CONTROL APPARATUS FOR INDUCTION MOTOR & ELECTRIC ROLLING STOCK

摘要

A control apparatus for an electric rolling stock makes it possible to use a single associated train in a variety of transit services including an express transit service to an accommodation train service. The apparatus comprises an induction motor (4) controlled by an inverter (3). For an express transit operation (over a long inter-station distance), the ratio of output voltage and the frequency of the inverter is decreased to thereby increase a command current in a variable voltage/variable frequency region. For the accommodation train operation (over short inter-station distance), a control pattern reverse to the above is adopted. The electric rolling stock can adapt itself to the running conditions. Besides, problem of over-heating of the induction motor (4) can be solved successfully.