We are constantly trying to improve ourselves in new thoughts, new technology and new working methods.
R16.4xr14.2x25.7°xL7
SHINE
| Quantity: | |
|---|---|
Shine Magnetics introduces its N45SH sintered NdFeB block magnets, specifically engineered for industrial-grade drone motors, as well as the propulsion systems of multi-rotor and fixed-wing unmanned aerial vehicles (UAVs). Utilizing the high-performance N45SH grade, these magnets boast a maximum energy product of 43–45 MGOe and an intrinsic coercivity (Hcj) of ≥ 15 kOe (with actual values typically exceeding 20 kOe, corresponding to the SH grade). Capable of operating at temperatures up to 150°C, they maintain an exceptionally low demagnetization rate—even during high-speed motor operation and in high-temperature environments.
The product features a standard block geometry (with typical dimensions such as 20×10×5 mm; custom sizes are available) and is finished with a triple-layer nickel-copper-nickel (Ni-Cu-Ni) coating. Having successfully passed a 48-hour salt spray test, the magnets effectively resist the corrosive effects of humidity, salt mist, and the chemical environments found within motor assemblies. The magnets' high residual induction (Br ≥ 13.2 kGs) and high coercivity characteristics enable drone motors to achieve greater power density, more compact magnetic circuit designs, and reduced copper losses—thereby extending flight endurance and enhancing payload capacity.
Suitable for a wide range of drone motor applications:
Disc-type motors for aerial photography drones
High-speed brushless motors for racing drones
Heavy-duty motors for agricultural plant protection drones
Propulsion systems for industrial mapping and inspection drones
Shine Magnetics offers comprehensive, one-stop customization services ranging from raw blanks to finished products. We provide tight dimensional tolerances for block sizes (up to ±0.03 mm), a choice of magnetization patterns (including parallel, through-thickness, or multi-pole magnetization), and various post-processing options such as adhesive backing and plastic encapsulation.
| Main Application | Used for drone motors |
| Place of Origin | Ningbo, China |
| Brand | SHINE |
| Grade | N45SH |
| Type of Coating | Nickel Plating |
| Size | R16.4mmxr14.2mmx25.7°xL7mm |
| Processing Service | Shaping, Sintering, Cutting, Plating |
| Packaging | Antirust paper, gasket, vacuum packaging, inner cell foaming material, carton, plastic box, protective pallet transportation |
| Transport | Express delivery, logistics, sea or air transportatio |
| Re: The data above is only for your reference. Please contact us for more details. | |
1. Drone power system
Used for brushless motors in multi rotor and fixed wing unmanned aerial vehicles to enhance hover stability, climb efficiency, and dynamic response, meeting the needs of aerial photography, agricultural crop protection, logistics transportation, and other scenarios.
2. New energy and intelligent devices
Expand to high-performance scenarios such as electric vehicle drive motors, wind turbines, and consumer electronics (such as hard disk drives and wireless charging modules).
3. Customized solutions
Provide magnetic circuit design optimization services to support customized motor requirements for extreme environments (low temperature, strong vibration) in multiple fields.
The following are the conventional magnetization methods. If there are special magnetization requirements, please contact us for consultation!
1. Compared to standard N45 magnets, what advantages do N45SH neodymium magnets offer for drone motors?
N45SH magnets possess a higher intrinsic coercivity (Hcj ≥ 20 kOe), enabling them to withstand the high temperatures—up to 150°C—generated during the high-speed operation of drone motors. In contrast, standard N45 magnets (Hcj ≥ 12 kOe) begin to experience significant demagnetization at temperatures exceeding 80°C. Utilizing N45SH ensures that the motor's magnetic properties remain stable under sustained high-current loads, thereby preventing a decline in thrust or a reduction in flight duration caused by demagnetization.
2. Is the nickel plating on these block magnets suitable for the humid outdoor environments in which drones operate?
Yes. Our triple-layer nickel-copper-nickel (Ni-Cu-Ni) plating has successfully passed a 48-hour neutral salt spray test (ASTM B117) without exhibiting any signs of red rust on the surface. Furthermore, the plating is dense and uniform in thickness (15–25 μm), effectively preventing oxidation of the NdFeB substrate and meeting the requirements for the long-term use of drones in rainy, high-humidity, or coastal environments.
3. Is it possible to order custom-sized block magnets? What is the Minimum Order Quantity (MOQ)?
Yes, absolutely. We support the customization of block magnets in any size, with thicknesses as low as 1 mm and lengths/widths ranging from 3 mm to 100 mm. For the sampling stage, the MOQ is 10 pieces; for mass production, the standard MOQ is typically 1,000 pieces, though this may vary depending on the complexity of the dimensions. We also provide complimentary consultation regarding dimensional tolerance specifications.
4. What is the maximum operating temperature for N45SH magnets? Is additional cooling required within a drone motor?
The maximum continuous operating temperature is 150°C, and the magnets can withstand temperatures up to 180°C for short durations (a few minutes). In typical drone motors, winding temperatures are usually maintained below 120°C; therefore, N45SH magnets can be safely utilized without the need for additional cooling designs. However, if the motor design is particularly compact or subjected to continuous high-load operation, we recommend consulting with us regarding an upgrade to the N45UH magnet grade, which is rated for temperatures up to 180°C.
5. How should the magnetization direction for these block magnets be selected? What impact does this have on motor performance?
Based on the magnetic circuit topology of the motor, common magnetization methods include:
Thickness Magnetization (Most Common): Magnetic flux passes through the magnet along its thickness direction; suitable for motors with radial magnetic fields.
Axial Magnetization: Suitable for planar motors or specialized disc-type motors.
Multi-pole Magnetization: Directly creates an array of alternating-polarity poles, thereby simplifying assembly.
Based on the motor rotor drawings you provide, we can recommend the optimal magnetization scheme to maximize the air-gap magnetic flux density.
6. Are these magnets suitable for high-speed drone motors (e.g., 50,000 RPM)?
Yes. The N45SH grade possesses high mechanical strength (with a bending strength of approximately 250 MPa). Additionally, we can employ epoxy resin impregnation or metal sleeving techniques to enhance the magnet's resistance to centrifugal forces. For block magnets, we recommend incorporating a chamfered design (rounded corners) to mitigate stress concentration at sharp edges. The specific maximum allowable rotational speed must be evaluated based on the magnet's dimensions in conjunction with the bonding process utilized.
7. How can I request samples or technical specifications?
You may directly click the "Inquire Now" button located on this page, or send an email to sales@shinemagnetics.com. Please provide the required block dimensions, tolerances, magnetization direction, and target motor parameters; our engineers will respond within 24 hours with a detailed technical specification sheet (including magnetic performance curves, plating reports, and dimensional drawings).
