[问答]

L6472/L6474预测和峰值电流调节之间没有区别

问答对人有帮助，内容完整，我也想知道答案 0 我遇到了L6472当前规定的问题。我们制作了2个系列的电路板，一个配有L6474，另一个配有L6472。该板有8个通道，供电电压为24V / 3.3V，定时参数默认复位，内部振荡器。电机绕组有1.7欧姆，3.6mH。该板有4层35 m，包括24V和GND的实心平面。 L6474的一切都很好。利用L6472，相电流急剧地接近微步序列的过零点。所有通道都受到影响，但通常只有每个通道的一个相位。预测和峰值电流调节之间没有区别。我有几个想法可能是错的： 1）电流测量受一些地移效应的影响 2）电源电压太嘈杂 3）次优时序参数我想知道在哪里先看。＃l6472-current-regulation＃l6472-l6474-current-regulation 以上来自于谷歌翻译以下为原文 I am experiencing problem with the current regulation of the L6472. We made 2 series of boards, one was fitted with L6474s, the other one with L6472s. The board has 8 channels, supply voltage is 24V / 3.3V, timing parameters are reset default, internal oscillator. The motor windings have 1.7Ohm, 3.6mH. The board has 4 layers of 35�m including solid planes for 24V and GND. Everything is fine for the L6474. With the L6472 the phase current jumps wildly close to the zero crossing of the microstep sequence. All channels are affected, but usually only one phase of each channel. No difference between predictive and peak current regulation. I have several ideas what could be wrong: 1) Current measurement influenced by some ground shift effect 2) Supply voltage too noisy 3) Suboptimal timing parameters I am wondering where to look first. #l6472-current-regulation #l6472-l6474-current-regulation 0
2018-11-5 10:15:05　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × wang21cj 该类别下有 47 个回答。邀请回答 chm5 该类别下有 44 个回答。邀请回答新星之火12138 该类别下有 42 个回答。邀请回答 hgimtk 该类别下有 36 个回答。邀请回答 HengDu 该类别下有 31 个回答。邀请回答 hwp0415229 该类别下有 30 个回答。邀请回答可口可甜该类别下有 30 个回答。邀请回答 jghgfdssas 该类别下有 28 个回答。邀请回答 jiangwenwen 该类别下有 28 个回答。邀请回答 kingnet6688 该类别下有 28 个回答。邀请回答麻酱该类别下有 28 个回答。邀请回答 andyfly7 该类别下有 28 个回答。邀请回答 bluepink 该类别下有 27 个回答。邀请回答法规处发该类别下有 27 个回答。邀请回答 ldliu 该类别下有 27 个回答。邀请回答成长的小师弟该类别下有 27 个回答。邀请回答云汉007 该类别下有 27 个回答。邀请回答颜刚YanG 该类别下有 27 个回答。邀请回答柱子图宁该类别下有 27 个回答。邀请回答 uuwyfsdfsf 该类别下有 26 个回答。邀请回答举报刘东相关推荐 • L6472当前设置不稳定 1618 • L6472参数设置和步进速度之间的关系是什么？ 1733 • L6474温度过高 1441 • L6472步进驱动器布局需要使用4层PCB吗？ 2142 • L6472中的失速检测 1496 • L6472步进时钟模式电机轴移动1到2度 2925 • L6474接地和布局有什么建议 1188 • 保持当前设置L6472 1111 • 请问我们可以在L6474上实现失速检测吗？ 1511 • L6474的过热问题 1460 2个回答

答案对人有帮助，有参考价值 0 你好，这似乎是对电流感测电路的抵消效应。您可以尝试以下解决方案： - 略微增加目标电流，这样传感电路应该更好地工作 - 减少快速衰减持续时间（快速衰减导致系统失控） - 降低压摆率顺便说一下，你当前的控制设置是什么（快速衰减，最短时间，tsw等）？问候恩里科以上来自于谷歌翻译以下为原文 Hello, This seems to be an offset effect on the current sensing circuitry. You can try the following solutions: - slightly increase the target current, this way the sensing circuitry should work better - decrease the fast decay duration (the fast decay causes the system to go out of control) - decrease the slew rate By the way, what is your current control setup (fast decay, minimum on time, tsw, etc.)? Regards Enrico

2018-11-5 10:25:07 评论举报刘璐

答案对人有帮助，有参考价值 0 我有类似的问题。我们遇到了IC过热的问题，因此我提高了压摆率并且有所帮助。但现在，我们看到随机过电流，我想知道单独降低快速衰减持续时间是否足够。我们有3个3欧姆/ 3mH范围的电机，我目前的参数是推荐用于L6472评估板的： POW_SR = 00 ton_min = 4us toff_min = 21us toff_fast = 10us fast_step = 16us tsw = 48us 我尝试将fast_step放到10us，它似乎工作正常，但错误是间歇性的，我想有一些余地。有什么建议么？此外，我想知道你是否可以解释为什么调整SR或快速衰减有帮助。以上来自于谷歌翻译以下为原文 I'm having a similar issue. We had problems with overheating of the IC, so I increased the slew rate and that helped. But now, we're seeing random over-currents and am wondering if dropping the fast decay duration alone will be enough. We have several motors in the 3 ohm/ 3mH range, My current parameters are what was recommended for the L6472 Eval board: POW_SR = 00 ton_min = 4us toff_min = 21us toff_fast = 10us fast_step = 16us tsw = 48us I tried dropping fast_step to 10us, and it seems to work ok, but the error is intermittent, and I'd like to have some margin. Any suggestions? Also, I wonder if you can explain why adjusting the SR or fast decay helps.

2018-11-5 10:38:46 评论举报马慧霞