Hi all, my first post and I am more than a little confused.
I have a 1.8 degree step uni-polar motor that I need to turn at exactly 1 RPM. I have wired the motor as a 4 wire Bi-polar motor.
I have worked out that there are 200 steps per revolution and 60 seconds in a min so 200/60=3.3Hz
But when I drive the motor at (what I think is 3.3Hz!) it turns way too slow(maybe 1/10 RPM) What is wrong?
Here is a bit more info on how I am driving the motor
I have made an Astable ocillator circuit with a 555 timer chip, see link
LM555 Timer Circuits
From the calculator on the page I have worked the resistance and capacitor needed to give me the 3.3Hz pulse.
The step is then fed to a stepper motor driver( see link )
EasyDriver Stepper Motor Driver
The only way I can get close to 1 RPM is to drive the motor at about (what I think is!) 25Hz but I need it to be spot on.
Where am I going wrong?
Am so confused any help would be great.
Thanks for your time.