Anti Eddy Current SmCo Arc Magnets with Oxidation Resistance Coating

What Are SmCo Arc Magnets?

Samarium Cobalt (SmCo) arc magnets are premium rare earth permanent magnets formulated with samarium, cobalt and other metal alloys. Dubbed the high-temperature champion of magnetic materials, they are engineered exclusively for rotating machinery, motor rotors and stators.

Boasting a unique curved arc shape (also known as segment or tile shape), these magnets perfectly fit the cylindrical structure of motors, delivering exceptional magnetic field stability and reliability in extreme operating environments. Outperforming Neodymium (NdFeB) magnets at temperatures above 150°C, SmCo arc magnets are the material of choice for aerospace, defense and high-performance industrial motor applications.

Core Advantages of SmCo Arc Magnets

Exceptional High-Temperature Resistance

Operable at a maximum temperature of 250°C to 350°C with minimal magnetic performance attenuation at elevated temperatures, far surpassing ordinary permanent magnetic materials.

Superior Corrosion Resistance

Ultra-low iron content endows SmCo magnets with inherent oxidation and corrosion resistance. No additional coating (e.g., electroplating) is required for most applications, significantly reducing maintenance costs.

High Coercivity (Demagnetization Resistance)

Features extremely high intrinsic coercivity, maintaining stable magnetism even in strong reverse demagnetizing fields.

Low Temperature Coefficient

With a typical remanence temperature coefficient of -0.03%/°C, it ensures precise magnetic field output in temperature-fluctuating environments.

SmCo Arc Magnet Technical Specs & Material Grades

We offer two main SmCo material grades to meet diverse application requirements, with both grades requiring precision grinding due to inherent brittleness:

Note: Due to the brittle nature of SmCo materials, we recommend incorporating protective structures in the design phase to avoid severe impact and collision.

SmCo Arc Magnet Applications

Aerospace and Defense

• Aircraft Systems: SmCo magnets are used in various aircraft components due to their ability to withstand extreme temperatures and harsh conditions without losing their magnetic properties.

• Space Applications: Their excellent temperature stability and resistance to demagnetization make them ideal for space applications, including satellite and spacecraft systems where exposure to radiation and extreme environmental conditions is common.

• Military Equipment: SmCo magnets are employed in military hardware, such as guidance systems, sensors, and actuators, due to their robust performance in demanding environments.

Automotive Industry

• Electric and Hybrid Vehicles: SmCo magnets are utilized in the motors of electric and hybrid vehicles. Their high magnetic strength and excellent thermal stability make them suitable for use in electric vehicle motor drives that operate at high temperatures.

• Sensors and Actuators: Due to their reliable performance under thermal stress, these magnets are also used in automotive sensors and actuators.

Medical Technology

• Medical Devices: SmCo magnets are crucial in medical applications, particularly in devices where operational reliability is essential under varying temperatures, such as in magnetic resonance imaging (MRI) machines and other specialized medical equipment.

Industrial Applications

• High-Temperature Environments: Industries that operate equipment at high temperatures frequently use SmCo magnets because of their ability to maintain magnetic properties at elevated temperatures.

• Motors and Generators: SmCo magnets are used in high-performance motors and generators, particularly where space is limited and high magnetic strength is required.

• Magnetic Couplings and Bearings: These applications benefit from SmCo magnets due to their strength and stability, providing effective operation without physical contact and reducing wear and maintenance.

Electronics

• Sensors: SmCo magnets are used in various sensor applications due to their stable magnetic output over a wide range of temperatures, which is crucial for accurate readings and reliable device performance.

Energy

• Wind Turbines: The use of SmCo magnets in wind turbine generators can be advantageous, especially in high-temperature environments where other magnet types might demagnetize.

The unique combination of high magnetic strength, excellent temperature stability, and resistance to corrosion makes SmCo magnets particularly valuable in these fields, where performance and reliability are critical under extreme operating conditions.

Why Choose SDM SmCo Arc Magnets?

Precision Customization

Customize various radii, arc lengths and thicknesses according to customer drawings, with tolerance control up to ±0.05mm for perfect fit with your motor design.

Multiple Magnetization Directions

Provide radial magnetization, axial magnetization and paired magnetization services to match different magnetic circuit design requirements.

Strict Quality Inspection

Every batch of products undergoes comprehensive testing, with a detailed magnetic performance test report covering appearance, dimensional accuracy and magnetic flux to ensure consistent quality.

Standdard Packaging and Shippment

• Vacuum Packaging for All Rare Earth Magnets.

• Shielding box and Wooden Box to Protect the Rare Earth Magnets During Shipping.