maxon motor controller for turntable

[KMMM]

hi

I'm building a DIY TT and I'm looking for a high quality DC motor controller.
Mark Kelly's versions aren't that easy to get hold of. Hagtech is developing one but I don't know how it's coming along. It shouldn't be to difficult to build for a novice eather...

Came across Maxons LSC 4-Q-DC Servoamplifier and ADS_E 4-Q-DC Servoamplifier.
Would these (or other Maxon stock controllers) be a good choice for a TT)

Hope someone can help (I'm planning to use a Maxon (type?) motor and belt drive.The platter will be aprox 15kg)

best regards

 

[Werner]

I have two sets of Kelly PCBs and no use for them.

Drop me a mail at werner @ tnt-audio.com if interested.

 

[KMMM]

Thank you Werner!
You'we got mail!

KMMM

 

[Werner]

For all the people asking about these boards, the whole lot of you,
they are gone.

 

[IZHAKKATZ]

Can anyone answer KMMM's question?
I'm also interested in a good Dc motor controler for a maxon motor

tnks
IK

 

[audiopip]

maxon controller for TT's

Hi Folks,

Assuming you are going the 110191 brushed motor route the maxon LSC 30/2 (pt no 250521) in IXR mode is probably the best choice of the standard maxon controllers.

It is an 'linear' (analogue) controller (all the other maxon controllers are 'digital' aka PWM) so will be electrically nice and quiet. Having said that the LSC30/2 has a number of features, of which some will not be required (4Q operation is probably unnecessary for example) so it is a possibly a bit of an overkill.

Regards
Jon Pippard
maxon motor Austalia

 

[Ephraim]

Hi audiopip
I want to purchase the naxon controller you mentioned in your previous post.
Do I need anything else to connect to it besides the power supply and the motor itself?

 

[Ephraim]

Thanks for the info.
But will I need anything else, like a tachometer or something similar, e.g. sensor?

 

[analog_sa]

It work just fine without a tacho or an encoder. The IxR action is important. Long term stability would also be nice but i cannot see an encoder working well in this application without having control of what it does.

Of course a voltage regulator + IxR correction are easy to achieve with simple circuits.

 

[jev]

Yes I use the LSC 30/2 with a switch (between 33 and 45 rpm) and voltage dividers to tune the speed (& to reach the 33 / 45 rpm voltage) with a tachometer

See also Maxon motors for TT use

 

[ralphfcooke]

Something along these lines:-
AB-026 : Sensorless Speed Stabiliser for a DC Motor - Precision Microdrives

The part referencing the AN6651 does work well.

 

[Mark Tillotson]

IxR correction is just another way to say negative resistance output? You cancel the winding resistance to get firmer control of the back EMF (which depends on speed).


I suspect to be immune from oscillation some more sophisticated contol strategy is needed than just setting a negative resistance, some damping is required.

 

[jev]

Hi, extra question for this topic. I am using the LSC controller with a powerfull but simple 78xx voltage regulators. Would it make sense to upgrade the regulators to something better like NewClassD UWB2 Regulator

Or will the LSC unit also have internal voltage regulators which will undo anything before it? (this is what I think)