DEVICE TO CONTROL SPEED OF ELECTRIC VEHICLE Russian patent published in 2007 - IPC B60L15/08 

FIELD: railway transport.

SUBSTANCE: invention can be used on vehicles with dc traction motors. Proposed device contains dc traction motors, two digital-to-analogue converters and seventh contactor. Connected to free lead of armature winding of first dc motor are series-connected armature winding of third dc motor, sixth contactor and field winding of third dc motor. Its free lead is connected with free lead of field winding of first dc motor. Cathode of third diode is connected to common terminal of sixth contactor and field winding of third dc motor. Free lead of first resistor is connected with common terminal of field winding of first dc motor and second contactor. Free lead of contactor is connected with common lead of armature winding of fourth dc motor and with ground. Free lead of armature winding of fourth dc motor is connected with free of armature winding of second dc motor. Free lead of field winding of second dc motor is connected through field winding of fourth dc motor with common terminal of first contactor, cathode of first diode and free lead of second resistor. Cathode of second diode is connected with free lead of fifth contactor. Input of first digital-to-analogue converter is connected to common terminal of armature winding of thirds dc motor and sixth contactor, and its output is connected with anode of third diode. Input of first digital-to-analogue converter is connected through seventh contactor with output of second digital-to-analogue converter and common terminal of armature winding of second dc motor and third contactor. Input of second digital-to-analogue converter is connected with cathode of second diode.

EFFECT: invention is aimed at optimization of mode of starting and maximum power.

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