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Electrical motor fed by voltage source inverters has been known to face transient overvoltage problems caused by the inverter switching operations. With the parallel inverter topology and with the modulation strategy presented in thisstudy, the motor terminal overvoltage can be reduced without any passive filtering. The parallel inverter topology has individual motor leads from each inverter connected...
Active du/dt filtering method can reduce the size of filter component physical size, and achieve superior filtering results. This enables very low overvoltage with long motor cables. The losses and power dissipation associated with the method is addressed. A comparison with passive filters is introduced, and silicon carbide components evaluated. The use of silicon carbide free-wheeling diodes results...
Active du/dt is a new output filtering method to mitigate cable reflection based motor overvoltages. The target in active du/dt is to minimize the passive filter in terms of size and weight, and to provide better filtering performance than with conventional passive approaches. The active du/dt method uses a passive LC filter circuit at the output of the inverter with additional active control for...
Frequency converters are used to increase the controllability and efficiency of electric motor drives. Induction motors may experience an insulation failure caused by an overvoltage at the motor terminals. The overvoltage is caused by an impedance mismatch between the motor terminals and the motor cable. Fast pulse rise times compared with the propagation delay in the motor cable will make the terminal...
Cable reflection phenomenon in inverter-fed electric drives and typical solutions to the problem are presented in brief. Application of a new active du/dt filtering method based on a low-loss LC circuit and active control to eliminate the motor overvoltages is discussed in this paper. Active du/dt basic principles are presented along with experimental results to verify the potential of the concept...
In this paper, we present a high-speed optical gate drive scheme for three-phase inverter. The gate drive signal is transmitted from control board to gate drivers with a frequency-shift keying modulation, using optical fiber. This gate drive signal transmission method is used with a commercial high-speed gate driver integrated circuit. The gate drive system is capable of producing minimum output voltage...
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