Design of Single-Phase Induction Motor Soft Starter with Closed Loop Method Using Arduino Microcontroller

Ardhito Primatama (Universitas Islam Negeri Maulana Malik Ibrahim Malang)
Lutfir Rahman Aliffianto (Institut Teknologi Sepuluh Nopember Surabaya)
Ciptian Weried Priananda (Universiti Malaya Kuala Lumpur)

International Journal of Electrical and Intelligent Engineering
Vol 1, No 1 (2025)

A closed‑loop soft‑starter for a 220 V/0.5 hp single‑phase induction motor driven by an Arduino micro‑controller and dual feedback (current + speed) is presented. Relative to direct‑on‑line (DOL) starting, the prototype halves the in‑rush current under no‑load conditions (6.62 A versus 3.30 A) and reduces it by 36 % when the motor drives a synchronous generator (8.28 A versus 5.33 A). Starting torque is maintained at ≥ 90 % of the DOL value in both scenarios, whereas transient time rises modestly from 0.77 s to 2.32 s (no‑load) and to 7.92 s under generator load. These findings demonstrate that the proposed soft‑starter mitigates voltage sag and mechanical stress without compromising torque, making it suitable for small‑enterprise applications where three‑phase supplies are unavailable.