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Miniature Torque Transducers 101

The demands for miniature force and torque measurement solutions are on the rise. Modernization of products along with complex, compact products requires small and robust test and measurement solutions.

Miniature torque transducers are small sensors that measure torque, or rotational force, in mechanical systems. They are used to monitor and control the torque output of motors, gears, and other rotating components. These mini transducers come in various sizes and designs, ranging from simple rotary sensors to complex multi-axis sensors. The range of options provide precise, real-time measurements for all types of torque measurement applications.

COMMON USE CASES FOR MINIATURE TORQUE TRANSDUCERS

  • Quality control: In many manufacturing and smart factory processes, miniature torque transducers can provide real-time measurements of the torque being applied by production machines and equipment, allowing for adjustments to be made as needed in instantly to improve product quality.
  • Performance optimization: By measuring the torque output of a motor or other rotating component, a miniature torque transducer can optimize performance, resulting in improved efficiency, longer lifespan, and reduced maintenance requirements.
  • Safety: In certain applications, it is important to monitor the torque being applied to ensure that it does not exceed a certain limit. This is particularly important in safety-critical applications, where excessive torque can lead to equipment failure and potential harm to people and property.
  • Research and development: Miniature torque transducers assist in testing and validating new products, processes, and technologies. By providing accurate, real-time measurements of torque, these sensors can help to improve product design and performance.

Miniature torque transducers are being used in an increasing number of applications, including in the production and design of automotive and vehicle components, for use with machines and lab equipment, in robotics and industrial automation monitoring, R&D of medical devices, and in testing viability, durability and safety of consumer products. Interface’s event, Taking Measure of Miniature Load Cells, explores the topic of using miniature measure devices.

Interface continues to add new types of miniature torque transducers to our expanding line of these sensor types. In fact, Interface has multiple U.S. patents for our MRT products and our proprietary overload protection designs.

INTERFACE MINIATURE TORQUE TRANSDUCERS

Proven by many Interface customers, our miniature torque transducers can provide valuable and accurate measurement data for a wide range of use cases and applications, making them an important device for engineers across all types of industries.

Robotic Surgery Force Feedback Solution Using Mini Torque Transducers

A biomechanical medical device company needs to test the force, torque, and tactile feedback from their robotic arm used for invasive surgery. A number of Interface’s miniature force and torque measurement products are used on this robotic arm. These include the ConvexBT Load Button Load Cell, SMTM Micro S-Type Load Cell, and the MRTP Miniature Overload Protected Flange Style Reaction Torque Transducer. Force results can be collected when connected to the BX8 8-Channel Data Acquisition and Amplifier, and viewed when attached to the a laptop. Read more about the results here.

Furthermore, the demand for miniature sensors is also being driven by the need for more cost-effective sensing solutions. With the cost of miniaturization decreasing, more and more companies are looking to incorporate miniature sensors into their products to gain a competitive advantage.

The trend towards miniaturization is expected to continue in the coming years, which will likely lead to further growth in the demand for miniature sensors including Interface’s miniature torque transducers.

Additional Resources

Anniversary of Interface Miniature Torque Transducers

Choosing the Right Torque Transducer

Flange Style Load Cells and Torque Transducers 101

Insights in Torque Testing Featured in Quality Magazine

 

 

Anniversary of Interface Miniature Torque Transducers

Interface received two patents for ‘Load Cell For Monitoring Torsion and Having Overload Protection’ for intellectual property used in the invention and manufacturing of Interface’s miniature rotary torque transducers.

Patent US 8,161,828 B1 was assigned to Interface based on submissions from Interface engineers and force measurement experts LaVar Clegg and Lawrence Burrow. The filing is based on IP used in the product designs for the Interface MRTP Miniature Overload protected flange style reaction torque transducer and the MRT2P Miniature Overload Protected Flange Style Reaction Torque Transducer. The second patent, US 8,904,883 B2, was awarded to years later for the same products.

Interface offers more than 50 different types of reaction and rotary torque transducers models with varying capacities, design features and dimensions. Our transducers are precision-machined and use our proprietary strain gages for accuracy in measurement. Interface’s miniature torque transducers are popular for their size, easy installation, durability, quality, and accuracy.

MRT2 and MRT2P Patents

Interface’s patented MRT2 Miniature Reaction Torque Transducer flange-type design is available in 44.3 lbf-in to 443 lbf-in (5 Nm to 50 Nm) capacities. It is small in size, 2.75 x 2.25 inches, which offers easy installation. With a low capacity, compact design it provides excellent linearity and repeatability. This Interface product uses our proprietary temperature compensated strain gages. It offers low deflection and high torsional stiffness, which makes it a suitable selection for reciprocating measurements. We currently offer three standard models 10 Nm Capacity, 20 Nm and 50 Nm). Modified and custom options are available.

