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Author Topic: stepper motor problem  (Read 592 times)
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I was using easydriver to control a stepper motor and a 9v battery. The motor specs are here in portuguese: http://www.robocore.net/modules.php?name=GR_LojaVirtual&prod=362   

it is refurbished.

9v  and 2A /phase

it was working fine but stopped. I started with theses values:

digitalWrite(x, HIGH);
delayMicroseconds(10); //A
digitalWrite(x, LOW);
delayMicroseconds(300);  // B

Then I tried increasing the delay, 20 microseconds for A and 3000 for B, and it worked for a while. But now the motor doesn't turn anymore. And I can turn it by hand with almost no effort, it wasn't like this before. There's almost no torque anymore.

What I'm doing wrong? Should I buy a new one?

Thanks in advance.
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Edison Member
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The last thing you did is where you should start looking.
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What are you using for the 9 volt source?
10us,  way to fast!!
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Also schematic please...
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Shannon Member
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Not many 9V batteries can supply 200mA, let alone 2A....

That stepper is rated at 2A per phase and 2 ohm winding resistance - therefore it needs 4V, not 9V.

I suspect the 9V is the voltage for bipolar operation (two windings in series).
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Dead Battery.
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