Application Cases

Experiment Name: Application of ATG-2042 Power Signal Source in Basic Research on Ultrasonic Motors for Micro-Rotor Aircraft

Experiment Objective:
To address the existing problems of power systems in micro-aircraft, a multi-spoke thin-plate rotary ultrasonic motor based on in-plane standing wave drive was designed. Finite element methods were used to optimize structural parameters, and modal planning and analysis of the piezoelectric vibrator were conducted. The results indicate that the motor has a simple structure and an equally simple excitation method.

Experimental Equipment: ATG-2042 power signal source (signal generator + power amplifier), oscilloscope, piezoelectric vibrator under test, computer, microcontroller, laser emitter.

Experimental Procedure:
Based on the driving principle of the piezoelectric vibrator, applying the same excitation signal to the upper and lower piezoelectric ceramics of the vibrator causes the vibrator to oscillate. The tips of the spokes at the top of the stator then generate micro-elliptical motion, which drives the rotation of the rotor shaft.

Here, the power signal generator was used directly as the power signal source to simplify the experimental setup. An oscilloscope was used to monitor the voltage and frequency of the excitation signal actually applied to the piezoelectric vibrator. The ultrasonic motor prototype was fixed to a base using hot glue at the vibration nodes of the piezoelectric vibrator to minimize interference with vibration.

Figure: Experimental Setup for Frequency Sensitivity of the Prototype Motor

Experimental Results:
The optimal operating frequency band of the piezoelectric vibrator was found to be between 98.3 kHz and 98.7 kHz. Within this frequency band, the motor speed reaches its maximum and remains essentially constant. An operating frequency bandwidth of 0.5 kHz effectively avoids issues such as operating frequency drift caused by assembly errors.

Figure: Relationship Between No-Load Speed and Driving Frequency of the Prototype Motor

Figure: Specifications of the ATG-2000 Series Power Signal Source