position control randomly stopped working

[msingh]

Hi,

I had successfully created a project using the AN5464 application note using the following hardware:

• NUCLEO-F303RE
• X-NUCLEO-IHM08M1

I have create the project using MotorControl Workbench 5.4.4 and managed to achieve rotation on the motor, however this doesn't seem to be a reliable code, it works for a while and then suddenly stops working, I have debugged the code and I have realised that it never goes beyond the "while(MC_GetAlignmentStatusMotor1()!=TC_ALIGNMENT_COMPLETED){}" eventhough it has worked for the past week! I have also noticed the motor doesn't take any current (0.01A) which means it doesn't even try to move if I don't power the microcontroller but only the ihm08m1 board it takes 0.04A when I plug in the microcontroller it goes down to 0.01A. Previously it was using 0.045A - 0.4A of current while driving the motor and 0.45A when in locked rotor mode. I cannot understand why did it suddenly stop?! I have checked the encoder and all 3 channels work fine. any help is much appreciated.

Kind regards

Manpreet Singh

[Laurent Ca...]

Dear @msingh​ 

You wrote " it works for a while and then suddenly stops working".

By that, do you mean that it is a regular behavior (systematically this is what happens) or do you mean that it works for several weeks and suddenly it does not work at all?

Best regards

Laurent Ca...

[msingh]

It doesn't work at all now!!! According to the application note AN5464 the "MC_startMoro1" is supposed to "performs an auto-start of the driving with both the encoder alignment procedure and the encoder zero reset" however nothing is actually moving and then obviously the code remains stuck in the" while(MC_GetAlignmentStatusMotor1()!=TC_ALIGNMENT_COMPLETED){} ". This was all working yesterday and this morning nothing works I am really confused about what's going on here.

[Laurent Ca...]

Dear @msingh​ 

If you haven't changed the code, and if it worked for a while and suddenly it doesn't work at all, then you probably have an HW problem.

Therefor I suggest you to:

• 1. check your connections
• 2. check your power board
• 3. and check your motor (by the way,what is the motor you use?)

Best regards

Laurent Ca...

[msingh]

I had tried to implement the printf function which is when I noticed this issue. Then, I went back to the previous version of the code and it still didn't work.

1) Connections are fine

2) I checked some voltages according to the ihm08m1 schematic and it looks good.

3) Maxon EC-I 40 50 Watt

[Laurent Ca...]

Dear @msingh​ 

And did you check your motor is still working and with the same characteristics?

Best regards

Laurent ca...

[msingh]

I do not see any PWM signals being generated I'm guessing that's the reason for it not to move? can the debugger configurations affect this? I had changed them to try implement printf. Here's what they look like now.

[msingh]

[msingh]

I had 2 motors, I had tried both of them and them left one on the side. Neither of them works with the set up I have anymore. I can try driving them with the maxon controller but I'm 95% sure they'll both work. If anything was happened yesterday then I'd think the motor is burnt or any other issue but yesterday it was working all good.

[Laurent Ca...]

Dear @msingh (Community Member)​ 

Did you try:

• 1. to come back to the previous configuration of the debugger (just in case of)
• 2. and to run you board without physical connection to the debugger

 ?

Best regards

Laurent ca...