Abstract
This paper presents an evaluation method of performance characteristics in terms of loss, currents and electromagnetic torque of an unsymmetrical two-phase induction motor driven by a three-leg Voltage Source Inverter (VSI) providing unbalanced two-phase voltages. The model parameters for consideration of loss and dynamic performance of the motor are estimated by using Genetic Algorithm (GA). Also, synthesized winding current waveforms based on a~superposition method and frequency domain of known harmonic voltages are investigated. The methodology of the proposed GA applied to parameter estimation of the unsymmetrical two-phase induction motor is fully given. Carrier-based unbalanced Space Vector Pulse With Modulation (SVPWM) is employed and implemented on a~low-cost microcontroller. In order to prove the validity of the model with the parameters obtained by GA, performance comparison with the experiment and the model with the parameters obtained by conventional test in laboratory has been made. The results of simulation with the proposed parameters and experiment are in good agreement.
Highlights
Nowadays, Single-Phase Induction Motors (SPIMs) are commonly used for low power applications in domestic and industrial use such as pumps, fans, refrigerators, air conditioners, etc. because of low cost, ease of use and maintenance
When supplied with the Voltage Source Inverter (VSI), the capacitor run SPIMs having a capacitor connected together with an auxiliary winding will have a limitation of use because some frequencies at a low-frequency range of the VSI may cause a resonance problem resulting from interaction between the capacitor and the auxiliary winding [2]
If the variable speed drives of the SPIMs are required, it is necessary to modify the SPIM as a TwoPhase Induction Motor (TPIM) by removing the capacitor and supply with a three-leg VSI as shown in Fig. 1 ([1], [2], [3], [4], [17] and [18])
Summary
Single-Phase Induction Motors (SPIMs) are commonly used for low power applications in domestic and industrial use such as pumps, fans, refrigerators, air conditioners, etc. because of low cost, ease of use and maintenance. Because of low cost, ease of use and maintenance These motors have several disadvantages such as low efficiency, low power factor and high torque ripple [1]. If the variable speed drives of the SPIMs are required, it is necessary to modify the SPIM as a TwoPhase Induction Motor (TPIM) by removing the capacitor and supply with a three-leg VSI as shown in Fig. 1 ([1], [2], [3], [4], [17] and [18]). Performance like currents, V·Hz−1 control of a TPIM driven by threeleg and four-leg VSIs with a carrier-based unbalanced PWM method has been compared and evaluated [4]. Efficiency optimization control and loss analysis based on equivalent circuits of single-phase motor drives can be found in [6], [7], [8] and [9]
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