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您好,我发布了另一个用户发布的这个问题,但没有答案。
有人可以帮忙吗? 我已经非常成功地使用嵌入式ARM处理器控制L6470步进驱动器芯片,以实现除无传感器失速检测功能之外的所有功能。我希望我错过了一些东西,有人可以向我指出这一点。我一直在这个论坛上,我可以看到每一块ST文档。 当我试图检测失速时,检测阈值似乎非常敏感;在一个电流设置下,芯片检测到任何停顿,并且在下一个失速阈值电流增量时,芯片显示停止。这几乎使该功能无法使用,所以我没有使用它。我真的希望能够使用这个功能,因为我们不能把编码器放在任何地方。此外,这是我们选择驱动芯片的一个原因,如果我们不能使用该功能,那将是令人失望的。 我错过了一些明显的东西吗除了L6470数据表中包含的内容之外,是否有更多关于此功能的文档? 谢谢,马克 #失速检测L6470 以上来自于谷歌翻译 以下为原文 Hello, I am posting this question that another user posted but there was no answer. Can anyone help? I've been quite successful at controlling the L6470 stepper driver chip from my embedded ARM processor for all features other than the sensorless stall detection feature. I'm hoping that I'm missing something and that someone can point that out to me. I've been all over this forum and every scrap of ST documentation I can get my eyes on. When I try to detect stalling, the detection threshold seems to be very sensitive; at one current setting the chip detect any stalls, and at the next increment of stall threshold current the chip shows stalling. This pretty much makes the feature unusable, so I'm not using it. I would really like to be able to use this feature, since we can't afford to put encoders everywhere. Also, it's one reason we picked the driver chip, so it will be disappointing if we can't use that feature. Am I missing something obvious? Is there more documentation around this feature other than what is contained in the L6470 datasheet? Thanks, Mark #stall-detection-l6470 |
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亲爱的马克,
无传感器失速检测有效性取决于电动机的BEMF,特别是它在运行(BEMF存在)和失速状态(零BEMF)之间引起的电流变化。 你能检查一下你手机的当前变化吗? 有限的电流变化可能由以下条件引起: - 低速运行(低BEMF几乎等于无BEMF) - 高速运行(与BEMF相比,电感降低占主导地位) - 具有低ke值的步进电机 问候 恩里科 以上来自于谷歌翻译 以下为原文 Dear Mark, the sensorless stall detection effectiveness depend on the BEMF of the motor, and in particular the current variation it causes between the run (BEMF is present) and stall condition (null BEMF). Can you check what is the current variation in your case? A limited current variation can be due by the following conditions: - low speed operation (low BEMF is almost equal to no BEMF) - high speed operation (inductive drop is dominant compared to BEMF) - stepper motor with low ke value Regards Enrico |
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