Did you know about the motor Hall sensor magnetic ring?

Probably most people will feel strange when they hear this term. In fact, it often appears in our lives. It is usually used in the automobile industry, taxi meters, and inverters. Let ’s take a look at motors. Application principle of Hall sensor magnetic ring.

The motor hall sensor magnetic ring 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 usually uses multiple pairs of poles (even), such as 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 triggering: all-pole, bi-pole, and uni-pole. The existing water heater water flow sensor adopts the uni-pole latching method, that is, the N-pole and S-pole output a pulse when they pass the Hall-sensing position in turn. The signal, in other words, is a pair of pole magnetic poles output a pulse signal, and a plurality of pairs of pole magnetic poles output a plurality of pulse signals. Amorphous, nano-crystalline magnetic ring (ultra-microcrystalline iron core), the way of opening the air gap, the Hall chip is added in the middle, etc., to achieve the purpose of monitoring and sampling current. Used in new energy electric vehicle motor controller system, we have already supplied to several top motor controller manufacturers in the industry, with mature technology and experience, to provide a strong guarantee for your product quality!

Hall-effect magnetic rings are often used in brushless motors and some fixed-speed motors. In the brushless motor industry, they are also called hall-inductive magnetic poles because the motor sensor sensor magnetic rings are generally multi-pole magnetic rings. The working principle is to rely on the multiple magnetic poles of the magnetic ring to react with the Hall element in order to test the speed and efficiency of the motor, and to control the motor operation according to the signals provided by the Hall induction magnetic ring. The Hall voltage changes with the strength of the magnetic field. The stronger the magnetic field, the higher the voltage, the weaker the magnetic field, and the lower the voltage. The Hall voltage is very small, usually only a few millivolts, but amplified by the amplifier in the integrated circuit. This voltage can be amplified enough to output a stronger signal. If the Hall IC is used for sensing, a mechanical method is needed to change the magnetic induction intensity. The method shown in the figure below uses a rotating impeller as a switch to control the magnetic flux. When the impeller blade is in the air gap between the magnet and the Hall IC, the magnetic field deviates from the integrated chip and the Hall voltage disappears. In this way, the change in the output voltage of the Hall IC can indicate a certain position of the impeller drive shaft. Using this working principle, the Hall IC can be used as an ignition timing sensor. The Hall effect sensor is a passive sensor, which requires an external power source to work. This feature enables it to detect low-speed operation.

Hall current sensor cuts open air gap silicon steel magnetic ring silicon steel core. [Advantages] DC and AC complex high current, output small current stable signal, good consistency, high accuracy, small power difference, high performance. High magnetic permeability, low remanence, high saturation magnetic flux density, high precision and high efficiency. Resistant to excessive currents, current detection range from tens of amps to hundreds of amps and thousands of amps, not easy to saturate. It is used for Hall current transformer sensors, and is widely used in electric vehicle motor controllers for new energy vehicles.

It is precisely because the motor’s Hall sensor magnetic ring has many advantages such as firm structure, small size, light weight, convenient installation, long life, etc., and has been widely used in various fields.


Post time: Mar-11-2020