Love creating hifi equipment
Joined 2023
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I made this turntable many years ago and I decorated it with lights to look like this. Do you have a friend you like?
Love creating hifi equipment
Joined 2023
Paid Member
Love creating hifi equipment
Joined 2023
Paid Member
Are you the one that has that YT video showing the platter going onto the bearing and it spins for like 10 mins?
Love creating hifi equipment
Joined 2023
Paid Member
what type of motor will best for driving/turning these types of bearings? Low torque since the bearing spins for a long time freely?
You don't need a lot of torque when the platter is up to speed, but with a really low torque motor you may need to help the platter get up to speed manually. Generally the reason for a low torque motor is to reduce motor noise and vibration to an absolute minimum. Any AC motor with permanent magnets in its construction will have some vibration, although multiphase motors tend to be better. With DC motors the smoothest type has an 'ironless' rotor, but DC motors tend to suffer from longer term speed drift, though this can be eliminated by the use of a feedback loop.
My personal favourite is the Papst synchronous Außenläufer motor, driven by a 3 phase supply. When driven like this there is effectively zero vibration, and the external rotor provides a high moment of inertia.
My personal favourite is the Papst synchronous Außenläufer motor, driven by a 3 phase supply. When driven like this there is effectively zero vibration, and the external rotor provides a high moment of inertia.
Sadly Papst stopped making these motors quite a few years ago, though they do appear on online auction sites. You also need to be aware that not all motors of this type are synchronous (look for one whose part number starts with 901).
I heard of very good motors mass-produced for VHS videos. I dont remember if they were in Philips or Japanese drives. Got 5 different machines for free that I intend to pull the motors from and identify them.
Cheese!
Cheese!
Love creating hifi equipment
Joined 2023
Paid Member
Im still researching Im guess motors from the midd 90ies were of the highest quality. I dont even know if its the motors from video head, drive or eject mechanism which are good for turntables😄
Cheers!
Cheers!
HI,
!5 years ago when I made my second DIY TT I used a 5 Inch floppy disk motor taken from an old PC, they are brushless type, pretti silent if bearing still ok and have great torque as well. To improve then you may replace the bearing with a bronze bush. They have a good electronic speed control as well. Pity now not so easy to find them. My TT platter is about 5,5 Kg including the puc and reach the set speed well, have a torque higher than a Lenco L75, I use 3 belts to drive the platter , but also with one belt is running very well. Motor is separated from the plinth.
Rgds
Adelmo
Love creating hifi equipment
Joined 2023
Paid Member