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Old 20th April 2009, 09:09 AM   #1
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Default Help required for choosing an AC sync motor for a belt driven turntable.

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.
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Old 11th May 2009, 05:55 AM   #2
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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
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Old 12th May 2009, 08:40 PM   #3
Nanook is offline Nanook  Canada
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Default what motor is it?

I too am looking, but require a 300 rpm one
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Old 13th May 2009, 03:46 AM   #4
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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.
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Old 13th May 2009, 04:11 AM   #5
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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.
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Old 13th May 2009, 05:40 AM   #6
Nanook is offline Nanook  Canada
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Default 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...)
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Old 13th May 2009, 06:52 AM   #7
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@ 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.
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Old 13th May 2009, 01:30 PM   #8
MIDUN is offline MIDUN  United States
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Default Premotec motors.

Check out the last motor on this page.

Premotec turntable motor
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Old 13th May 2009, 07:15 PM   #9
Nanook is offline Nanook  Canada
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Default 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.
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Old 13th May 2009, 09:48 PM   #10
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Quote:
Originally posted by binspaul
Mark: I think it is not a stepper motor. Can you explain me how you arrived at that statement ?


Detent Torque
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