Angular speed detecting device using dual angular position...

Details Angular speed detecting device using dual angular position... Angular speed detecting device using dual angular position...

2005-04-19

2008-10-14

Assouad, Patrick (Department: 2862)

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

C324S207200, C324S207210, C702S145000

Reexamination Certificate

active

07436172

ABSTRACT:
An angular speed detecting device is composed of a magnetic sensor unit connected to a rotating object and including a permanent magnet and a pair of magnetic sensor elements to generate a pair of signals and an electric computing unit that calculates an angular speed from the signals. The electric computing unit calculates the angular speed by the following steps: forming sine and cosine functions of an angle θ′ from the signals; forming a saw-tooth curve of the angle θ′; forming a table showing plus or minus sign of the signals and the saw-tooth curve of the angle θ′ at a plurality of rotation angles of the rotating object; forming a pair of curves of output angles θ1and θ2in terms of 360-degree angular range by distinguishing rotation position of the rotating object from a combination of the plus, or minus sign of the signals and the saw-tooth curve of the angle θ′; and selectively using curves of the output angles θ1and θ2to calculate the angular speed of a rotating object.

REFERENCES:
patent: 2003/0177649 (2003-09-01), Ito et al.
patent: 60211366 (1985-10-01), None
patent: 2002-340511 (2002-11-01), None
patent: 2002340512 (2002-11-01), None

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