BXI hollow-shaft planetary joint motors lineup

Advanced Motor Designed for Embodied

Hollow Shaft
Planetary Motors

Built for Embodied Intelligence

BXI 85/70/50 Series Motors

A three-size actuator lineup with high torque density, hollow-shaft routing, planetary reduction, and dual absolute encoders.

BXI 85 series motor front view
BXI motor lineup with integrated harness
BXI motor lineup multi-angle view
BXI 50 series motor side view

Motor Technical Specifications

Detailed parameters across the joint motor lineup (theoretical values; actual values vary by operating conditions).

ParameterBXI8515-19BXI7010-19BXI5018-19BXI5014-19
Rated torque40 N·m15 N·m11 N·m7 N·m
Peak torque150 N·m50 N·m35 N·m25 N·m
Rated voltage24–48 V24–48 V24–48 V24–48 V
No-load speed200 rpm200 rpm200 rpm200 rpm
Rated output speed100 rpm100 rpm100 rpm100 rpm
Peak phase current90 A60 A30 A30 A
Reduction ratio19.519.519.519.5
Weight1.4 kg0.8 kg0.55 kg0.5 kg
Installation diameter99 mm81 mm64 mm64 mm
Height73 mm68 mm70.5 mm66.5 mm
Hollow bore10 mm9 mm6 mm6 mm
EncodersDual absolute (magnetic input + inductive output)Dual absolute (magnetic input + inductive output)Dual absolute (magnetic input + inductive output)Dual absolute (magnetic input + inductive output)
BearingCross-roller bearingCross-roller bearingCross-roller bearingCross-roller bearing
CommunicationCAN / CANFDCAN / CANFDCAN / CANFDCAN / CANFD
BXI 70 series motor side stack

Advanced Design

Hollow Shaft / High Torque Density / True Dual Encoder / Planetary Reduction

The hollow planetary design completely solves cable routing issues. Large-diameter outputs leave room for cables, hydraulics, and sensing bundles while maintaining excellent torque-to-weight ratios.

  • Hollow planetary design eliminates cable issues, greatly increases joint range of motion
  • True dual encoders with direct measurement on both input and output
  • Adjustable Torque Range from 30N·m to 150N·m
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BXI motors mounted on chassis side view

Embodied Stack

Built for Embodied Robots

Validated through extreme testing on multiple humanoid robot platforms.

  • Modular Design
  • Great for Arms
  • Great for Legs
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Frequently Asked Questions

What torque range do BXI joint motors provide?

The BXI 85/70/50 series joint motors deliver an adjustable torque range of 30–150 N·m, covering joints from arms to legs.

What makes these joint motors special?

They use a hollow-shaft planetary reduction design with true dual absolute encoders measured directly at both input and output, a high torque-to-weight ratio, and a large hollow output that frees routing space for cables and sensors.

Where are these motors used?

The motors are validated through extreme testing on multiple humanoid robot platforms, and their modular design suits both robotic arms and legs in high-DOF embodied systems.