L6470 WITH UNIPOLAR MOTOR

sojaewoo · ‎2013-12-16

Posted on December 16, 2013 at 09:50

I use ST L6470 with unipolar motor.

L6470 is biplar type dirver, so I unconnected com line of unipolar motor.

motor spec is below:

MAKER: sanyo denki

type : 103H5210-0480

1.2A/1.8DEGREE/3.3OHM.

because unconnected com line, resistor is 6.6Ohm.

I apply DC24V in the motor.

The problem is that motor is not reached 1500PPS. under 1000PPS, motor is well opeared.

Is it problem thar unipolar motor is used not bipolar?

I changed all variable factor(acc,dec,kval, etc...), but it reached 1500PPS.

what is wrong?

#d

Enrico Poli · ‎2013-12-16

Posted on December 16, 2013 at 13:37

Hello,

Unipolar motors can usually also operate in bipolar mode.

Your issue could be related to resonances.

Please, try the following:

- Set the full-step speed (FS_SPD register) to the maximum. Voltrage mode driving gives best results in microstepping operation

- Add a small mechanical load to the motor shaft in order to shift the resonance point and dampen the vibration.

Regards

Enrico

sojaewoo · ‎2013-12-16

Posted on December 16, 2013 at 15:38

sojaewoo · ‎2013-12-16

Posted on December 16, 2013 at 15:41

Enrico Poli · ‎2013-12-19

Posted on December 20, 2013 at 08:26

Hello,

did you try to add a mechanical load on the motor shaft? This could be a resonance issue.

Regards

Enrico