Demonstration of Three-Phase Armature Winding in Classroom Using a Proposed Portable Hardware Tool

Three-phase armature winding is a very important topic in teaching of rotating electrical machines. Typically, the teaching of the three-phase armature winding in the classroom is used a pure theorem through 2-D or 3-D developed diagram. This paper presents the portable hardware tool for integrating the three-phase armature winding in the classroom. The main components of the proposed portable hardware tool consist of an induction motor, 12 winding coils, an armature winding board, and a mini inverter. It is found that it is cheaper to modify an existing single-phase motor than to build a suitable three-phase induction motor. This paper proposes the method of modifying a single-phase induction motor used in an air conditioner to be a three-phase induction motor. Because of compact size, low weight, low voltage, low current, and reasonable time frame, then it is suitable for a lecturer to carry it and demonstrate the three-phase armature winding in the classroom. This proposed tool makes the teaching and learning of rotating electrical machine a more active by using interactive learning to its real world. The effects of reversing two of three voltage phases and changing their frequencies on rotating electrical machine are also demonstrated. The proposed methods have been successfully integrated into the electric machinery course at Kasetsart University Sriracha Campus.