Stepping motor driving apparatus
US8659259B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 13, 2010 |
| Grant date | Feb 25, 2014 |
| Priority date | — |
| Expiry date | Aug 8, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor driving apparatus for constant-current control of a current of a coil of a motor includes a detector detecting the current, and a controller for controlling every first cycle to feed the coil until the current reaches a target value, and to decay the current after the current reaches the target value. The controller selects, every second cycle shorter than the first cycle, between decaying the current in a first mode and decaying the current in a second mode, in which a decay rate is lower than the first mode. In addition, the controller decays the current in the first mode when the current is equal to or higher than a predetermined threshold, and decays the current in the second mode when the current is lower than the predetermined threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.