Rewinding a Thorens TT motor - diyAudio
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Old 1st March 2013, 02:44 AM   #1
nezbleu is offline nezbleu  Canada
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Default Rewinding a Thorens TT motor

So I have an old (Mk I) Thorens TD 160. The motor does not turn, and both windings measure open. There are some replacement motors available on that auction site, and possibly elsewhere, but they tend to ask "collector" prices, and this is a DIY site, so I like the idea of fixing it.

I have disassembled the motor, and I was hoping for an obvious (and easily repairable) fault, like on this page. However, I can't see the open, and my clumsy poking around has broken both ends of one winding in such a way that I despair of fixing it. (The wire was much more brittle than I expected.)

So I'm thinking it would be cool to strip the old wire off the bobbins and re-wind them with new wire. However, I've never wound anything more complex than a fly reel. Has anyone here ever tried to re-wind an AC synchronous motor for a turntable? Any idea what size of magnet wire I need or where I could get it? I assume I need the same number of windings, and figuring out how many that is seems rather daunting. I assume there are tools that make it easier, but I also assume I can't afford them or they at least cost more than a new motor. It also occurs to me that this is an opportunity to maybe make the motor a little better. For example, a slightly thicker wire, if it would fit on the bobbin, might run cooler and be less prone to failing in the future (although the deck was made in 1975, so I really can't complain about longevity). I assume that would also lower the resistance of the coils, so would need a different value capacitor (there is a 0.33uF cap that is supposed to cause a 90 degree phase delay in coil vs the other coil).

Of course I am completely getting ahead of myself... I am asking if anyone here has any experience, tips, or advice for something like this. For that matter, are there likely to be electric motor repair shops that would touch a motor this small?

Thanks in advance for any help or ideas.
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Old 1st March 2013, 02:51 AM   #2
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Article pending.......
I'm in contact with a guy who has done similar to what you wish on a TD160 motor. (16 pole AC synchronous 120 vac motor) He had to design and build his own coil rewinding lathe (modified motor). I have a few photos already, but he has promised an article detailing his process. When I have the article, I'll post it on my website (The Analog Dept) and also post a thread on this forum.

To spoil the story, his project was successful. He had a broken coil. Now he doesn't and the motor has been running for a week or so without any drama. More to come. I'll post a link to this site when I have everything up.

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Old 1st March 2013, 03:21 AM   #3
nezbleu is offline nezbleu  Canada
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Sounds awesome! I look forward to the article, although I also doubt I will be able to replicate the work (there is nothing "lathe-like" in my house).
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Old 1st March 2013, 01:25 PM   #4
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At least over here a few elderly masters remained in the business running "motor renovation" service... They rewind broken coffee grinders, hoovers, it shouldn't be an issue to fix more delicate things. I still have a broken MW oven table motor to have rewound... Luckily, my TD160S works well
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Old 2nd March 2013, 10:52 AM   #5
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I think it is very difficult rewinding such a motor because the wire is very very thin.
I had the case with a NAD turntable, the diameter of the wire is 0.02 mm and there are thousands of turns for the 220 V we have in France.
It needs professionnal tools to rewind it.
But there is another solution, it is possible to rewind hundreds of wire of 0.1 mm diameter. Next you need only to use a transformer to reduce the voltage applied to your new windings.
Quite the same thing that is done with some later mk2 Thorens turntables.
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Old 5th March 2013, 01:07 PM   #6
genel is offline genel  United States
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Default well

Why not take the motor to a pro?

There are places that rewind/repair motors, and there might be one in your area. If anything, they could probably give you some advice.
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Old 5th March 2013, 08:59 PM   #7
nezbleu is offline nezbleu  Canada
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Yes, I probably should, although it seems like most motor-repair places mostly work on larger motors. I was just thinking it might be interesting to try to rebuild it myself. The motor is already dead, so worst case I waste some time and the price of a spool of very fine magnet wire.
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