Why don t you use pure iron sheets for the material of the stator core?

Hello: Silicon steel sheets used in motors and transformersHigh permeability, while the permeability of pure iron sheet is much worse, the heat is larger, and it is easy to burn out.

It is not uncommon for the motor core to be counterfeited and adulterated with black iron sheets, but with the increase of the crackdown, it has been restricted.

Assembling the platform. Technical Requirements:

1. The working surface of the assembly platform shall not have defects such as sand holes, porosity, cracks, slag inclusions, shrinkage porosity, scratches, bruises, rust spots and other defects that seriously affect the appearance and performance of the assembly platform.

2. The casting surface of the assembly plate should be cleared of molding sand and smooth, and the paint should be firm.

3. On the working surface of the flat plate with an accuracy registered as grade 0-3, the sand hole with a diameter of less than 15mm is allowed to be plugged with the same material, and its hardness should be less than the hardness of the surrounding material. There should be no more than 4 sand holes blocked on the working face, and the spacing between the sand holes should not be less than 80mm.

4. The assembly plate should be made of high-quality and fine gray cast iron or alloy and other materials, and the hardness of its working surface should be 170-220HB.

5. The working surface of the assembly plate should usually be scraped by scraping process. For the 3-grade flat working surface with scraping processing, the maximum allowable value of surface roughness Ra is 5um.

6. The flatness tolerance is specified in Table 2.

7. The assembly platform should be painted and tested by scraping process. The ratio of the contact point area displayed after the study is specified in Table 3: or the number of contact points according to the square area of 25mm 25mm is specified in Table 3, and the number of contact points in any 25mm 25mm should not be greater than 5 points.

The stator core is used as part of the magnetic circuit of the motor and to place the stator windings. In order to reduce the eddy current and hysteresis loss caused by the alternating magnetic potential in the core, the core material is made of 0 5mm thick silicon steel sheets. For small and medium-sized motors with an outer diameter of less than 1m, the steel sheet is a circular punching piece; When the outer diameter is greater than 1m, it is assembled into a circle with a fan-shaped punch; For motors larger than 10kw, both sides of the punching sheet should be coated with insulating paint to reduce core loss.

In order to improve the cooling effect between the cores, medium and large motors have radial ventilation grooves every 40 50 mm along the axial direction.

The inner circle of the stator core is evenly punched out of many grids of the same shape to embed the stator windings. There are three commonly used stator groove shapes: 1) semi-closed groove; 2) Semi-open groove; 3) Open groove.

From the point of view of improving efficiency and power factor, a semi-closed groove is the best because it reduces the air-gap magnetoresistance, so that the excitation current required to generate a certain amount of rotational magnetic potential is minimal. However, the insulation and wire embedding process of the winding is more complicated, so it is only used in low-voltage small and medium-sized asynchronous motors. For medium-sized asynchronous motors below 500V, semi-open slots are usually used.

For high-voltage medium-sized and large-scale asynchronous machines, open slots are generally used to facilitate wire embedding.

Hello dear, the appearance of the stator core should pay attention to these problems: 1. Check the external quality of the core punch, check the thickness of the inner and outer circles of the single punch of each box of iron core punching, and the core punch should be clean, non-destructive and smooth, and the paint film is intact. For the punching pieces with missing corners, hard bending punching teeth or tooth root fractures, tooth grooves, wedges, and sharp corners curling, they should be picked out for treatment or scrapped, and the punching pieces with surface insulating paint falling off should not be used.

2. Check and adjust the round frame, so that the installation of the center round frame should meet the following requirements of the type a, the round frame is installed in the position, and its base should be reliably fixed, and the support platform of the construction operation platform and the center round frame should be separated, and the support platform of the center round frame can not bear the external force in the construction in the whole construction process. B, the structure of the measuring round frame should be reasonable, and there is sufficient stiffness, and has radial and axial adjustment devices.

Stator. There is a brush or.

Brushless motor. The part that does not convey the spine during work. The motor shaft of a hub type brushed or brushless toothless motor is called a stator. Composed.

Coil windings. And.

The stator core has excellent magnetic permeability and plays the role of fixing the coil support.