This is my first post.

[DavidLu]

我發現這個磁鐵的孔位不是方形的。所以噪音和振動很大。可能是組合錯誤造成的

Translation:
I found that the holes for this magnet are not square. So there is a lot of noise and vibration. May be caused by wrong combination

 

[Alaeriel]

Welcome to R2R!

 

[rvitko]

I am not sure what product but this is generally correct, the magnets only mount in one direction correctly, this is an intentional design so the magnets are positioned so the field has the least influence on the pump.

 

[DavidLu]

Like this, these 4 holes are not squares, they are rectangles. If you clean the equipment and install it back, pay attention, this will be the cause of noise and vibration.

 

[rvitko]

Yes, this is a deliberate design, it keeps the magnet holder oriented in such a way that the effect on the rotating magnetic field is minimized, if turned the wrong way, the magnet holder affects the rotation of the impeller and will cause noise. It will only fit properly in the correct orientation.