How to Choose the Size and Magnetic Force of Neodymium Iron Boron (NdFeB) Ring Magnets?

When selecting NdFeB ring magnets, size and magnetic force are the two most critical factors. Generally, the size of the magnet is determined by the space available for the actual application and the installation method, while the magnetic force is closely related to the required attraction or driving force. For example, ring magnets used in motors or sensors often require calculations combining the inner diameter, outer diameter, and thickness to ensure stable and efficient equipment operation. The correct size and magnetic force combination not only improves performance but also extends the lifespan of the NdFeB ring magnets.

NdFeB Ring Magnet Size Selection Guide

Inner Diameter and Outer Diameter

The inner diameter of the NdFeB ring magnet directly affects whether it matches the installed shaft or component, while the outer diameter determines the magnetic force distribution range. Generally, the inner diameter is slightly smaller than the diameter of the mounting shaft, and the outer diameter and thickness are adjusted according to the magnetic force requirements.

Thickness

Thickness is an important factor affecting magnetic strength. A larger thickness usually results in a stronger magnetic force, but the cost also increases. Therefore, a balance between magnetic force and price needs to be struck when selecting a model.

Shape and Tolerances

Common shapes for ring magnets include standard circular rings and irregularly shaped rings. Installation accuracy requirements should be considered when selecting, especially for high-speed rotating motor applications, where tolerance control is crucial.

Key Points for Selecting the Magnetic Force of Neodymium Iron Boron Ring Magnets

Magnetic Class Selection (N35~N52)

Higher magnetic classes result in stronger magnetic force, but also increase cost. N35~N42 is commonly chosen for conventional motors and sensor applications, while N45~N52 may be used for high-performance motors or industrial equipment.

Operating Temperature

Neodymium iron boron magnets are prone to demagnetization at high temperatures. Therefore, high-temperature neodymium iron boron magnets or specially coated ring magnets are required for high-temperature environments.

Attraction Force Calculation

Calculate the required magnetic force based on the load requirements of the application scenario to ensure that the magnet meets functional needs without causing installation difficulties or equipment damage due to excessive attraction force.

Examples of Neodymium Iron Boron Ring Magnet Applications

Motor Industry

Achieving high-efficiency power output by selecting appropriate ring magnet size and magnetic force.

Sensor Equipment

Precisely controls magnetic field strength to improve detection accuracy.

Industrial Machinery

When used to fix or separate metal parts, the strength of the magnetic force directly affects work efficiency.

When selecting NdFeB ring magnets, the matching of size and magnetic force is crucial. Users should make a comprehensive selection based on factors such as installation space, load requirements, magnetic level, and working environment. Furthermore, a reasonable size design and magnetic force selection not only ensures normal equipment operation but also extends magnet life and improves overall performance. Customized services are also an effective solution for ring magnets with special requirements.

Through scientific selection, you can ensure that NdFeB ring magnets perform optimally in motors, sensors, and industrial equipment while reducing the risk of failure.