WLG-20-R Motor

Introducing the WLG-20, Tekceleo’s miniature high-performance ultrasonic motor offering exceptional torque-to-size ratio.With our advanced WAVELLING® technology, the WLG-20 delivers unmatched precision and control for your motion needs.

Its very compact size (20 mm) and powerful torque make it the perfect choice for applications where space is limited, and performance cannot be compromised. Discover the power and reliability of the WLG-20, and take your motion system to the next level.

High Performance
Ultrasonic Motor

The WLG-20-R ultrasonic motor is the perfect solution for creating motion systems in highly complex environments where space is at a premium.

Its miniature size, combined with its high-performance capabilities, make it the ideal choice for a wide range of applications, including surgical robots, miniature pump, and other medical devices, as well as industrial automation and aerospace systems. Additionally, the WLG-20-R is non-magnetic, making it the perfect choice for applications in sensitive environments, such as inside MRI bores.

With its exceptional performance and versatility, the WLG-20-R is the ultimate choice for engineers looking to push the limits of motion system design.

Highlights of our WLG-20-R Ultrasonic Motor

High torque-to-size ratio for compact solutions

Smooth and quiet operation

Customizable design to meet your specific application requirements

Superior accuracy and precision for high performance applications

High durability and long lifespan compared to other USM solutions

Easy to control, with a closed loop on velocity and position

Direct Drive to make engineers live easier

Versatile performances and shape, making it perfect for robotics system

High holding torque, perfect for ernergy efficiency in intermittent operations

Bringing Motion To the Edge

Unique Non-Magnetic
Miniature Actuator

Based on a progressive wave actuator technology coupled with integrated control sensors, Tekceleo’s motors are among the most efficient on the market in terms of torque-to-weight ratio, ease of control in « Direct Drive », combining speed, precision and robustness.

Focus on Innovation

At Tekceleo, we pride ourselves on our engineering expertise and customer support. Our team of experienced engineers is dedicated to helping you find the right solutions for your unique needs.

Whether you have questions about the WLG-20-R ultrasonic motor or need help integrating it into your system, we are here to help. We offer personalized support and guidance throughout the entire process, from selection to implementation.

Contact us today to learn more about the WLG-20-R and how it can improve the performance of your equipment. We look forward to hearing from you and helping you achieve your goals with the best possible motor solution.

Our technology overview

Piezoelectric Ultrasonic Motors with built-in encoder

Tekceleo’s motors are renowned for their progressive wave actuator technology and integrated control sensors, making them highly efficient in terms of torque-to-weight ratio, and easy to control in “Direct Drive.”

With a wide range of performance capabilities, our WAVELLING® technology allows for nominal speeds ranging from a few RPM to 600 RPM depending on the motor type, without the need for a reducer, ensuring minimal backlash or jerks. Our piezo motors are among the best in class for low speed/high torque ratios, with a unique expertise in very small rotary piezo actuators.

As a pure mechanical actuator, our motors operate without any electromagnetic fields or ferromagnetic materials, making them ideal for use in applications where these materials are not suitable. The rotor is moved by a progressive wave of a vibrating stator with multiple continuous contact points, providing an excellent balance between size, power, and precision.

TEKCELEO offers the following actuators, all of which allow non-magnetic configurations for MRI environments:

WLG-75-R, 75 mm diameter motor​

WLG-30-R, 30 mm diameter motor​

WLG-20-R, 20 mm diameter motor​​

All of our drives incorporate speed/position sensors and can incorporate torque sensors depending on the application.

Technical Characteristics


WLG-75-R has one of the best nominal performances of USM in the market

Max Speed : 380 RPM
Nominal Speed : 265 RPM

Rated Power : 0,55 W

Max Torque : 30 mN.m

Holding Torque : 40 mN.m


High accuracy and stability directly achievable with the built-in encoder

Built-in encoder, optical with quadrature output

Max encoder resolution: 0,0620°/1091 µr

Custom max encoder resolution : 0,0156°/273µr

Rate stability : +/- 0,01%


Compact and versatile motor for uses in most environment.

Operating Voltage : 9 VDC

Maximal Power Consumption: 9 VDC/0,8 A

Weight : 14 g

Operating temperature : 0°C - 45°C


Closed loop control on position and speed. Very good latency for positioning.

Control method : closed loop on velocity and position

Start/Stop latency : <500 µs

Speed Change latency : <50 ms

Speed Setting External Voltage : DC 0[V] 〜 3.3[V]

Write Us

TEKCELEO has created a highly innovative team with a recognized know-how in mechatronics and piezoelectric technology. The company is composed of a multidisciplinary team of engineers and physicists who have all the necessary tools to integrate the various technologies composing a product: mechanics, plastics, thermics, electronics, embedded software…

TEKCELEO has an electronics laboratory with scientific analysis and control equipment, latest generation design and simulation software and a mechanical prototyping and production workshop.

Examples and Applications

Miniature technology for light robotics and surgical robotics: Multi-axis robotic arms (torque control), robotic arms with force feedback (haptics), miniature robotic arms, probe positioning (MRI compatible)

Aerospace: Cubesat – Nanosatellite for space research, vacuum-resistant actuators

Optronics and Optomechanics: Alignment of optical systems, camera support (support/stabilization), laser beam control

MRI guided neurosurgical robotics platform. Ideal to fit inside the MRI bore, even around the head of patient

Piezoelectric valve and mini-pump: Fast multi-channel low consumption piezoelectric valve, mini-dosing pump (pipetting, precise distribution, drop on demand, mini fluidics, etc.)

Positioning: Motorization for an XY table, hexapod, actuators for active vibration control

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