Joint Torque Sensor_renewal

Everyone talks about accuracy.

But when a structure must repeat the same result thousands of times inside a joint,
it’s not accuracy that matters first — it’s structure.

At AL.Robot, we begin with how force travels
and how strain gauges experience stress.
FEM analysis, strain gauge placement, and automated validation.

We don’t rely on correction.
We focus on designing structures that eliminate errors from the start.

Key Features

AL.Robot’s joint torque sensors set a new standard in repeatability and structural stability.
Through optimized design and an automated calibration system, they adapt flexibly to various robotic architectures.

Structural design optimized for stress uniformity

Based on FEM analysis and modal testing,
the sensor is designed to ensure that the strain gauges experience uniform stress across all rotational angles.

The structure is optimized to prevent stress concentration in specific angular ranges,
providing consistent torque output throughout the full range of motion.

As a result, the sensor maintains stable linearity and accuracy across its entire rotational range.

Repeatability by Design, Not by Correction

Without manual adjustments, AL.Robot’s sensors use an automated calibration system to quantitatively verify hysteresis and repeatability errors.
Rather than correcting values after measurement, we structurally prevent errors from occurring in the first place.

Key features include

Achieves repeatability within ±0.2%
Maintains accuracy despite temperature fluctuations and long-term use
Automated calibration minimizes quality variation across units

Stable Sensitivity Regardless of Mounting Orientation

The sensor is designed to maintain consistent sensitivity and linearity, regardless of whether it is mounted via the outer or inner flange. This mechanical flexibility allows for stable operation even in various joint structures or under constrained installation conditions.

It fundamentally eliminates performance variation caused by mounting direction.

Slim Flange Design Optimized for Robotic Integration

The sensor's integrated flange structure optimizes the center of mass and reduces overall volume, minimizing mechanical interference in robotic designs.

This makes it highly suitable for the following applications

Lightweight arms of collaborative robots
Compact joint spaces in medical robots
Multi-axis precision control in humanoid robots

Balancing Productivity and Quality

With an automated calibration process and a built-in signal processing board,
the sensor maintains stable repeatability and quality even in mass production.
Design standards aimed at minimizing process variation are consistently applied across all products.

Key technical features include

Automated full-unit inspection criteria
Pre-calibration of critical characteristics such as cross-talk and hysteresis
A quality assurance system focused on repeatability

Specs	50Nm	100Nm	150Nm	200Nm	300Nm
Rated Load	50	100	150	200	300
Safety Overload	150%	150%	150%	150%	150%
Outer Diameter (mm)	70	85	95	105	120
Height (mm)	12	14	15	16	18
Weight (g)	180	250	310	370	450
Rated Output	1.5 mV/V	1.5 mV/V	1.5 mV/V	1.5 mV/V	1.5 mV/V
Nonlinearity	±0.2%	±0.2%	±0.2%	±0.2%	±0.2%
IP Rating	IP40	IP40	IP40	IP40	IP40