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Author Topic: Vintage Stepping Motors  (Read 1033 times)
IZ5PQT
Member

Posts: 95




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« on: April 15, 2018, 08:20:25 AM »

Hello. I am posting my question in the Elmers Forum because only elmers could help me.
I was given two stepping motors which I would like to use for remote tuning of a loop
antenna. Unfortunately I was unable to locate a datasheet or at least the operating voltage
since the manufacturer (the famous Sigma Instruments) went out of business.
The models I have are 20-2223D and 20-2235D and have eight wires.
Any help is appreciated

73 giovanni

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N5EG
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Posts: 331


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« Reply #1 on: April 15, 2018, 08:36:43 AM »

Hi Giovanni,
Certainly is hard to find specs or information about those !

Most steppers motors are designed to operate from roughly 12 to about 36 or 48 VDC
on the windings, with controller current limit.  General purpose stepper controllers
(depending on vintage) may have a potentiometer to allow adjusting the current limit.

You need some idea of how much torque is required for your application. You can
try mechanically loading the stepper with your tuning device to see the tradeoff of current
versus when the stepper stalls (if at all).

One way to ballpark the operation is to start at a low current limit and operate the motor
for awhile while monitoring the temperature.  Then increase the current limit and run
for awhile while monitoring the temperature.

-- Tom, N5EG



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IZ5PQT
Member

Posts: 95




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« Reply #2 on: April 15, 2018, 08:59:48 AM »

Hi Tom,

thanks. In my case the needed torque is close to zero. My worry was not to burn
the coils. Your information about limiting the current is quite useful.

73 Giovanni IZ5PQT




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K8BYP
Member

Posts: 256




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« Reply #3 on: April 16, 2018, 06:20:26 PM »

There are many new steppers available from China, all of extrordinary quality EXCEPT that all "cheap" stepper motors have junk bearings.

The larger question is not the motor but the drive electronics. stepper windings must be properly current driven and limited in sequence.

There are many also inexpensive drivers from China. Try on line sources.

Digi Key in US were selling board level intelligent drivers made by S-T, they were PC operated via USB, they were $25 USD./
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KD0REQ
Member

Posts: 2148




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« Reply #4 on: April 23, 2018, 07:42:01 AM »

If those steppers came out of floppy drives, they are  probably 12 volts, driven from open collector circuits.
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