Samarium cobalt (SMCO) magnets, the second generation of rare earth permanent magnets, have an irreplaceable position in the motor industry thanks to their high-temperature stability, excellent magnetic properties, and superior corrosion resistance. They are particularly advantageous in applications that require long-term stability and high precision under challenging conditions.
- Material Characteristics and Advantages
SmCo magnets are composed of samarium (Sm), cobalt (Co), and other trace elements, with two main types: SmCo₅and Sm₂Co₁₇.
- High-Temperature Capability: Operating temperatures up to 350℃, ideal for aerospace engines and high-speed motors.
- Stability: Low magnetic performance decay, suitable for continuous operation in precision motors.
- Corrosion Resistance: Performs reliably in marine and chemical environments without extensive protection.
Performance Index SmCo Magnet NdFeB Magnet Operating Temperature Range -250℃ to 350℃ -60℃ to 200℃ (BH)max 20-32 MGOE 35-52 MGOE Corrosion Resistance Excellent Moderate Cost High Medium
- Motor Application Scenarios
(1) High-Temperature Motors
Used in aerospace, nuclear power, and other extreme environments, SmCo magnets remain stable at 350℃.
(2) Precision Servo Motors
In automation and robotics, SmCo magnets’ low decay ensures long-term accuracy and quick response.
(3) Marine and Chemical Motors
Resist high humidity, salt spray, and acidic/alkaline conditions, ideal for seawater pump motors and marine exploration equipment.
(4) Aerospace Motors
Suitable for satellite attitude control systems, aircraft auxiliary power units, and other critical defense applications.
Comparison with NdFeB Magnets in Motor Applications
| Application Field | Recommended Material | Key Reason |
| High-Temperature Motors | SmCo Magnet | Stable at high temperatures |
| High Power Density Motors | NdFeB Magnet | Higher (BH)max, smaller volume |
| Corrosive Environment Motors | SmCo Magnet | Superior corrosion resistance |
| Cost-Sensitive Motors | NdFeB Magnet | Lower cost |
Development Trends
As motor performance requirements continue to rise in industries such as new energy vehicles, wind power, and robotics, samarium cobalt magnets will see greater demand in high-temperature, high-reliability applications. New energy vehicle drive motors must maintain stable output under prolonged, high-load conditions, while wind turbine generators are constantly exposed to high humidity and large temperature fluctuations. The high-temperature stability and corrosion resistance of samarium cobalt magnets perfectly meet these demanding requirements.
In robotics and high-end automation, high-precision servo motors have stringent requirements for magnetic stability; any magnetic attenuation can lead to reduced control accuracy. No futuro, optimizing manufacturing processes, improving grain uniformity, and refining sintering and surface treatment techniques will further enhance the comprehensive performance of samarium cobalt magnets.
In the SmCo magnet supply sector, Jlmag stands out with advanced manufacturing technology, strict quality management, and global service capabilities. They deliver high-performance magnetic solutions for electric vehicle drive motors, industrial automation, and aerospace applications, earning strong trust from customers worldwide.
