MCF8316AEVM: MCF8316使用时，电机如何正常运行？需要注意什么？

问题1：如何使用MPET，我按照如图步骤进行MPET自动提取，但不知从哪里看提取成功，又如何相关写入寄存器。

问题2：为什么通过I2C控制速度后，运行了，但又会自动停止，而且不报错？停止后电流降低，有时候也不降低？

Cherry Zhou：

您好，

能否分享下您参考的以上截图的出处？

,

lian xu：

www.ti.com.cn/…/zhcu983a.pdf

,

Cherry Zhou：

好的，您的问题我们需要升级到英文论坛看下，有答复尽快给到您。

,

Cherry Zhou：

您好，

lian xu said:问题1：如何使用MPET，我按照如图步骤进行MPET自动提取，但不知从哪里看提取成功，又如何相关写入寄存器。

MPET 遵循下图中的逻辑： 

所以您可以看到您在第4.3.1节中执行的步骤手动命令 MPET 启动并完成每个阶段。 假设您在使用 GUI，您可以判断 MPET 何时完成，来查看相关常量在寄存器映射中是否具有非零值(例如 CLOSED_LOOP2寄存器中的 MOTOR_RES 和 MOTOR_IND)。 此外，电机应停止旋转(如果目标速度为零)。

要将 MPET 值写入相关寄存器，请将 ALGO_CTRL2寄存器中的 MPET_WRITE_SHADW 设置为1。 为了保存这些值以使它们在电源循环后出现，随后单击"Write to EEPROM"。 

lian xu said:问题2：为什么通过I2C控制速度后，运行了，但又会自动停止，而且不报错？停止后电流降低，有时候也不降低？

在在电机运行期间，是否enable了任何 Auto Read 按钮？ 该问题可能与以下FAQ中的issue8 相关：

https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1066777/faq-production-device-information

该问题可以通过在运行期间不读取寄存器来避免。 

,

lian xu：

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})('v_4ae6bf4f09ff48a4a3bf45b84e095f00');你好，我现在存在的问题是：1.用I2C控制速度有时候不启动，有时候能启动，但启动还分两种，一种正常启动，一种启动大电流就停止？2.输入电压在12v时还有可能启动，在24v的时候就不启动，但是电流还在升，电机有响声，就是不转？帮我看看配置有什么问题？谢谢！

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,

Annie Liu：

我请产品工程师帮忙再看看，预计下周给您回复。

,

Annie Liu：

1. 你的意思是当你使用I2C调速时，电机可以正常启动，但有时会停止？在这种情况下你能读出故障吗？

2. 电流会停止上升吗？如果电机不旋转，则应该存在故障，导致设备停止运行。

,

lian xu：

1.使用I2C时有时候能正常启动；有时候不动；有时候会很有很大的电流，像是有什么力量拉着他，不让他动，3s后就停止掉了；2.不知道电流是否会停止，因为电流一直升，所以我就关闭电源了；3.读取故障读不到；4.电机是好的，在电机提供的开发板上转动是没有问题的。

,

Cherry Zhou：

 您好，

lian xu said:有时候会很有很大的电流，像是有什么力量拉着他，不让他动，3s后就停止掉了；

当您提到拉力时，是否意味着电流好像在毫无理由地无限增加？

当您说不让他动时，是指器件不运行吗？还是说关闭器件吗？

3s后停止，您是指电流停止吗？ 根据您之前的描述，电流似乎在上升。