Compact permanent magnet rotatable armature generator designed for teaching the basic structure and working principles of AC and DC generators. Key features Purpose built for education: Demonstrates generator structure and operation for junior physics and elementary natural knowledge classes. Clear, handson operation: Manual hand wheel drives the rotor through a belt and small pulley for direct observation of mechanical to electrical energy conversion. Switchable AC and DC output: Elastic phosphor copper sheet brushes can be repositioned on the commutator to obtain either AC or DC output during demonstrations. Robust construction: Stator uses two barium permanent magnets with clearly identified poles, red for N pole and blue for S pole. Rotor armature includes a rotating shaft, coil frame, wound wire, and small pulley. Stable base and wiring: Base plate is fitted with a durable doublesided board and complete terminal board for convenient connections and secure mounting. Performance and specifications Size: 29 x 16 x 18 cm Weight: 830 g Rated rotor speed: 1200 to 1600 rpm Electrical output: Noload voltage not less than 6 V; under load not less than 3 V at 0.3 A Materials: Barium permanent magnets in the stator; elastic phosphor copper sheet for brushes; standard coil winding on the armature. Why this product solves teaching needs Makes abstract concepts concrete: Students can directly observe the interaction between magnetic field, rotating armature, and brushes while measuring voltage output. Versatile demonstration tool: Easy switching between AC and DC modes allows comparison of waveform and commutator function in one instrument. Safe, lowvoltage output suitable for classroom use and student experiments. Practical use scenarios Classroom demonstration: Teacherdriven experiments showing magnetic polarity, induced voltage, and the effect of rotor speed on output. Student lab exercises: Handson experiments to measure noload and loaded voltages, explore AC versus DC generation, and study brush and commutator roles. Science fairs and projects: Portable, selfcontained unit for student presentations and independent investigations into generator principles. Care and precautions During demonstrations, ensure correct brush pressure on the commutator to prevent poor contact or sparking. When not in use, remove and store the Otype belt to prevent premature wear. Keep the belt away from oil and direct sunlight. Periodically lubricate bearings to maintain smooth rotation and extend service life. Handle magnets and wiring carefully to avoid damage to coils and magnetic surfaces. What is included in the instrument structure Stator: Twopiece barium permanent magnet assembly with pole indicators. Rotor: Armature assembly with shaft, coil frame, wound wire, and small pulley. Brushes: Elastic phosphor copper sheet brush assembly for selectable AC or DC output. Base plate: Doublesided board with mounted machine components and power generation terminals. Manual mechanism: Hand wheel and wheel frame connected to the rotor via belt and pulley. This instrument provides a practical, reliable way to demonstrate generator fundamentals, suitable for classroom instruction and student experiments.