sourec Commonly used method of small DC motor magnetic tile magnetization:
1, magnetic tiles alone in the magnetic, and then in the chassis, and then gather the whole;
2, magnetic tile in chassis (sticky) and then magnetizing, and then combine the whole;
3, magnetic tile in chassis (sticky), and then combine a good product, and finally overall magnetism.
[Various ways to magnetic tile magnetic effect:]
1, the first magnetic method compared to the second, three types of magnetism remains magnetism less than 10% less, generally, the second magnetic method is more reasonable;
2, ①. The first way is very convenient for magnetism, and solenoid tunnel magnetization, some plants using high production efficiency; ②. The second method is very convenient to produce magnetism, some plants using external impulse, and some used impulses, magnetic tile or magnetic rings need to be stuck well; ③. The third way is magnetism, there are many small motors (mostly three trunks) using this method, the rotor installed in the absence of magnetic power is well integrated, but it is not convenient to check whether the magnet is completely charged.
3, ①. Magnetic magnetism magnetism When there is no external magnetic field, the first magnetic system is contained in the open magnetic field, because the magnetic circle is magnetized, a closed loop is not formed, the magnetic tile magnetism is difficult to fully charge, the magnetic flux density of magnetic effect, the general ratio closed - Circuit magnetism will be less; ②. The second magnetization method is used most, related to closed-circuit magnetism, the magnetic flux concentration can be adjusted by the maximum concentration, and the air gap can be adjusted by filling the size of the density, to meet the requirements of the waveform performance, but motor assembly, special tolling assembly needs to be used, or Magnetic ball gouge rotter or magnetic tile magnetic fr Yagamentesana reason may be due; ③. Third magnetism also involves closed-circuit magnetism (which is a good magnetic element in the rotor punching), after magnetization, the magnetic flux concentration is usually in the first and second, note: it is better to open the carbon brush and the rotor windings, or carbon brush and the Commander's contact surface in the ignition phenomenon Can produce.
Currently, to extend permanent magnet service life, taking protective measures whip, electroless plating, chemical conversion coating, electrophoresis and spraying are done. Among them, electroplating and electroless enamel are the more common methods. However, there is some difficulty in plugging the Nd-Fe-B magnet surface. The main problem is the NdFeB magnet coating: NdFeB Nd will easily adhere to oxidized, incomplete pretreatment reduction coating; NdFeB magnet powder is formed from a rough surface of sintering and plate has a large number of pores, plating the pan points in the penetration of alkali and electroplating solution and covering the chest, and even the cause of corrosion and layer; Due to the uneven surface microstructure of the magnet, planting porosity may increase, reduce protective cover. To respond to this problem, to ensure the coat and anti-corrosion performance ties, we will have to select the correct pre-treatment process.Should not, patented metallic materials.
According to the characteristics of the material, NdFeB surface treatment is seen to be very different, which is difficult to the layer, which determines NdFeB compared to normal metal matter, if NdFeB does not work for the treatment of hardware ideas and surface treatment methods.
1.2 In case of loss and analysis, nodium iron boron material [1]
The element's specialty determines that NDFEB is extremely sensitive for oxygen during use. Performance corrosion product for bubbles, rust point, blasting, distortion etc. causes analysis, internal and external reasons
1.2.1 Internal reasons
(1) the difference between the different elements of the material;
(2) Non-uniformity among the elements at each stage;
(3) the difference between different parts of the material caused by different grain sizes;
(4) porous and complex structure;
(5) Defects in the material
1.2.2 External factors
Mainly penetrating the penetration of friction in the outer world, so that the layer layer was corroded or corrosion coating and then the level of the sub-soil erosion. In the final analysis all kinds of oxidation, see the decay of the producer from the electrochemic point; From oxidative germs, belong to intergranular corrosion.
1.3 Neodymium relation between iron boron material and surface treatment [1]
The material is on the basis of surface treatment. In the process of making the material, the parametric properties of the parameter should not be considered as a good basis for the treatment of the next surface treatment, but will give special attention to the external processors of adverse effects in adverse effects. Therefore, in order to improve the quality of coating, the first particle-size distribution of the material must be understood in the element, weight loss, density, oxygen content, surface area, energy product, correvity, powder. Plating
(1) When heavy weight loss products, the PCT test is prone to bubble bubbles phenomenon when the casing is fully exploded, the underlying complete powders.
(2) The products with low density flow hydrogen to the evolution and the holes create conditions for the remaining objects. Coating surface is rough and porosity is increased, which affects coating resistance to corrosion. Large area products for the reduction of the difference between the edge and the central density
(3) Products with large oxygen content are highly sensitive to storage, chambering, degree, fragments, wet and other corrosive environments. The product of the plated page has such flaws as adversely affecting coating corrosion resistance and porosity.
(4) high hardness and intensity show with high strength and force ball. When carrying, chamfering, the whip convergence electrolyte process occurs. The phenomenon of Stomata and Blister will increase, and the material is very vivid. Easily oxidized, covering more difficulties. (5) Powder uneven distribution, frequent crystallization of dense goods, tendency to attract extra in weak places, and even local small cracks.
(6) Surface remanence products, theoretical or functional cover analysis is not good either.