FERRITE DISC MAGNETS
What is a Ferrite Disc Magnet?
Ferrite disc magnets, also known as ceramic disc magnets, have a flat and round shape with a solid center and no through hole. Ferrite has a lower magnetic energy product than rare earth magnets such as neodymium magnets. Therefore, a larger magnet volume is usually required for the same magnetic force. Ferrite disc magnets are suitable for applications where magnet size is less restricted and cost, corrosion resistance, and long-term stability are important.
Custom Ferrite Disc Magnets
TOPMAG has provided custom ferrite disc magnet manufacturing services for many years. We can adjust the size, tolerance, and magnetization direction according to the product structure. This helps meet different assembly requirements.
Size Customization
Ferrite disc magnets are mainly defined by their diameter and thickness. TOPMAG can provide ferrite disc magnets in different diameters, thicknesses, and special sizes based on customer drawings and actual assembly requirements. For thin ferrite disc magnets, we also have the related machining and sintering capabilities.
At the same time, the ratio between diameter and thickness directly affects the magnetic performance and installation space for different applications. During customization, the suitable magnet size can be selected based on the required magnetic force, working distance, and available installation space.
허용 오차 제어
The dimensional tolerance of standard products can be controlled to around ±0.1 mm. For products that require higher dimensional accuracy, grinding and other post-processing methods can further improve dimensional consistency. The specific tolerance range should be confirmed based on the magnet size, manufacturing process, and assembly requirements.
Magnetization Options
The magnetization options for ferrite disc magnets are relatively focused. The main options include the following types:
- Through-Thickness Magnetization: This is the most common magnetization method for ferrite disc magnets. The N pole and S pole are located on the two flat surfaces of the disc. The magnetic force is generated along the thickness direction. This method is suitable for most magnetic holding and sensing applications.
- Diametrical Magnetization: The N and S poles are positioned on opposite sides of the disc along its diameter. It is suitable for specific sensors, magnetic encoders, and other applications requiring a different magnetic field orientation.
- Multi-Pole Magnetization: Multiple alternating N/S poles are formed on the working surface of the disc. The number and arrangement of the magnetic poles can be adjusted according to the magnetic circuit design. This method is mainly used in applications such as rotary encoders and sensors that require specific magnetic field distribution.
축 방향 자화
정반대 자화
Applications of Ferrite Disc Magnets
Ferrite disc magnets can be used in a wide range of industrial and consumer products according to their size and magnetization method.
Speakers and Audio Equipment: Used as driving magnets in speakers, buzzers, and other electroacoustic devices. They provide a stable and continuous magnetic field and are a common permanent magnet solution for traditional speakers.
Magnetic Switches and Detection Components: Often used with reed switches and Hall sensors to form trigger-type sensing structures for door alarms, cover detection, liquid level switches, and other applications.
Magnetic Holding and Closure: Used for magnetic fasteners, door catches, cover fixing, display devices, and other products that require magnetic holding force.
Office and Household Products: Used as core magnetic components in magnetic bookmarks, whiteboard accessories, business card holders, refrigerator magnets, and other daily-use products.
Ferrite Disc Magnet Features & Characteristics
- What is the difference between ferrite disc magnets and ring magnets?The main difference is the assembly method. Ferrite disc magnets have a solid center with no through hole. Ring magnets have a center hole and are suitable for shafts, screws, and other mounting applications.
- How thin can ferrite disc magnets be?Ferrite is relatively brittle. The minimum thickness depends on the diameter, size ratio, and manufacturing process. The specific specification needs to be evaluated based on the product requirements.
- How are ferrite disc magnets manufactured?Ferrite disc magnets are typically manufactured through powder preparation, forming, sintering, machining, magnetization, and performance testing. The specific process depends on the magnet size and performance requirements.
- Is small-batch prototyping available?For ferrite disc magnets with standard diameters and thicknesses, existing tooling can usually be used for fast prototyping. Non-standard or ultra-thin products require an evaluation in advance.
- What is the MOQ for ferrite disc magnets?The MOQ depends on the product size, specifications, and whether new tooling is required. Please provide drawings or specifications for an engineering and quotation evaluation.
다른 디자인의 디스크 자석
In addition to ferrite, disc magnets can also be manufactured from other magnetic materials. Different materials are suitable for different performance and cost requirements.
네오디뮴 디스크 자석 — Provide much higher magnetic force than ferrite magnets at the same volume. They are suitable for applications with limited space and high magnetic force requirements, such as portable devices and precision instruments.
Samarium Cobalt Disc Magnets — Offer excellent high-temperature performance. Their magnetic performance changes less at high temperatures. They are commonly used in aerospace, high-temperature industrial equipment, and other specialized applications.
Alnico Disc Magnets — Offer excellent temperature stability. Their magnetic performance is less affected by temperature changes. They are mainly used in precision instruments, measuring equipment, and other applications that are sensitive to temperature drift.