NdFeB magnet

Accurately measuring magnetic field strength is critical for industries relying on neodymium (NdFeB) magnets, from quality control in manufacturing to optimizing applications in motors, sensors, and medical devices. A Gauss meter (or Tesla meter) is the go-to tool for this task. In this guide, we’ll explain how to use a Gauss meter effectively and why precise measurements matter for NdFeB magnet performance.   The working principle of the Gauss meter is mainly based on the application of the Hall effect: when a current-carrying conductor is placed in a magnetic field, due to the action of the Lorentz force, a transverse potential difference will appear in the direction perpendicular to both the magnetic field and the current. The gaussmeter is an instrument for measuring the magnetic field based on the principle of the Hall effect. The Hall probe generates a Hall voltage in the magnetic field due to the Hall effect. The measuring instrument converts the magnetic field strength value based on the Hall voltage and the known Hall coefficient. The current Gauss meter is generally equipped with a unidirectional Hall probe, which can only measure the magnetic field strength in one direction, that is, it can only measure the magnetic field strength perpendicular to the direction of the Hall chip. In some high-end measurement fields, there are also Hall probes that can measure three-dimensional magnetic fields. Through the conversion of the measuring instrument, the magnetic field strength in the X, Y, and Z axis directions can be displayed at the same time, and the maximum magnetic field strength can be obtained through trigonometric conversion.   Notes on using Gauss meter: 1. Do not bend the probe excessively When using a Gauss meter to measure the meter. The Hall chip at the end should generally be lightly pressed against the surface of the magnet. This is to ensure that the measuring point is fixed, and on the other hand, it is to ensure that the probe is close to the measuring surface and is horizontal to the measuring surface, but do not press hard.   2. Both sides of the Hall chip can be sensed, but the values ​​and polarities are different. The scale surface is used for convenient point selection and cannot be used as a measuring surface. The non-scale surface is the measuring surface.   The Gauss meter measures the magnetic field strength Bz of the default vertical measurement surface. The magnetic field strength B will be stronger than the center, but Bz is not necessarily stronger than the center. It is just the area limitation of the Hall chip measurement. Generally, the measured magnetic field strength of the corner is stronger than the center, at least not lower than the center magnetic field.   It is important to note here that when the magnetization directions are different, the measurement values ​​will differ greatly even for the same measurement surface.  

Multi-pole magnetic ring is a kind of ring magnet widely used in the field of motors. The characteristic of multi-pole magnetic ring is that there are many magnetic poles on one magnet, which is usually achieved by using professional magnetizing equipment. Through technological innovation, the stability and assembly problems of the user end are solved. It has become the first choice for servo motors such as power tools and EPS power steering motors.   Multi-pole magnetic rings can be divided into neodymium iron boron multi-pole magnet rings, ferrite multi-pole magnetic rings, rubber magnetic multi-pole magnet rings, and samarium cobalt multi-pole magnet rings according to different materials. Among them, the first three are more common on the market.     Among the above multi-pole magnetic ring materials, the one with the strongest magnetic force is the multi-pole magnetic ring made of NdFeB magnet material. NdFeB magnet is known as the "king of magnets" among magnets. It has a very high remanence and is mainly used in high-performance permanent magnet motors and sensors. In addition, according to different processes, NdFeB multi-pole magnetic rings are divided into sintered NdFeB multi-pole rings and bonded NdFeB multi-pole magnetic rings. The cost of rubber magnetic multi-pole rings and ferrite multi-pole magnetic rings is relatively low, but the magnetic force will be relatively weak.     The most widely used products at present are circular magnetic grids, water pump motors, sweepers, etc. The multi-pole magnetic ring made of samarium cobalt material is the most temperature-resistant multi-pole magnetic ring. The maximum temperature of this material can reach 350 degrees. It is the best magnet used in high-temperature environments. As for the number of poles of the multi-pole magnetic ring, it is also customized according to customer requirements. The highest number of magnetization levels can reach hundreds of poles or even more.   The application of multi-pole magnetic rings is not limited to high-performance permanent magnet motors and sensors, but also includes automobiles, CNC machine tools, household appliances, computers, robots and other fields, showing its important role in the development of automation, precision and permanent magnet motor design, manufacturing technology and control technology.