Humanoid Robotics & Drive Technology
High-Performance Magnets for Compact Joint Drives
High-performance NdFeB magnets for lightweight, compact, and high-torque joint, hand, and linear drives.
Robotics Engineering
Maximum Performance for Mobile Robotic Systems
Humanoid robots require high torques, fast reactions, and sensitive control in very small installation spaces. In frameless torque motors and coreless DC motors, magnet quality, magnetization, and geometry therefore directly determine power density, weight, dynamics, and thermal stability.
For different joint sizes and load profiles, highly remanent N52 and N52H grades, as well as highly coercive UH and EH magnets, are primarily used. Spacemagnets Europe supports in selecting the appropriate material and develops customer-specific segments, radial rings, and pre-assembled magnet assemblies.
High Torque Density
Strong magnetic fields enable compact actuators with a high torque-to-weight ratio.
Low System Weight
Thin segments, miniature geometries, and integrated rotor solutions reduce moving mass.
Precise Movement
Homogeneous magnetization and defined field distribution support low cogging torque and smooth control.
Thermal Safety
H, UH, and EH grades offer increased coercive field strength for overloaded or closed joints.
Typical Magnetic Applications in Humanoid Robots
Frameless Torque Motors
Large hip, knee, shoulder, and torso joints benefit from compact design and high direct drive torque.
Coreless DC Motors
Lightweight, fast-reacting drives for fingers, grippers, and other fine motor functions.
Linear Drives and Spindle Motors
High force density for integrated actuators in closed or thermally demanding joints.
Resolvers and Position Sensors
Defined magnetic fields support accurate angle, speed, and position feedback.
Brakes and Holding Systems
Compact permanent magnet solutions secure axes and reduce energy consumption in holding state.
Haptics and Voice Coil Actuators
Dynamic magnetic circuits enable finely dosed forces, fast reaction, and natural interaction.
Typical NdFeB Grades for Humanoid Robots
The selection depends on torque requirements, installation space, cooling, and maximum opposing field. The following areas serve as technical guidance for design.
Magnet quality |
Temperature orientation |
Typical Application |
|---|---|---|
N52 / N52H |
up to approx. 80°C / 120°C |
Extremely compact coreless DC motors, finger and hand drives, and actively cooled joints |
N50UH / N48UH |
up to approx. 180°C |
Frameless torque motors in the hip, thigh, shoulder, and torso with high overload dynamics |
N45EH / N48EH |
up to approx. 200°C |
Closed high-load joints, spindle motors, and actuators with unfavorable heat dissipation |
The specified temperatures are not blanket approval values. The permissible operating temperature additionally depends on magnet geometry, opposing field, operating point, coating, cooling, and safety reserve, and must be verified in the specific magnetic circuit.
Magnet Shapes and Manufacturing Concepts
Radial Rings and Multi-Pole Magnetization
Radially oriented rings can support a uniform, sine-like field distribution and reduce assembly gaps – advantageous for low vibration and noise development.
Thin Segments and Special Geometries
Arc, slot, and miniature magnets efficiently utilize the limited installation space in fingers, wrists, and integrated actuators.
Segmentation and Skewed Pole Concepts
Adapted division and magnetization angles reduce torque ripple, eddy current losses, and local heating.
GBD and HRE-Reduced Materials
Grain boundary diffusion and optimized alloy concepts enable high coercive field strength with more efficient use of heavy rare earths.
Engineering Focus Areas for Robot Magnets
Magnetic Precision
Tight tolerances for flux, angular error, and pole pitch support sensitive control and low noise.
Demagnetization Safety
The operating point is secured against short-term overload currents, opposing fields, and elevated winding temperatures.
Miniaturization
Thin wall thicknesses, small radii, and complex contours require stable machining and testing processes.
Low Electrical Losses
Segmented or laminated magnets reduce eddy currents in fast-switched, highly dynamic drives.
Mechanical Integration
Bonding, potting, and holding concepts secure magnets against shock, vibration, and repeated acceleration.
Series Consistency
Documented material, dimensional, coating, and magnetic tests ensure reproducible joint performance.
Core Applications
Jointly Optimize Robot Joint and Magnetic Circuit
Send us torque, speed, temperature profile, installation space, number of poles, magnetization, and quantity. Our engineering team supports with material, geometry, simulation, and ready-to-install magnet assemblies.
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