Control techniques for motor driven systems utilizing back-EMF measurement techniques
US9121753B2 · kind B2 · utility
4Cited by
25References
22Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 6, 2013 |
| Grant date | Sep 1, 2015 |
| Priority date | — |
| Expiry date | Feb 6, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/034
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for automatic resonance detection is disclosed for a motor-driven mechanical system such as a voice coil motor (VCM) in which a resonance detector and driver are provided. The automatic resonance detector is implemented on the same integrated circuit as the driver, and dynamically determines the natural resonant frequency of the VCM driven by the driver. The resonant frequency is determined by measuring the back electromotive force (BEMF) of the VCM, detecting the slope of the BEMF signal, and determining the resonant frequency from the slope of the BEMF signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.