AnsweredAssumed Answered

L6470 loosing steps

Question asked by stst on Jul 16, 2013
Latest reply on Aug 1, 2013 by Enrico Poli
Hello,

I am evaluating the L6470 as replacement for a discontinued chip, which is used in our application in the moment.
I have to reach high speed (2500 step/s), however when going above 800 step/s the motor looses steps. Here are my motor characteristics: according to datasheet:
Rm = 0,8 Ohm
Lm = 1 mH
(I measured Rm = 3,3 Ohm; Lm = 5,3 mH)
ke = 0,115 V/Hz

I use 24V power supply.
I tried a lot of different parameters with dSPIN Evaluation tool, but 800 step/s seems to be the upper limit, although the old motor driver reaches 2500 step/s easily.

Does anyone have a hint for me?
BTW, I'm evaluating with EVAL6470H board.

regards,
Stefan

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