Hi dears,
I was planning to built a TT with an heavy platter. I have a very good bearing, and I know hot to procede unless that I have to decide for the motor.
I would go for DC motors, I was suggetsed Maxon motors, (which one? and where to buy in Europe?). But I was also told that Maxons are not that exceptional. I heard that there are other motors cheapper and good as the Maxon is. Ok but which one to buy? Where?
I hope someone will help me, many thanks in advance
KEPha
I was planning to built a TT with an heavy platter. I have a very good bearing, and I know hot to procede unless that I have to decide for the motor.
I would go for DC motors, I was suggetsed Maxon motors, (which one? and where to buy in Europe?). But I was also told that Maxons are not that exceptional. I heard that there are other motors cheapper and good as the Maxon is. Ok but which one to buy? Where?
I hope someone will help me, many thanks in advance
KEPha
This one has been swimming around my cranium
As Aquarium rightly says permotec , look for the coreless dc motor for smooth operation !
as for speed control look speed control ic`s from sgs ! the sort used for printers etc. (just put tthis into a search engine)
sorry I dont have the link, I tried to attatch the pdf doccument but this site said the file was to big !
As Aquarium rightly says permotec , look for the coreless dc motor for smooth operation !
as for speed control look speed control ic`s from sgs ! the sort used for printers etc. (just put tthis into a search engine)
sorry I dont have the link, I tried to attatch the pdf doccument but this site said the file was to big !
Re: This one has been swimming around my cranium
Originally posted by Soundadvice
As Aquarium rightly says permotec , look for the coreless dc motor for smooth operation !
So I checked but there is something not clear in the data sheet.
Suppose I look at the CL29-3, so for example the 6V motor of this series should produce a 'nominal speed' of 2680 RPM.
The are two things obscure to me: what 'nominal speed means'?
Second: the speed can be varied from 0 Rpm up tp 2680 RPM varying the applied voltage? Or I need to apply a fixed voltage?
as for speed control look speed control ic`s from sgs ! the sort ?used for printers etc. (just put tthis into a search engine)
I am sorry I am not into this kind of things, I always worked with AC motors, could you exlpain a bit more clear.
sorry I dont have the link, I tried to attatch the pdf doccument but this site said the file was to big !
you could sent it to kephaudio@yahoo.it, I would appreciate very much that, please help me!
KEPha
Originally posted by Soundadvice
As Aquarium rightly says permotec , look for the coreless dc motor for smooth operation !
So I checked but there is something not clear in the data sheet.
Suppose I look at the CL29-3, so for example the 6V motor of this series should produce a 'nominal speed' of 2680 RPM.
The are two things obscure to me: what 'nominal speed means'?
Second: the speed can be varied from 0 Rpm up tp 2680 RPM varying the applied voltage? Or I need to apply a fixed voltage?
as for speed control look speed control ic`s from sgs ! the sort ?used for printers etc. (just put tthis into a search engine)
I am sorry I am not into this kind of things, I always worked with AC motors, could you exlpain a bit more clear.
sorry I dont have the link, I tried to attatch the pdf doccument but this site said the file was to big !
you could sent it to kephaudio@yahoo.it, I would appreciate very much that, please help me!
KEPha
Hi Kepha,
I just finished building me a new motor assembly for my BIX turntable and used a Maxon motor (the exact type is 2140.937-22.112-050). The motor is a 24 V DC type and was recommended for this application by a Maxon representative of the Munich Maxon office (a list of sales offices can be found on their webpage). The motor cost approx. 42 Euros (incl. shipping, VAT etc.).
The reason I exchanged the original BIX motor was that the Premotec motor used in the BIX makes a 'ringing' noise that I could not stop, despite my best efforts using a number of different materials to silence it. Unfortunately the noise was loud enough to be noticeable some 3 meters away from the turntable...
I found a lot of useful information on a German website http://rcswww.urz.tu-dresden.de/~cs838136/krishu/. Unfortunately most of the info on various motors is only available in German (a lot of the other information has been translated to English).
The motor is controlled by a relatively simple DC controller based on the LT1086 (google for this chip, the application is the standard voltage controller).
The stability is very good, I cannot see any speed changes when using a strobe disk and, more important, I can not hear any either. The motor is dead silent (opposite to the Premotec) and fulfills my requirements perfectly.
The motor housing is a piece of stainless steel tube with some lead to make it heavier, the pulley is made from brass.
Best regards,
Andreas
I just finished building me a new motor assembly for my BIX turntable and used a Maxon motor (the exact type is 2140.937-22.112-050). The motor is a 24 V DC type and was recommended for this application by a Maxon representative of the Munich Maxon office (a list of sales offices can be found on their webpage). The motor cost approx. 42 Euros (incl. shipping, VAT etc.).
The reason I exchanged the original BIX motor was that the Premotec motor used in the BIX makes a 'ringing' noise that I could not stop, despite my best efforts using a number of different materials to silence it. Unfortunately the noise was loud enough to be noticeable some 3 meters away from the turntable...
I found a lot of useful information on a German website http://rcswww.urz.tu-dresden.de/~cs838136/krishu/. Unfortunately most of the info on various motors is only available in German (a lot of the other information has been translated to English).
The motor is controlled by a relatively simple DC controller based on the LT1086 (google for this chip, the application is the standard voltage controller).
