Method and apparatus for improved low current accuracy in multi-phase step motors
US6867566B2 · kind B2 · utility
0Cited by
11References
3Claims
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Key dates
| Filing date | Aug 15, 2003 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Aug 15, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The sense signal, which is used to indicate that the motor phase current in a stepper motor is at the set point, is marked both before and after each pulse width modulator edge thereby reducing susceptibility to commutation noise from any phase. A mask time is created for a period before and after a PWM edge. The phase current is balanced during this mask time by removing and replacing the phase current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.