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Squirrel-Cage Induction Motor

Fully operational 208 VAC 3-phase squirrel-cage induction motor built entirely from scratch.

Highlights

Overview

    • Entirely hand-fabricated stator core from commercial transformer laminations

    • Custom jig for precise, velocity-controlled coil winding with uniform tension

    • Transparent acrylic enclosure for real-time observation of rotor spin and dynamics

    • Successful operation on 208 V 3-phase mains with adequate torque output

This project was a custom-built squirrel-cage induction motor developed in equal collaboration with three teammates for our university 'Electric Machines' class. The assignment required designing and fabricating a fully functional motor from scratch — nothing pre-made or purchased. We hand-cut, varnished, and stacked commercial transformer laminations for the stator core, wound coils on a custom velocity-controlled jig, and built the squirrel-cage rotor. Transparent acrylic side panels on both sides allowed direct observation of the spinning rotor.
We first tested at low voltage on a 48 VAC 3-phase source to confirm rotating magnetic fields, then connected directly to a 208 VAC 3-phase outlet, where it successfully operated and produced clear, sustained rotation with adequate torque.

Development Process

Technical deep dive / Process

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All files are open-source under MIT license — feel free to fork, adapt, or use commercially (attribution appreciated).

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EM

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