EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: TerraHertz on December 13, 2020, 07:01:59 am
-
https://www.youtube.com/watch?v=bsS_7EEYx1Y (https://www.youtube.com/watch?v=bsS_7EEYx1Y)
47 minues. 3.5M views. Worth it.
-
Bloody Hell.
Why didn't they just get a new one from China? Oh, wait.
There was no mechanical load attached to test it after the rebuild?
I hope someone got some beer money from all that copper that was salvaged.
-
Yep, these kind of videos always interesting to watch.
Labor cost $12 for these job ... and no copper (minimal) was wasted.
https://www.youtube.com/watch?v=SqpD4khzqbw (https://www.youtube.com/watch?v=SqpD4khzqbw)
A 25 KW DC armature rewinding job ..
https://www.youtube.com/watch?v=dLoDMMP1pPk (https://www.youtube.com/watch?v=dLoDMMP1pPk)
-
Bloody Hell.
Why didn't they just get a new one from China? Oh, wait.
There was no mechanical load attached to test it after the rebuild?
I hope someone got some beer money from all that copper that was salvaged.
Watch my prev. post, its $12 job, don't believe new one even the cheapest from China can replace that.
A $12 at certain part of the world can feed the whole family for days.
-
Rewinding is done professionally everywhere in the world, first-world countries included. It's very common, even my fairly small ex home town of 200k people had countless of rewind shops.
Obviously, in higher-pay countries, you won't rewind a $200 motor identically just to repair it, but you may rewind a $10000 motor for repair (costing significantly less than the price of the motor), or you may need to create special windings for special voltage requirements.
For large or special motors, winding at the winding shop is the same semi-automated, mostly by hand process as originally done at the factory, so it'll end up being cheaper than full replacement because a lot of the work (everything else except windings) has been already done.
For small mass market motors, they are wound by highly automated machines and it's obviously cheaper just to replace the whole motor. In third-world countries with cheap labor, rewinding them may still make sense, and I see this only being good (for environment, and the people can make living with it!)
-
Its just sometimes, watching these videos, when they did the big power motor like the 2nd video above, its cringe worthy to watch the workers when testing the new winded 25 kW DC motor, using an exposed variac :o , and then exposed big diodes :o to rectify the AC, and others like not wearing eyes protection and etc, for me, personally that is quite scary. :scared:
-
... and just for giggle the comparison ...
https://www.youtube.com/watch?v=uWBEPEspbWI (https://www.youtube.com/watch?v=uWBEPEspbWI)
-
... and just for giggle the comparison ...
Care to lay odds on which motors will still be providing satisfactory service in decades to come? :D
Seriously though, aside from the dangers of toxic dust, chemical hazards and risk of physical injury (and electrocution on that 25kW one!), those guys are are serious craftsmen. It's impressive to see what they are achieving with absolutely minimal, largely hand made tools.
The guys on the Audi line, by contrast, seem to work in the same slow motion as many of the handling machines (which seem to do quite a lot of unnecessary pirouetting). They seem to be relegated to doing the bits that would be awkward for the robots to do, not displaying any particular skills, apart from maybe the inspectors - although door gaps could probably be done better with laser scanning.
-
Was that guy using a yard stick? :o
Well..not a yard, pretty sure I saw 40 on it. But unless their hands are... about 2.5 times smaller than mine, those sure looked like inches. Putting the whole ruler a tiny bit over a meter.
I guess whatever you find in the scrap bin, huh?
Tim
-
Was that guy using a yard stick? :o
Which one ? I think its a bamboo :o, check this one as its more detail at 22:46.
https://www.youtube.com/watch?v=hFPZDd-5SJA (https://www.youtube.com/watch?v=hFPZDd-5SJA)
-
If a spaceship falls on the territory of Pakistan, the guys will repair it and fly into space. :)
-
... and just for giggle the comparison ...
Definitely beautiful, clean, and damn expensive.
But this is also a bit funny: robots are mostly worn, and some huge machine is used to install retainers.
Still, a lot of operations are performed by people.
Maybe, for example, Toyota will laugh at how much manual labor Audi has. And Lamborgini will call it soulless consumer goods from robots.
:)
-
Hi. My dad, rest his soul, spent most of his working life in an electrical shop rewinding motors. Mostly small automotive ones I think. I remember sometimes we had to cancel a trip to the lake because a motor at the local cannery burned out and he had to spend the Sunday rewinding it instead of being with us. I really liked going to the shop where he worked and watching him. That was a very long time ago. Now I am crying, sorry. Thanks for helping me remember this. Cheers.