Performance analysis of an asymmetrical phase-converter-fed induction motor

Abstract

Of the various types of single-phase-to-three-phase static converters used to interface a three-phase motor to singlephase supply, one simple type uses an open delta connection of a sinusoidal supply and a pulsewidth modulated (PWM) waveform to feed the motor. This paper presents an analysis of the performance of the three-phase motor when fed from such an asymmetrical supply. The analysis is based on the steady-state approximate-equivalent circuit of the motor, using the method of symmetrical components. The analysis is directed toward prediction of motor phase and line currents, along with the nature of generated torque. The computer-simulated waveforms are presented and compared with results from tests on a laboratory setup.

Modulation Strategies for a Low-Cost Motor Drive

“…In the case that the zero-sequence signal is the one given by (3), the same results as standard SVM are obtained. Sa Sb Sc (5) The modulation signals are integrated by the original modulation signals ( V, ) plus the zero-sequence signal (v 4)' vmi = v1i + vzss i={r, a, b, c}. Furthermore, in the steady state condition, it is accomplished that Vma + Vmb + Vmc = 0 Taking into account that the inverter phase currents are i = + izss = i'+ ig/3 , for i {a, b, c}, and ia +ib +i =0 then (7) C. Discontinuous P WM (DP WM) In the DPWM methods, a proper zero-sequence signal is also injected to the modulation signals.…”

“…Technical University of Catalonia Catalonia, SPAIN amount of switches not only increases the cost of the system, but also reduces its reliability [4], [5]. This paper investigates the use of one configuration that has a reduced number of power switches and passive components [1]- [7].…”