Because of its simple structure and ease of assembling, this motor can easily be stacked to get higher power. Figure 4 shows an example of stacked motors. The motor in figure 4 has 40 layers. Figure 5 shows the internal structure of the stacked motor. Stator films and slider films are stacked together with spacer films, and their edges are held by metal pins and acrylic plates. Interval between each stator film (or each slider film) is 0.35mm. To utilize both surface of stator films, each layer consists of one stator film and two slider films as shown in the figure. So, the total number of stator films are 40, whereas the number of sliders are 80.
The metal pins for stator works also as electric feed. Stator electrodes are connected to those metal pins via washer made of conductive rubber.
Whole motor (figure 4) are held in plastic case and immersed in dielectric liquid. Both side of slider are connected to output wires, which lead to outside of the case. Thrust force is transmitted through these wires.
The total weight of the motor, including case and dielectric liquid, is 110g.
Results of measurements of thrust force and power are described in the following.
Figure 6 shows a relationship between voltage and thrust force when the motor is driven at 10Hz. The motor could operate over 100V applied voltage, and its thrust force was proportional to square of applied voltage. The maximum applicable voltage was limited under 800V due to dielectric breakdown of stator film.
Figure 7 shows characteristics of thrust force and power against operation frequency. The plot was obtained at 800V applied voltage. We obtained larger thrust force at lower frequency, and maximum thrust force was 8N. Power was larger at higher frequency, and maximum power was 0.5W.
0 comments:
Post a Comment