Frameless torque motors
Large hip, knee, shoulder and torso joints benefit from compact design and high direct-drive torque.
Humanoid Robotics & Drive Technology
Humanoid Robots: 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 power density for mobile robotic systems
Humanoid robots require high torque, fast response and sensitive control in extremely limited installation space. In frameless torque motors and coreless cup motors, magnet grade, magnetization and geometry therefore directly determine power density, weight, dynamics and thermal stability.
Depending on joint size and load profile, high-remanence N52 and N52H grades as well as high-coercivity UH and EH magnets are particularly relevant. Spacemagnets Europe supports material selection and develops custom segments, radial rings and pre-assembled magnetic 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 motion
Homogeneous magnetization and defined field distribution support low cogging and smooth control.
Thermal security
H, UH and EH grades provide increased coercivity for overloaded or enclosed joints.
Typical magnetic applications in humanoid robots
Coreless cup motors
Lightweight, fast-response drives for fingers, grippers and other fine-motor functions.
Linear actuators and spindle motors
High force density for integrated actuators in enclosed 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 demand while holding position.
Haptics and voice-coil actuators
Dynamic magnetic circuits enable finely controlled forces, fast response and natural interaction.
Typical NdFeB grades for humanoid robots
Selection depends on torque demand, installation space, cooling and maximum counter-field. The following ranges provide technical guidance for design work.
| Magnet grade | Temperature guidance | Typical application |
|---|---|---|
| N52 / N52H | up to approx. 80 °C / 120 °C | Extremely compact coreless cup motors, finger and hand drives, and actively cooled joints |
| N50UH / N48UH | up to approx. 180 °C | Frameless torque motors in hips, thighs, shoulders and torso with high overload dynamics |
| N45EH / N48EH | up to approx. 200 °C | Enclosed high-load joints, spindle motors and actuators with limited heat dissipation |
The stated temperatures are not blanket approval values. Permissible operating temperature also depends on magnet geometry, counter-field, operating point, coating, cooling and safety margin and must be verified in the actual magnetic circuit.
Magnet shapes and manufacturing concepts
Radial rings and multipole magnetization
Radially oriented rings can support a uniform, near-sinusoidal field distribution and reduce assembly gaps – beneficial for low vibration and noise.
Thin segments and custom geometries
Arc, slotted and miniature magnets use the limited space in fingers, wrists and integrated actuators efficiently.
Segmentation and skewed-pole concepts
Adapted segmentation and magnetization angles reduce torque ripple, eddy-current losses and local heating.
GBD and HRE-reduced materials
Grain-boundary diffusion and optimized alloy concepts provide high coercivity with more efficient use of heavy rare earths.
Engineering priorities for robotic magnets
Magnetic precision
Tight flux, angular-error and pole-pitch tolerances support sensitive control and low noise.
Demagnetization margin
The operating point is protected against short overload currents, counter-fields and elevated winding temperatures.
Miniaturization
Thin walls, small radii and complex contours require stable machining and inspection processes.
Low electrical losses
Segmented or laminated magnets reduce eddy currents in high-frequency, dynamic drives.
Mechanical integration
Bonding, encapsulation and retention concepts secure magnets under shock, vibration and repeated acceleration.
Series consistency
Documented material, dimensional, coating and magnetic inspections ensure repeatable joint performance.
Optimize your robot joint and magnetic circuit with us
Send us torque, speed, temperature profile, installation space, pole count, magnetization and volume. Our engineering team supports material, geometry, simulation and ready-to-install magnetic assemblies.
Engineering resources
Magnetic assemblies and resolvers for robot joints
Compact servo drives in humanoid robots require high torque density and precise position feedback. NdFeB magnets, rotor assemblies and resolvers are coordinated for installation space, dynamics and service life.