Patent RU-2260520-C1 (RU)
Inventor: MAZNEV A S
IPC: B60L15/08
Filed: 2004-03-19
Granted: 2005-09-20
Abstract: FIELD: traction electric drives. 
     SUBSTANCE: the invention is pertaining to the field of traction electric drives and may be used in electric transportation means using direct-current electric engines fed from a direct voltage network. The dc traction electric drive with thyristor control contains in series connected a power source, an on-off switch, armature windings of dc traction electric engines, in series connected excitation windings of the traction electric engines, in series connected sensors of the exciting current, armature current connected to grounding and a current controller containing the main thyristor and a damping thyristor, and also a control unit. One of the terminals of the armature winding of the second traction engine is connected to the first input of the unit of protection against skidding and slipping, the second input of which is linked to the in series connected armature windings of the first and second traction electric engines, and the third input is connected with the general output of the on-off switch and the armature winding of the first traction engine. The output of the unit of protection against skidding and slipping is connected to the second input of the control unit, the third input of which is connected to an output of the comparator, the first input of which is connected to the output of the sensor of the armature current, and the second input is connected to the output of the scaling amplifier, the second input of which is connected to the output of the sensor of the excitation current. In series connected the armature windings of the third and fourth dc traction engines are connected to the general output of the third and fourth contactors. At that the second output of the third contactor is connected to the general output of an armature winding of the first  direct current traction engine and the on-off switch, and the second output of the fourth contactor is connected to the second output of the armature winding of the second direct current traction engine, the second output of the armature winding of the fourth direct current traction engine through the fifth contactor is connected to in series connected excitation windings of the third and fourth direct current traction engines and through the sixth contactor is connected with the anode of the fourth diode. The second output of the armature winding of the fourth traction engine is connected to the first input of the second unit of protection against skidding and slipping, the second input of which is connected to in series connected armature windings of the third and fourth traction engines, and the third input is connected to other output of the armature winding of the third traction engine. The output of the second unit of protection against skidding and slipping is connected to the fourth input of the control block. The second output of the armature winding of the fourth traction electric engine through in series connected the ninth contactor, the fifth resistor shunted by the tenth contactor is connected to the cathode of the fourth diode and through the eleventh contactor - with the general output of the excitation winding of the second traction engine and the eighth contactor. The technical result is an increased efficiency of an electrical power consumption in operation under the electrical drive control. 
     EFFECT: the invention ensures an increased efficiency of an electrical power consumption in operation under the electrical drive control. 
     1 dwg