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Soft Starting of a Modified Three-Phase Induction Motor with a Single-Phase Synchronous PWM AC Chopper
Author(s)
Date Issued
January 1, 2025
Type
Conference Paper
Abstract
This paper presents a soft starting method for a modified three-phase induction motor using a single-phase synchronous PWM AC chopper to reduce starting current and electromagnetic torque pulsation. The modified motor functions as a single-phase induction motor due to the lack of a three-phase source and employs an appropriate capacitor. The synchronous single-phase PWM AC chopper provides several benefits over traditional thyristor soft starters, including a linear relationship between fundamental voltage and modulation index, improved voltage control, and lower harmonic currents. A cost-effective microcontroller gradually increases the duty cycle to create PWM signals for soft starting, achieving nearly a 65% reduction in starting current compared to direct online starting. Simulation and experimental results confirm enhanced starting performance, making it suitable for applications such as water and air pumps.
Citation
Proceedings Ieecon 2025 2025 13th International Electrical Engineering Congress Carbon Neutrality Challenges and Solutions Based on Sustainable Power of Nature, 2025