Motor drive device and motor drive integrated circuit device
US6998801B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2005 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Feb 17, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor drive device which controls a spindle output predriver unit and power MOSFETs of an output stage associated with it to form a PWM signal in such a manner that a detection current formed by a DC shunt resistor and a sense amplifier and a current instruction signal coincide with each other, generates a regenerative signal obtained by giving dead times to the PWM signal, generates an energizing timing signal from the result of BEMF (back electromotive voltage) zero cross detection and generates signals for controlling on/off of power MOSFETs of three phases to thereby drive a three-phase motor, is provided with a switching characteristic adjustment unit which measures a time at which the spindle output is being transitioned and performs such feedback control that the measured time and a designated switching time coincide with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.