B - Operations – Transporting – 60 – L
Patent
B - Operations, Transporting
60
L
318/103, 342/34,
B60L 15/04 (2006.01) B60L 7/12 (2006.01) B60L 15/20 (2006.01)
Patent
CA 1188778
ABSTRACT OF THE DISCLOSURE When a plurality of shunt motors connected in paral- lel are used for driving an electric railcar, any difference in the characteristics of the motors introduced through the manufacturing steps causes the armature currents to become greatly different even when the motors are running at the same speed. To control the field current by a single device, therefore, the armature currents must he corrected by armature choppers. In order to fully recover the energy possessed by the electric railcar, the present invention automatically corrects difference in the characteristics of the shunt motors so that the required braking force is uniformly born by each of the shunt motors.
414389
Marks & Clerk
Mitsubishi Denki Kabushiki Kaisha
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