Low Voltage Rotary Actuators STS Series

CORNER TYPE Collaborative Robot Joint Module
Low-voltage rotary actuators are categorized into two distinct models, the I series and the T series, each equipped with dual encoders, a drive mechanism, and a braking system. These low-voltage variants boast a refined design and a compact form factor. Within their compact dimensions, they integrate key components including a servo drive, an absolute encoder at the motor end, another at the output end, a frameless torque motor, a brake, and a precision harmonic reduction gear. This integrated approach saves customers the effort and time associated with selecting, designing, procuring, and assembling a multitude of mechanical and electronic components.
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PRODUCT ADVANTAGES

  1. Compact design with high torque output.
  2. Precision manufacturing ensures absolute positioning accuracy within 20 arc seconds.
  3. Features a large hollow shaft for ease of cable, pipe, and laser equipment installation.
  4. Built to withstand various conditions with an IP65 rating for environmental protection.
  5. Designed for longevity with no need for maintenance or grease replacement throughout its service life.
  6. Durability is assured, maintaining consistent accuracy even after extended use exceeding 15,000 hours.

PRODUCT DESCRIPTION

The STS Series features a low-voltage T-joint design, equipped with dual encoders, a combined drive unit, and a retention brake.

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Embedded Servo Drive Communication Interfaces Incorporating.

communication protocols such as EtherCAT, CANopen, and Modbus.

Real-time tunability for PID parameters related to position, speed, and current loop. Includes a built-in ±10V analog input interface. Supports pulse and direction control, I/O interfacing, and RS485 communication.

Compatibility with external encoders and an STO (Safety Torque Off) interface, All within the compact dimensions of DxL=70x67mm.

Integrated Dual Absolute Encoders.

Dual-Loop Positioning Control System Utilizes a 16-bit absolute multi-turn encoder for the output shaft.

Ensures repeatability within a precision range of ±7 arc seconds.

Achieves absolute accuracy within a margin of ±15 arc seconds.

Maintains the real-time absolute position and multi-turn count even during power-off.

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Internal Friction Brake

Mechanism Provides a smooth and reliable braking action.

Eliminates any gaps or play in the system.

Ensures consistent performance without the need for recalibration upon power-up.

Features a wear-free design. Suitable for use as an emergency stop mechanism.

SPECIFICATIONS

Specification of Low Voltage Rotary Actuators STS Series

Model 14 17 20 25 32 40
Harmonic Drive-reduction ratio 51 81 101 51 81 101 121 51 81 101 121 51 81 101 121 51 81 101 121 51 81 101 121
Permissible Peak Torque at Start and Stop N·m 23 30 36 44 56 70 70 73 96 107 113 127 178 204 217 281 395 433 459 523 675 738 802
Permissible Maximum Value for Average Load Torque N·m 9 14 14 34 35 51 51 44 61 64 64 72 113 140 140 140 217 281 281 255 369 484 586
Permissible Maximum Momentary Torque N·m 46 61 70 91 113 143 112 127 165 191 191 242 332 369 395 497 738 841 892 892 1270 1400 1530
Maximum Rotate Speed rpm 107.8 67.9 54.5 98.0 61.7 49.5 41.3 78.4 49.4 39.6 33.1 78.4 49.4 39.6 33.1 58.8 37.0 29.7 24.8 49.0 30.9 24.8 20.7
Rated Rotate Speed rpm 58.8 37.0 29.7 58.8 37.0 29.7 24.8 58.8 37.0 29.7 24.8 58.8 37.0 29.7 24.8 39.2 24.7 19.8 16.5 39.2 24.7 19.8 16.5
Maximum Current Arms 8.25 6.77 6.52 13.48 10.80 10.83 9.04 21.52 17.82 15.93 14.04 29.65 26.16 24.05 21.35 48.21 42.67 37.51 33.19 84.01 68.27 59.86 54.30
Rated Current Arms 3.23 3.16 2.53 10.42 6.75 7.89 6.59 12.97 11.32 9.53 7.95 16.81 16.61 16.50 13.77 24.02 23.44 24.34 20.32 40.96 37.32 39.26 39.67
Torque Constant Nm/Arms 2.79 4.43 5.52 3.26 5.18 6.46 7.74 3.39 5.39 6.72 8.05 4.28 6.80 8.48 10.16 5.83 9.26 11.54 13.83 6.23 9.89 12.33 14.77
Motor Phase resistance Ohms 0.358 0.358 0.358 0.103 0.103 0.103 0.103 0.1 0.1 0.1 0.1 0.05 0.05 0.05 0.05 0.032 0.032 0.032 0.032 0.012 0.012 0.012 0.012
Motor Phase Inductance mH 0.334 0.334 0.334 0.288 0.288 0.288 0.288 0.296 0.296 0.296 0.296 0.365 0.365 0.365 0.365 0.17 0.17 0.17 0.17 0.063 0.055 0.055 0.055
Back-EMF Vrms/krpm 5.47 5.47 5.47 6.08 6.08 6.08 6.08 7.02 7.02 7.02 7.02 7.78 7.78 7.78 7.78 10.07 10.07 10.07 10.07 12 12 12 12
Pole number 8 8 8 5 5 5 5 7 7 7 7 5 5 5 5 8 8 8 8 10 10 10 10
Supply Voltage V DC 48V
Motor Insulation Thermal Class ： F(155 ℃ )
Insulaing Resistance ： Above 500MΩ （ DC500V ）
Withstanding Voltage and Insulation ： AC1500V(1minute)
Size mm 74*100*86.5 85*113*97 115*143*131 150*169*170
Absolutely Encoder Encoder Type Dual Absolute
Encoder Resolution Single 17bit/Muilt 16bit
One way Positioning Accuracy Arc sec 60
Repeated Positioning Accuracy Arc sec 20
Overturning Stiffness ×10^4 Nm/rad
Torsional Stiffness ×10^4 Nm/rad
Moment of Inertia kg*mm^2 61.2 71.2 226.5 893.6
Weight kg 1.4 2.2 4.7 8.0
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