DC05 - why do replacement motors fail within 2 uses?

[AA958]

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Hi, I have an DC05 Absolute+ .I have replaced the motor in it twice.  After replacing it works brilliantly, better than for a long time. Then on the second use there's a burning smell which gets worse with use until it's unbearable (after just 10mins or so).  On opening up the hoover the filters are black, there's a lot of metallic dust and chips and the brushes in the motor are chipped and the copper blackened in patches.  This has happened 2x now with Quаltex motors.  The correct motors were purchased (as two options for this model) and they were wired as per original motors (I took a photo).  I can't find fault with my reassembly. I got no joy from supplier other than a suspiciously AI-like response offering me a replacement which I used and it also failed in the same way.  All components had been thoroughly cleaned.  I must be doing something wrong and would love to get some advice on what so I can use it and fix my mothers which also needs motor replacing. I have 1 motor left to try! Be 50 odd quid down drain if it also fails.  Thanks, A

[MVacs]

This has happened 2x now with Quаltex motors. 

We very seldom source from them anymore. Their motors aren't what they were. If you have bought from eBay or Amazon from them, I'd expect AI-type replies as they do a lot of volume and it's probably not cost-effective to pay people to answer the questions.

It's really hard to find good YDK-type Dyson motors at the moment. They have suffered a race to the bottom on pricing by all the big suppliers, and that means quality has taken a hit. As the machines are getting older, and people don't want to pay a lot for a motor, nobody will invest in better ones.

If we do a refurbished Dyson cylinder, I'd rather put a good used genuine one in than an aftermarket new one.