1. Product Introduction

Arc sintered NdFeB magnets, also known as motor arc magnetic tiles, are a special type of shaped rare-earth permanent magnets. Featuring inner and outer arc curved structures, they perfectly fit the annular assembly positions of motor rotors and stators. Replacing traditional block magnets, they optimize internal magnetic fields, reduce motor cogging torque, improve output torque and enhance overall operating efficiency.

Custom arcs, central angles, thicknesses and hole structures are available according to motor drawings. Suitable for low and high-temperature working conditions, they are the core magnetic components of brushless permanent magnet motors.

2. Product Types

1) Standard Arc Magnetic TilesRegular single-arc magnets with finely polished inner and outer curved surfaces, no holes. Widely used in fans, household appliance motors and small power tools.

2) Arc Magnets with Countersunk HolesIntegrally machined countersunk holes allow screw fastening, effectively preventing falling off during high-speed operation. Ideal for servo motors and high-power industrial motors.

3) Large Central Angle Sector MagnetsWide-angle sector magnetic tiles specially applied in new energy vehicle drive motors, rail transit traction motors and high-power generators.

4) Ultra-thin & Narrow Miniature Arc MagnetsUltra-thin and micro curved magnets matching drone motors, gimbal voice coil motors, miniature sensors and micro water pump motors.

5) Segmented & Special-shaped Arc MagnetsIntegrated multi-section, single-side chamfered and step-shaped arc magnets, customized for non-standard automated motors and inverter compressors.

3. Magnetic Grades & Temperature Resistance

For detailed magnetic parameters, please refer to our >>> NdFeB Magnet Performance Chart<<<

N Series (N35–N52): 80℃ max — Small household appliances & fan motors

M Series (33M–48M): 100℃ max — General power tools & small water pumps

H Series (33H–48H): 120℃ max — Servo motors & variable-frequency household equipment

SH Series (30SH–45SH): 150℃ max — Electric vehicles & industrial fan motors

UH Series (28UH–40UH): 180℃ max — Automotive EPS & high-power industrial motors

EH/AH Series (28EH–40AH): 200–230℃ max — High-speed motors & new energy drive motors

4. Surface Anti-corrosion Coatings

Ni-Cu-Ni Plating: 48-hour salt spray resistance, standard industrial coating for motors, wear-resistant and rust-proof.

Black Epoxy Coating: Excellent salt spray performance for humid environments, water pumps and outdoor fans.

Zinc Plating: Cost-effective coating for indoor ordinary motors and small household magnetic components.

5. Processing Technology &amp; Precision

Sintered blank forming → CNC inner & outer arc grinding → end face precision grinding / drilling & countersinking → chamfering & deburring → full dimension inspection → anti-corrosion electroplating → radial magnetization → pole marking & packaging

Arc tolerance: ±0.03mm

Overall dimensional tolerance: ±0.01~±0.05mm

Support small-batch prototyping and large-scale mold mass production. Complex arc shapes can be processed by wire cutting.

6. Core Advantages

Perfect Fit for Motor StructuresCurved surface closely fits the rotor without assembly gaps, ensuring uniform magnetic field distribution and effectively reducing motor vibration and noise.

High Magnetic Energy & Energy SavingHigh magnetic energy product enables smaller motor size and lower copper loss at the same power, improving battery life and energy efficiency.

High Temperature & Demagnetization ResistanceComplete high-temperature grade options ensure no irreversible demagnetization during continuous high-speed and high-temperature operation.

Anti-loosening for High-speed OperationIntegrated countersunk hole design allows firm screw locking, suitable for high-speed and high-power motors.

Full Custom DimensionsCustom inner/outer diameter, central angle, thickness, hole size and chamfer according to customer drawings or samples.

Stable & Corrosion-resistant CoatingMulti-layer eco-friendly electroplating adapts to vehicle, outdoor and humid industrial environments.

7. Main Applications

New Energy Vehicles: Drive motors, EPS steering motors, water pump and brake assist motors

Industrial Automation: Servo motors, robot joint motors, linear motors, inverter compressors

Power Tools: Brushless motors for electric drills, angle grinders and lithium wrenches

Wind Power & Generation Equipment: Small wind turbines, permanent magnet synchronous generators

Home Appliances & HVAC: Air conditioner fans, washing machine motors, fresh air system motors

Rail Transit & Elevators: Elevator traction motors, rail transit auxiliary traction motors

Micro Precision Equipment: Drone gimbal motors, voice coil motors, medical instruments and sensors

8. Selection & Usage Precautions

NdFeB magnets are brittle. Please assemble with gentle pressure and avoid violent impact. Chamfer design is recommended for sharp corners to prevent edge chipping.

For high-speed rotating motors, prefer countersunk hole types to avoid falling off caused by adhesive failure under high temperature.

Select SH/UH/EH high-temperature grades if the motor long-term working temperature exceeds 120℃.

Radial magnetization is the standard for motor magnetic tiles. Custom multi-pole directional magnetization is available for special magnetic field requirements.

Mass production with customized molds can reduce unit cost and shorten delivery time.

9. Our Advantages

We are equipped with professional full-range inner and outer arc grinding equipment for motor magnetic tiles. Our engineers provide free magnetic scheme optimization according to motor power, speed and working temperature. Fast drawing quotation and sample support are available.

We support customized arc NdFeB magnets for new energy motors, servo motors and power tools. OEM/ODM one-stop services are provided.