The Interface MRT2P Overload Protected Flange Style Reaction Torque Transducer features 3X safe overload in 1.77 to 17.7 lbf-in (0.2 Nm and 2 Nm) capacities. The patented flange design and dimensions make it easy to mount. The U.S. made product uses proprietary Interface temperature compensated strain gages. The MRT2P has low deflection and high torsional stiffness. The MRT2P is also preferred for reciprocating measurements.

Interface has offered our MRT miniature reaction torque transducers for more than 20 years. Additional Interface miniature torque transducer models available include:

Robotic Surgical Arm Application Using Miniature Reaction Torque Transducers

The compact design of the MRT series makes this an ideal product for embedding into components or products. As defined in the application note, Robotic Surgery Force Feedback, Interface’s MRTP Miniature Overload Protected Flange Style Reaction Torque Transducer, along with our ConvexBT Load Button Load Cell and SMTM Micro S-Type Load Cell are utilized for measuring forces in a surgical robotic arm. The force measurement output is transmitted to the BX8 8-Channel Data Acquisition and Amplifier to provide real-time feedback during the design and testing of this advanced medical device. Read more about robotic surgery applications here.

Interface has a long history of awards and patents. Richard F. Caris, founder of Interface first filed for the patent in 1979, specifically for a weighing apparatus with overload protection for off-center loading. Caris received patents in 1981 and 1983 for these load cell inventions. Since these initial filings, Interface has received U.S. Patents for Axial Force Pressure Transducer, which is our proprietary AxialTQ product, and the Load Washer (Crockett). We have also received notification of allowance for the 2020 filing for a Wireless Load Cell Monitoring.

ADDITIONAL TORQUE RESOURCES

Flange Style Load Cells and Torque Transducers

Interface Sensors Used for Development and Testing of Surgical Robotics

Making Products Smarter with Interface OEM Solutions

Torque Measurement Primer

Choosing the Right Torque Transducer

 

 

 

Flange Style Load Cells and Torque Transducers 101

Interface offers several flange type load cells and torque transducers for easy mounting and installation. Interface provides the complete solutions for a flange mount including the adapters, bases, bolts, connector options and cables.

Standard flange designs mount directly to cylinders for stability and accuracy in measurement. We also offer mounting plates for more complex testing systems that use one or more sensors.

The primary advantage of the Interface Flange Load Cell is that the hub of the transducer is mounted using several smaller screws instead of one large central thread. It is easier to preload multiple smaller screws (bolts) than a single central thread. In certain applications it may not be possible to properly preload a central thread due to the torque limits of the load cell. There’s also the important benefit of clocking a load cell fixtures alignment.

The most popular low profile flange mount load cell is the 12X8 Flange Load Cell. This load cell is similar in design to our Interface 1200 series.  Instead of a center hole, the 12X8 has multiple smaller holes making installation easier for certain types of cylinders. The 12X8 is for tension and compression measurement. It is fatigue rated with the ability to survive 100 million fully reversed cycles. The load cell has proprietary Interface temperature compensated strain gages and performance to 0.05%. It is eccentric load compensated with low deflection. The 12X8 is ideal for long-term cycle testing.

Watch How to Mount a Flange Style Load Cell

Interface offers a variety of flange style products including load cells, miniature load cells, torque transducers and multi-axis sensors. Here are a few of the flange offerings available from Interface:

12X8 Flange Standard Precision LowProfile® Load Cell

2300 High Capacity Flange Mount Column Load Cell

1700 Flange LowProfile® Load Cell

MRT Miniature Flange Style Reaction Torque Transducer

MRT2 Miniature Flange Style Reaction Torque Transducer

MRT2P Miniature Overload Protected Flange Style Reaction Torque Transducer

5400 Series Flange Style Reaction Torque Transducer

TS18 Shaft to Flange Style Reaction Torque Transducer

TS16 Male Square Drive to Flange Style Reaction Torque Transducer

TSCF C-Face Flange Torque Transducer

6ADF Series 6-Axis DIN Flange-Type Load Cells

Flange style load cells are commonly used in a wide range of applications, from automotive testing to agriculture equipment tests. The variety of flange style solutions are ideal for specialized product designs, including robotics, medical devices, OEM products and equipment requiring secure mounting with sensor capabilities.

TRACTOR POWER TAKE OFF SYSTEM TESTING

In this example you can see how a tractor manufacturer needed to measure the torque and speed of the tractor’s PTO (power takeoff test) system. The purpose of the applied sensor solution was to ensure the PTO was working properly when an implement is attached to the tractor. It also provides ongoing maintenance monitoring for optimum performance. Interface provided a T27 Bearingless Hollow Flange Style Rotary Torque Transducer to measure the tractor’s torque and speed of their tractor’s PTO system.

ROBOTIC SURVEY FORCE FEEDBACK SYSTEM

Robotic Surgery Force Feedback App Note

Additional flange style models can be found in our extensive product catalog, which defines the specifications, capacities and design features.