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sojaewoo
sojaewoo
Associate II
December 16, 2013
Question

L6470 WITH UNIPOLAR MOTOR

  • December 16, 2013
  • 4 replies
  • 1133 views
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
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4 replies

Enrico Poli
Enrico Poli
ST Employee
December 16, 2013
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
sojaewooAuthor
Associate II
December 16, 2013
Posted on December 16, 2013 at 15:38

sojaewoo
sojaewooAuthor
Associate II
December 16, 2013
Posted on December 16, 2013 at 15:41

Enrico Poli
Enrico Poli
ST Employee
December 20, 2013
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

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