Current reading problem in 6.4.0

[TKara.2]

[PN]: Custom Board

[VERSION]: 6.4.0 [TOOL]: MC WB

[DETAILS]: I am using a custom board with a single shunt current sensing topology. However, in the Motor Control Workbench (MC WB), I cannot enable the "Current Reading" configuration option. I have seen that in ST evaluation boards, such as those with single shunt implementations, this option can be enabled without issue. I expect the same functionality to be available on custom boards as well.

[EXPECTED BEHAVIOR]: "Current Reading" settings should be configurable when a single shunt topology is used, as is the case with ST’s own boards. I expect to be able to enable this section in the tool for my configuration.

[HOW TO REPRODUCE]: Create a new project in MC Workbench v6.4.0. Select "Custom Board" and configure it with a single shunt current sensing topology. Try to access and enable the "Current Reading" configuration tab. Observe that this option is grayed out or inaccessible, even though it should be available for single shunt setups.

 

[TKara.2]

I found that the issue was caused by the offset present in my current sensing circuit. Will there be an option to support three-shunt or single-shunt with offset configurations in future versions?

[cedric H]

Hello @TKara.2 ,

"Current reading" for 6-step implementation samples only positive current that's why there is no need to introduce an offset in your current sensing circuit. Offset configuration is already available for both single shunt or three shunts but are dedicated to FOC algorithm where you need to sample positive and negative current.

Regards

Cedric