AC sync motor control

3GGG · 01:28 AM

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.

SGregory · 27th July 2010, 02:04 AM

You want to sell one? Very nice work.

c0redumpt · 31st July 2010, 05:52 AM

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

analog_sa · 31st July 2010, 08:33 AM

Quote:

Originally Posted by 3GGG

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?

3GGG · 31st July 2010, 12:03 PM

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.

AndrewT · 4th August 2010, 10:36 AM

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.

3GGG · 4th August 2010, 11:20 AM

Yep, sure is two 3886 locations for 90 deg. offset

Andrew, havent looked at the motor in too much detail atm.

runethechamp · 4th August 2010, 04:46 PM

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.

indianajo · 4th August 2010, 05:48 PM

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.

alexcount · 3rd December 2010, 08:21 AM

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.

27th July 2010, 02:04 AM	#2
SGregory Tubie Noobie diyAudio Member Join Date: Apr 2003 Location: Southern Tier NY	You want to sell one? Very nice work. __________________ Living Life Doing the Waltz in 4/4 meter.

4th August 2010, 10:36 AM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

4th August 2010, 05:48 PM	#9
indianajo diyAudio Member Join Date: Jan 2010 Location: Jeffersonville, Indiana USA	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. __________________ Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,SP2-XT's, T-300 HF Projs, Steinway console, Herald RA88a mixer, Wurlitzer 4500

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31st July 2010, 05:52 AM	#3
c0redumpt diyAudio Member Join Date: Aug 2005	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

31st July 2010, 12:03 PM	#5
3GGG diyAudio Member Join Date: Mar 2010	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.

4th August 2010, 11:20 AM	#7
3GGG diyAudio Member Join Date: Mar 2010	Yep, sure is two 3886 locations for 90 deg. offset Andrew, havent looked at the motor in too much detail atm.

4th August 2010, 04:46 PM	#8
runethechamp diyAudio Member Join Date: Mar 2009	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.

3rd December 2010, 08:21 AM	#10
alexcount diyAudio Member Join Date: Oct 2004 Location: NYC	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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