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Reaction Torque Sensor vs. Rotary Torque Sensor: Unveiling the Differences


In the world of torque measurement, two important actors stand out: response torque sensors and rotational torque sensors. These sensors are essential in many sectors because they provide precise and dependable measurements of rotating forces. This article will examine the differences between Reaction Torque Sensor vs. Rotary Torque Sensor, examine their uses, and assist you in determining which sensor could be the most appropriate for your particular requirements.

An explanation of reaction torque sensors

Reaction torque sensors, also known as torque transducers, are devices that measure the twisting or turning force imparted to an object. Utilizing strain gauge technology, these sensors work.

By detecting variations in electrical resistance within strain gauges as torque is applied, they offer accurate and instantaneous measurements of rotating forces. Reaction torque sensors are widely utilized in industries such as automotive, aerospace, robotics, and research, allowing engineers and researchers to assess torque in a variety of applications.

Rotary Torque Sensors: An Overview

Rotary torque sensors, like reaction torque sensors, are useful for monitoring rotational forces. These sensors are made to be embedded into the powertrain or shaft and detect the torque being transmitted directly. Rotary torque sensors use a variety of methods, such as optical, magnetoelastic, and surface acoustic wave (SAW) technologies, to precisely measure torque. They have uses in industries like automotive, industry, and research, where accurate torque measurement is essential for performance assessment and quality control.

Key Differences Between Reaction Torque Sensor vs. Rotary Torque Sensor

Installation Method

Reaction torque sensors and rotational torque sensors differ significantly in how they are installed. Reaction torque sensors are installed outside and respond to the applied torque to an item. In contrast, rotational torque sensors are built into the drivetrain or shaft and immediately measure the torque being delivered. This distinction affects how easily they can be installed and how well they work with various systems.

Contact vs. Non-Contact Measurement

Reaction torque sensors rely on physical contact with the object being measured. Usually, strain gauges are used to measure changes in electrical resistance, which necessitates direct physical contact with the rotating element. Rotating torque sensors, on the other hand, can make use of non-contact measurement techniques like optical or magnetoelastic principles. Because of its non-contact nature, it can rotate at higher speeds and with less disturbance.

Sensing Range and Accuracy

The detection range and accuracy of the two types of sensors are additional differentiators. In order to accommodate a variety of applications that call for both low and high torque levels, reaction torque sensors frequently offer a larger range of torque measurements. Rotary torque sensors excel at providing great precision and resolution within their designated range despite having shorter sensing ranges.

Physical Dimensions and Design

Reaction torque sensors are often larger and more externally located in terms of size and design. Depending on the application and needed torque range, their size may change. Rotating torque sensors, on the other hand, are typically more compact and made to be integrated into the powertrain or shaft. Their lower size enables seamless integration without materially altering the design of the entire system.

Applications of Reaction Torque Sensor vs. Rotary Torque Sensor

Reaction Torque Sensor Applications

Engine analysis and testing in the automobile sector

The development and performance assessment of the chassis

Aerospace and defense testing for essential components and systems

Robotics and industrial automation for force feedback and accurate control

equipment for healthcare and rehabilitation, which helps with the creation of orthotics and prostheses.

Research and development environments for scientific experiments and material testing

Automotive testing and quality control for engines, transmissions, and drivetrains

Rotary Torque Sensor Applications

industrial uses, like torque monitoring in production procedures.

Innovation, especially in robots and precision machinery

Power production and renewable energy technologies

Performance evaluations of motors, pumps, and other rotating machinery

Choosing the Right Torque Sensor for Your Needs

To choose the right torque sensor for your application, you should consider the following factors:

Torque Range: Establish the range of torque necessary for your application. Determine the necessary level of accuracy and resolution.

Installation Approach: Determine whether an externally mounted or an incorporated sensor is best for your system.

Environmental Conditions: Take into account the humidity, temperature, and any potential vibrations in your working area.

Signal Output and Compatibility: Verify the signal output format and its suitability for your data-gathering equipment.

You can choose the torque sensor that best suits your requirements by carefully weighing these criteria.

FAQs Reaction Torque Sensor vs. Rotary Torque Sensor (Frequently Asked Questions)

Can reaction torque sensors be used in high-speed applications?

A1: Reaction torque sensors are commonly used in high-speed applications. However, it is essential to pick a sensor that is specially made to manage the rotating speeds present in your application.

Are rotary torque sensors suitable for both static and dynamic torque measurement?

A2: The use of rotational torque sensors for both static and dynamic torque measurements is possible. They deliver precise readings under steady-state settings and have the ability to record dynamic torque changes in real time.

Can a response torque sensor be retrofitted into an existing system?

Reaction torque sensors can frequently be retrofitted into already-existing systems, which is true. However, it is crucial to guarantee compatibility with the mechanical and electrical connections of the system. Consultation with the sensor manufacturer or a certified expert is advised.

Which torque sensor is better suited for applications where space is at a premium?

Rotary torque sensors usually perform better in tight spaces due to their small size and integrated design. They can be smoothly incorporated into the shaft or drivetrain, reducing the effect on the size of the entire system.

Are reaction torque and rotary torque sensors interchangeable?

Rotor torque sensors and reaction torque sensors require different installation methods and design considerations. Although they both measure torque, they cannot be used interchangeably without the necessary system changes.


You may choose wisely regarding torque measurement in your industry by understanding the differences between reaction torque sensors and rotary torque sensors. Whether you need external measurement or integration within the drivetrain, these sensors help with reliable torque analysis and performance evaluation. Take advantage of torque sensors’ strength to discover new ways to measure and comprehend rotating forces.

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