Sensorless detection of a locked rotor in a switched reluctance

Details Sensorless detection of a locked rotor in a switched reluctance Sensorless detection of a locked rotor in a switched reluctance

1999-03-30

2000-01-04

Ro, Bentsu

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, 318701, H02H 708, H02P 705

Patent

active

060113685

ABSTRACT:
A method and circuit for detecting a locked rotor in a switched reluctance motor are provided. The method includes the step of measuring, at a predetermined frequency, the time required for a current in the motor to rise or fall between predetermined current levels to thereby obtain a plurality of sample rise or fall times. The method further includes the step of comparing first and second sample times of the plurality of sample times to obtain a time comparison value that is indicative of a change in position of the rotor. Because current rise and fall times are indicative of, and vary with, rotor position, a comparison of multiple rise or fall times may be used to indicate a change in position of the rotor and, therefore, whether the rotor is in motion or is locked. The method may finally include the step of comparing the time comparison value to a predetermined reference value that is indicative of a locked rotor.

REFERENCES:
patent: 4656553 (1987-04-01), Brown
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patent: 5488276 (1996-01-01), Nishibe
patent: 5502362 (1996-03-01), Brandes
patent: 5554913 (1996-09-01), Ohsawa
patent: 5574608 (1996-11-01), Fukuoka
patent: 5612620 (1997-03-01), Mullin et al.
patent: 5619119 (1997-04-01), Sugimoto et al.
patent: 5637972 (1997-06-01), Randall et al.

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