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Quality SYT-RI-70-90 factory
Quality SYT-RI-70-90 factory

SYT-RI-70-90

Basic Properties
Place of Origin: CHINA
Brand Name: SENINTER
Certification: CE ROHS
Model Number: SYT-RI-70-90 CAN
Product Summary
Humanoid Robot Joint Module (Rotary Actuator) Structure – Core Components Output Flange / Connector – Connects to robot links (e.g., lower leg, forearm), outputs torque and motion. Torque Sensor (optional but common in high-performance designs) – Ring or spoke type, used for force control / ...

Product Details

OD: 90mm
Length: 73mm
Max. Speed: 77RPM
Max. Torque: 108N·m
Voltage: 24-48VDC
Weight: 1.27kg
Protocol: EtherCAT / CAN
Product Description

Humanoid Robot Joint Module (Rotary Actuator) Structure – Core Components 

Output Flange / Connector – Connects to robot links (e.g., lower leg, forearm), outputs torque and motion.

Torque Sensor (optional but common in high-performance designs) – Ring or spoke type, used for force control / collision detection.

Harmonic Drive – Consists of a wave generator, flexspline, and circular spline; mounted on the motor output shaft.

Frameless Torque Motor – Stator fixed to the housing, rotor connected to the wave generator.

Brake (Safety Holding Brake) – Locks the joint position when power is lost.

Dual Encoders – Motor-side encoder (measures speed/position) and output-side encoder (eliminates reducer backlash error); commonly used for full closed-loop control.

Driver (Servo Drive Board) – Integrated inside the module or in a compact package.

Housing / Cooling Structure – Aluminum alloy body with cable channels.

 SYT-RI-70-90

Drawing without brake

SYT-RI-70-90







  without brake Parameter Table

Parameter Unit Ratio 51 Ratio 81 Ratio 101 Ratio 121
Gear Ratio - 51 81 101 121
Peak Torque N·m 69 91 102 108
Max Allowable Torque At Average Load (Robot Application) N·m 42 58 61 61
Rated Torque @ 2000RPM (Industrial Application) N·m 32 42 50 50
Peak Output Speed RPM 77 48 40 30
Rated Speed (With 1/2 Rated Torque) RPM 61 38 30 25
Gear Backlash arcsec 20 20 10 10
Rated Power W 500 500 500 500
Supply Voltage V 24–48 24–48 24–48 24–48
Max Continuous Current A 8.4 8.4 8.4 8.4
Rated Current A 6.1 6.1 6.1 6.1
Torque Constant N·m/A 0.118 0.118 0.118 0.118
Encoder Resolution bit 16 16 16 16
Communication Bus - CAN CAN CAN CAN
Hollow Shaft Diameter mm 18 18 18 18
Total Length mm 73.5±0.5 73.5±0.5 73.5±0.5 73.5±0.5
Mass kg 1.27 1.27 1.27 1.27
Rotational Inertia g·cm² 596.4 596.4 596.4 596.4

Drawing with brake



SYT-RI-70-90


With  brake Parameter Table


Parameter Unit Ratio 51 Ratio 81 Ratio 101 Ratio 121
Gear Ratio - 51 81 101 121
Peak Torque N·m 69 91 102 108
Max Allowable Torque At Average Load (Robot Application) N·m 42 58 61 61
Rated Torque @ 2000RPM (Industrial Application) N·m 32 42 50 50
Peak Output Speed RPM 77 48 40 30
Rated Speed (With 1/2 Rated Torque) RPM 61 38 30 25
Gear Backlash arcsec 20 20 10 10
Rated Power W 500 500 500 500
Supply Voltage V 24–48 24–48 24–48 24–48
Max Continuous Current A 8.4 8.4 8.4 8.4
Rated Current A 6.1 6.1 6.1 6.1
Torque Constant N·m/A 0.118 0.118 0.118 0.118
Encoder Resolution bit 16 16 16 16
Communication Bus - CAN CAN CAN CAN
Hollow Shaft Diameter mm 18 18 18 18
Total Length mm 92±0.5 92±0.5 92±0.5 92±0.5
Mass kg 1.5 1.5 1.5 1.5
Rotational Inertia g·cm² 746.7 746.7 746.7 746.7


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