The task of creating a simple and cheap climate control device in the interior of the vehicle is relevant. Such a problem can be solved by adjusting the air flow rate of the interior heater, which is determined by the speed of the rotor of the fan motor. The article is devoted to modeling and experimental study of automatic air flow control in the cabin of a vehicle.Keywords: microclimate, climate control, airflow control frequency of rotation of a DC motor, automatic temperature control.
The increasing traffic and growing demands to voltage pressure in the catenary system has led to the search of effective technical solutions for the strengthening of DC traction power supply system, which includes: volts adding devices, partitioning and parallel connection points, reinforcing wires. The development of engineering technologies, the improvements of superconducting materials and its conductors characteristics, cryogenic supply systems development open up the possibility for strengthening with superconducting cable line. This strengthening technology is able to provide the increase of voltage pressure level at the catenary system on limiting stretch and to increase the operation of the short circuit currents protection system to the fundamentally new level with significant simplification of its functional algorithms. Unlike traditional strengthening technologies the usage of superconducting cable lines additionally allows to increase the distance between traction power substations. This circumstance restores the status of DC current electrification.Keywords: two-way power supply, traction power supply system, superconducting cable line, intersubstation zone, catenary, electric rolling stock, track circuit.
The paper suggests an efficient method of power control with static VAR generators installed on overhead line feeder pillars, which enables to control the traction load current based on the ratio of its harmonics. An algorithm is given for determination of compensation current for total compensation of reactive power of traction load related to a feeder pillar. An example is presented of practical implementation of control of static VAR generator on a feeder pillar.Keywords: рower control, electric energy losses, static VAR generator, overhead line, feeder pillar, current harmonics.