and a second mode for controlling the driving current from a current having a previously determined magnitude. On switching the mode from the second to the first mode, the first mode target value is set from a driving current value corresponding to a current component represented by the rotational coordinate system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.