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Multipole magnet refers to a magnet with more than one magnetic pole on one surface of the magnet. Most of these magnets are mainly circular and are widely used in various magnetic sensors, permanent magnet DC motors, and their installation distance is highly concerned. Some netizens have asked if the distance between a multipolar magnet and a Hall sensor must be within two millimeters? Permanent magnet manufacturer NST Xiaofu will introduce this issue.
The optimal working distance between a Hall sensor and a multipole magnet is not fixed. It can be 2mm or other distances depending on the sensitivity of the Hall sensor, the magnetic field strength, material, and number of magnetic poles of the magnet.
In terms of magnet types, magnets made of high-performance magnetic materials such as neodymium iron boron (NdFeB) can provide stronger magnetic fields at longer distances, thereby improving the effective detection range of Hall sensors.
Bonded neodymium multi-pole magnetic ring
In terms of magnetic field strength, a stronger magnetic field can allow for greater distances.
Sensitivity of Hall sensors: Different models of Hall sensors have different sensitivities, and high sensitivity sensors can be slightly farther away.
Furthermore, the number of magnetic poles in a magnet also affects the distance between a multipole magnet and a Hall sensor. Compared to simple bipolar (2-pole) magnets, multipole magnets (such as 4-pole, 8-pole, etc.) have more stringent requirements for the distance between the Hall sensor. Typically, the sensor needs to be tightly attached within a range of 2 millimeters to achieve optimal performance and accuracy.
So, sometimes in order to ensure that the Hall sensor can stably detect magnetic pole changes, especially in precision control or space limited situations, it may be required that the distance between the sensor and the magnet be as small as possible (such as less than 2 millimeters). 2mm is a reasonable value, but it is not necessary. In practical applications, the appropriate distance can be selected within the range of 1-5 millimeters according to the specific situation.
Our company is a professional supplier of multipole magnets, which can provide you with multipole magnets of various materials and magnetic poles. If you need sample testing and price evaluation, please feel free to contact us.
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