What are the Different Types of Torque Sensors?
1. Dynamic and static torque sensors:
Dynamic torque transducers: measure torque changes during rotation. It is often used for real-time monitoring (such as engine output torque). Need to have a high frequency response, anti-interference ability.
Static torque transducers: Measure torque at rest or under slow rotation. It is used for calibration or laboratory testing.
2. Non-contact vs. contact:
Non-contact (advantage): long life, high reliability, anti-interference, easy installation.
Typical examples are magneto-electric and fiber-optic.
Contact type (traditional): relies on conductive slip rings or strain gauges, easy to wear. But the technology is mature, low-cost.
3. Subdivision type:
Torsion Angle Phase Difference Type:
Calculates torque by measuring the phase difference through two sets of gear sensors.
Strain Gauge Sensor:
Detects elastic shaft deformation using resistive strain gauges.
Magnetostrictive Sensor:
Utilizes the stretching property of a material under a magnetic field.
Fiber optic type:
Measurement of torque by phase change of optical signal. Wireless acoustic surface wave type: Utilizing acoustic wave propagation characteristics.
What is the Dynamic Torque?
Dynamic torque is also called stall torque. It refers to the maximum torque that can be applied during the rotation or operation of the servo. Dynamic torque is used to overcome the inertia and friction of the load to enable the mechanical system to move.
Dynamic torque is closely related to voltage. High voltage can increase the output power of the DC motor, thereby increasing the dynamic torque.
Application scenario:
Dynamic torque is suitable for frequent starting, stopping or changing direction. For example, the robot joint needs to overcome the initial static friction to start during movement.
