ICS gain of ST Motor Workbench

[jhhong]

Posted on May 14, 2018 at 14:21

Hi I have some question about FOC SDK solution of ST.

ST provides workbench tool which is called 'ST Motor Control Workbench' for BLDC motor control application.

User is able to config power stage setting and etc.

In 'Power Stage' section of workbench tool, I can choose how I measure the current of motor phase such as 3sh, 1sh, 2ICS.

If I choose 'Two insulated current sensor', there is only one option. it is ICS gain.

Is it means that '2nd voltage output of Isolated opamp per 1A'?

ex) shunt resistor : 30m ohm

nominal motor phase current : 1A

1st voltage output of isolated opamp(input voltage of opamp) : 30mV

Ideal opamp gain : 8

2nd voltage output of isolted opamp(output voltage of opamp): 240mV

Thus, ICS gain is 0.240V/A

Is it correct?

I reviewed FOC SDK user manual many times, but I didn't find that.

So, please inform to me about that. Thanks.

#ics #foc-sdk

[PBo]

Posted on May 28, 2018 at 15:20

Dear Hong,

Your example is confusing us due to the shunt resistor you are referring together with ICS usage ... 

In the GUI, this ICS gain should be the total (linear) gain used to convert the measured phase current within the ADC voltage range.

Best Regards

[Laurent Ca...]

The question has been moved from the "Motor Control Hardware" section to the "STM32 Motor Control" section (the question is about the STM32 MC SDK). 

Best regards