Magnetic encoder with improved resolution

Patent metadata

Field	Value
Publication number	US-8928313-B2
Application number	US-201213661247-A
Country	US
Kind code	B2
Filing date	Oct 26, 2012
Priority date	Oct 28, 2011
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

A low-cost magnetic encoder that facilitates generating sinusoidal magnetic flux is provided. First and second permanent magnet arrays each include a plurality of permanent magnets arranged such that magnetic poles having the same polarity face each other, and magnetic yokes disposed on side surfaces of the plurality of permanent magnets. The permanent magnets and the magnetic yokes are arranged side by side at a predetermined pitch in the moving direction of a magnetic piece array. First and second magnetic detectors corresponding to the first and second permanent magnet arrays are disposed in a positional relationship allowing detection of leakage magnetic flux generated when the permanent magnet arrays and the magnetic piece array are displaced with respect to each other.

First claim

What is claimed is:

1. A magnetic encoder comprising:
a permanent magnet array including a plurality of permanent magnets arranged such that magnetic poles having the same polarity face each other, or arranged such that the magnetic poles having different polarities face each other through a non-magnetic member interposed therebetween;
a magnetic piece array including a plurality of magnetic pieces spaced from each other along the permanent magnet array; and
a magnetic detecto…

Assignees

• Sanyo Electric Co

Inventors

• Sugita Satoshi
• Tang Yuqi
• Misawa Yasushi

Classifications

• G01D5/2451 Primary

  Physics · mapped topic

• G01B7/30 Primary

  Physics · mapped topic

• G01D5/244 Primary

  Physics · mapped topic