Application Cases

Experiment Name: Inertial Impact Piezoelectric Motor Testing with Vibration Filter

Research Direction: Mechanics

Experimental Content:
High voltage was applied to a laser sensor, which then impacted the piezoelectric motor to observe the motor's step displacement.

Test Objective:
To study the influence of driving voltage, mass, and stiffness on the motion of the piezoelectric motor.

Testing Equipment:
Signal generator, Aigtek ATA-4051 high-voltage power amplifier, impact motor, laser sensor

Experimental Procedure:

As shown in the figure above, to avoid interference from external vibration noise, the entire experimental setup was placed on a pneumatic vibration isolation platform. The sawtooth signal used to drive the impact motor was first generated by a signal generator and then amplified by a power amplifier. The final peak-to-peak value of the driving signal was 40 V, with a bias voltage of 20 V. The laser sensor used to detect the displacement of the impact motor had a maximum measurement resolution of 30 nm, a measurement range of 2 mm, and a maximum sampling frequency of 49.02 kHz. The output data from the laser sensor were saved using software (ILD2300) on a computer.

Experimental Results:
During the experiment, the piezoelectric stack of the impact motor was not protected by a preload mechanism. To avoid mechanical damage caused by tensile stress during operation, the piezoelectric stack was always in a vibration state characterized by rapid elongation and slow contraction. Consequently, as shown in the figure above, the impact motor always moved to the left.

For a driving frequency of 2 kHz, the displacement curves of each part of the impact motor were studied at K = 2.6 × 10³ N/m. The results are shown in the figure below:

Figure: Specifications of the ATA-4051C High-Voltage Power Amplifier