Help required for choosing an AC sync motor for a belt driven turntable.

[binspaul]

Hi,

I am currently designing a belt driven turntable and the motor I am planning to use is an 24 pole AC sync motor running at 250 RPM on 50 Hz. The motor will be driving an acrylic-wood combination platter weighing around 4 Kg via a silk thread.

The motor specification sheet states that the detent torque value is 60 gm-cm and the running torque value is 240 gm-cm. It also states that the HVT value is 2.0 KV (motor voltage>40V) or 0.6 KV (motor voltage<40V) for 1 min. I would like to know whether this motor is OK or not.

Best regards,
Bins.

 

[binspaul]

Hi,

Finally found a good AC synchronous 24 pole motor that suites my need. The details are given below. Currently, I am in the process of developing a new power supply unit for my turntable.



Best regards,
Bins

 

[Nanook]

what motor is it?

I too am looking, but require a 300 rpm one

 

[binspaul]

Hi Nanook,

The motor I am having will rotate at 250RPM on 50Hz and 300 RPM on 60Hz. Will that match your purpose ? One of my friends deals with that motor and I can get you some if required.

Best regards,
Bins.

 

[Mark Kelly]

I would expect very poor results with that motor, it seems to be a stepper. The very high ratio of detent torque to run torque corresponds to a torque ripple (AKA cogging) of 25% at max torque. At lower average torques the ripple will be even greater.

 

[Nanook]

mark, and binspaul

really what I am looking for is a replacement for a Premotec 9904-111-31302 as found in an Ariston RD11 (not an "S"). I have been posting in "help revive Ariston RD11s" thread. This motor issue just came up.

Maybe it's just me, but I am having some problems finding a replacement. I can try a DC type if need be, but isn't my table...so...

Mark, Altmann uses and promotes the use of steppers for turntable use if driven by a proper signal..(and the proper stepper is used...)

 

[binspaul]

@ Mark: I think it is not a stepper motor. Can you explain me how you arrived at that statement ?

@Stew: I was also going the PREMOTEC way. Give me your mail-id, I will mail you the motor details.

Best regards,
Bins.

 

[MIDUN]

Premotec motors.

Check out the last motor on this page.

Premotec turntable motor

 

[Nanook]

midun..thanx....

now to find an online or Canadian or American supplier....

DC motors are so much easier! Just the controllers can be a little hard.

 

[Mark Kelly]

Mark: I think it is not a stepper motor. Can you explain me how you arrived at that statement ?

Detent Torque

 

[binspaul]

Hi Stew,

I have sent you the details. I forgot the fact that I already had your mail-id with me. Can you post a comparison with this motor and the one from PREMOTEC ? It will be really helpful for me also.

Best regards,
Bins.

 

[binspaul]

Hi,

What is your opinion on the below given AIRPAX motor ? Is this one a good motor for using in a turntable ?

The motor details are as follows:

• 
  MOTOR, 240VAC, 250RPM, NO EARS
  Centres, Fixing:60.2mm
  Current Rating:16mA
  Diameter, External:51mm
  Diameter, Fixing Hole:3.5mm
  Diameter, Shaft:3mm
  Length / Height, External:25mm
  Length, Shaft:8.2mm
  Power Consumption:3.5W
  Speed, No Load:250rpm
  Temp, Op. Max:60°C
  Temp, Op. Min:-20°C
  Torque:20N-m
  Voltage, Operating Nom:240V

The motor technical details can be accessed at the link: http://www.farnell.com/datasheets/330534.pdf

Best regards,
Bins.

 

[palasr]

Try here:

http://www.hurstmfg.com/hurstmfg/qseries.jsp?series=Series+A,+AB+Direct+Drive+Synchronous+Motor

These are very decent motors, and used by VPI among others. They'll ship direct from the factory, and the price is a reasonable US$60 (approximately).

-Richard

 

[binspaul]

Hi Richard,

Thanks for you suggestion. What I actually need is the opinion on using the AIRPAX- 330534 motor. Can someone tell me whether I can employ this motor in a DIY turntable like the trusted brother 9904 111 31813 ?

Best regards,
Bins.

 

[binspaul]

Hi,

Please suggest...

Regards,
Bins

 

[binspaul]

Hello,

I am having an AIRPAX AC Sync. motor (9904-111-31104) with me and I would like to use it for my custom turntable. It is stated in the first page of the manual that the motor works in the parallel mode (220 VAC using a 0.1uF phasing capacitor). The motor I am having is the one with solder terminals (totally 4).

Can someone help me in identifying the correct terminals and the right way to connect it ?

Best regards,
Binu Paul.

 

[coolmaster]

If your place have 50hz mains, use 0.22uF for phasing cap. If not mistaken 0.1uf is for 60hz mains (USA, Japan and others)

 

[binspaul]

Hi,

I think 0.22uF is for the 990411131813 model. Please see the attached image for the 990411131104 specification details (220V AC Supply). Also, How can we identify the correct terminals (The connections and the terminals are not clear in the 990411131104 specification sheet) ?

Best regards,
Bins.

If your place have 50hz mains, use 0.22uF for phasing cap. If not mistaken 0.1uf is for 60hz mains (USA, Japan and others)

 

[Renron]

Try here:

Hurst Motors - Your place to find BLDC, Permanent Magnet DC Stepper and AC Synchronous

These are very decent motors, and used by VPI among others. They'll ship direct from the factory, and the price is a reasonable US$60 (approximately).

-Richard

While digging around different threads, I stumbled across this one. Very interesting stuff.
Not knowing anything about motor ratings, what are the minimum mN-M torque requirements. Found a few on the site Richard posted and they ar indeed quite reasonable priced. One is rated at 19.1 nM-m, I presume it depends on how heavy the platter is? If VPI uses them, how bad could they be? AND, how much of a difference is a DC motor going to make in a DIY turntable project? There are premade solutions out there that are DC motors and variable speed controllers for ~$200 on the low end and on up from there.
Bins, I'm watching you because we're both making a version of the Schroeder tonearm. I'm very slow thou.


Ron

 

[3GGG]

I am looking at this hurst motor.
PA 3201-0041 the 24 volt version

PA, PB Direct Drive Permanent Magnet AC Synchronous Motors

any thoughts