Shenzhen Alu Rapid Prototype Precision Co., Ltd.

1.Strain Gauge-Based Sensors:

Principle: Measure deformation (strain) in a material caused by torque using strain gauges bonded to a flexing structure. Changes in electrical resistance are converted to torque values.

Advantages: High accuracy, widely used, cost-effective for industrial applications.

Applications: Robotic arms for assembly, machining, or force-controlled tasks.

Example: Wheatstone bridge circuits amplify small resistance changes for precise readings.

2.Piezoelectric Sensors:

Principle: Generate electric charge when mechanical stress (torque) is applied to piezoelectric materials like quartz.

Advantages: High sensitivity, fast response, suitable for dynamic torque measurement.

Applications: High-speed robotic tasks, such as drilling or vibration monitoring.

Limitations: Less effective for static torque due to charge leakage.

3.Capacitive Torque Sensors:

Principle: Detect changes in capacitance between rotating and fixed plates caused by torque-induced displacement.

Advantages: Non-contact, high resolution, low wear.

Applications: Precision robotics, like surgical robots or delicate assembly.

Limitations: Sensitive to environmental factors like temperature or humidity.

4.Magnetoelastic Sensors:

Principle: Use magnetic field changes in a material under torque stress to measure force.

Advantages: Non-contact, robust, suitable for harsh environments.

Applications: Heavy-duty robots in automotive or aerospace industries.

Example: Sensors embedded in robot joints for real-time torque monitoring.

5.Optical Torque Sensors:

Principle: Measure torque by detecting light modulation (e.g., phase shift or intensity change) caused by shaft twist, often using optical encoders or fiber optics.

Advantages: Immune to electromagnetic interference, high precision.

Applications: High-precision tasks in cleanroom environments or medical robotics.

Limitations: Complex and costly setup.

6.Surface Acoustic Wave (SAW) Sensors:

Principle: Use acoustic waves on a material’s surface, altered by torque-induced strain, to measure force.

Advantages: Wireless, compact, high sensitivity.

Applications: Emerging in compact or wireless robotic systems.

Limitations: Still developing for widespread use.