Patent · US Active

Method and arrangement for commutating an electronically commutated motor

US7759884B2 · kind B2 · utility

36Cited by

9References

25Claims

0Family size

Assignee

ebm-papst St. Georgen GmbH & Co. KG · DE

Inventors

Thomas Dufner · Schonach, DE
Frank Heller · Berlin, DE
Arno Karwath · Rottweil, DE

Key dates

Filing date	Nov 13, 2006
Grant date	Jul 20, 2010
Priority date	—
Expiry date	Oct 28, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH02P6/28
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electronically commutated motor has a permanent-magnet rotor (124) having: at least two rotor poles (183, 186, 188, 189); at least one phase (126); a power stage (122); and a rotor position sensor (140). Associated therewith is a control circuit implemented to carry out the following steps in order to even out the motor current (320): A) after a change of the rotor position signal (182), referred to as a first pole change, a first value (I_MEAS(HCnt−1)) of the current through the at least one phase (126) is ascertained; B) after a predetermined time span (T_Default+T_Offset(HCnt−1)), a new commutation is carried out; C) after a change of the rotor position signal (182), referred to as a second pole change, a second value for the motor current (I_MEAS(HCnt)) is ascertained; D) as a function of the difference between the first value (I_MEAS(HCnt−1)) and second value (I_MEAS(HCnt)), the value for the predetermined time span is modified.

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