Application Cases

Experiment Name: Application of ATA-4051 High-Voltage Power Amplifier in Performance Testing of Non-Resonant Piezoelectric Linear Motors

Research Direction: Piezoelectric Actuation

Experimental Content:
Performance testing of a non-resonant piezoelectric linear motor driven by a piezoelectric stack. The linear motor structure employs a two-stage amplification mechanism to amplify the output displacement of the piezoelectric stack. Additionally, the structure adopts an alternating driving method to enhance the driving efficiency of the stator. A square wave signal is used as the excitation signal, and the stator's driving foot drives the guide rail motion through friction, testing the output performance of the motor while identifying the optimal excitation signal frequency.

Testing Equipment: Signal generator, ATA-4051 high-voltage power amplifier, magnetic scale displacement sensor, piezoelectric stack, etc.

Figure: Experimental Platform

Experimental Procedure:

Figure: Motor Structure Diagram

The motor stator is fixed to the base using bolts, and preloading force is applied to the guide rail via a micrometer. The non-resonant piezoelectric linear motor requires a two-phase signal to drive the stator. An experimental platform was established using a signal generator, an ATA-4051 high-voltage power amplifier, and a magnetic scale displacement sensor to test the motor's output performance. A square wave signal generated by the signal generator was amplified by the power amplifier to drive the stator. The magnetic scale sensor measured the displacement of the guide rail, and a semi-physical simulation system was used for data acquisition.

Test Results:
A voltage of 135 V was applied to the piezoelectric stack, and the motor's output performance at different frequencies was tested by varying the frequency. The experimental results indicate that the motor achieves optimal output performance at an excitation frequency of 70 Hz. Beyond 70 Hz, the output performance gradually decreases due to the hysteresis of the piezoelectric stack and the damping generated by the stator itself.

Furthermore, by applying a fixed frequency of 70 Hz and varying the voltage, the motor's output performance under different voltages was tested. The results show that the motor exhibits good linearity above 60 V, reaching a maximum speed of 5.53 mm/s at 135 V. Compared to other non-resonant piezoelectric linear motors, this motor achieves a higher output speed.

Figure: ATA-4051C High-Voltage Power Amplifier Specifications and Parameters