[问答]

L6470评估步进电机应用的几个问题

问答对人有帮助，内容完整，我也想知道答案 0 你好，我们目前正在评估L6470驱动用于质谱分析的分析型高压泵。最终目标是在高精度微步进模式下驱动步进电机，速度约为1.7 Nm，最大转速约为100 rpm。为了进行评估，我们使用了之前测试的小型双极步进电机，其参数如下：型号：Trinamic QSH4218-51-10-049（附带短规格）额定相电流：1 APhase电流：5？相电感：8 mH测量K_e：0.02041（附件：BMF参数）作为电机驱动器，我们使用附带的EVAL6470H板STEVAL-PCC009V1 USB-SPI接口与dSPIN评估工具1.7结合使用。进一步参数：电源电压：30 V. 在我们的测试中，我们尝试在电机上做一些简单的旋转和向下任务，并使用空轴并获得电机驱动器的一些经验。但是我们在这一点上遇到了几个问题：电机以不同的速度加速（我们测试了2000,1000,500,100步/s ）到不同的速度。我们试图将它提高到大约2000步/秒但它总是在没有任何外力的情况下以大约1500步/秒（1/128微步）停止。''命令错误''标志经常被设置在使用评估工具设置参数。这是我们的问题：什么原因导致电机在这种情况下失速？我们如何在“现实世界”的应用中避免它？为什么“命令错误”设定？诊断有可能吗？（真正短的电缆，STEVAL-PCC009V1附带的电缆，大约10厘米）我们非常期待您的回答，并感谢您提前做出的努力！您忠诚的 #stepper-motor-driver＃stepper-motor＃l6470 以上来自于谷歌翻译以下为原文 Hello, We are currently evaluating the L6470 to drive analytic high-pressure pumps for Mass spectrometry. The final goal is to drive a stepper-motor in high precision micro-stepping mode at around 1.7 Nm at a maximum Speed of around 100 rpm. For evaluation we used a small bipolar stepper-motor from a previous test with the following parameters: Model: Trinamic QSH4218-51-10-049 (Short Specs attached) Rated Phase Current: 1 A Phase Current: 5 ? Phase Inductance: 8 mH Measured K_e: 0.02041 (attached file: BMF Parameters) As motor driver we used the EVAL6470H board attached to a STEVAL-PCC009V1 USB-SPI Interface in combination with the dSPIN Evaluation Tool 1.7. Further Parameters: Supply Voltage: 30 V At our tests we tried to do some simple spin-up and down tasks on the motor with a blank axis and getting some experiences with the motor-driver. But we faced several problems at this point: The Motor accelerated at different rates (we tested 2000, 1000, 500, 100 Steps/s�) to different speeds. We tried to get it to as high as about 2000 Steps/s but it always stalled without any external force at about 1500 Steps/s (1/128 micro-stepping). The ''Command Error'' Flag very often was set after setting parameters with the Evaluation Tool. Here our Questions: What could be the reasons the motor stalls at this stepprate and how could we avoid it in a ''real world'' application? Why was the ''Command Error'' set? Is there any possibility of diagnosis? (Cables where really short, the one that was shipped with the STEVAL-PCC009V1, about 10 cm) We really looking forward for your answers and thank you for your efforts in advance! Sincerely yours #stepper-motor-driver #stepper-motor #l6470 0
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答案对人有帮助，有参考价值 0 你好，失速问题可能与共振条件有关。当电动机卸载时，中点共振受到严重刺激，在许多情况下，在电动机轴上增加一个小负载会大大减少共振，使电动机正常运行。您还可以检查BEMF补偿设置的有效性。您应该考虑BEMF补偿工具基于步进电机的近似模型，因此无法返回最佳配置。有关优化电压模式驱动算法的更多详细信息，请阅读以下AN： http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/DM00061093.pdf 通信错误问题应与在不允许（电机运行或桥接器启用）时写入某些配置寄存器的尝试有关。请考虑配置工具始终写入所有配置寄存器，因此为了避免通信错误，您需要将设备切换到高阻抗状态。问候恩里科以上来自于谷歌翻译以下为原文 Hello, The stall issue is probably related to a resonance condition. When the motor is unloded the mid-point resonance are heavily stimulated, in many cases adding a small load at the motor shaft dramatically reduce the resonances allowing the motor to run correctly. You can also check the effectiveness of the BEMF compensation setup. You should consider that the BEMF compensation tool is based on an approximated model of the stepper motor, so it could not returns the optimal configuration. You can read the following AN for further details about the optimization of the voltage mode driving algorithm: http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/DM00061093.pdf The communication error issue should be related to an attempt to write some configuration registers when it is not allowed (motor running or bridges enabled). Please consider that the configuration tool always write all the configuration register, so in order to avoid the communication error you need to switch the device in high impedance status. Regards Enrico

2018-11-20 10:36:25 评论举报刘璐