Hi, I Use NUCLEOF446RE and X-NUCLEO-IHM08M1 for running a motor. It works for a motor with 24V power supply. But however, if I use 36V power supply and run motor profiler to estimate the parameters. It fails to rotate. Need Suggestions?

[VGani.1]

When Motor profiler is used to test the motor for its parameters, it keeps on checking with the possible current (18A, 14A, 9A, 6A, etc..). After sometime a message popup "Speed measurement takes too long time". I don't know the reason behind this. If same motor is used with 24V power supply, motor profiler works and able to run the motor using motor control workbench.

[cedric H]

Hello,

For safety purpose the Over voltage protection of this board is set at 36V in the profiler code. So I guess you reach an over voltage error as soon as the profiler start. Unfortunately, the error is not well reported in the profiler tool. A redesign from scratch of the profiler tool is ongoing and will fix this kind of issue.

Regards

Cedric

[VGani.1]

Hi Cedric,

When can we get the updated profiler to test the motor with higher voltages (36V)?

[cedric H]

Hello,

It is not planed to increase the voltage protection threshold.

Motor's parameters guessed by the profiler are not dependent on the voltage, so there is no issue to import your profiling results in the workbench and changing your Nominal DC voltage afterward.

Regards

Cedric

[VGani.1]

Thank you for the response

[VGani.1]

Yes I tried with changing nominal DC voltage (36V), but when click on start motor, over current fault occurs. Any Suggestions?

[cedric H]

So if I understand correctly, you are able to control your motor when you use the profiler code with a Vbus at 24V.

When you generate a project with your profiled motor, it works at 24 Volts, but you have an over current at 36 V.

Is it correct ?

Regards

Cedric

[VGani.1]

Hi Cedric,

Yes exactly this is my situation.

[cedric H]

Ok,

So I would try first to decrease the current during the start-up phase.

These settings are accessible by clicking on the blue rectangle "Firmware Drive Management" -> Start-up parameters.

Regards

Cedric.

[VGani.1]

Hi Cedric,

Yes I tried using Start-up parameters and even reduce current ramp ( final current ramp as 2A and current ramp final as 4A )compared to the 24v (6A and 8A). but still the fault exists (over current detection) in monitor screen when click "Start Motor".

[Ondrej HOLY]

Hello.

1)

You have to have in mind that the FW for Motor Profiler (MP) is a bit specific and it is a bit difficult to prepare it for all kinds of motors.

I recommend to you reduce the used current for profiling and fit relevant maximum speed of motor.

The MP use this two values (Current and speed) and generate a start-up ramp for motor acceleration. If MP detect Over Current or not successful start-up then it change them and try the start again. It is pre programed in a steps, but you can find direct condition what can be better.

2)

The standard FOC FW use the current controllers. It provide to motor only requested current what is limited by a current selected as a motor maximum. You can modify it.

I do not see any problem to used this HW setup (NUCLEOF446RE + X-NUCLEO-IHM08M1) with MC Workbench at 36V or a bit more. The limit of Power Board 48V is a real limit of embedded components an it is not recommended to run motor at 48V. You have to be careful when you will use motor with big inertia or feature flux weakening to do not destroy power board during braking (loosing of control) to do not overstress power board by high B-emf voltage.

I am not sure what motor parameters are. For example low inductance and / or resistance motor can generate big current peaks during connecting. If motor has big inertia then it request high torque (current) for start-up, but if it is not possible to provide it by Power Board or if it not accepted by motor due to high resistance or inductance then start-up must be longer with slower acceleration ramp.

Have a nice day, Ondrej

[VGani.1]

Hi @cedric H​ ,

Has the limit been increased ?? Because we need to test the motor at 36V. So we need to estimate the parameters using motor profiler which is previously not working at 36V