Torque Motor
Power-Dense & Precise
Torque Motor
A torque motor is a frameless Brushless Direct Current (BLDC) Motor that is specifically designed for high torque, low speed and precision applications. These motors can typically operate at very low, or even at zero speed operation points (stall torque). A high number of poles helps to improve low speed torque, and increase positioning precision, and they also normally have larger inner diameter and a compact shape.
Alvas SlimTorq™ motors are an excellent fit within this category. Thanks to the FiberPrinting™ technology, it’s possible to create ultra-slim, slotless motors with a high number of poles.
Utilizing the non-skewed windings and the high copper fill factor, the motors are lightweight with exceptional torque density, a large inner diameter, and outstanding precision performance. Alva’s automated slotless winding technology allows for operation points that are not only at the low speed range, but also at very high speeds, making it a bit for many geared applications too.
SlimTorq™
Torque Motors
Alva has a range of standard SlimTorq™ products. These motors cover different sizes (from 25 to 160 mm in diameter), different winding configurations, different termination directions (axial or radial) and with different sensor options (temperature sensor and Hall effect sensors). Most of the motors can also be configured in a lightweight version, Lite, and a version optimized for torque output, Max.
With these options, the SlimTorq™ product range covers most of the application needs on the market, and can be configured to handle most use cases. Even if the motor requires high torque at low current draw, or needs to spin really fast, a motor with the correct winding configuration can be found. With the use of the product catalog and the product selector, the standard product range is easily navigated to find a good match for any project.
Custom Torque Motors
Due to the fact that the FiberPrinting™ technique is very flexible, custom motors are easily designed and manufactured. Just by changing the length, the width, the thickness and the winding configuration of the stator mat (winding), and the size and pole count of the magnets, a completely new motor can be created. This opens up the possibility to optimize motors for specific applications. It could mean building a motor with the perfect size, maximizing the target weight, or trying to create a motor that is as small and lightweight as possible. Combine this with the opportunity to optimize for efficiency, high torque constant, specific voltage constant or anything else, and the options are endless.
Alva has developed a design tool called Rapid Design Tool (RDT) to create these custom designs and analyze possible options. This tool is not only fast, but accurate, accelerating the time from idea to a concept which then can be tested as a prototype if found suitable. Motor designs that were impossible before, Alva makes now a reality.
| Header | Header | Header | Header |
|---|---|---|---|
| Cell | Cell | Cell | Cell |
| Cell | Cell | Cell | Cell |
| Cell | Cell | Cell | Cell |
| Cell | Cell | Cell | Cell |
Alvas motors cover a wide range of sizes and can be customized if needed. The table gives a brief insight to the different motor specifications and capabilities of the standard variants. If there are any questions or uncertainties in picking a motor, please contact us directly for assistance.
Torque Motor Applications
Alvas torque motors are used in a wide range of applications in many different markets. Everywhere where it’s needed to have maximum torque in a compact and lightweight package, or where high precision is key, the SlimTorq™ motors fit perfectly. The following is a list of typical applications:
- Humanoids and other robotic joints
- Gimbals and stabilized platforms
- Semiconductor equipment
- Metrology devices
- Medical devices
- Prosthesis
- Additive manufacturing
- Marine thrusters
- Propulsion systems
- Exoskeletons
- Surgical robots
- Aerospace applications
- Space and Satellite Communication
These are only examples and the list can be extended further. The highly efficient and versatile SlimTorq™ motors are easily integrated into any application and creates motion where it's needed. The large ID offers space for tight integration with absolute encoders, slip rings and sensors, and reduces the overall size and weight of the system.
Typically 16-20 weeks from confirmed specifications to first prototype.
-40 to 80 degrees celsius ambient temperature for standard motors. Extended temperature versions are possible as custom designs.
Typically 6-8 weeks.
Yes, we can both supply standard torque motors for testing, but also specific evaluation kits which are delivered with housing, bearings, encoder and sensors for easy and quick setup.
Get in Touch
Talk to an engineer or request a quote today.
All rights reserved ©2025