Electricity: measuring and testing – Magnetic – Displacement
Patent
1996-01-31
1998-05-26
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Displacement
32420725, G01B 730, G01R 3306
Patent
active
057571805
ABSTRACT:
A disk type absolute-position magnetic encoder for rotary devices. It includes: (a) a circular magnetic shielding disk; (b) a plurality of permanent circular magnetic rings of varying diameters disposed on both sides of the magnetic shielding disk; (c) a circular neutral zone between every two adjacent circular magnetic rings, the circular neutral zone having a width wide enough such that it is effectively free of magnetic interference; (d) a plurality of sensors each being located at a distance from one of the circular ring for detecting a position of the rotary device; and (e) a spindle transversely running through the magnetic shielding disk. Compared to the prior art devices of optical and drum types, the disk type magnetic encoder provides substantial space savings. The magnetic shielding disk, the plurality of permanent circular magnetic rings, and the sensors are all mounted in a cylindrical housing.
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Chou Chen Shih
Jen Hukao Fu
Ming Huang Shih
Shin Tsai Wei
Industrial Technology Research Institute
Liauh W. Wayne
O'Shea Sandra L.
Patidar Jay M.
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