Abstract
The following paper investigates and analyses the electromagnetic processes in an electrical drive system composed of a power source, a power inverter and a brushless dc (BLDC) motor using known pulse-width modulation (PWM) methods. Investigated modulation techniques are: unipolar modulation of the upper transistors (PWM-TOP) and bottom transistors (PWM-BOT), symmetrical PWM-PWM, modulation type PWM-ON and ON-PWM, and bipolar PWM-ON modulation indicated with PWM-ON-BIP. The voltage source inverter is considered as DC-DC buck power converter, when BLDC is operated in motor mode. On the basis of summarized equivalent circuits, the analytical expressions are received for the electromagnetic processes in the system by the different modulation techniques. The efficiency of the system battery-inverter-machine for each discussed modulation is experimentally investigated and compared. These results are also compared with the efficiency of the BLDC driven with vector control. A MATLAB/SIMULINK model is proposed to implement these modulations and to analyze the obtained results. From this model, the harmonic composition of the phase currents for each modulation is investigated.
Highlights
The main energy consumer in electric vehicles is the propulsive electric machine
Analysis is performed on the electromagnetic processes in the system battery – voltage inverter – brushless dc (BLDC) motor for the different modulation techniques used in the control of BLDC motors
It is proven that in motor mode of operation of BLDC, the voltage inverter can be represented as a DC-DC buck converter
Summary
The main energy consumer in electric vehicles is the propulsive electric machine. It is important that this machine is energy efficient and that its management methods result in less energy loss [1,2]. The presence of an inverter in these systems and proper control can enable the generation mode of operation of the brushless DC machine, which is essential for electric vehicles. For this purpose, the inverter can operate as a bidirectional DC-DC converter. Paper [9] discusses the electromagnetic processes in the exchange of energy between the electrical machine and the power source while operating the machine in generator mode using different types of modulations. The voltage source inverter is considered as DC-DC power converter
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