The Difference Between Dynamic Torque Sensor and Static Torque Sensor

A torque sensor is a device that measures torque and can provide accurate torque measurement results in various applications. Depending on different application scenarios, torque sensors can be divided into dynamic torque sensors and static torque sensors. This article will provide a detailed introduction to the differences between these two types of torque sensors.

Working Principle

1. Dynamic Torque Sensor: A dynamic torque sensor is primarily used to measure dynamic torque, such as in rotating machinery, electric motors, and turbines. Its working principle involves the use of the principle of electromagnetic induction to calculate torque by measuring the electromagnetic induction electromotive force. When torque is applied to the sensor, the magnetic resistance in the magnetic circuit changes, thereby altering the amplitude and phase of the induced electromotive force. By measuring and processing the induced electromotive force, the magnitude and direction of the torque can be calculated.

2. Static Torque Sensor: A static torque sensor is mainly used to measure static torque, such as in bridges, buildings, and heavy machinery. Its working principle involves the use of the resistance strain principle to calculate torque by measuring the deformation of strain gauges. When torque is applied to the sensor, the strain gauge deforms, thereby changing its resistance value. By measuring and processing the resistance value, the magnitude and direction of the torque can be calculated.

Measurement Accuracy

1. Dynamic Torque Sensor: The measurement accuracy of a dynamic torque sensor is relatively high, reaching ±0.1% FS (full scale). This is because the dynamic torque sensor adopts advanced signal processing technology and high-precision measurement circuits, which can effectively eliminate various interference factors and improve measurement accuracy.

2. Static Torque Sensor: The measurement accuracy of a static torque sensor is relatively lower, generally around ±1% FS (full scale). This is because static torque sensors are affected by various factors such as temperature, humidity, and vibration, which can easily lead to measurement errors. To improve the measurement accuracy of static torque sensors, a series of compensations need to be taken, such as temperature compensation and vibration compensation.

Response Speed

1. Dynamic Torque Sensor: A dynamic torque sensor has a fast response speed, reaching the level of milliseconds. This is because the dynamic torque sensor uses advanced signal processing technology and high-speed sampling technology, which can quickly respond to changes in torque. This fast response speed makes dynamic torque sensors have a wide range of application prospects in real-time monitoring, control, and other scenarios.

2. Static Torque Sensor: A static torque sensor has a slower response speed, usually around seconds. This is because static torque sensors are affected by various factors such as temperature, humidity, and vibration, and require a certain amount of time to stabilize the measurement results. This slow response speed limits the application of static torque sensors in real-time monitoring, control, and other scenarios.

Scope of Application

1. Dynamic Torque Sensors: Dynamic torque sensors are suitable for situations where dynamic torque needs to be measured, such as in rotating machinery, electric motors, and turbines. Due to their fast response speed and high measurement accuracy, they can be used for real-time measurement and control of the operating status of mechanical equipment. In addition, dynamic torque sensors can also be used to study the dynamic characteristics of mechanical equipment and optimize control algorithms.