Application Cases

Research Direction：

Precision Positioning and Micro-Displacement Control, Ultrasonic motor and transducer drive, Active vibration control, Optical and Adaptive Systems,Biomedical and Microoperation

Experimental objective：

The performance test of the non-resonant piezoelectric linear motor driven by piezoelectric stack structure was conducted. The structure of the piezoelectric linear motor employed a two-stage amplification mechanism to amplify the output displacement of the piezoelectric stack.

Additionally, this structure adopted an alternating drive method to enhance the driving efficiency of the stator of the driver. A square wave signal was used as the excitation signal, and the stator drive was achieved by frictional force to drive the rail movement. The output performance of the motor was tested, and the optimal frequency of the excitation motor signal was obtained.

Testing equipment：

Signal generator, ATA-4051C power amplifier, magnetic scale displacement sensor, piezoelectric stack

Experimental process：

The stator of the motor is fixed to the base using bolts, and pre-tightening force is applied to the guide rail using a micrometer. For non-resonant piezoelectric linear motors, two signals are required to drive the stator to operate.

An experimental platform is set up using a signal generator, ATA-4051 power amplifier, and magnetic scale displacement sensor to test the output performance of the motor. A square wave signal is generated by the signal generator, which is amplified by the power amplifier to drive the stator to work. The movement displacement of the guide rail is measured using a magnetic scale sensor, and the data is collected using a semi-physical simulation system.

Figure1 Structure schematic of the actuator.

Figure2  Physical diagram of the experimental platform.

Experimental results：

A voltage of 135V was applied to the piezoelectric stack, and the motor output performance was obtained by changing the frequency at different frequencies. The experimental results showed that the motor's output performance reached the highest when a frequency of 70Hz was applied. After 70Hz, the motor's output performance gradually decreased, which was caused by the hysteresis phenomenon of the piezoelectric stack and the damping generated by the stator itself.

The experimental results indicated that the motor achieved the optimal performance at a frequency of 70Hz. Secondly, by applying a frequency of 70Hz to the motor and changing the voltage size, the motor output performance under different voltages was obtained. The experimental results showed that the motor had good linearity after a voltage of 60V was applied, and reached the maximum speed of 5.53mm/s at a voltage of 135V. Compared with other non-resonant piezoelectric linear motors, it has a greater output speed.

Figure3 Speed of the actuator driving guide at differ entfrequencies at voltage of 135 V.

Figure4 Speed of the actuator driving guide under different voltages at frequency of 70 Hz.

The effectiveness of the amplifier in this experiment：

1.High-voltage drive: The low-voltage control signal output by the signal generator is linearly amplified to a maximum of 135V, providing the required high-voltage driving electric field for the three piezoelectric stack assemblies.

2.Waveform fidelity: Amplify a 50% duty cycle square wave signal without distortion within the operating frequency band of 40-90Hz, ensuring the integrity of the driving waveform.

3. Fast Response: Capable of providing sufficient current output, supporting the piezoelectric stack to perform rapid charging and discharging during the step change of the square wave signal (especially the switching at the phase difference T/2), ensuring precise switching of the clamping and driving timing, thereby achieving a resolution of 83 nm.

4.Capacitive load matching: Effectively drives the capacitive piezoelectric stack, ensuring that the stack can still fully deform and reset at high frequencies (70Hz), maintaining the swing amplitude of the foot end, and ultimately achieving a maximum driving speed of 5.53 mm/s.

Application fields：

Precision Manufacturing and Semiconductor Equipment、Optics and Optoelectronic Engineering、Biomedical and Microoperation、Precision Measurement and Instrument Science、Aerospace and Precision Valve Control.