A perpetual motion machine（永动机） is a hypothetical machine that can operate indefinitely without the need for external energy input. However, according to the laws of conservation of energy and thermodynamics, a perpetual motion machine is impossible to achieve.
      The significance of this model is to show people what an ideal perpetual motion machine looks like, and it can also be used for physics experimental teaching.

2025.2.11update：The new version of the rotating disk has been updated, the steel balls run more smoothly and are not easy to fall off.

Assembly BOM：

1. 608 Bearing 1x
2. N20 reduction motor 1x
3. 10mm Steel Ball 8x
4. Battery Box No.7 
5. KCD11 rocker switch
6. M3×6 screw  4x

Description：

1. The rotation direction of the model is clockwise.
2. It is best to choose an N20 deceleration motor with a speed of around 50 revolutions per minute.
3. Can use 3.7V lithium battery or 7th battery box, 5th battery box cannot be used.
4. The text part can be colored with acrylic pen or paint pen, and paint pen has better effect.