Direct current drive for a battery-operated vehicle

摘要

In a direct current drive for a battery-operated vehicle with an externally excited direct current machine (10) whose rpm is controllable and with a starter resistor (20) which can be connected into the rotor circuit of the direct current machine (10) during the starting process, during the braking of the vehicle the direct current machine (10) acts as an electric brake provided the rpm does not drop below its nominal value. In order to be able to engage an electric brake even below the nominal rpm during braking or switching off of the vehicle and in order to give the vehicle approximately the same handling characteristics as in the case of a vehicle with internal combustion engine, switching elements (K1, K4.1) which can be influenced by a control device are provided, by means of which switching elements (K1, K4.1) the rotor circuit between traction battery (14) and direct current machine (10) can be interrupted when the vehicle is switched off or braked below the nominal rpm of the direct current machine (10) and at least a portion of the starting resistance (20) can be switched between the armature pole terminals (15, 17) of the direct current machine (10). <IMAGE>