Patent · US Active

Method and apparatus for driving a sensorless BLDC/PMSM motor

US9106167B2 · kind B2 · utility

1Cited by

11References

13Claims

0Family size

Assignee

MELEXIS TECHNOLOGIES NV · BE

Inventors

Viktor Petri · Erfurt, DE
Thomas Freitag · Hamburg, DE

Key dates

Filing date	Aug 29, 2013
Grant date	Aug 11, 2015
Priority date	—
Expiry date	Mar 7, 2034

Classification

Technology area (CPC H)Electricity
CPC primaryH02P6/30
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for driving a BLDC motor comprising at least three stator windings, comprising: a) determining a time period, and energizing during the time period two of the windings and leaving a third winding un-energized, based on a first motor state; b) measuring a first voltage representative for the back-EMF generated in the un-energized winding shortly before expiry of the time period; c) applying a commutation at expiry of the current time period; d) measuring a second voltage shortly after the commutation, and calculating a subsequent time period; e) repeating steps b) and c). An electrical circuit and a controller are provided for performing these methods.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.