| 摘要 |
<p>According to the invention, the equipment with direct current variator for driving the trolleybuses with direct current motors comprises two ultrafast line safety fuses (1, 2) one for each phase, a radio noise filter consisting of two inductances (3, 4), one for each phase, a capacitor (5) parallelly mounted with an overvoltage protection element (6), a limiting contactor (7) serially connected with a limiting resistor (8) and two main contactors (9, 10), which are closed in a delayed way after closing the limiting contactor (7), by means of which the direct current supply voltage is applied to a mono-phase rectifier with four diodes (11, 12, 13, 14) for the running duty and two thyristors (15 and 16) anti-parallelly mounted on the diodes, said thyristors being blocked in running duty, the bridge output voltage is applied to a LCR network filter, to the negative polarity of the filter capacitor (18) there being connected to the emitter of an IGBT transistor (20) of a direct current variator, to the collector of the transistor (20) there being connected the anode of a working duty diode (21) having the collector connected to the positive polarity of the capacitor (18), to the collector of the transistor (20) there is serially connected a circuit consisting of a current adjusting inductance (23), the series-type traction motor excitation (Ex), a forward-running contactor (24), connected to the "a" terminal of the rotor of the traction motor (M), to the "b" terminal thereof there being connected another forward-running contactor (25) these contactors being closed upon the forward-running of the trolleybus and upon the backward-running, respectively the forward-running contactors (24 and 25) are open, and the motor is supplied with reversed polarity.</p> |
