What Are High-Speed Motor Rotor Assemblies?
High-speed motor rotor assemblies (also called brushless magnetic rotors/high-speed magnetic rotors) are core magnetic components for permanent magnet high-speed motors, integrating precision iron structures and high-performance permanent magnets. Designed for ultra-high rotational speeds (30000–200000RPM), they are the key to converting electrical energy into mechanical energy, and critical for magnetic levitation (maglev) and air levitation high-speed motors.
Our rotor assemblies feature advanced magnet segmentation and lamination technology to minimize eddy current loss, while the optimized material combination ensures resistance to extreme centrifugal forces generated at ultra-high speeds. Every assembly undergoes rigorous electromagnetic simulation and dynamic balance testing, delivering reliable, high-efficiency performance for high-power industrial high-speed motor systems (1kW–600kW).
Core Features of Our High-Speed Magnetic Rotors
Ultra-High Speed Capability: Operable at 30000–200000RPM, withstands extreme centrifugal forces for maglev/air levitation motors
High-Grade Magnetic Materials: Adopts Sm2Co17 33H SmCo and N38AH NdFeB magnets, stable performance at high temperatures
Anti-Eddy Current Design: Magnet segmentation & laminated magnet technology reduces eddy current loss, boosts energy efficiency
Wide Power Range: Customizable 1kW–600kW to match diverse industrial high-speed motor requirements
Precision Dynamic Balance: Strict balance testing, no abnormal vibration at ultra-high speeds
Multi-Magnet Compatibility: Optional sintered NdFeB, SmCo, bonded magnet or ferrite magnet for specific applications
High Demagnetization Resistance: Magnets feature excellent anti-demagnetization performance, stable magnetic output in harsh conditions
Key Material Selection
We select permanent magnets for rotor assemblies based on application temperature, speed and power requirements, ensuring optimal performance and durability:
| Magnet Type | Grade Used | Core Advantages | Ideal Applications |
| Samarium Cobalt (SmCo) | Sm2Co17 33H | Extreme high-temperature stability, high coercivity, low demagnetization risk | 200°C+ high-speed motors, e-turbos, aerospace-grade equipment |
| Neodymium (NdFeB) | N38AH | High magnetic energy product, high power density, cost-effective | Medium-high temp industrial motors, compressors, blowers |
| Bonded Magnet | Custom Grades | Flexible shaping, high dimensional accuracy | Miniature high-speed motors, low-power blowers |
| Sintered Ferrite | High-Grade | High corrosion resistance, low cost | Low-speed/high-torque auxiliary high-speed motor components |
Engineering & Manufacturing Advantages
Our high-speed motor rotor assemblies are developed and produced with cross-industry technical expertise, ensuring industrial-grade reliability:
Electromagnetic Simulation: Pre-design simulation optimizes magnetic circuit distribution, maximizes energy conversion efficiency and minimizes magnetic loss
Precision Machining: High-precision CNC processing for iron components, tight dimensional tolerance to ensure perfect magnet assembly
Advanced Magnet Integration: Professional bonding and fixing technology, prevents magnet displacement under ultra-high centrifugal forces
Dynamic Balance Testing: 100% dynamic balance detection, meets industrial high-speed motor balance standards for vibration-free operation
Material Performance Testing: Full testing of magnet demagnetization curves at 20°C–300°C, ensures stable performance at different temperatures
Typical Applications
Our high-speed motor rotor assemblies are tailored for high-efficiency, ultra-high-speed industrial equipment, with core applications including:
Industrial Fluid & Air Systems
Compressors: High-speed air compressors, screw compressors for industrial production
Blowers: High-pressure centrifugal blowers, turbo blowers for environmental protection and ventilation
Automotive & Energy Systems
E-Turbos: Automotive turbochargers, electric superchargers for new energy vehicles
Turbine Energy: Small-scale gas turbines, steam turbines for distributed energy systems
High-Speed Motor Systems
Maglev/Air Levitation Motors: Core rotors for high-speed maglev pumps, air bearing motors
High-Power Industrial Motors: 1kW–600kW high-speed motors for aerospace, precision manufacturing
Customization Service
We offer flexible customization for high-speed motor rotor assemblies to match your specific motor design and application requirements:
Speed Customization: 30000RPM–200000RPM, optimized for maglev/air levitation/traditional high-speed motors
Power Tuning: 1kW–600kW, customized magnetic circuit and magnet grade for specific power needs
Material Selection: Custom SmCo/NdFeB/bonded magnet/ferrite magnet based on working temperature and cost
Structural Design: Custom iron component geometry, magnet segmentation scheme and lamination design
Prototype & Bulk Production: Support small-batch prototype testing and large-scale mass production, MOQ 1 piece
Quality Assurance & Reliability
All our high-speed motor rotor assemblies undergo multi-stage rigorous quality inspection to ensure ultra-high speed reliability:
Raw Material Inspection: Magnet performance testing, iron component material composition verification
Semi-Finished Product Testing: Dimensional accuracy detection, magnetic circuit distribution testing
Finished Product Testing: Dynamic balance detection, centrifugal force resistance testing, high-speed operation simulation
Performance Certification: Provision of magnet demagnetization curve reports and motor matching performance test reports
Long-Term Reliability: Accelerated aging testing, ensures stable performance for long-term ultra-high speed operation
Future-Oriented Design & Development
We keep pace with the development of high-speed motor technology, and our rotor assemblies are optimized for the latest industrial trends:
Efficiency Optimization: Continuous improvement of magnetic circuit design and material selection to reduce energy consumption
Miniaturization: Compact rotor design for small-volume high-power high-speed motors
Smart Integration: Reserved sensor installation positions for real-time monitoring of rotor operation status
Sustainability: Reduced rare earth material usage under the premise of ensuring performance, improved recyclability
Additive Manufacturing: Exploration of 3D printing for complex iron components, enabling more optimized structural design
SDM Magnetic Rotor
As one of the most representative magnetic assemblies, rotor assemblies are consists of iron part and permanent magnet. Actually, sintered Neodymium magnet, sintered Samarium Cobalt magnet, bonded magnet, and sintered ferrite magnet are all can be used for rotor assemblies according to different application, motor type and assembly process. It should be noted that laminated magnets made by magnet segmentation technology are also served to assemblies to decrease the eddy current loss.
