What kind of magnet do motor mostly use?
What magnets are commonly used in motor motors? Many friends want to know. Today Xiaofu comes to tell you in detail.
Neodymium-iron-boron high-intensity magnetic tile, a common type of DC motor, is shown below.
Nowadays, Nd-Fe-B magnets are mainly used in motor and motor. There are sintered magnets and bonded magnets. Why? Because the permanent magnet motor using Nd-Fe-B strong magnet as motor magnet has small size, light weight, high moment-inertia ratio, high servo system response, high power and speed/weight ratio, high starting moment and energy saving.
What are the common shapes of motor magnets?
The shapes of magnets used in motors are mostly tile, ring, bread or trapezoid. They can be used in different motor motors, such as permanent magnet motor, AC motor, DC motor, linear motor, brushless motor, etc. People usually use the attraction and repulsion of motor magnets and motor magnets to drive, and usually choose radially symmetrically magnetized tile motor magnets to form a ring, because sintered Nd-Fe-B is anisotropic material, so it is difficult to make complex magnetization direction. At present, there are also radiation magnetizing products of sintered Nd-Fe-B motor magnets, but there are many limitations on size and grade, and the magnetic properties are extremely unstable, the consistency is very poor, while the coils and magnetizing fixtures are expensive.
At present, the demand for motor magnets is very large. Magnets are the core components. NdFeB permanent magnets can be used in micro-special motors, small and medium-sized motors and large generators. Samarium-cobalt motor magnets are also used for special purposes. Ferrite magnets (tiles) are used in low-end products.
Electric vehicle motor is usually made of Nd-Fe-B magnetic tile plated with nickel or epoxy resin. It can withstand high temperature of more than 120 degrees, so it is made of SH material. Besides rare earth metal neodymium, iron and boron, there are addition of dysprosium, praseodymium, Terbium and cobalt. Some of them are magnets specially recycled from motors. To recover these metals.
Category of magnets commonly used in motors;
Injection molding magnet Multipolar ferrite ring Bonded NdFeb