Encoder system and method for determining absolute rotor positio

Details Encoder system and method for determining absolute rotor positio Encoder system and method for determining absolute rotor positio

1994-09-19

1996-02-06

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

32420716, G01B 730, G01B 714

Patent

active

054898455

ABSTRACT:
A method and system for determining absolute rotor position with a Variable Reluctance (VR) motor. An inductance sensor is compatible with the VR motor and is adapted to generate a plurality of variable inductance values corresponding to the position of the rotor. The inductance values may be plotted during calibration as phase-separated pseudo-sinusoidal waveforms with a resultant inductance/position profile having near-linear regions with determinable slopes and offsets. Excitation electronics converts variable inductance values to corresponding digital values which are suitable for computer processing. A micro computer is adapted to determine which of the digital values is a mid-value and to convert the mid-value to high resolution motor rotor angular units in accordance with the calibration-determined slopes and offsets.

REFERENCES:
patent: 4461994 (1984-07-01), MacDonald
patent: 4712186 (1987-12-01), Fromme
patent: 4991301 (1991-02-01), Hore
patent: 5107213 (1992-04-01), Ponticelli et al.

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