What magnet is used for the micro motor?
At present, most motor manufacturers use neodymium iron boron magnets as motor magnets and motor magnets. A few motor manufacturers also use samarium cobalt magnets and permanent magnet ferrites as motor magnets.
1, samarium cobalt has high temperature resistance (400 ° C), the color of the metal is bright, the price is relatively high, comprehensive consideration, micro-point is rarely used samarium cobalt.
2, the permanent ferrite, because the high temperature resistance (about 400 ° C) this aspect is better than NdFeB is unquestionable, but! It is necessary to make the micro-motor matching of the ferrite, and it is exquisite, the process cost is high, and the scrap rate is also high because it is easy to break or wear and tear.
3. The permanent magnet motor using the neodymium iron boron magnet as the motor magnet has small size, light weight, high torque-inertia ratio, high servo system response, high power and speed/weight ratio, high starting torque and power saving. The shape of the motor magnet and the motor magnet are mostly tile-shaped, ring or trapezoidal, and can be used in different motor motors, such as permanent magnet motors, AC motors, DC motors, linear motors, brushless motors, and the like.
The following describes NdFeB.
(1) People usually use the attraction and repulsive force of a magnet to drive. Generally, a radial symmetrically magnetized tile-shaped magnet is selected to form a ring shape, and the sintered NdFeB is an anisotropic material, which cannot be formed into a customer at one time. A slightly more complex magnetization direction is desired.
(2) NdFeB is also divided into sintered NdFeB and NdFeB, while NdFeB is more recognized by the industry. At present, some manufacturers can also do the radial magnetization of bonded NdFeB magnets, but there are many requirements for the size of the grades (the magnetic strength), and the magnetic properties also have the requirements for stability and consistency, while the mold coil And magnetizing fixtures are expensive, if not a stable quality supplier, very few manufacturers will choose to bond NdFeB. But if your home is a company that produces high-quality micro-motors, then bonded NdFeB is definitely the first choice for your magnets.
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