Maximize torque density and minimize rotor inertia with our External Field Halbach Rotors.
Suitable for:
– High-performance Brushless DC (BLDC) motors
– Permanent Magnet Synchronous Motors (PMSM)
– And high-speed generators.
These assemblies concentrate magnetic flux on the outer diameter (OD).
Meanwhile, virtually canceling the field at the inner diameter (ID).
This ‘self-shielding’ topology eliminates the need for heavy ferrous back-iron on the rotor.
And significantly reduce rotating mass and inertia.
The result is a motor with faster acceleration, higher power-to-weight ratio, and superior efficiency.
Our Halbach rotors deliver the pure, sinusoidal magnetic waveform required for smooth, low-cogging operation.
No matter you are designing propulsion systems for UAVs/Drones, electric turbomachinery, or high-speed spindles.
Engineering & Manufacturing Capabilities
High-RPM Retention Systems:
Centrifugal force is the enemy of high-speed rotors.
We use advanced retention strategies beyond simple bonding:
– Carbon Fiber Sleeving: Pre-tensioned composite overwraps for ultra-lightweight containment (ideal for aerospace/drones).
– Metallic Sleeves: Thin-wall Inconel or Non-Magnetic Stainless Steel interference-fit sleeves for extreme thermal environments.
Dynamic Balancing:
A magnetic rotor is a mechanical flywheel.
We perform ISO 1940-1 Grade G2.5 or G1.0 dynamic balancing on all rotor assemblies.
Ensure vibration-free operation at speeds exceeding 50,000+ RPM.
Eddy Current Reduction:
We laminate our magnet segments (segmentation) both axially and circumferentially.
Minimize eddy current losses.
Prevent rotor overheating during high-frequency operation.
Customization Options
Organize by the variables that affect motor performance.
A. Magnetic Waveform Optimization
We tailor the Halbach array geometry to match your stator winding:
Sinusoidal Flux:
Optimized magnet shapes to produce a pure sine wave Back-EMF.
Essential for minimizing torque ripple and audible noise in precision servo motors.
Trapezoidal Flux:
For high-torque BLDC drives where raw power is prioritized over smoothness.
B. Thermal Grades & Stability
Motors run hot. We select materials that won’t demagnetize under load:
High-Temp NdFeB:
Grades N42SH (150°C), N38UH (180°C), and N35EH (200°C) are standard for our rotors.
Samarium Cobalt (SmCo):
For aerospace and defense applications requiring stability up to 350°C with zero corrosion risk.
C. Mechanical Interface
Shaft Integration:
We can bond the array directly onto your supplied shaft.
Or manufacture the complete rotor assembly (shaft + magnet + sleeve) in-house.
Hollow Rotors:
The Halbach array shields the ID.
We can build large-diameter hollow rotors for “Outrunner” motors or hub motors.
Allow cabling or cooling to pass through the center.
Stop losing torque to heavy iron.
Switching to a Halbach rotor requires precise calculation of hoop stress and magnetic loading.
Let’s validate your rotor design.
Contact our engineering team with your Target RPM, Torque Requirements, and Stator Dimensions.
We will simulate the Air Gap Flux Density.
And recommend the optimal retention sleeve for your operating speed.
