Permanent magnet rotatable armature generator teaching instrument Overview This compact, manual generator is designed for classroom demonstration and handson study of AC and DC generator principles. It combines a permanent magnet stator, rotatable armature, adjustable brushes, and a manual drive mechanism on a stable base for clear, repeatable demonstrations. Key specifications Dimensions: 28 x 18 x 17.5 cm Weight: 830 g Rated demonstration output: at rotor speed 1200 to 1600 rpm the noload voltage is at least 6 V; under a 0.3 A load the output is at least 3 V Core components and materials Stator: Twopiece barium permanent magnet assembly with colorcoded poles for easy identification; red marks the N pole and blue marks the S pole. Rotor: Armature with rotating shaft, coil frame, wound wire, and small pulley for belt drive. Brushes: Elastic phosphor copper sheet brushes; brush position is adjustable to produce AC or DC output. Base plate: Rigid doublesided board mounted with the complete electrical and mechanical assemblies for stable operation. Manual mechanism: Hand wheel and wheel frame on the base plate drive the rotor via a small pulley and O type belt. Key benefits Teaches fundamental concepts: Demonstrates magnetic fields, armature induction, commutation, and the difference between AC and DC in a single unit. Visible and adjustable: Colorcoded magnets and movable brushes let students see and control how generator behavior changes with brush position and rotor speed. Safe, lowvoltage output: Produces voltages suitable for classroom experiments while delivering measurable performance under load. Compact and portable: Small footprint and light weight make it easy to move between classrooms or lab stations. Durable construction: Robust components and simple manual drive make the unit suitable for repeated use in educational settings. Performance and operation notes Adjustable brush position allows direct demonstration of AC generation when brushes contact the slip ring and DC generation when positioned on the commutator. Typical demonstration speeds are between 1200 and 1600 rpm to reach the specified voltage outputs. Manual driving via the hand wheel provides controlled rotor speed for clear, stepwise demonstrations. Maintenance and handling recommendations Ensure proper contact pressure between brushes and slip rings or commutator during demonstrations. Remove and store the O type drive belt when not in use; keep the belt away from oil and direct sunlight to extend service life. Apply appropriate lubrication to bearings periodically to maintain smooth operation. Typical use scenarios Junior physics class: Live demonstration of how rotating magnetic fields and armature windings generate alternating and direct current, with handson student interaction. Elementary school natural science activities: Simple experiments to illustrate electricity generation and magnetism using a manually driven, visible generator. Vocational or introductory laboratory: Practical training on generator components, brush adjustment, and basic measurement under load. What this instrument is for This product is intended for educational use to teach the basic structure and working principles of AC and DC generators. It provides a durable, portable, and easytooperate platform for instructors and students to explore electromechanical generation concepts.