Apparatus and method for estimation of initial phase of a brushless motor
US7376525B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2006 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | May 9, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/064
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus comprises a brushless motor, driver, incremental displacement sensor, and processor. The motor has a rotor, stator, and electrical terminals accepting a drive signal. The initial phase of the rotor is unknown. The driver is connected to the electrical terminals and produces the drive signal. The displacement sensor is configured to measure a displacement of the rotor and to produce an output signal. The processor has an input receiving the output signal and an output connected to the driver. The processor causes the driver to produce the drive signal according to a predetermined function of time, observes the output signal from the displacement sensor resulting from the drive signal, and performs mathematical computations on the basis of the observed output signal and a model of dynamic behavior of the motor to estimate the initial phase of the rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.