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Shenzhen Seninter Precision Machinery Co.,Ltd.

  • China,Shenzhen ,Guangdong
  • Verified Supplier
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China Humanoid Lower Leg Joint Linear Actuator-3900N
China Humanoid Lower Leg Joint Linear Actuator-3900N

  1. China Humanoid Lower Leg Joint Linear Actuator-3900N
  2. China Humanoid Lower Leg Joint Linear Actuator-3900N

Humanoid Lower Leg Joint Linear Actuator-3900N

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Communication Protocol CAN FD / EtherCAT
Maximum Linear Speed 300mm/s
Stroke 80mm
Rated Voltage DC48V ±10%
Maximum Thrust Force 3900N
Overall Dimension 53mm*212mm
Certification CE ROHS
Model Number F3900
Brand Name SENINTER
Place of Origin CHINA

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  1. Product Details
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Product Specification

Communication Protocol CAN FD / EtherCAT Maximum Linear Speed 300mm/s
Stroke 80mm Rated Voltage DC48V ±10%
Maximum Thrust Force 3900N Overall Dimension 53mm*212mm
Certification CE ROHS Model Number F3900
Brand Name SENINTER Place of Origin CHINA


This linear actuator is designed for linear joints on humanoid robot limbs. It integrates drive system, transmission structure, force sensing and position feedback as a single unit, equipped with large-lead planetary roller screw, four-point contact bearing, high-performance frameless torque motor, high-precision inductive encoder and high-precision tension force sensor.

  • High Thrust Density

    It provides a maximum thrust of up to 8 kN with compact and lightweight dimensions, meeting the weight reduction demands of humanoid robots.

  • Dual Full Closed-Loop Sensing

    Position and force dual closed-loop control enables precise flexible motion, landing buffering and external force detection.

  • Highly Integrated Monolithic Structure

    The motor, screw, sensors and bearings are entirely encapsulated inside the cylinder, simplifying wiring layout and improving overall assembly efficiency.

  • Superior Dynamic Response

    The combination of frameless torque motor and large-lead screw delivers fast extension and retraction, suited for high-dynamic gaits including walking, running and jumping.

  • Shock Resistance & Durability

    The planetary roller screw paired with heavy-load bearings withstands impact loads from robotic gaits, extending the service life of the whole actuator.




Micro actuators are deployed for joint driving of dexterous robotic fingers.
This high-thrust linear actuator is customized as the drive unit for humanoid robot shank linear joints, supporting stable walking and standing posture control.

The servo electric cylinder is a modular unit with integrated servo motor and lead screw assembly. It transforms the rotary output of the servo motor into precise linear displacement, representing a groundbreaking new generation solution for high-accuracy linear motion systems.


No. Specifications Data
1 Size 53mm*212mm
2 Max. Force 3900N
3 Max. Speed 300mm/s
4 Stroke 80mm
5 Weight 1.2kg
6 Integrated Brake Without
7 Network Communication CAN FD/EtherCAT
8 Rated Voltage DC48±10%
9 Pressure Sensor Yes
10 Internally Integrated Drive Controller Yes


Company Details

Bronze Gleitlager

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  • Business Type:

    Manufacturer

  • Year Established:

    2017

  • Total Annual:

    10 million USD-15million USD

  • Employee Number:

    100~300

  • Ecer Certification:

    Verified Supplier

Shenzhen Seninter Precision Machinery Co., Ltd. integrates R&D, production, sales and after-sales services. We specialize in the R&D and manufacturing of AC motors, DC motors, servo motors, brushless motors, gearboxes, geared motors and harmonic reducers, as well as supporting components for... Shenzhen Seninter Precision Machinery Co., Ltd. integrates R&D, production, sales and after-sales services. We specialize in the R&D and manufacturing of AC motors, DC motors, servo motors, brushless motors, gearboxes, geared motors and harmonic reducers, as well as supporting components for...

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  • Shenzhen Seninter Precision Machinery Co.,Ltd.
  • Shenzhen, Guangdong, P.R.China
  • https://www.seninter.com/

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