finding transfer function of voice coil motor

[ravi18]

how can we find transfer function of voice coil motor using control and simulation module in labview.

[Bob_Schor]

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@ravi18 wrote:

how can we find transfer function of voice coil motor using control and simulation module in labview.

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That's a pretty open-ended question.  Are you talking about experimentally determining the transfer function?  Do you understand enough Signal Theory to be able to design an appropriate Input/Output Test and Measurement framework that will let you empirically determine the Transfer Function?  Are sinusoids an appropriate Stimulus?  Do you want to determine it from a Step Response?

On the other hand, you may already have data (we don't know, you didn't say) and need advice on how to process it.

You are asking in a LabVIEW Forum.  Are you quite familiar with LabVIEW, or do you need to learn LabVIEW first?  If so, I recommend spending a few weeks or (better) months learning LabVIEW, particularly with someone to guide and mentor you, before tackling a "Real-World" problem such as this one.

Bob Schor

[ravi18]

Hi Bob

I am not a pro in labview, but as I think we can generate varying input output signal and using FRF function we can generate Bode plot, and using that Bode plot we can creat a transfer function of Voice coil motor. All these things I wanted to do with practical experimentation only.

Do u think these idea of finding TF will work?

[Bob_Schor]

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@ravi18 wrote:

Hi Bob

I am not a pro in labview, but as I think we can generate varying input output signal and using FRF function we can generate Bode plot, and using that Bode plot we can creat a transfer function of Voice coil motor. All these things I wanted to do with practical experimentation only.

Do u think these idea of finding TF will work?

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• What signal are you planning to generate?  Specify it as completely as "necessary".  
• What hardware will you use to generate the signal?  Is this hardware also capable of driving the voice coil motor?  [I'm not sure I know what a "voice coil motor" signifies.]
• What response are you planning to measure?  What hardware will you use to acquire this response?
• I'm sure you know that a Transfer Function involves frequency.  Part of the first point above involves the frequency content of your stimulus (are you going to use single frequencies one at a time, what range, what intervals), and the just-previous point involves the frequency content of the expected response, and how you handle that.
• Not being an engineer (electrical or otherwise), I have no idea what an FRF Function is, nor how you use it to generate a Bode Plot.  Hmm, could FRF mean "Frequency Response Function", so an FRF Function would be a "Frequency Response Function Function" (or is that just silly)?

Bob Schor