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To meet the ac loss measurement of the International Thermonuclear Experimental Reactor correction-coil conductors, an ac superconducting magnet has been designed and manufactured at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP), which can run at a frequency of 5 Hz and an amplitude field of 0.2 T. This ac magnet is made up of two layers of coils with NbTi superconducting strands...
This paper presents a power loss study of a machine drive system using discontinuous pulse width modulation (DPWM) excitation. Pspice modeling has been used in the inverter loss prediction, and for the machine loss analysis, finite element analysis (FEA) is employed. All the analytical research of the machine drive system power loss has been verified by calorimetric measurements. This paper provides...
This paper presents an investigation into the losses in a three-phase induction motor under different pulse width modulation (PWM) excitation conditions. The impacts of sinusoidal PWM, space vector PWM and discontinuous PWM on machine loss are compared and studied. Finite element analysis simulations are employed to predict the machine losses with the loss breakdown analysis under different PWM schemes...
This paper presents the results of an investigation into the impact of pulse width modulation (PWM) switching schemes on power losses in induction motors and their inverter drives. The PWM schemes considered include sinusoidal PWM, space-vector PWM and discontinuous PWM. Both experimental results and simulated predictions are presented for fractional horsepower and small integral horsepower motors...
This paper quantifies effects of using three different pulse width modulation (PWM) schemes on the losses in the inverter and induction motor of a 1 kW drive. Direct measurements of losses have been made with a calorimeter. Results show that for the inverter, discontinuous PWM excitation reduces losses by up to 15% compared to sine and symmetrical space vector PWM methods. However, at a low modulation...
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