MCSDK 6.4.1. FOC with hall sensor start up issues

[BWI]

Hello,

 

I did a custom design based on EVLSPIN32G4-ACT, schematic is basically the same apart from board shape and connectors.

The hardware is working in general, I successfully got my BLDC motor without an attached load spinning using sensor less speed feedback.

The application is the drive unit for an radial fan. After attaching the fan impeller to the motor shaft the before working setup would not spin up anymore.

I got speed feedback failures, then I raised the start up current until I got over current events. All not working.

 

The motor also features integrated hall sensors, so I decided to switch to those. The mechanical speed returns sane values inside motor pilot software, so I assume them working.

 

Using the hall sensor, the motor is trying to spin up in the wrong direction finally failing with an speed feedback error.

How ever, if I give the motor a push in the correct direction, it will spin up and then be driven to the max. application speed.  At this point new speed set values are ignored by the firmware until the motor is stopped again.

 

Summary:

- the custom board seems to be working in general

- the motor looks to be connected and setup so it should be working

- after attaching a load, no spin up in sensor less FOC mode (PLL + Cordic)

- hall sensor setting spins up motor in wrong direction, when pushed by hand to correct direction fast spin up to max speed and new set values are ignored until stopped

 

Could you give a hint, how to troubleshoot this?

 

Thanks and best regards

Benjamin

[GMA]

Hello @BWI,

If with load, the motor is not able to spin, it could mean that your selected board does not provide enough power at the beginning. Does Sensor Less RevUp table uses the maximum allowed current?

 

You can also dynamically tune the current target parameter through the Motor Pilot tool in the Rev-up tab.

[BWI]

Hello @GMA ,

 

as I said, I already tried your suggested adjustments in the rev up table until I got overcurrent events.

 

The driver board is very well capable to supply enough power to spin up the motor and to rev up to taget speed as I also mentioned.

My chosen hall sensor approach also does not offer any settings regarding start up current, as this is only available  for the sensor less speed sensing option.

 

My questions:

- why does the motor try to spin up in the wrong direction using hall speed sensing option? This issue persist for both directions

- when motor is spinning up to full speed after getting a push in the correct direction, why are new set values ignored, the firmware does not indicate any errors. The motor pilot software also correctly reports changing set values, how ever they do not get applied.

 

Where do I start to look?

 

[BWI]

Hello GMA,

 

to catch up on this. I got my application to run using the MC SDK 6.4.1. I did make a custom board setup in the MC suite based on the EVLSPIN32G4-ACT.

My code was blocking the CPU under certain conditions after removing those issues it is working for this simple fan application. Nevertheless the overall experience working with the provided tool chain was not that pleasant to me, so I decided to move away from this platform and look somewhere else for future projects

Thanks for your support,

 

Best regards

Benjamin