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> a.c. psu for papst motor
kevchard
  Posted: June 01, 2006 08:11 pm
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Hi to everyone.
I have a Michell turntable with a broken a.c. power supply (19Va.c. 3 wire).
I am looking to make a non elaborate psu as a temporary measure (until i can afford a d.c. motor and controller upgrade).
The motor has the markings PAPST 901 3520 001, HZ 20.35-4-232 EeM-B112, 24V 50Hz 22uF 10-97
The motor has 4 wires going to it. yellow and green are joined together (connected on same terminal of an on-off switch, with a single wire on other terminal of the switch going to power supply), brown wire (goes to power supply) and blue wire (goes to power supply).
Someone has suggested that 2 wires off the secondary of a transformer feed 2 of the motor wires, then a capacitor is linked in series from one of the secondary wires to the remaining wire on the motor (does this sound correct?).
How could i work out the value of the cap to feed the motor? How would i know which wire goes to which colour wire on the motor?
Thanks for your time.
Cheers
Kevin
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govjohn
Posted: June 01, 2006 11:21 pm
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Yes that would work. The yellow and green wires go to one side of the transformer and the capacitor is connected between the blue and brown wires. The other side of the transformer, goes to whichever end of the capacitor makes the motor go round the right way. Although the motor is rated at 24V it may be best to run it at a reduced voltge to keep the noise down. This is probably why the original PSU was rated at 19V. The capacitor should be 22F as stated on the motor and this may present problems as it must not be an electrolytic type (specialised electrolytic capacitors are sometimes used as start capacitors on split phase motors, but never as run capacitors). If the original capacitor is available use this (dig it out of the old power supply) otherwise, suitable capacitors are available as motor run capacitors, but as these will be for mains voltages they will be larger, physicaly, than nessesary. Good luck John.
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kevchard
Posted: June 02, 2006 08:10 am
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Thanks John
The trouble is the power supply i have is a bit more sophisticated (and approx 400 when new). The supply is one of those crystall oscillated 50Hz generating jobs, so the design is no where near straight forward for a person like me to understand sad.gif.
I will look in maplin, rs and farnell for a suitable capacitor and get back with my findings.
Thankyou for your help smile.gif.
Cheers
Kevin
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kevchard
Posted: June 02, 2006 06:18 pm
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Hi
I have found a 440v 20uF 'run' cap.
Would a non polarised cap (eg reversolytic) do?
What effect would less capacitance have? What effect would 440V cap have?
Cheers
Kevin
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govjohn
Posted: June 03, 2006 12:08 am
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The 440V 20F run capacitor should be OK. The capacitor is used to get a 90 degre phase shift between the current in the two motor windings. If its more or less than 90 degres it will affect the smoothness of the motor, although if yours is one of the PAPST external rotor motors it probably wont matter. The fact that its 440V will have no effect. Your original PSU sounds like a crystal controlled sine wave oscillator driving an audio amplifier and should not be too hard to fix, certanly for a lot less than 400. Can you get the circuit? John.
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kevchard
Posted: June 03, 2006 09:16 am
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Hi John
The PSU is for a Michell Gyrodec. The PSU is called a QC supply. It was bespoke for the Gyrodec and Orbe turntable, so i doubt the designs are in the public domain.
The problem is with the 33 / 45 rpm speed swiitch. The QC fell off a shelf and landed on the switch, so it snapped internally. I had one hell of a job removing the old one as it was a 2 sided cct board.
I got the old one off but a couple of the tracks went for a burton (so i lined them with wire instead).
The switch is a 4 pole latching one (2 rows of 6 terminals, 0.1" pitch).
There is a red/green led which denotes 33/45 rpm, this still orks fine, but there is no voltage on the output now tho sad.gif.
Would you consider for a fee, looking at the psu in lieu to fixing it?
Kind Regards
Kevin
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govjohn
Posted: June 07, 2006 08:27 pm
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I would be happy to fix your PSU for you. I used to do this for a living, but the bottom has dropped out of the market due to cheap imported goods and a general reluctance to have stuff repaired. I now mainly repair good quality audio gear, usually sent by post or courior, as I live in a a remote part of the country (west Welsh coast). As to how to contact me, I am reluctant to put my E-mail address on the public domain, so give me a call on 01239 614282 and ask for John Lawrence and we'll go on from there. John.
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kevchard
Posted: June 07, 2006 08:49 pm
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Thanks John biggrin.gif
I will be in touch shortly. Is there a good / bad time to contact you?
Kind Regards

Kevin
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govjohn
Posted: June 07, 2006 10:28 pm
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Anytime up to about11:30PM. John.
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kevchard
Posted: June 24, 2006 08:48 pm
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Hi John
Thankyou for everything. The PSU is working fine now. It is a joy to hear wish you were here on vinyl again.
My moving coil head amp is broke now (pegsus transistor thing), but the dynaco pas-2x preamp seems to have enough gain to cope.
I can't thank you enough for your quick, efficient and friendly service.
I have 2 spare pas-2x pre amps so i may start fiddling with them soon, i want to take out all the unnecessary ccts (eg scratch filter, bass/treble and blend control).
Trouble is too many hobbies, not enough free time (trying to build a car in my spare time).
Cheers and you will be my first repair company in future.
Kind Regards
Kevin and gyrodec biggrin.gif
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gyrojoe
Posted: April 27, 2018 01:23 pm
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Greetings from a newbie,
Resurrecting this old thread- I have a Michell Gyrodec that I am restoring. It needs a power supply.
The motor spins freely. Its designation is

Papst 9013520001
Has 20.35-4-232 Ecm-B112
24v 50hz 22mF Sept 82.ll


Any suggested power supply design help would greatly appreciated.
Or if you would be interested in building one, PLMK. I can ship it from FL USA.
Thanks.
Joe
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