ST Motor Pilot V6.4 Nominal Current is not following MC Workbench Project current rating

fmariz · ‎2025-07-30

Hello and good day. I am doing a project of running a motor using 6-Step with Hall Sensor.

I am facing an Overcurrent issue while using Motor Pilot V6.4 in 6-Step + Hall Sensor mode. In MC Workbench, the current limit is set to 15A but the Nominal Current is shown as 2.16A in the Motor Pilot GUI. No matter what I do in MC Workbench, the Nominal Current doesn't change and always shows as 2.16A. Consequently, I can't start the motor as it there is always Over Current fault as the motor needs more than 2.16 to start.

I know that it's not a limitation of my Power Board as it is rated at 20A.

In MC Workbench, it's clearly stated 15 Apk is set and is within specification of Power Board.

The strange this is, when I try FOC + Hall Sensor mode, this doesn't happen and the Motor Pilot GUI is showing the correct Nominal Current limit (15A) below. Somehow, this issue only happens in 6-Step + Hall Sensor mode.

May I know why this Nominal Current setting is different between FOC and 6-Step GUI?

Here are the details of the project:

BLDC Motor rating: 15A
Control Board: B-G473E-ZEST1S
Adapter: X-NUCLEO-IHM09M2
Power board: EVALSTDRIVE101
Software: ST MC Workbench v.6.4 and Motor Pilot v6.40

Edit: Added more details

Fabrice LOUBEYRE · ‎2025-07-30

Hi fmariz, I suggest you first to check this post:

hall-sensor-not-working-on-6-4

From my point of view, the problem you raised is only a display issue.

The firmware does not retrieve the current information from the MCSDK Workbench, and it is not displayed on the Motor Pilot (the default value of 2.16 A is shown).

Best regards.

Fabrice