I’m guessing it was originally fitted to one of their proprietary gearboxes, with a fixed reduction ratio, to give a 75rpm final output.
I have something similar, but don’t recall the make offhand.

Bill

Strangely … SD9 doesn’t seem to feature on the current Parvalux website:

https://www.parvalux.com/

… but it’s worth browsing, to see their wide range of products.

MichaelG.

That Parvalux motor is also unusual in being wound (or rated for) 220 and 380VAC. Because of its current application driving a watchmakers lathe I presume it is single phase although it is possible that if it was part of some industrial equipment a transformer might have been incorporated. The plate then showing the system rating just like the speed and the torque value (too high to be the motor spindle).

Ian P

On 14 November 2024 at 20:48 not done it yet Said:

Help yourself?  Their telephone number is 01189 733337

Well that’s a thread stopper!

No need for this forum, anyone with a problem can just find the manufacturers phone number and get help direct.

Ian P

1. I have an illustrated 1999 Parvalux catalogue which shows a 75rpm SD8  gearbox unit, which is rated at 35 watts. Wonder if the SD9 is a later iteration of this unit ?

I have some spare Parvalux FHP motors with or without gearbox if you need a replacement, all 230vAC working.

Emgee

On 14 November 2024 at 21:00 Ian P Said:

On 14 November 2024 at 20:48 not done it yet Said:

Help yourself?  Their telephone number is 01189 733337

Well that’s a thread stopper!

No need for this forum, anyone with a problem can just find the manufacturers phone number and get help direct.

Ian P

Ringing firms up and asking for information is worth a try, but don’t expect an answer!   My day job once had a responsibility for answering queries. Historical questions were often too expensive to answer because they required a paper archive on a remote site to be opened up and searched.   About 3-4 hours work, thirty years ago, costing a couple of hundred quid.   Later, the organisation decided there was very little value in answering casual interest queries and laid down strict rules for anything costing more than £30. Enquiries were discouraged unless they were from a serious source. Parvalux might be happy to explain an obsolete motor if the information happens to be at hand, but I fear they’ll decline the offer.  Unless of course a customer rings up wanting to buy a thousand new ones…

Other than the mystery of the plate information, I don’t think Mike has a problem with the motor?  Presumably it works OK.

I think the plate seems peculiar because the motor was originally supplied with a reduction gearbox.  Therefore the plate tells us what the output shaft does:  75rpm with a Torque of 14 pounds per inch.   I don’t think the plate is a Friday job, it just relates to the motor/gearboxes original application, where the currency is torque, not power.

14 lbf/in is about 2.5Nm (Newton Metres) and it was delivered at 75rpm.   This online calculator suggests that equates to an output power of about 20W, which seems low to me, but maybe the worm drive was exceptionally inefficient.   Assuming the worm was 50% efficient, then the motor output needed to turn it would be about 30W, roughly 36W input.   However, the motor is rated to deliver that torque through the gearbox continuously, so maybe double or triple the estimated motor power to perhaps 100W input, roughly ⅛HP, which seems reasonable for a watchmakers lathe.

Dave

On 15 November 2024 at 13:05 Ian P Said:

Why do you think the motor plate shows 220 and 380 volts, seems unusual for a such a small motor. The one on ebay seemed to have several capacitors with it, maybe it uses one as a capacitive dropper and another for phase shift.

Maybe Mike will let us know how its wired or when Parvalux reply.

Worm (we are assuming here) reduction gearing must be about 20:1 to get the 75rpm.

Mike told us that he uses it with a watchmaking lathe, its probably not its original application.

 

Ian P

The SD8 frame size motors are available in both single & 3 phase; the latter might well be marked as dual voltage.
Single phase motors often have a capacitor as a permanent run, one of mind does; see the 2007 catalogue.
Similarly a 3 phase motor can be made to run on single, with the addition of one or more capacitors, depending on the starting torque requirement.
The presence of a capacitor may well be misleading, if a previous owner has re-purposed a 3 phase motor, wired as delta, and added a phase shift run capacitor across one of the windings.
The clue might well be in the wiring colours, and/or the coil resistances.

Bill

I’m with peak 4, I reckon it’s a three phase motor with a Steinmetz connection to make it run off single phase. How to wire it up is covered in the workshop practice book on electric motors.

It seems like a bodge, but I’ve successfully done it on a grinder. You can’t get full power, but not far off.

On 15 November 2024 at 11:39 Andrew Tinsley Said:

I have found Parvalux to be extremely helpful in answering telephone queries. I contacted them a few years ago and they even sent me details of their old motors FOC, which were no longer in production.

I don’t want to get involved in the above spat. Just saying how helpful Parvalux was. Made a refreshing change.

Andrew

A little late to the thread, but Parvalux used to be based literally at the bottom of the road where I lived (they moved recently). As such, I was able to walk through the front door of their premises and always had help with queries about and replacement parts for out of production motors. Very few companies can do that these days.

One of the few companies one can approach before needing to resort to the online forums.

Cheers,

Duff.