Single-sided multi-pole magnetization means that one surface of a magnet has multiple poles, while the other side has almost no magnetism. Such a magnet we call a single-sided multi-pole magnetizing magnet, to the magnetizing wire on the trap to be magnetized magnetic ring, adjacent magnetizing pole head coil winding direction opposite, after magnetizing will show a number of N, S pole; Multi-pole magnetizing magnet production is to use some multi-pole magnetizing fixture inside the magnetizing. At present, the multi-pole magnetization can replace the magnetic tile, simplify the motor structure, and optimize the motor performance.
The following is a brief introduction of the following magnetization methods:
1. Mosaic method; The general aluminum nickel cobalt metal permanent magnet N-S-N... Uniformly embedded in a non-magnetic cylinder, making a multipole magnet. This method is complicated in process, high in cost and difficult in miniaturization.
2. Patchwork method; Press multiple permanent magnets S-N-S... Uniformly bonded directly into a ring multipole magnet. The disadvantages are similar to those of tessellations.
3. Solenoid method; This is a good and effective magnetization method, which is still widely used at present. The disadvantage is that it is difficult to miniaturize, for small diameter, pole number of magnetic ring, such as the outer diameter of 14mm or 16mm, to fill 24 pole is even more impossible.
4. Magnetic line bombardment; It is an advanced magnetization method, which is suitable for the inner and outer magnetization of the magnetic ring with small diameter and large number of poles. For example, 14mm or 16mm magnetic ring. Charging 24 poles. Can meet the needs of hundreds of watts DC synchronous motor.
Engineering, the number of coils is generally selected 5-30 turns, the magnetic body is generally selected industrial pure iron, coil current is generally dozens to hundreds of amperes, magnetic circuit length is generally a few centimeters or dozens of centimeters. The specific parameters should be selected reasonably according to the magnetizing equipment, the shape size of the magnetized product and the number of magnetic poles to achieve the ideal effect.
