Motor principle demonstration teaching aid

The utility model discloses a motor principle demonstration teaching aid, including permanent magnet, base, rotary switch, battery, bracing piece, coil, recess, brush and pivot, the permanent magnet is installed in the both sides of base, and the permanent magnet can add, and the permanent magnet of lower floor is fixed on the base, the base right side is equipped with rotary switch, and inside is equipped with the battery, and the surface is equipped with the bracing piece, rotary switch can open the switch and can adjust again and hold battery?output voltage, the bracing piece is the retractable bracing piece, and the bracing piece is inside to be hollow for wear the wire, the bracing piece is equipped with the recess topmost, is equipped with two brushes in the recess, and the wire is connected on the brush, the coil is multi turn coil, and the coil lower extreme is equipped with the pivot, and the pivot is clearance fit with the recess, the utility model discloses can the audio -visual structure of demons