Apparatus and method for detecting rotor position in a sensorless and brushless DC motor
US5327053A · kind A · utility
56Cited by
11References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1992 |
| Grant date | Jul 5, 1994 |
| Priority date | — |
| Expiry date | Aug 12, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus and process for detecting rotor position for improved motor start-up. The apparatus detects a target equilibrium position of the rotor using a fixed gain amplifier, window comparator and slope detector circuitry. The window comparator circuitry qualifies the peaks of the back EMF signal. Slope detector circuitry pinpoints the peak of the back EMF signal qualified by the window comparator. The technique utilizes the steps of energizing the phase windings of said motor, detecting the target equilibrium position, and then accelerating the motor through a commutation process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.