Brushless motors and some fixed-speed motors often use Hall induction magnetic rings. In the brushless motor industry, they are also called Hall induction magnetic poles, because Hall induction magnetic rings are generally multi-pole magnetic rings, and their working principle is Relying on the multiple magnetic poles of the magnetic ring to induce the Hall element, in order to test the speed and efficiency of the motor, and to control the operation of the motor according to the signal provided by the Hall induction magnetic ring.
The magnetic ring of the Hall sensor generally does not need too strong magnetism. As long as there are multiple magnetic poles arranged evenly and can provide magnetic pole signals to the Hall element, the Hall element can get the signal to work normally.
Therefore, the Hall induction magnetic ring is mostly the same-sex ferrite magnetic ring. This ferrite magnetic ring is magnetically stable and has clear magnetic poles, which provides a stable magnetic pole signal for the Hall induction element, so it is widely used in speed measurement. According to the requirements of brushless motors, there are two types of axial multi-pole magnetic ring and radial multi-pole magnetic ring. The surface magnetism of the magnetic ring is generally around 1000GS, so the magnetism is not too strong or weak, just enough for Hall induction. The original parts provide signals without affecting the normal operation of the magnetic ring of the motor itself.
Because the industry is different, the terminology for the product is also different. There are also Hall induction magnetic rings, multi-pole induction magnetic rings, Hall induction magnetic poles, radial induction magnetic rings, radial multi-pole magnetic rings, etc. After understanding the usage of the product, most of them can be determined to be the Hall induction magnetic ring. The same-sex radial multi-pole Hall induction magnetic ring is low in price and magnetically stable. It is widely used in brushless motors, stepping gear motors and other products.
Motor Hall sensor magnetic ring. The Hall sensor is a magnetic induction sensor. The magnetic ring and the Hall element form an induction combination. The magnetic ring rotates with the rotor, and the Hall induction rotates with the rotor. The magnetic ring of the motor Hall sensor usually adopts multi-pole (even number), For example, 2 pairs of poles, 3 pairs of poles, 4 pairs of poles, etc., each pair of poles is divided into N and S poles. There are three types of Hall element triggers: omnipolar, bipolar, and unipolar. Existing water heater water flow sensors mostly use unipolar latching, that is, when the N pole and S pole pass through the Hall sensing position in sequence, a pulse is output. The signal, in other words, is a pair of magnetic poles outputting a pulse signal, and multiple pairs of magnetic poles outputting multiple pulse signals. It can be seen from this that the number of poles of the magnetic ring determines the number of pulse signals. The more the number of poles of the magnetic ring, the more the number of pulse signals generated by one revolution of the rotor, and the higher the accuracy of the Hall water flow sensor. The existing Hall bipolar can output a pulse signal for each of the S pole and the N pole, which is double the pulse signal output by the unipolar latch.
What is the difference between the magnetic core and the iron core of the Hall sensor of the motor? The iron core is often said to be generally made of silicon steel sheet. The iron core of the Hall sensor, also known as the magnetic core, magnetic gathering ring, etc., is generally made of high magnetic permeability materials such as permalloy. The magnets used in Hall sensors are mainly magnetic rings, and most of them use injection molded ferrite magnetic rings.
Injection molded ferrite radial 18-pole Hall induction magnet, how many poles can the induction injection molded ferrite magnetic ring of the motor Hall sensor magnetic ring have? Number of magnetic ring poles: Generally, the number of poles is related to the diameter of your product. The larger the number, the more poles you can make. Classification of magnetic rings for motor hall sensors: magnetic rings are mainly divided into: anti-interference magnetic ring specifications, ferrite magnetic ring specifications, clip-type magnetic ring specifications, flat magnetic ring specifications, assembled magnetic ring specifications, double-hole magnetic ring specifications, Three-hole magnetic ring specifications, six-hole magnetic ring specifications, etc.! Magnetic force of injection molding: Generally, the surface magnetism of injection molding magnets is about 1200-1300Gs, and the highest can reach about 1700Gs.
The Hall sensor is a magnetic field sensor, which is based on the Hall effect. It is widely used in detection technology, information processing and industrial automation technology. The Hall device has many characteristics, it is small in size, light in weight, easy to install, low in power consumption, high in frequency and long in life, resistant to vibration and not afraid of oil pollution, etc.