Patent · US Active

Method and drive apparatus for driving an electromagnetic actuator

US9337766B2 · kind B2 · utility

1Cited by

2References

11Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Florian Weinl · Gettorf, DE
Michael Pantke · Friedrichshafen, DE

Key dates

Filing date	Aug 2, 2012
Grant date	May 10, 2016
Priority date	—
Expiry date	Aug 2, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH01F2007/185
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method of activating an electromagnetic actuator having at least one coil and a movable armature. The method includes the step in which the electromagnetic actuator is demagnetized by passing a sequence of electric current pulses with a current flow direction which alternates from one current pulse to the next and with a current size which decreases from one current pulse to the next, through the at least one coil, in order to reduce or eliminate any residual magnetic flux density in the electromagnetic actuator. The method also includes a step in which a position of the movable armature is determined, after the demagnetization step, by passing a measurement current pulse through the at least one coil.

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