L6470电机失步

你好，


我正在评估L6470作为已停产芯片的替代品，目前已在我们的应用中使用。
我必须达到高速（2500步/秒），但是当超过800步/秒时，电机会失步。以下是我的电机特性：根据数据表：
Rm = 0,8欧姆
Lm = 1 mH
（我测量的Rm = 3,3欧姆; Lm = 5.3 mH）
ke = 0,115 V / Hz

我用的是24V电源。
我用dSPIN评估工具尝试了很多不同的参数，但800步/秒似乎是上限，尽管旧的电机驱动器很容易达到2500步/秒。

有人对我有暗示吗？
顺便说一下，我正在评估EVAL6470H板。

问候，
斯特凡



以下为原文




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