Single sensor position encoder providing two levels of resolutio

Details Single sensor position encoder providing two levels of resolutio Single sensor position encoder providing two levels of resolutio

1997-06-11

2000-08-08

Williams, Howard L.

Coded data generation or conversion

Digital pattern reading type converter

Incremental

341 7, H03M 130

Patent

active

061008230

ABSTRACT:
A rotor position encoder is provided for an electrical machine having a rotor and a stator, the encoder including a coded disc having teeth of widths that vary in a repeating sequence and being arranged to rotate with the rotor past a sensor which outputs a signal corresponding to the coded sequence. By comparing the coded signal with an internally generated signal the position of the rotor can be determined at a first resolution level. In addition, a counter is enabled as each tooth is sensed and provides a second output signal at a higher resolution level indicative of the rotor position between successive teeth. For a multi-phase machine, a value representative of the rotor position relative to each phase is combined with the value representative of the incremental position common to all phases. High resolution rotor position encoding with simplified logic is thus provided.

REFERENCES:
patent: 5206645 (1993-04-01), Urich
patent: 5373206 (1994-12-01), Lim
patent: 5438330 (1995-08-01), Yamazaki et al.
patent: 5650779 (1997-07-01), Sugden
"The Characteristics, Design and Applications of Switched Reluctance Motors and Drives", by Stephenson and Blake, presented at the PCIM '93 Conference and Exhibition at Nurnberg, Germany, Jun. 21-24, 1993.

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