Patent · US Active

Position recognition in an electromagnetic actuator without sensors

US7804674B2 · kind B2 · utility

7Cited by

6References

15Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Reiner Keller · Stockach, DE
Kai Heinrich · Bodnegg, DE
Michael Pantke · Friedrichshafen, DE

Key dates

Filing date	Apr 4, 2006
Grant date	Sep 28, 2010
Priority date	—
Expiry date	Nov 4, 2027

Classification

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

Abstract

An electromagnetic actuator and a method for controlling the actuator comprising at least one armature (3) and two coils (1, 2). The voltage gradient at the two coils (1, 2) is measured during a sudden increase in voltage. From this measured data, a subtractor (16) computes a third voltage gradient (25) from which a logic unit (17) determines the position of the armature (3) without the use of an additional sensor.

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