Permanent Magnet Rotating Magnetic Field Demonstrator This classroom and laboratory demonstrator is designed for physics and electrical teaching. It helps students observe and measure behavior in AC circuits while visualizing magnetic field behavior. The unit consists of a bracket and a hoofshaped permanent magnet mounted on a fixed shaft. The blue face of the magnet marks the S pole and the red face marks the N pole. Key benefits Makes abstract concepts tangible: visually connects alternating currents and field rotation so students grasp how rotating magnetic fields form. Supports handson measurement: intended for student experiments that include measuring current in AC circuits, allowing correlation between measured currents and observed field effects. Clear, simple construction: bracket and hoofshaped permanent magnet assembly is easy to install on a lab bench and integrate with existing experiment rigs. Effective teaching aid: designed to demonstrate the principle behind threephase induction motors in a compact, lowcomplexity form. Main functions and attributes Function: Demonstrates the nature of a rotating magnetic field and illustrates the operating principle of a threephase induction motor for educational use. Components: Bracket and hoofshaped permanent magnet with a fixed shaft. Colorcoded poles provide immediate visual reference: blue equals S pole, red equals N pole. Compatibility: Intended for use with standard physics and electrical teaching equipment and AC circuit measurement tools used in student laboratories. Performance: Provides a visible and physical representation of magnetic polarity and rotation effects to complement electrical measurements made during AC circuit experiments. Nature of the rotating magnetic field A rotating magnetic field is a magnetic field whose direction changes continuously in space and time. In teaching setups, alternating currents shifted in phase create a field vector that appears to rotate when observed from a fixed point. This demonstrator makes the concept accessible by providing a clear magnetic dipole and a mounting that mimics the spatial reference used in motor theory. Principle of the threephase induction motor In a threephase induction motor, a rotating magnetic field produced by phaseshifted AC currents sweeps past the rotor conductors. Relative motion between the rotating field and the rotor induces currents in the rotor. Those induced currents interact with the rotating field to produce force and torque, causing the rotor to turn. The demonstrator connects these ideas to measured AC currents and visible magnetic poles so students can link theory to observation. Practical use scenarios Classroom demonstration: Instructor places the demonstrator on a lab table while showing how threephase AC sources produce a rotating field and linking the observation to measured currents. Student laboratory experiment: Students measure current in an AC circuit while observing the demonstrator to relate waveform phase relationships and amplitude to field behavior. Technical training session: Use as a handson module to explain induction motor fundamentals to trainees learning motor diagnosis and fundamentals of electromagnetic induction. Notes on handling and setup Install on a stable bench or mounting point and position measurement equipment so students can simultaneously observe the magnet and record AC circuit currents. Observe standard precautions when handling strong permanent magnets to avoid pinching or unintended attraction to ferrous objects. This demonstrator provides a straightforward, visual, and measurable way to teach rotating magnetic fields and the operating principle of threephase induction motors in physics and electrical laboratories.