Patent ID: 7904216

Claim:
An electric train control apparatus having a plurality of electric motors and a plurality of inverters configured to control the electric motors, independently of one another, comprising: shaft speed calculating units provided in association with the electric motors, respectively, and configured to calculate shaft speeds of the electric motors; reference speed calculating unit configured to calculate a reference speed from the shaft speeds of the electric motors, calculated by the shaft speed calculating units; acceleration detection control units provided in association with the inverters, respectively, and configured to calculate torque reduction values from rates at which the shaft speeds calculated by the shaft speed calculating units change with time; slip speed control units provided in association with the inverters, respectively, and configured to reduce torques in accordance with a difference between the shaft speeds of the electric motors, calculated by the shaft speed calculating units, and the reference speed output by the reference speed calculating unit; state monitoring units provided in association with the inverters, respectively, and configured to monitor states of detecting the shaft speeds and output state signals; and changeover unit configured to switch control of the inverters, between the acceleration detection control units and the slip speed control units, in accordance with the state signals received from the state monitoring units.