AIRPAX SMA 82805, how knows this stepper motor?

[loup-garou]

AIRPAX SMA 82805, who knows this stepper motor ?

Hi,

did anyone use the bipolar-uniploar stepper motor below?

AIRPAX (USA), model:SMA 82805 (n.8845)

Volts:4.6
OHMS/COIL: 5
STEP ANGLE : 7.5


I would be grateful if somebody gives me further info about it ?, for exemple, what is the ideal voltage to use ?, the maximum current in the windings , is this correct Imax=4,6/5 ?, what is the value of the chemical capacitor to put next to the L298 (to supply the stepper with current) ?

PHOTO

thanks in advance for any kind of help.

 

[be80be]

Did that come out of a copier I have 1 I removed from a copier. It was 24 volts. I would say AIRPAX was a reseller of that not the maker
Look here **broken link removed**
and here
**broken link removed**
I looked at it it was 12 volts the 24 was for the lite in the copier. hope this helps you out
burt

 

[duffy]

Yes, with steppers you want to hit them with a higher voltage than what it says. The rating is for a steady-state DC, but you will get crap performance out of them if you try to pulse it off that low of a voltage.

 

[loup-garou]

hi,

thanks guys for your help.

thanks for the links be80be, I'll read them soon. concerning your question: I don't really know from where it comes (a friend bring it to me)

for the info: this stepper motor has 6 inputs (hence, it can be used as unipolar or bipolar)

will a 24V supply supply work fine ?

what does a crap performance stands for duffy ? (sorry, I don't understand the slang)

 

[duffy]

Slow and weak. Yes, 24V will work fine. Limit the pulse widths so you don't overheat the windings at low speeds.

 

[be80be]

I wouldn't run it at 24 volt. Run it with no more then 12. Like i said I took 1 out of a copier It was being power from 12 volts which is more then it's rating I thought it was 24 but I looked at the power supply that i saved and it was using 12 volts

 

[loup-garou]

Slow and weak. Yes, 24V will work fine. Limit the pulse widths so you don't overheat the windings at low speeds.

hi duffy,

thanks for this quick reply.
I was told, months ago, that the pulse width of the clock signal entering the L297 (with a 50% duty cycle most of the time) , don't has an effect on the motor , am I wrong here ?

 

[duffy]

I've seen 5V steppers run at 50V. The higher voltages work fine so long as you limit the pulse width.

 

[loup-garou]

I wouldn't run it at 24 volt. Run it with no more then 12. Like i said I took 1 out of a copier It was being power from 12 volts which is more then it's rating I thought it was 24 but I looked at the power supply that i saved and it was using 12 volts

hi again be80be,

I read somewhere on the internet, that the stepper motors in general can be run with power supply up to 8,10 times the value indicated on them ( rating is for a steady-state DC as said duffy) so that the current on the windings will decrese proportionally.

what's wrong with this motor so ?

 

[duffy]

I was told, months ago, that the pulse width of the clock signal entering the L297 (with a 50% duty cycle most of the time) , don't has an effect on the motor , am I wrong here ?

You are correct. With the L297/298 combo you limit the pulse widths with resistors, it has a built-in PWM.

 

[loup-garou]

You are correct. With the L297/298 combo you limit the pulse widths with resistors, it has a built-in PWM.

I see that you mean the resistor value of the RC network (which determines the chopper rate) connected to the OSC pin of the L297.


so I'll have to use a potientometer insted of resistor in my stepper motor driver board. (the values indicated on the datasheet (page 8 figure 2) are R=22k, C =3.3nf, any idea about the choice of these values ? )
http://www.datasheetcatalog.org/datasheet2/c/0g0gh362kxwx30o7xi4x2i4jzffy.pdf

 

[be80be]

You can run them at higher volts It give you more power. But how are you going to use the stepper say that you run it at 50% duty a 5volt could run at 10 and not burn it out but at 100% it wounldn't last long. you use the higher volt for more power at less duty

 

[be80be]

I've seen 5V steppers run at 50V. The higher voltages work fine so long as you limit the pulse width.

I bet it only on 1/5 the time

 

[loup-garou]

thanks be80be.