one electromagnet. The electromagnet is manufactured by a winding machine.
The number of turns is 2000 and the coil diameter is 0.12 mm.
The electromagnet is situated according to the position of the fan sheet.
It receives alternating current with a specific frequency so it can generate N-pole and S-pole on both sides periodically.
Fig. 2 shows the dimension of the fan sheet.
L, W and H are the length, the width and the thickness of the fan sheet respectively.
The fan sheet can be made of metal or plastic material.
A cylindrical magnet is attached on the proper position of each fan sheet.
Therefore, the electromagnetic force can be transferred to the magnet and then induce the motion of the fan sheets.
Y is the distance between a tip mass and the free end of the fan sheet.
In Fig. 3, two fan sheets are stationary in the beginning.
The fan sheets move toward the right side when the alternating current is positive.
The fan sheets then come back to the initial position and moves toward the left side when the alternating current becomes negative.
At the end of each period, the fan sheets go back to the initial position again.
The fan length, width, thickness are 50 mm, 15 mm and 0.25 mm, respectively.
The resonant frequency of the model is 60 Hz, which is equal to the frequency of the alternating current supplied to the model.