I bought 2 of these through a well-known classifieds site, of course there are no guarantees from outbids, but both fans were in their original packaging with seals. One of the fans quickly found a jamb - when turning in one of the extreme positions, some kind of rattle and vibration appeared. Since there is still no guarantee - I dismantled the platform, it became obvious that the problem was in the synchronous motor with the proud sticker KSW wyj50-8a1 (pictured), apparently the marriage was caught. Having removed the dimensions and searched on the Internet, I realized that in China there are a lot of engines with such dimensions, but with a different spindle, including the right one (I added the dimensions and type of the spindle in the photo, suddenly someone will come in handy). The cost of the engine is 170-300, depending on the seller. I have already ordered and am waiting for it to arrive to change. In fact, the fan is really cool, I bought it for 11500 apiece and it's worth the money, if only there was a normal guarantee that in my case one could be changed or sent for repair - it would be generally excellent, but also quite repairable equipment on its own.
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