The stability is very good, I cannot see any speed changes when using a strobe disk and, more important, I can not hear any either. The motor is dead silent (opposite to the Premotec) and fulfills my requirements perfectly.
The motor housing is a piece of stainless steel tube with some lead to make it heavier, the pulley is made from brass.
Best regards,
Andreas
Attachments
KEPH ! it was scanned on the way out !
I haven't got motor problems myself as I use a technics sl1310 mk2!
Yes I am stuck with a generic 70`s S shaped arm , however ,this is made of better materials than the 1200/10 inspite of being the same design. slack the arm bearings a touch ! it sounds livelier !
undoubtedly, a modded rb 250 will better this arm but the timing aspect of this deck (the platter assembly is so much better machined than the 1210 ) leaves rega`s td 160`s linns ( all of which I`ve owned) sound vague and woolly !
belts? the only thing I haven't tried is the origin live mod (permotec coreless) !
get yourself a classic DD trio, denon, technics sl150mk2 (I can afford one but I cant find one) similar or better, w&f due to supply fluctuation ,suspension movement ,stylus drag (this can microscopically stretch a belt and slew suspension) etc. even ambient temp range for goodness sake WILL BE A THING OFF THE PAST !
I haven't got motor problems myself as I use a technics sl1310 mk2!
Yes I am stuck with a generic 70`s S shaped arm , however ,this is made of better materials than the 1200/10 inspite of being the same design. slack the arm bearings a touch ! it sounds livelier !
undoubtedly, a modded rb 250 will better this arm but the timing aspect of this deck (the platter assembly is so much better machined than the 1210 ) leaves rega`s td 160`s linns ( all of which I`ve owned) sound vague and woolly !
belts? the only thing I haven't tried is the origin live mod (permotec coreless) !
get yourself a classic DD trio, denon, technics sl150mk2 (I can afford one but I cant find one) similar or better, w&f due to supply fluctuation ,suspension movement ,stylus drag (this can microscopically stretch a belt and slew suspension) etc. even ambient temp range for goodness sake WILL BE A THING OFF THE PAST !
if you have to use belts..
try a linear servo regulator that uses back e.m.f feedback NOT p.w.m as this puts the noise back in that not using mains a.c. eliminates !
the premotec cl 29 3 W runs upto 24v, I would guesstimate that nominal speed means no load and max voltage !
try a linear servo regulator that uses back e.m.f feedback NOT p.w.m as this puts the noise back in that not using mains a.c. eliminates !
the premotec cl 29 3 W runs upto 24v, I would guesstimate that nominal speed means no load and max voltage !
if you must use belts !
Try a linear servo regulator that uses back e.m.f feedback NOT p.w.m. as this puts the noise back in that not using mains a.c. eliminates !
If you dont want to build one, look through the RS catalouge,but these are on the pricey side and can handle 60w plus (like amp P.S.U`s nothing wrong with a bit of headroom), but have possibilities.
The premotec cl 29 3 W runs up to 24v, I would guesstimate that nominal speed means no load and max voltage !
Although the easy way out is to use something like an lm 317 where 2 referance resistors (quality multi turn variable) could be switched (make before break) to give you both speeds.
Try a linear servo regulator that uses back e.m.f feedback NOT p.w.m. as this puts the noise back in that not using mains a.c. eliminates !
If you dont want to build one, look through the RS catalouge,but these are on the pricey side and can handle 60w plus (like amp P.S.U`s nothing wrong with a bit of headroom), but have possibilities.
The premotec cl 29 3 W runs up to 24v, I would guesstimate that nominal speed means no load and max voltage !
Although the easy way out is to use something like an lm 317 where 2 referance resistors (quality multi turn variable) could be switched (make before break) to give you both speeds.
I picked up a DC motor from an electronics surplus shop. It is Russian, very well made -- and superficially is of equal quality to Maxon and Escap motors. Very heavy, nicely finished. It cost me around $12. I have no specs for it, but the shop I bought it from said it was a 30V.
It runs all the way from 1.2v up to 32v, meaning that fine tuning the speed is easy.
To control it I use a simple laboratory DC power supply, which can fine tune the voltage in 0.05v increments. This cost me around $30.
The motor runs extremely quietly, even at full power.
My view is that with a very heavy platter and spindle weight, speed changes due to things like stylus drag should be negligable.
I am not very much into electronics, so I haven't even thought of getting some kind of chip speed controller.
Try hunting through electronic surplus shops if you have the time, otherwise contact Maxon and buy a motor direct from them as mentioned above. In the end the cost of around 42 euros is damn good.
But for a really simple (and cheap) recipe, I would look here - the Krishu.de site mentioned above.
let us know what you end up with...
It runs all the way from 1.2v up to 32v, meaning that fine tuning the speed is easy.
To control it I use a simple laboratory DC power supply, which can fine tune the voltage in 0.05v increments. This cost me around $30.
The motor runs extremely quietly, even at full power.
My view is that with a very heavy platter and spindle weight, speed changes due to things like stylus drag should be negligable.
I am not very much into electronics, so I haven't even thought of getting some kind of chip speed controller.
Try hunting through electronic surplus shops if you have the time, otherwise contact Maxon and buy a motor direct from them as mentioned above. In the end the cost of around 42 euros is damn good.
But for a really simple (and cheap) recipe, I would look here - the Krishu.de site mentioned above.
let us know what you end up with...
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