Mn-Zn Ferrite Soft Magnetic Annular Metal Powder Magnet Cores JC158

Ring Core Nominal AL Value (Unit: nH/N²)

Defnition of inductance factor: AL = L/N²(nH /N²). The inductance per single winding turn. The unit is nanohenr. It is measured at the fux density of less than 1 mili-Tesla and the frequency of 100 kHz. The AL values are determined by dimension & permeability of the cores instead of materials.

Ring Core Dimensions

I. Advantages

1. High Saturation Magnetic Flux Density

   Definition: Under the influence of a magnetic field, ring-shaped metal powder magnets can achieve a high level of magnetic flux density per unit area.                                                                       Advantage: This characteristic enables ring-shaped metal powder magnets to excel in devices that require the generation of strong magnetic fields. For example, in electric motors, a high saturation magnetic flux density can increase the motor's output power; in transformers, it can enhance energy conversion efficiency and reduce energy losses.

2. High Curie Temperature

   Definition: The Curie temperature is an important parameter for magnetic materials, and ring-shaped metal powder magnets have a relatively high Curie temperature.                                         Advantage: A high Curie temperature means that ring-shaped metal powder magnets can maintain good magnetic performance even in high-temperature environments. In industries such as automotive and aerospace, where equipment may be exposed to high temperatures (e.g., sensors near car engines or magnetic components on aero-engines), the high Curie temperature property of ring-shaped metal powder magnets allows them to operate stably under these conditions.

3. Good Temperature Stability

   Definition: The magnetic performance of ring-shaped metal powder magnets changes relatively little under different temperature conditions.                                                                                           Advantage: This good temperature stability is particularly important in applications that are sensitive to temperature changes. For example, in the power modules of electronic devices, as the device's operating state and ambient temperature change, if the magnetic performance of the ring-shaped metal powder magnets varies significantly, it may lead to voltage instability and other issues. The good temperature stability of ring-shaped metal powder magnets can effectively reduce the occurrence of such problems.

4. Strong Anti-interference Ability

   Definition: Ring-shaped metal powder magnets have a strong resistance to external interfering magnetic fields.                                                                                                                                Advantage: In complex electromagnetic environments, such as industrial production workshops and areas near communication base stations where there are various sources of electromagnetic interference, the anti-interference capability of ring-shaped metal powder magnets ensures that they can still accurately perform their magnetic functions under magnetic field interference. For example, in high-precision magnetic field measurement instruments, the anti-interference ability of ring-shaped metal powder magnets can ensure the accuracy of measurement results.

5. Good Mechanical Properties

   Definition: Ring-shaped metal powder magnets possess certain mechanical strength and toughness.  Advantage: This makes them advantageous in applications that require the material to withstand certain mechanical stress. For example, in devices that operate in vibrating environments, such as the vibration generators in car engines, the good mechanical properties of ring-shaped metal powder magnets can prevent the magnet rings from cracking or getting damaged during vibration.

II. Application Areas

1. Electronic Component Field

   Inductor Elements: Ring-shaped metal powder magnets are ideal materials for making inductor elements. Due to their high saturation magnetic flux density and good magnetic permeability, they can achieve large inductance values in a small volume. They are widely used in the power filter circuits and radio frequency (RF) circuits of electronic devices. For example, in the RF modules of mobile phones, many inductor elements used for signal filtering and antenna tuning adopt ring-shaped metal powder magnets to improve signal quality and transmission efficiency.      Transformers: Ring-shaped metal powder magnets also play an important role in small transformers. Their high saturation magnetic flux density and low-loss characteristics help improve transformer efficiency and reduce size. For example, in switch mode power supply transformers, ring-shaped metal powder magnets can effectively transmit and convert electrical energy while reducing energy losses and heat generation, thereby improving the performance and reliability of switch mode power supplies.

2. Machinery Manufacturing Field

   Sensors: In the machinery manufacturing industry, sensors are an important part. Ring-shaped metal powder magnets can be used to make position sensors, speed sensors, etc. For example, in numerical control machine tools, sensors used for detecting tool positions and movement speeds may use ring-shaped metal powder magnets. Their high sensitivity and anti-interference ability can accurately detect changes in physical quantities and work stably in the machining environment.            Encoders: Ring-shaped metal powder magnets can also be used in optical encoders and magnetic encoders. In the control systems of automated production lines, such as robots and conveyors, encoders are used to measure positions and angles. The magnetic performance and durability of ring-shaped metal powder magnets can ensure the accuracy and reliability of encoders, thereby improving the automation level and production efficiency of the machinery manufacturing process.

3. Communication Field

   RF Devices: In the RF part of communication equipment, ring-shaped metal powder magnets can be used to manufacture RF inductors, filters, and other front-end components. For example, in the RF transmitters and receivers of base stations, the ring-shaped metal powder magnets used for making RF inductors can help achieve signal impedance matching, filtering, and power adjustment. Their high-frequency characteristics and low-loss features meet the requirements of RF signal processing, improving the working efficiency and signal quality of communication equipment.                      Isolators and Circulators: In communication systems, isolators and circulators and other non-reciprocal components are often used to prevent signal reflection and interference. Ring-shaped metal powder magnets can be made into non-reciprocal magnetic elements through special design and processing techniques, which are used in the microwave signal transmission lines of communication systems to protect the signal source and load from the impact of reverse signals, thereby improving the stability and reliability of communication systems.

4. Automotive Field

   Engine Sensors: Modern automotive engines are equipped with a large number of sensors to monitor and control the working state of the engine. Ring-shaped metal powder magnets can be used to make crankshaft position sensors, camshaft position sensors, etc. These sensors can accurately detect the rotation position and speed of engine components and provide precise data for engine fuel injection, ignition timing, and other controls. The high Curie temperature and good temperature stability of ring-shaped metal powder magnets allow them to work normally in the high-temperature environment inside the engine compartment.                                                                Electric Vehicle Drive Motors: In electric vehicles, drive motors are one of the key components. Ring-shaped metal powder magnets can be used in the rotors or stators of drive motors to improve the power density and efficiency of the motors. Their good mechanical properties and anti-interference ability enable them to adapt to the vibration and complex electromagnetic environment during the driving of electric vehicles, ensuring the stable operation of the motors.