Product Specification

Technical Parameters

• Large Hollow Permanent Magnet Brake

  Dedicated for Humanoid Robot Joint Safety Holding & Precision Parking

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  Why Do Humanoid Robots Need a Dedicated Permanent Magnet Brake?

  In the event of power loss, emergency stop, or standby mode, every joint of a humanoid robot must reliably lock in position to prevent gravity-induced droop (e.g., arm sagging, waist twisting). At the same time, the brake must release instantly with zero delay upon power‑on to ensure smooth, uninterrupted motion.

  Traditional electromagnetic spring‑applied brakes suffer from three critical drawbacks:

  • Brake backlash → causes positional drift and degrades repeatable positioning accuracy

  • Acoustic noise → impairs the quiet operation expected in service robots

  • Solid‑shaft design → consumes valuable routing space and increases joint length

  Our Large Hollow Permanent Magnet Brake has been specially developed for the compact architecture of biomimetic joints. It employs permanent‑magnet holding technology for fail‑safe power‑off locking and a large through‑hole design to free up internal space, making it the perfect match for both linear and rotary actuators in humanoid robots.

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  Key Product Advantages

  1. Broad Torque Coverage – One Solution from Fingers to Hips/Knees

  • Torque range: 0.25 ～ 40 N·m

  • Low‑torque models (0.25–2 N·m) → dexterous fingers, wrist pitch

  • Medium‑torque models (5–15 N·m) → elbow joints, waist rotation

  • High‑torque models (30–40 N·m) → hip and knee load‑bearing joints, reliably withstanding full‑body gravitational moments

  Electrical ratings: Rated voltage 24 V DC, maximum speed 6,000 rpm – meeting the dynamic response demands of high‑speed joints.

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  2. Zero Noise, Zero Backlash – “Silent Precision Holding”

  • Braking action produces no mechanical impact noise (< 40 dB), ideal for household and commercial service environments.

  • Zero‑backlash locking eliminates micro‑deflections caused by gear hysteresis, ensuring that repeatable positioning accuracy is transmitted without loss.

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  3. Large Hollow Structure – Cables Pass Straight Through

  • Unlike conventional solid‑shaft brakes, our large central through‑hole allows power cables, encoder wiring, and even hydraulic tubes to be routed directly through the brake.

  • No need for external cable loops – saves approximately 15–20% of joint axial length, greatly simplifying internal wiring in arms and legs.

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  4. Dual‑Mounting Design – Flexible Integration with Different Actuator Architectures

  • Flange mounting with screws – suitable for standard harmonic drive output flanges

  • Interference press‑fit – ideal for ultra‑compact frameless motor embedded designs

  Both mounting methods ensure concentricity between stator and rotor, preventing uneven wear and torque degradation over time.

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  Application Scenarios – Precise Matching

  
  

  
  

  Joint Application	Recommended Torque	Core Benefit
  Dexterous finger joints	0.25 – 1 N·m	Ultra‑lightweight; maintains grip force after power‑off to prevent workpiece slippage
  Wrist / elbow joints	2 – 10 N·m	Zero‑backlash ensures precise termination for insertion, assembly, and delicate operations
  Waist rotation / shoulder joints	15 – 25 N·m	Large hollow passes thick power cables smoothly through the torso
  Hip / knee load‑bearing joints	30 – 40 N·m	Robustly withstands whole‑body impact; secure holding during squatting and standing without creep

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  Comprehensive Benefits Over Traditional Brakes

  • Space liberation: Hollow‑shaft routing reduces joint housing diameter, enabling more anthropomorphic outer designs.

  • Energy efficiency: Permanent‑magnet holding requires only a brief pulse for release; no holding current is consumed during standby – up to 90% lower standby power consumption compared to conventional spring‑applied brakes.

  • Silent operation: No abrupt acoustic noise, significantly improving human‑robot interaction comfort in home and commercial settings.

  • Simplified assembly: Dual mounting options plus through‑hole cabling shorten overall assembly time and reduce process complexity.

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  Customization Services – Tailored to Your Joint Architecture

  We understand that every humanoid robot has unique structural requirements. We offer flexible customization options:

  • Torque value – adjustable within the 0.25–40 N·m range

  • Through‑hole diameter – customized to fit your cable/harness outer diameter

  • Mounting interface – tailored to your flange dimensions or press‑fit tolerances

  • Overall dimensions – axial/radial fine‑tuning for space‑constrained designs

  From selection to mass production, we provide full technical support to accelerate your product development cycle.

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  For detailed 2D/3D drawings, sample testing, or technical consultation, please contact us at any time.