Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-04-24
1998-03-03
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023116, 25055945, G01D 534
Patent
active
057238588
ABSTRACT:
A failure detector for a position encoder which uses a plurality of position sensors. The failure detector receives position signals from the plurality of position sensors. The position signals represent the rotor position for a switched reluctance machine, and the position signals have allowable states and allowable output state sequences that occur if the position encoder is operating properly. If one or more of the plurality of sensors fail or the rotating element of the position encoder is damaged, an illegal state occurs in the position signals from the position sensors. The failure detector produces a failure signal upon the occurrence of an illegal state. In addition, the failure detector monitors the sequence of the output states and generates a failure when the output states change in a sequence that is not one of the allowed sequences. The machine controller can respond to the failure signal to stop machine operation or trigger an alternate positioning scheme.
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patent: 4507590 (1985-03-01), Miyazakil
patent: 4600835 (1986-07-01), Ishida et al.
patent: 4678948 (1987-07-01), Schmitt
patent: 4896088 (1990-01-01), Jahns
patent: 4896089 (1990-01-01), Kliman et al.
patent: 5128536 (1992-07-01), Higashi
Stephenson and Blake, The Characteristics, Design and Applications of Switched Reluctance Motors and Drives, (Jun. 1993, Nuremberg, Germany), pp. 1-67.
Le Que
Switched Reluctance Drives Ltd.
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