Method for detecting locked-axle conditions without a speed sens

Details Method for detecting locked-axle conditions without a speed sens Method for detecting locked-axle conditions without a speed sens

1999-01-29

1999-11-23

Ro, Bentsu

Electricity: motive power systems

With signals, meters, recorders or testing devices

104307, 105 2605, B61C 1700

Patent

active

059906480

ABSTRACT:
A method for detecting the occurrence of actual locked axle conditions in a vehicle propelled by AC motors includes the steps of detecting a potential locked axle condition, which may be induced due to a faulty speed sensor; setting the frequency of the inverter which controls operation of the AC motor coupled to the potentially locked axle at a predetermined frequency value; varying the level of electromagnetic flux in the motor; measuring torque produced by the motor; and determining based on the measured torque whether or not the potential locked axle condition is an actual locked axle condition.

REFERENCES:
patent: 4071871 (1978-01-01), Kochem
patent: 4243927 (1981-01-01), D'Atre
patent: 4896090 (1990-01-01), Balch et al.
patent: 5480220 (1996-01-01), Kumar
patent: 5652525 (1997-07-01), Mullin et al.

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