Method to prevent midrange resonance during operation of a multi-phase step motor
US7154245B2 · kind B2 · utility
1Cited by
4References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2005 |
| Grant date | Dec 26, 2006 |
| Priority date | — |
| Expiry date | Dec 20, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The frequency of the pulse width modulator within a step motor control circuit is increased above a base frequency under defined conditions to enable more accurate construction of the phase current waveform for preventing mid-range resonance. The PWM frequency is stepped between frequencies by a fixed amount above the base frequency, to prevent the excitation of system harmonics and prevent step motor operational instability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.