Implementing a lead compensator on DC motor control using NI myRIO and LabVIEW

[The_Mastermind]

Hi everyone,

I am currently working on a university project that involves using the NI myRIO to interface with real hardware, and I need some assistance with implementing a lead compensator ( PID controller would be fine too but a lead compensator is preferred). I have already derived the transfer function for the lead compensator, but I am not entirely sure how to implement it. While I am familiar with the Control and Simulation Toolkit, my supervisor has instructed me to use either a Formula Node or a MathScript Node instead. Any examples on how to correctly implement the compensator on the actual hardware would be greatly appreciated.

Thank you.

[Bob_Schor]

Try doing a Web search using the terms "myRIO" and "Lead compensator".  Speaking for myself, I prefer using LabVIEW functions to "scripting".

Bob Schor

[The_Mastermind]

Hey Bob,

Thank you for your response.

I tried searching online but there was nothing I could find regarding this. Would you have any links/examples for me to refer?

Thank you.

[GerdW]

Hi Mind,

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@The_Mastermind wrote:

I tried searching online but there was nothing I could find regarding this. Would you have any links/examples for me to refer?

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I also searched for "lead compensator implementation" and found links using Google. (They described code for other programming environments, but that should be NO problem.)

I guess you need to search better…

[Bob_Schor]

If you reverse the order of the Search terms (start with Lead Compensator), it should lead you to the LabVIEW Forums 8 years ago.

Bob Schor

[The_Mastermind]

Hey everyone,

I finally figured out how to implement a lead compensator and wanted to share the process for anyone who needs it.

Here’s how I did it:

1. I used the Control and Simulation Loop along with the Transfer Function block (Control and Simulation > Continuous Linear Systems > Transfer Function) to implement the lead compensator (alternatively Zero-Pole-Gain block can also be used).

2. The angle difference was used as the input to the lead compensator, and the output gives the corresponding duty cycle.

3. I then used the Numeric palette to scale the duty cycle appropriately (typically between 0 and 1, depending on how your PWM works)

Hope this helps!

Thank you Bob_Schor and GerdW for your assistance.