PULSE WIDTH MODULATION APPLICATION IN ENGINE CURRENT REGULATION DURING TRAM SLIP
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Keywords:
antislip device, motor current control, pulse width modulationAbstract
The reliability of electric transport depends on the performance of traction motors, which is disturbed by the emergency modes of operation of these devices in certain traffic conditions. During tram movement, traction may exceed the clutch force, which results in slipping, which is an undesirable phenomenon - it reduces the traction force (loss of power) of the engine.
The antislip device based on regulating the excitation winding current to change the electromechanical characteristic to a more rigid are treated in paper. The transition to a more rigid characteristic is performed by applying a parallel circuit for connecting the motors and regulating the current using pulse width modulation. For this purpose, a control module is included in the circuit, which receives signals from current and voltage sensors to estimate the speed and intensity of slip. The control module calculates the frequency of rotation of the armature of the motors and, according to the data obtained, opens the transistor using pulse-width modulation, which leads to an increase in current in the field windings and an increase in the magnetic flux of the slip engine. As a result, the rotational speed of the wheelset slip decreases and the slipping stops. The antislip device work was evaluated using software. The program calculates the value of the currents on the skidding engine with a step-by-step difference in the speed of rotation of the wheel pairs. Was investigated the skid for certain values of excess slip. The dependences of the change in current through the transistor on certain values of excess slip for different speeds of the tram car are built. The evaluation of the traction device showed the effectiveness of its use on operated tram cars. On the basis of the conducted researches there is a possibility of creation of automatic control system for PWM, and consequently and automatization of work of all protivobuksovochny device.
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