Abstract
The influence of power semiconductor characteristic in Pulse-width-modulation (PWM) inverter on the magnetic hysteresis curve in silicon steel is discussed through the measured magnetic hysteresis curves. The magnetic hysteresis curve of PWM inverter-fed silicon steel has a lot of minor loops as closed loops and open loops, which make an influence on the iron loss. Two shapes of minor loops are found to be caused by the voltage shifts and they are derived from the on-voltage of the semiconductors in PWM inverter circuit. Therefore, it is concluded that the power-semiconductor characteristic in PWM inverter makes an influence on the magnetic hysteresis curve in silicon steel.
Highlights
Pulse-width-modulation (PWM) inverters are generally used in motor drive system to control the rotational speed and electromagnetic torque of electrical motor
The magnetic hysteresis curve of PWM inverter-fed silicon steel has a lot of minor loops as closed loops and open loops, which make an influence on the iron loss
Two shapes of minor loops are found to be caused by the voltage shifts and they are derived from the on-voltage of the semiconductors in PWM inverter circuit
Summary
Pulse-width-modulation (PWM) inverters are generally used in motor drive system to control the rotational speed and electromagnetic torque of electrical motor. Influence of PWM inverter’s parameter, such as modulation index or pulse wave on iron loss, is evaluated, and motor loss characteristics are researched as measurement data.. An influence of power semiconductor characteristics, which is a main component of inverter circuit, on magnetic hysteresis curve and iron loss is not discussed yet. The minor-loops analysis in B-H curve in connection with inverter circuit analysis shows that the power semiconductor characteristics in the inverter make an influence on the magnetic hysteresis curves and the iron loss increase. By changing the pulse width and the pulse interval, arbitrary voltage and frequency are obtained, and they are required for the rotational speed control of electrical motor
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