80
60
80% PWM 40 20 Time (s)
0
1.5 1 0.5 0 Displacement (cm)
6.0 V
120
100
6.5 V
80
90% PWM 60 Time (s)
40
7.0 V
20
0
7.5 V
6 4 2 0
Displacement (cm)
PWM.
120
various
100
80 under
100% PWM 60 40 Time (s) tests
Displacement
20
0
3 2 1 0 Displacement (cm)
16
Fig.