Patent · US Active

Operation of BLDC motors

US8593098B2 · kind B2 · utility

6Cited by

42References

12Claims

0Family size

Assignee

MELEXIS TECHNOLOGIES NV · BE

Inventors

Christian Paintz · Erfurt, DE
Thomas Freitag · Hamburg, DE

Key dates

Filing date	Dec 10, 2009
Grant date	Nov 26, 2013
Priority date	—
Expiry date	Nov 21, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH02P2203/03
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The present invention there is provides a method of determining the rotor position in an electric motor comprising the steps of: superimposing one or more alternating signals on to the driving waveform so as to generate one or more oscillating currents in the stator coils; monitoring the variation in magnitude of the oscillating currents and thereby determining the rotor position. Typically, two alternating signals are applied in opposition so as to have no net effect on the torque applied by the driving waveform. Using this technique rotor position estimation can be obtained at start-up from stand-still and at low to medium speeds. The method can be used in applications where a fast motor start is needed under unknown load conditions and can be used to detect when the rotor has passed a certain position that coincides with the commutation instance.

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