DETECTOR FOR SLIP AND SKID OF ELECTRIC ROLLING STOCK

摘要

PURPOSE:To enable detecting the slip and skid of electric rolling stock surely and with good accuracy by computing the armature voltage of a motor through the field current of said motor and the rotational speed of a non-driving wheel and by detecting said slip and skid through comparison of said computed voltage with an armature voltage detected practically. CONSTITUTION:A function generator 24 inputs the field current If of a motor and converts said field current into a function to output a magnetic flux phi. On the other hand, a speed detector 25 outputs the rotational speed N of a non-driving wheel not combined with the motor in the same electric rolling stock. Then, a multiplier 29 multiplies data phi from the function generator 24 by data N from the speed detector 25 to compute the armature voltage Em of a DC motor. Further, when the difference voltage d between the measured value Emr and computed value Em of said armature voltage exceeds a limiting value given by a limiter 23, the output of said limiter 23 is subtracted from a current command value I from a current pattern generator 26.