Eccentric Ferrite Arc Magnets: What They Are & Their Functions

In the rotor design of permanent magnet motors, magnetic arc segments are key components that directly determine magnetic field distribution and overall motor performance.
Eccentric arc magnets (also known as eccentric magnetic tiles) are an optimized structure developed based on standard equal-thickness magnets.
What is an eccentric arc magnet?
Unlike concentric arc magnets, where the inner and outer arcs share the same center, an eccentric arc magnet has different centers for its inner and outer radii.
This special geometry creates a gradually varying thickness across the magnet, from the thickest point to the thinnest point. This design is intentional, not a manufacturing defect — it is a precision-engineered magnetic circuit optimization.
Main functions of eccentric ferrite arc magnets
Produce a more sinusoidal air-gap magnetic field
Reduce magnetic harmonics effectively
Lower motor noise, vibration and cogging torque
Improve running smoothness and efficiency
Typical applications
Eccentric magnets are widely used in high-performance motors where low noise and stable operation are critical:
Inverter air conditioner compressor motors
New energy vehicle drive & auxiliary motors
High-speed, low-noise micro motors
High-efficiency permanent magnet synchronous motors (PMSM)
If you need custom eccentric ferrite arc magnets, rotor magnets, samples or quotations, welcome to contact us for professional support.

📩 shirley@gaumumagnet.com