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Development of Alnico Magnet Setter
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Development of Alnico Magnet Setter

Characteristics of AlNiCo Magnets:The relatively low coercivity of AlNiCo means that the magnet material is easily magnetized to a saturated state and is completely or partially demagnetized by an external magnetic field. This makes the AlNiCo magnet easy to magnetize when assembled into a part, but it may also cause self-demagnetization if the entire circuit is poorly designed. For example, removing the AlNiCo magnet from the motor assembly will leave the magnet in an open circuit and cause self-demagnetization (the operating point exceeds the "inflection point" of the intrinsic curve).

Self-demagnetization occurs because the magnetic field from the magnet can return through the magnet itself (the magnetic circuit is more preferable than the air around the magnet), so this is the external demagnetization field applied by the magnet to itself (all magnets are in a free state). A self-demagnetizing field will be applied to the space, but only magnets with a very low operating point and/or a very low intrinsic coercivity (Hci) value will show demagnetization).

The main advantage of this sensitivity to external magnetic fields is that AlNiCo is easy to "tune". In applications such as spectrometers, test equipment, and sensors, only when the applied magnetic field is within a precise range, the material being studied can give a uniquely identifiable result. This is where the low intrinsic coercivity of AlNiCo is extremely useful. You can use AlNiCo to build a magnetic component, magnetize it to full saturation (pulse strength is up to 1 Tesla, long life, and can overcome any eddy currents in electromagnetic steel components), and then intentionally magnetize it. The reverse field pulse is an attenuated negative oscillating waveform that sets the magnet in the assembly to the required field strength at the required position. This adjustment method is sometimes referred to as "rebound" or "setting." In this case, the magnet assembly should always be fully magnetized and then weakened, not just weakly magnetized. This is because "recoil" demagnetizes the magnet region (magnetic domain) with the worst intrinsic coercivity value. This leaves magnetic domains that are more difficult to demagnetize, resulting in a more stable magnet that is better resistant to accidental demagnetization (this is why "knockback" is also called "stable"). Some designs will deliberately require stabilization to provide design lower magnet performance, but with enhanced resistance to external magnetic field demagnetization.

Alnico Magnet Installer:In order to meet the needs of the sensor and motor industries, An AlNiCo magnet setter has been developed. The new magnet setter can completely magnetize an AlNiCo magnet in a magnet assembly and then automatically knock it back to the desired value. Use the integrated Gauss meter and simple man-machine interface to input the target Gaussian value into the control mechanism. Before pressing the start button to start the process, insert a magnet assembly into the custom coil. After the process is complete, the device will turn green and the components can be removed.

Depending on the sensitivity, the voltage change for each ignition can be increased in increments of one volt, allowing the Gauss for each ignition to vary from 1 Gauss.The attenuated oscillation waveform allows the device to be set to BSI standards and provides the most reliable long-term magnet performance.Although these units themselves are universal, they are customized by designing the coil surrounding the magnet assembly and the position of the magnet in it to suit the final application. The number of feedback Gaussmeters also varies according to the number of measurements required.


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