Customized Electric Motor Arc Magnet

This product covers arc-shaped magnets engineered specifically for use in electric motor assemblies and related rotational devices. These are not generic arc magnets - they are customized to your rotor or stator geometry, magnetization scheme, and mechanical tolerances. In motor design, careful matching between magnet shape, magnetic field orientation, and mechanical constraints is essential to achieving consistent torque and efficiency.

Unlike flat blocks or standard discs, arc magnets conform to circular motor housings. When precisely sized and magnetized, they help reduce vibration, smooth torque delivery, and enhance overall electromagnetic performance.

• Material: Sintered NdFeB (Neodymium Iron Boron)
• Shape: Arc / Segment - tailored to fit your rotor/stator profile
• Dimensions: Fully customizable (OD, ID, arc length, thickness)
• Magnetization: Radial, axial or multi-pole magnetic patterns per design
• Tolerance: ±0.3–0.5 mm standard (can tighten on request)
• Coating: Ni-Cu-Ni (standard); optional epoxy, zinc, PTFE for specific environments
• Temperature Handling: Standard grades up to ~80 °C; high-temp variants available upon request

Unlike off-the-shelf magnets, these components are engineered to specification and must align with motor clearances, pole count, and magnetic circuit design to avoid performance loss or assembly interference.

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Arc magnets are typically used in the rotating assembly of a motor:

• Rotors: Radially magnetized segments arrange around a shaft to generate uniform flux in brushless and synchronous motors.
• Stators: In certain designs, arc segments create controlled air-gap flux density for improved electromagnetic efficiency.
• Pole Counts & Field Distribution: Custom magnetization patterns manage flux density, torque ripple and cogging behaviour.

Providing CAD or drawing files with motor geometry, target pole count and air-gap specification ensures magnets are optimized for performance and assembly fit.

• Dimensional Precision: Tightly controlled machining ensures that magnets fit their housings without gap variation that can reduce performance.
• Flux Matching: Motors using segmented magnets benefit from matched pairs/groups with consistent magnetic strength.
• Thermal Planning: High-temperature motor applications should specify appropriate NdFeB grades to mitigate risk of demagnetization.

If your design demands alternate magnetization directions (e.g., multi-pole axial segments), this can be accommodated during manufacturing setup.

Custom arc magnets find use in electric systems where compact size and stable magnetic field are critical:

• Industrial brushless DC (BLDC) motors
• Electric vehicle drivetrains and actuators
• Robotics and motion control drives
• Generators and alternators
• Precision automation modules

Motor developers and assembly teams often adopt customized magnets early in the design cycle to avoid late-stage revisions or rebalancing.

We support CTO (Configure-to-Order) workflows as well as bulk orders for OEM projects. Customization services include:

• Tailored geometry and magnetization per design files
• Coating selection for corrosive or environmental exposure
• Tolerance control for automated assembly
• Packaging optimized for production line feed

For an accurate quote, submit your drawings (STEP, IGES), expected operating conditions, and projected annual volumes.

Each batch can be supplied with:

• Dimensional inspection reports
• Magnetic flux and coercivity measurements
• Coating and adhesion verification
• Traceability documentation

These reports assist with incoming quality checks and production acceptance criteria.

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