Patent · US Expired

Inductive motion sensor

US5183056A · kind A · utility

55Cited by

7References

13Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Bjoern Dalen · Stockholm, SE
Kenth Nilsson · Åkersberga, SE
Kurt Hoegnelid
Liliane Wecke · Sundbyberg, SE

Key dates

Filing date	Oct 18, 1990
Grant date	Feb 2, 1993
Priority date	—
Expiry date	Oct 18, 2010

Classification

Technology area (CPC G)Physics
CPC primaryG01P13/00
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

An inductive motion sensor (MS) connectable to a subject (16), the motion sensor having a coil (4) and a magnet member (3) movable relative to the coil (4). The magnet member (3) has at least four magnetic poles, whereby the number of south poles (S) is equal to the number of north poles (N). The pole strength of the magnetic poles is dimensioned and the magnetic poles are located on the magnet member (3) such that the magnet member (3) is situated in a neutral equilibrium position in a uniform magnetic field with respect to the forces exerted on the magnetic poles by the magnetic field.

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