Abstract:
Positive torque of a Switched Reluctance Motor
(SRM) can be developed by energizing the stator winding
during the positive slope of the phase inductance. Due to the
inductive nature of the circuit, demagnetizing process can not
make the phase current turn off instantly so negative torque is
also generated. To minimize the negative torque, negative
voltage can be applied during demagnetizing process of the
phase winding to reduce the current faster. A capacitor is
commonly used to realize it in C-dump converter topologies. A
C-dump converter without inductor utilizes a capacitor voltage
to turn off the active phase winding and then returns the stored
energy into the next phase winding, therefore it is more
efficient. This paper describes the influence of the capacitor
voltage of a C-dump converter on the phase current reduction
under demagnetizing mode. A simple control strategy is also
proposed to keep the capacitor voltage in the specific level
without a voltage detector. To verify the analysis, finally
simulation works were done. The results show that a C-dump
converter with smaller capacitance has greater voltage
fluctuation therefore it is capable to minimize the negative
torque developed by the motor.
Citation:
Riyadi, S., & Pratomo, L.H. (2018). The influence of capacitor voltage fluctuation on energy efficient C-dump converter. In R. Samarasinghe & S. Abeygunawardana (Eds.), Proceedings of 2nd International Conference on Electrical Engineering 2018 (pp. 38-43). Institute of Electrical and Electronics Engineers, Inc. https://ieeexplore.ieee.org/xpl/conhome/8528200/proceeding