Slo-Syn TS25-1024 "stepper motor" info?

[The Artful Bodger]

I assume the depiction of batteries in diagram 17 indicates this is a DC configuration and the words tell us that one cycle of the potentiometer section would move the motor just one tooth interval (i.e. 100th of a circle). So this is not a continuously rotating motor but one that steps forwards and backwards according to the voltages produced by the potentiometer thingy.

I do not have and have never seen anything like the potentiometer arrangement but I do have a variety of Slo-Syn devices and I expect they will still be sitting on their shelf when I am carried out the door for the last time.

[MaxHeadRoom]

So it would seem. It is actually a "PSC" motor, and nothing to do with a stepper despite what it says at the top of the label.

.

It is not a PSC in the general sense of the word and typical application, it is a combination, if you like, that uses stepper motor technology in order to synchronize the stepping rate to the frequency of the supply.
If you were to dismantle and inspect it before any other information, you would deduce it is a stepper motor. 🤔

[J Tiers]

It is not a PSC in the general sense of the word and typical application, it is a combination, if you like, that uses stepper motor technology in order to synchronize the stepping rate to the frequency of the supply.
If you were to dismantle and inspect it before any other information, you would deduce it is a stepper motor. 🤔

it's too bad that a couple of the relevant illustrations from the link are missing..... I have not yet found a sequence that steps this motor, although the link claims it can be done, and illustrates it with fig 20 which is unfortunately a broken link

[MaxHeadRoom]

The Slo-Syn manual shows the phase shift capacitor version similar to a typical PSC arrangement, Also 2 phase arrangement where a 2 phase supply with 90deg shift can be used to operate the motor from 0 Hz to approx. 100Hz, to obtain 334 rpm for the TS series.

[J Tiers]

Is that stepping or just running?

I'd say that of course it will "run" if you electronically set up the same phase as with the PSC. Getting it to "step" is a bit different, as there is no inertia helping "pull it through". All combinations so far seem to step it forward a step, then back a half or so. At that point, it does not step forward. It sure will lock up with DC, however.

The link above from The Artful Bodger is supposed to have a circuit for stepping the 3 wire unit, but unfortunately that illustration is a broken link.

[Lew Hartswick]

I suggest JTiers was just born about 50 years too late . :-) Back in the early 50s some of the RADAR sets I worked on used those devices . It's been a bit long for me to remember how and for what but I do remember the the name, as well as synchros and all their variations . :-)
...lew... Don't know why this is in bold. ???

[MaxHeadRoom]

I suggest JTiers was just born about 50 years too late . :-) Back in the early 50s some of the RADAR sets I worked on used those devices . It's been a bit long for me to remember how and for what but I do remember the the name, as well as synchros and all their variations . :-)
...lew... Don't know why this is in bold. ???

If they were synchro's they are a little different technology, they were popular back then but have been largely replaced by other systems now
The general physical construction of a synchro is much like that of a 3ph electric motor. The primary winding of the transformer, fixed to the rotor, is excited by an alternating current. Due to electromagnetic induction, this causes currents to flow in three secondary windings fixed at 120 degrees to each other on the stator. The relative magnitudes of the secondary currents are measured and used to determine the angle of the rotor relative to the stator. The secondary currents can also be used to directly drive a receiver synchro that will rotate in sync with the transmitter version, IOW one transmits the other moves in
'synchronism'
I still have my course books from 1959!

[sch]

I have one of these from ~15yrs ago, with mine having a name plate identical to J Tiers name plate except for rotation rate of 72 rpm.
Motor is a chunky thing about 5-8 lbs and 5" diameter , ~6" long. The circuit to run is similar to Artful Bodgers "A" circuit and
using a 50ohm 20 watt or so resistor in series with an AC oil type 7.5 µF cap across the red and black wires. Then 120v ac is
supplied white to white on motor and black to either red or black to switch rotation direction. Rotation rate is fixed, can't be changed.

I had the idea of using it for a knee motor but it was way too puny for that.

[The Artful Bodger]

I have one of these from ~15yrs ago, though mine has a name plate identical to J Tiers name plate except for rotation rate of 72 rpm.
Motor is a chunky thing about 5-8 lbs and 5" diameter , ~6" long. The circuit to run is similar to Artful Bodgers top circuit and
using a 50ohm 20 watt or so resistor in series with an AC oil type 7.5 µF cap across the red and black wires. Then 120v ac is
supplied white to white on motor and black to either red or black to switch rotation direction. Rotation rate is fixed, can't be changed.

I had the idea of using it for a knee motor but it was way too puny for that.

These and other devices can be extremely frustrating to have in one's possession. They look like they must have been very expensive when new but they stubbornly refuse to respond to any configuration of circuit, voltage or frequencies that we may offer up to them.

[MaxHeadRoom]

I have seen and used these in the past with no problem, they were originally intended to run at set-fixed speed from the mains frequency, in the past I have seen them used for spooling material where a very accurate RPM has to be maintained requiring no additional feedback.

[J Tiers]

I suggest JTiers was just born about 50 years too late . :-) Back in the early 50s some of the RADAR sets I worked on used those devices . It's been a bit long for me to remember how and for what but I do remember the the name, as well as synchros and all their variations . :-)
...lew... Don't know why this is in bold. ???

Heh.... how old (or young) do you think I am?