Patent · US Expired

Linear motor

US6930411B2 · kind B2 · utility

1Cited by

4References

7Claims

0Family size

Assignee

Quick-Rotan Elektromotoren GmbH · DE

Inventors

Michael Berghaus · Darmstadt, DE
Mirco Jelusic · Mühltal, DE
Michael Kaiser · Malibu, US
Michael Raymond Lambrecht · Wolfstein, DE
Eberhard Wehner · Enkenbach-Alsenborn, DE

Key dates

Filing date	Nov 19, 2002
Grant date	Aug 16, 2005
Priority date	—
Expiry date	Dec 9, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH02K33/16
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An essentially iron-free linear motor for a sewing device or sewing machine produces and controls the pressure on the material being sewn by means of a drive rod, with a tubular housing, with at least two annular permanent magnets located therein. Each of the magnets has a north pole and a south pole and is magnetized radially, each in a different magnetization direction, and with a coil divided into at least two partial coils wound in opposite directions and each associated with a permanent magnet, whereby the partial coils and the permanent magnets are mutually displace, involving drive rod, in a magnetic lock that is effected by the housing, by a core in the form of center piece, and an air gap with the coil. The partial coils are located inside housing and the permanent magnets are located between said coils and the center piece.

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