Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Help wanted:  motor stuck when powered
Help wanted:  motor stuck when powered
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 21st May 2019, 12:09 AM   #71
ralphfcooke is offline ralphfcooke  United Kingdom
diyAudio Member
Join Date: Jun 2007
Originally Posted by sq225917 View Post
Turntable AC motors are pretty much free running once up to speed and as a result cogging becomes more pronounced. Add a little consistent load, thicker oil or eddy brake and the cogging is reduced. It's a genuine free lunch as long as you don't over do it.
I think that only applies to motors with permanent magnet pole pieces. Hysteresis motors, at least the Papst ones I'm familiar with, and I believe also the Ashland, Bodine, and others of that type, are less efficient, but do not suffer from cogging.
  Reply With Quote
Old 21st May 2019, 01:52 AM   #72
jneutron is offline jneutron  United States
diyAudio Member
jneutron's Avatar
Join Date: Jan 2004
Location: Long Island NY
What can be learned about motors and how they react both loaded and unloaded is huge.
I have found very little on how the magnetics react in a non linear fashion to load. The entire motion control industry seems to flounder when the rubber meets the road. I am working on that..

I hate all these smart gadgets..I refuse to buy things that are smarter than me. I've made a list of those things... Cabbage just made the list.
  Reply With Quote
Old 21st May 2019, 04:40 AM   #73
PRR is online now PRR  United States
diyAudio Member
PRR's Avatar
Join Date: Jun 2003
Location: Maine USA
Originally Posted by kevinkr View Post
..My neighborhood has 3 phase at ~23kV I no longer remember if it is wye or delta...(For some reason I think it might be grounded Delta, but who knows..)
Or cares. You get three hot wires and often a ground/neutral wire at your building service entrance. How they wrap around the street transformer is not your concern.

BTW: they often alternate wYe and Delta at each step-down to cancel stray currents.

I am startled, not shocked, that Center Philly still has 2-phase. Naturally residences would be fed 1-ph 230V CT from the pole/vault transformers.

No, they'd never supply 4KV to anybody who didn't have their own transformers or some HUGE motors.
  Reply With Quote
Old 21st May 2019, 01:25 PM   #74
Kay Pirinha is offline Kay Pirinha  Germany
diyAudio Member
Kay Pirinha's Avatar
Join Date: Oct 2011
Location: Somewhere in Germany
Originally Posted by banpuku View Post
SUCCESS!!! She's running. OK, I re-assembled the bottom bushing components and I changed the order of 2 of the components. The "star" should go on top of the "small ufo disc". Then the larger UGO disc goes on top of the "star". Forgive me in advance as I do not know the correct names for these parts. Here is the proper order of assembly starting from the bottom going to the top:

1. bronze bushing
2. felt oil ring
3. small UFO disc
4. star stabilizer
5. large UFO disc

See photos. I had #3 and #4 reversed order. This allowed the bronze bushing to move freely. Once the assembly order was correct, the bronze bushing was locked into place and thus kept the motor shaft in it's place.

THANK YOU! for all who contributed on this journey. I hope this thread helps out someone else in the future. I am so happy!

Well, that's exactly what I've suspected yet in #2 !

Best regards!
"Bless you, Sister. May all your sons be bishops." (Brendan Behan)
  Reply With Quote
Old 21st May 2019, 04:53 PM   #75
Galu is offline Galu  Scotland
diyAudio Member
Join Date: Apr 2018
Originally Posted by Kay Pirinha View Post
Well, that's exactly what I've suspected yet in #2 !
In retrospect, we now know that Pat answered your question with unjustifiable confidence.

Let's remind him gently, in the spirit of camaraderie, how he answered your question!

Originally Posted by banpuku >
I am very confident the motor stator is in the correct direction. Washers are OK as well.
  Reply With Quote
Old 21st May 2019, 05:40 PM   #76
nezbleu is offline nezbleu  Canada
diyAudio Member
nezbleu's Avatar
Join Date: Dec 2009
Location: Halifax, Nova Scotia, Canada
Originally Posted by jan.didden View Post
There's a nice way to minimize vibration from the motor but you need a spectrum analyzer and a vibration pickup like a small accelerometer sensor.
Originally Posted by Galu View Post
The motor’s vibration will be transmitted to the record, contributing to turntable “rumble”.

Luckily most turntables have a built-in vibration sensor (aka "phono cartridge"), and spectrum analyzers are free software, just hook up to a sound card.

I have been thinking that something like a small tin can inverted on the TT plinth, with the stylus resting on the end of the tin, would make a decent way to pick up motor vibrations without rumble from the platter rotation mixed in (much). I haven't tried it yet.
"In the world of commerce and finance it is thought quite remarkable if a man is both clever and honest." -- Demosthenes
  Reply With Quote


Help wanted:  motor stuck when poweredHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
WANTED Roksan Radius 5.2 Motor or Motor Spindle kornhead Swap Meet 0 6th October 2018 11:36 AM
Compact Disc Motor and Turntable - Advices for Replace and Motor Service wanted tiefbassuebertr Digital Source 8 21st September 2018 04:39 PM
Single Phase Power Source (AC Regenerator) for Induction Motor Powered Turntables kevinkr Analogue Source 68 17th September 2015 08:43 AM
WANTED: Thorens TD 160 motor!!! javisaxonjr Analogue Source 9 10th December 2014 08:27 AM
Turntable motor wanted lassipr Parts 1 24th March 2010 09:16 PM

New To Site? Need Help?

All times are GMT. The time now is 03:38 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio