Torque is an important factor in much of the equipment on a factory floor. Measuring torque is often something that's misunderstood, which can lead to over- under-designing of measurement systems. This article addresses the many techniques and tradeoff of torque measurement techniques.

Torque can be divided into two major categories, either static or dynamic. The methods used to measure torque can be further divided into two more categories, either reaction or in-line. Understanding the type of torque to be measured, as well as the different types of torque sensors that are available, will have a profound impact on the accuracy of the resulting data, as well as the cost of the measurement.

In a discussion of static vs. dynamic torque, it is often easiest start with an understanding of the difference between a static and dynamic force. To put it simply, a dynamic force involves acceleration, were a static force does not.

The relationship between dynamic force and acceleration is described by Newton’s second law; F=ma (force equals mass times acceleration). The force required to stop your car with its substantial mass would a dynamic force, as the car must be decelerated. The force exerted by the brake caliper in order to stop that car would be a static force because there is no acceleration of the brake pads involved.

https://www.eetimes.com/document.asp?doc_id=1273988

Dear Ali, usually in technical literature about rotating devices "static" is the torque to apply for breaking down a rotating shaft, while "dynamic" is the torque for rotating it (e.g. the torque by a motor on its shaft during rotation). Gianluca

Torque is an important factor in much of the equipment on a factory floor. Measuring torque is often something that's misunderstood, which can lead to over- under-designing of measurement systems. This article addresses the many techniques and tradeoff of torque measurement techniques.

Torque can be divided into two major categories, either static or dynamic. The methods used to measure torque can be further divided into two more categories, either reaction or in-line. Understanding the type of torque to be measured, as well as the different types of torque sensors that are available, will have a profound impact on the accuracy of the resulting data, as well as the cost of the measurement.

In a discussion of static vs. dynamic torque, it is often easiest start with an understanding of the difference between a static and dynamic force. To put it simply, a dynamic force involves acceleration, were a static force does not.

The relationship between dynamic force and acceleration is described by Newton’s second law; F=ma (force equals mass times acceleration). The force required to stop your car with its substantial mass would a dynamic force, as the car must be decelerated. The force exerted by the brake caliper in order to stop that car would be a static force because there is no acceleration of the brake pads involved.

https://www.eetimes.com/document.asp?doc_id=1273988

A basic definition stems from the meaning of static and dynamic. Static means constant with time and dynamics means varying with time. The steady state is the state of the system at the end of the dynamics when the response time tends to infinity.

So static torque means torque which is fixed with time and dynamic torques is a torque which varies with time such as unit step torque, rectangular pulse torques, alternating torque, ... etc.

Best wishes