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Old 27th July 2010, 01:27 AM   #1
3GGG is offline 3GGG  Australia
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Default AC sync motor control

My slate and acrylic TT is nearing completion. I decided that an AC sync motor seemed the best solution, but wasnt aware how complex they could be to control.

My brother said he would work something out for me and a few week later came back with the following. Just waiting on a few parts for Mouser and he needs to finish writing the software.

You can adjust voltage and frequancy and it has a boost feature to get the big platter going.
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Last edited by 3GGG; 27th July 2010 at 01:28 AM. Reason: cant spell
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Old 27th July 2010, 02:04 AM   #2
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You want to sell one? Very nice work.
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Old 31st July 2010, 05:52 AM   #3
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Looks very impressive.... once all setup you should have a mighty fine high-level turntable in action

Look forward to seeing and hearing it action in the near future mate
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Old 31st July 2010, 08:33 AM   #4
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Quote:
Originally Posted by 3GGG View Post
You can adjust voltage and frequancy
It is easy and useful to also include angle. Obviously you have chosen a low voltage motor. Which one?
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Old 31st July 2010, 12:03 PM   #5
3GGG is offline 3GGG  Australia
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Thanks Guys,
None for sale as yet, will get mine going first then look in to it.
Motor is a berger lair 350 rpm @ 60hz so should suit finr. If it is no good I like the look of the hurst motors, plenty of options there.
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Old 4th August 2010, 10:36 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
I see two 3886 locations.
Are they for 90degree phase difference for the synchronous motor inputs?

How does the motor do 350rpm from 60Hz? That would be a 10.28pole motor.
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Old 4th August 2010, 11:20 AM   #7
3GGG is offline 3GGG  Australia
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Yep, sure is two 3886 locations for 90 deg. offset

Andrew, havent looked at the motor in too much detail atm.
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Old 4th August 2010, 04:46 PM   #8
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If you had manual switch between 33 and 45 rpm, all you would need is a couple of capacitors plus a couple of resistors if you used a low voltage motor. Now of course you get a lot more flexibility and control of the speed, but a stable hook-up of a synchro motor can be very simple.
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Old 4th August 2010, 05:48 PM   #9
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Don't want to denigrate an energetic DIY effort, but variable speed soft start single phase motor drives are now a component. Search NXF25 at newark.com for a Cutler Hammer 1/3 hp drive for about $140. Hammond organs drive the second phase of the synchronous motor with a 3 uf run capacitor. I have been eyeing one to add varispeed to my H182 organ celeste vibrato, a la improving the imitation leslie effect with the stereo vibrato to have the fast-slow ramp up and down feature. However, I have a surplus old tech 1 phase drive I'll probably use instead.
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Old 3rd December 2010, 08:21 AM   #10
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How is this project coming along? I am very interested, as all of us are, please keep us posted. I want to see this done.
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