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Spider27

Most Ideal type of motor for turntable

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Posted (edited)

The ideal turntable motor doesn't exist, YET. All the technology exists, but noone has ever built one.The BLDC motor driven by a seriously accurate three phase AC signal is unquestionably the way to go. Unfortunately ALL of the currently produced BLDC's use ballrace bearings, which are great for long term service life but are far too mechanically noisy, the ideal solution is a BLDC 3 phase motor with sleeve bearings, but no such animal exists!. I've been developing a design for such a motor in conjunction with the applications engineers at Maxon,  same form factor as the Permotech motor, but with zero torque ripple and ten times the torque. It's going take a while,  but it's do-able.

 

Steve

Edited by Number 9
lexdysia

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3 hours ago, andyr said:

The speed of a DC motor is controlled solely by the voltage fed to it

Except they sometimes call a motor "DC" when it is actually  synchronous with built in electronics to drive it from a DC power supply.    

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1 hour ago, aussievintage said:

Except they sometimes call a motor "DC" when it is actually  synchronous with built in electronics to drive it from a DC power supply.    

 

Do 'they' really?

 

The motor controller for my Premotec (synchronous) AC motors is driven by a 48v Meanwell SMPS - yet no-one refers to them as "DC motors"!  9_9

 

Andy

 

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1 minute ago, andyr said:

 

Do 'they' really?

 

The motor controller for my Premotec (synchronous) AC motors is driven by a 48v Meanwell SMPS - yet no-one refers to them as "DC motors"!  9_9

 

Andy

 

oh dear, everything isn't about you Andy.

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1 minute ago, aussievintage said:

oh dear, everything isn't about you Andy.

 

Good one, av!  :thumb:  Just because some f'wit misunderstands the difference between an AC motor and a DC motor ... shirley doesn't mean his "understanding" should be adopted by others?

 

Andy

 

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Posted (edited)
9 minutes ago, andyr said:

 

Good one, av!  :thumb:  Just because some f'wit misunderstands the difference between an AC motor and a DC motor ... shirley doesn't mean his "understanding" should be adopted by others?

 

Andy

 

 

That's pretty ironic considering the crap frequently posted around here.   We are not responsible for what marketing might choose to describe a product as, but we need to deal with it.

Edited by aussievintage

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Hello,

Do you have any measurable figures to show the way one design is superior to the other ? Other than snake oil and listening ?

I would _like_  to see wow and flutter figures, rotational speed accuracy of the various design you talk about, and, add to this the measured values of the noise floor they produce.

But it is just me 😉

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Hello Georges,

 

engineering will have a lot to do with the measured results you ask for, perhaps more than the generic type of motor itself. Also engineering of the motor controller, and engineering of the power supplies -- of motor and of controller.


regards

Grant

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