Application Cases

[Overview]

In this study, a power amplifier was used to build an experimental platform for frequency-response curve testing. Two types of ultrasonic motors—rotary and linear—were designed and tested. Through stator modal testing, mechanical output characteristic experiments, and system integration, it was verified that the developed motors meet the key requirements for laparoscopic driving, including torque, thrust, and resolution, confirming their feasibility as direct drive sources for magnetically anchored laparoscopic instruments.

Experiment Name: Output Characteristics and System Integration Experiment of Rotary and Linear Ultrasonic Motors for Magnetically Anchored Laparoscopic Applications

Experiment Objective: This study aims to verify the performance of two designed ultrasonic motors (rotary and linear) as direct drive sources for magnetically anchored laparoscopic instruments through stator modal simulation, harmonic response analysis, and prototype output characteristic testing. Key performance indicators include torque, thrust, and motion resolution. Finally, an integrated system is built to verify the feasibility of their application in single-port laparoscopic surgery.

Test Equipment: Laser vibrometer, signal generator, power amplifier, infrared non-contact measuring instrument, laser displacement sensor, load test platform, and a magnetically anchored laparoscopic camera system platform integrating a magnetic anchoring module, laparoscopic robot, and control system.

Experiment Procedure: First, COMSOL software was used for simulation to determine the stator operating modes, which were verified through sweep-frequency experiments using a laser vibrometer. Subsequently, a test platform was built to measure key characteristic curves of the rotary and linear ultrasonic motors under specific voltages and preloads, including frequency–speed, speed–torque, and speed–load curves. Data such as maximum torque (0.51 mN·m) and maximum thrust (107.8 mN) were obtained. Finally, the motors were integrated into the magnetically anchored laparoscopic system, and their motion resolution was tested (rotary: 5.5 mrad; linear: 24 μm), comprehensively verifying their performance as drive sources.

Figure 1. System block diagram of the frequency-response curve test platform

Figure 2. System block diagram of the motor output characteristic experiment platform

Experiment Results: The magnetically anchored laparoscopic driving scheme based on ultrasonic motors can achieve high-precision motion control. The rotary ultrasonic motor, at a driving voltage of Upp = 100 V, delivers a maximum output torque of 0.51 mN·m and a minimum motion resolution of 5.5 mrad. The linear ultrasonic motor, at a driving voltage of Upp = 200 V, delivers a maximum thrust of 107.8 mN and a minimum displacement resolution of 24 μm. The output performance of both motors meets the preset driving requirements, and they have been successfully integrated into the magnetically anchored laparoscopic system, verifying their feasibility as direct drive sources for laparoscopes.

Figure 3. Frequency response test results of the ultrasonic motor stator

Figure 4. Speed–torque curve of the rotary motor

Figure 5. Speed–load curve of the linear motor

Figure 6. Motor resolution experiment results

Product Advantages of Aigtek Power Amplifiers in This Application:

1. High voltage output capability — Fully meets the motor driving requirements.

2. Wide bandwidth and flat response — Precisely matches stator operating mode sweep-frequency verification.

3. Four-quadrant output and low distortion — Stably drives capacitive loads, ensuring accuracy verification of motion resolution.

[Recommended Product]: ATA-300/3000 Series Power Amplifier

Figure: Specifications of the ATA-300/3000 Series Power Amplifier

The experimental materials in this article were compiled and published by Xi'an Aigtek Electronics. Aigtek has become an instrumentation supplier with a broad product portfolio and considerable scale in the industry; demonstration units are available with free trial support. Xi'an Aigtek Electronics is a high-tech enterprise specializing in the R&D, manufacturing, and sales of electronic test instruments including power amplifiers, high-voltage amplifiers, power signal sources, preamplifier/miniature signal amplifiers, high-precision voltage sources, and high-precision current sources.