Why are amorphous alloy dry type transformers noisy?
Due to the larger magnetostriction of the amorphous alloy iron core than that of the conventional silicon steel sheet, its vibration noise is larger than that of the conventional silicon steel sheet transformer. For every 0.02T increase in magnetic density, the noise of the product increases by about 1dB. Under the same conditions, the no-load loss and excitation power of the 15-piece group of lapped amorphous alloy dry type transformers can be reduced by 5 to 8% compared with a group of 30-piece in-line lapped amorphous alloy dry type transformers, and the average noise of the finished product can be reduced by about 2dB.
Why are amorphous amorphous alloy dry type transformers noisy?
Methods of reducing the noise of amorphous alloy dry-type transformers:
Silicone rubber sheets are used to fill around the clip and the iron core to reduce vibration and noise.
After installing the vibration reduction mounting base, the noise energy of the amorphous alloy dry-type transformer will be lower than 1 ~ 3dB, which has a good noise reduction effect.
Optimize the assembly process to reduce noise:
1) The amorphous alloy iron core should be handled with care during transportation and transfer to avoid stress and brittle cracking of the iron core. After unpacking the iron core, the iron core should be hoisted to the pushing table. Use a brush to apply some transformers on the side of the joint of the iron core. The oil penetrates into the seams of the iron core pieces, which can play the role of bonding the iron core pieces together. The toughness of the iron core pieces after bonding together is enhanced, which is convenient for the opening operation.
Amorphous alloy dry-type transformer, amorphous alloy transformer noise
2) Use a magnetic hoist to hoist the amorphous alloy iron core on the push table, open the seam of the iron core pieces, and use a protective cardboard to protect the iron core after opening, so as to avoid pushing the iron core into the coil and collect the openings. Fragments of the iron core scattered for a while.
3) The high and low voltage coils are first placed on the assembly table through the tooling positioning and installation kit. The three-phase coils should be aligned horizontally, and the positions of the high and low voltage coils should be aligned. Silicon rubber strips, epoxy boards, etc. are used for support and positioning between the coils.
4) After the high and low voltage coils are positioned on the assembly table and the iron core is positioned on the push-in table, the iron core can be pushed into the coil. The three-phase five-column amorphous alloy dry-type transformer has a four-frame five-column structure, and the four-frame iron cores are independent Push in, but pay special attention to the height of the two adjacent frames during the push-in process, and they should be level and close together. The gap between the iron core and the coil should be sieved into the silicone rubber strip and the epoxy plate to make it compact. For large-capacity products, the cross-section of the iron core is large, and two-layer iron cores are often stacked. The lower iron core should be pushed and installed first, aligned and tightened, and then the upper iron core should be pushed and installed after sealing the seam.
5) After the iron core is pushed into the coil and in place, assemble the spacer block and the epoxy support plate, and then carry out the iron core seam encapsulation. The iron core seam encapsulation is to put the opened seam back at the seam position before opening, and use silicon Ketone sealant seals the sides of the seam, and finally uses silicon steel sheets to seal the core as a whole. During the packaging process, special attention should be paid to the seam method to avoid damage to the amorphous alloy strip and ensure that the seam is in place.
6) After the iron core is encapsulated, the clips are assembled in place, and the amorphous alloy iron core is encapsulated as a whole, mainly through the clips and spacers, and the supporting epoxy board is stressed, so as to complete the overall assembly of the body.
7) After the whole body is assembled, hoist the transformer as a whole to the turning table, and after the binding is firm, the whole body can be turned up and up for further factory attachment assembly.
