Micro-encoder with molded micro-magnet

Details Micro-encoder with molded micro-magnet Micro-encoder with molded micro-magnet

1997-09-24

1999-11-09

Patidar, Jay

Electricity: measuring and testing

Magnetic

Displacement

32420725, 338 32H, G01B 714, G01B 730

Patent

active

059821698

ABSTRACT:
A micro-sized encoder which can be used to track the rotational position, angular velocity and acceleration of micro-sized rotating devices. The encoder includes an extrusion molded, micro-sized ceramic housing adapted to receive the radically micro-polarized, mullet-pole micro-magnet with an axially shaft. End plates with integral bearings are formed which mount to the housing and support the axially shaft. A thin film Hall sensor mounted on the surface of the housing in proximity to the ratable micro-magnet is used for sensing the radial field component of the micromagnet. The sensor is in communication with sensor electronics whereby, as the micromagnet rotates, the radially alternating north and south magnetic fields are sensed to the thin film Hall sensor and counted by the sensor electronics.

REFERENCES:
patent: 5289410 (1994-02-01), Katti et al.
patent: 5302893 (1994-04-01), Yoshimura
patent: 5481188 (1996-01-01), Mizutani
patent: 5572120 (1996-11-01), Takaishi et al.
patent: 5643194 (1997-07-01), Negre
patent: 5735985 (1998-04-01), Ghose et al.
patent: 5791040 (1998-08-01), Furlani et al.
William J. Grande, Svetlana Reznik and Joy Ertel, "A Hall Effect Microsensor For Micromechanical Device Characterization", 1997, pages not available.
"Hall Effect Transducers", Microswitch, Honeywell, pp. 52-87.

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