What are the types of shapes of strong neodymium iron boron magnets

Neodymium iron boron magnets, as the most powerful permanent magnet materials currently available, are known as the "magnetic king" and have a wide range of applications. In order to meet the needs of different scenarios, neodymium iron boron magnets are designed and manufactured in various shapes, ranging from standard geometric shapes to complex irregular structures, each with its specific application scenarios and magnetic performance characteristics. This article will comprehensively introduce the various shapes, types, characteristics, and applications of neodymium iron boron magnets.

Standard geometric shape
1. Circular series magnets

Circular magnets are one of the most common shapes in neodymium iron boron magnets, mainly including the following types:

Circular magnet: A flat circular magnet with a diameter greater than its thickness, having a wide and flat surface, a large magnetic pole area, and strong magnetic force. Commonly used in the fields of clothing, fashion accessories, home decoration, packaging, toys, etc.

Cylindrical magnet: A cylindrical magnet with a height greater than its diameter, which is usually magnetized axially (at both ends) or radially. Widely used in industries such as medical equipment, magnetic switches, sensors, etc.

Circular magnet: A magnet with a circular structure that can be magnetized axially or radially. Commonly used in devices such as speakers, valves, motors, etc.

2. Square series magnets

Square magnets are another standard shape in industrial applications:

Square magnet: A square magnet with equal length, width, and height, usually magnetized in the height direction.

Rectangular magnet: A rectangular magnet with varying lengths, widths, and heights, usually magnetized in the direction of the shortest side.

Bar shaped magnet: A bar shaped magnet with a length much greater than its width and height, with relatively weak magnetic force, commonly used for daily functions such as refrigerator stickers, cabinet door locks, etc.

The size identification of square magnets is usually length x width x height, for example, F20 x 15 x 10mm represents a square magnet with a length of 20mm, width of 15mm, and height of 10mm, and the magnetization direction is the 10mm thickness direction.

3. Curved magnet

Arc magnets mainly include:

Tile shaped magnet: also known as motor magnet tile, with a specific curvature, fixed on a circular rotor or stator, is a commonly used magnet shape in motors.

Fan shaped magnet: partially circular in shape, used for special motor designs.

The specification description of tile shaped magnets usually includes parameters such as outer arc radius (R1), inner arc radius (R2), chord width (W), axis length (L), etc. For example, R35.5 × 25 × 26 × 4 represents a magnetic tile with an outer arc radius of 35.5mm, height of 25mm, width of 26mm, and thickness of 4mm.

Customized shaped magnet
1. Perforated magnet

Countersunk magnet: a circular or square magnet with a countersunk hole that can be used with screws to secure it.

Straight hole magnet: a magnet with vertically drilled holes and consistent aperture.

The specification labeling method for perforated magnets is: circular magnets with countersunk holes are labeled with outer diameter x inner diameter x thickness. For example, D10 x M5 x 2 represents a circular magnet with an outer diameter of 10mm, countersunk hole inner diameter of 5mm, and thickness of 2mm.

2. Step shaped magnet

Magnet with different height steps, used in situations that require multi-level positioning or special fixation. The processing difficulty is relatively high, and the cost is 30-50% higher than that of conventional magnets.

3. Other shaped magnets
Trapezoidal magnet: a magnet with a trapezoidal cross-section.
Convex magnet: a magnet with a protruding structure.
Cake shaped magnet: a flat shaped magnet.
Hoof shaped magnet: a magnet shaped like a horseshoe.

These irregular magnets usually require customized processing according to customer needs, using precision machining techniques such as wire cutting, and the maximum size can reach 200mm × 150mm × 80mm or more.

Special design shape
1. Spherical magnet

A completely spherical magnet, commonly used in toys and decorations, such as the popular Buck ball. Spherical magnets can create various shapes by utilizing their magnetic pole characteristics. The specification is simply represented by the diameter D, for example, D5mm represents a magnetic ball with a diameter of 5mm.

2. Horseshoe shaped magnet

U-shaped magnets were originally designed to compensate for the insufficient strength of bar magnets. By pointing the two ends of the magnet in the same direction, the magnetic force is basically doubled. Mainly used for picking up small metal parts, it is also widely used in scientific experiments and teaching.

3. Bread shaped magnet

Specially designed arc-shaped magnets, named after their shape resembling bread, are mainly used in the design of special motors.

4. Cone magnet

Specially designed cone-shaped magnets for special application scenarios that require gradient magnetic fields.

Shape selection and application suggestions

General applications: standard shapes such as discs, cylinders, and squares have high cost-effectiveness and are suitable for most general scenarios.

Space limited: Thin circular or square magnets are suitable for applications with limited space.

Fixed requirements: Perforated magnets are easy to install and fix, and the countersunk design is more aesthetically pleasing.

Motor application: Tile shaped and fan-shaped magnets are the preferred choice for motor design.

Special scenario: Alien magnets can meet the needs of special equipment, but the cost is relatively high.

Creative Design: Spherical magnets are suitable for toys and creative products.

With the advancement of processing technology, the types of shapes of neodymium iron boron magnets are becoming increasingly diverse, which can almost meet the needs of any application scenario. When choosing the shape of a magnet, comprehensive consideration should be given to the application scenario, space constraints, magnetic circuit design, and cost factors to achieve the best usage effect and economic benefits.