Greetings fellow Reprapers!
I want to ask you for advice regarding setting properly the Vref for my extremely hot stepper motors.
But first some details to know what is the setup.
- Reprap Prusa Mendel
- Gen.7 1.5.1 electronics (thanks Traumflug!)
- Pololu drivers
And most importantly:
5 exact stepper NEMA17 motors:
- degrees per step: 1.8
- voltage: 12 V
- peak current: 0.5 A
- resistance: 25 ohm
- inductance: 46 mH
- static torque: 4.4
- 4 wires
Right now I know that high voltage motors are not recommended, but the time I bought them I was even less experienced than now ;)
Anyway, following the Reprap- Sanguinololu setup instructions,( [reprap.org] ) I calculated the Vref for my motors to be:
Vref = 0.14V.
Then carefully I set them on the Pololu's, and started other calibrations. But after a while of printing I found out that the working motors are heating quite much (I can not measure the temperature, but its hard to keep a finger on them). I suppose this is because of too high current going through the motors. At the same time, I am not sure in which way to change the Vref on the Pololus not to screw up the whole printer.
I would really appreciate any suggestions, directions, well, any help!
Best,
Paweł
I want to ask you for advice regarding setting properly the Vref for my extremely hot stepper motors.
But first some details to know what is the setup.
- Reprap Prusa Mendel
- Gen.7 1.5.1 electronics (thanks Traumflug!)
- Pololu drivers
And most importantly:
5 exact stepper NEMA17 motors:
- degrees per step: 1.8
- voltage: 12 V
- peak current: 0.5 A
- resistance: 25 ohm
- inductance: 46 mH
- static torque: 4.4
- 4 wires
Right now I know that high voltage motors are not recommended, but the time I bought them I was even less experienced than now ;)
Anyway, following the Reprap- Sanguinololu setup instructions,( [reprap.org] ) I calculated the Vref for my motors to be:
Vref = 0.14V.
Then carefully I set them on the Pololu's, and started other calibrations. But after a while of printing I found out that the working motors are heating quite much (I can not measure the temperature, but its hard to keep a finger on them). I suppose this is because of too high current going through the motors. At the same time, I am not sure in which way to change the Vref on the Pololus not to screw up the whole printer.
I would really appreciate any suggestions, directions, well, any help!
Best,
Paweł