Measuring a DC motor's inductance

[bbq_build]

Hello, on the internet, there are various methods on measuring the inductance. For example,

http://www.dos4ever.com/inductor/inductor.html and
https://electronics.stackexchange.c...y-way-to-measure-a-dc-hobby-motors-inductance

If I want to measure the inductance of a 12V DC motor, are the two methods listed above as good as using a LCR meter? Will LCR meter be able to get more noticeably accurate measurements?

 

[Windadct]

In general - a dedicated instrument will yield better results when used within it's limits ( and more consistent). But to measure a hobby motor, doing the experimental approach, using the techniques would be more educational. Given the two methods I would be tempted to do both and see how close they come out.

If you have access to an LCR meter, it would of course be faster, more convenient.

 

[Hesch]

If I want to measure the inductance of a 12V DC motor . . . .

Why do you want to measure? What's the purpose?

Say you going to make a digital controller for this motor. Having measured L and R, you will have to z-transform a transfer function, taking calculation time delay in the controller into consideration, and so on. If that's the case, there is smarter way, measuring the z-transformed of the transfer function directly.

Please respond if interested.

 

[Jafaru]

Why do you want to measure? What's the purpose?

Say you going to make a digital controller for this motor. Having measured L and R, you will have to z-transform a transfer function, taking calculation time delay in the controller into consideration, and so on. If that's the case, there is smarter way, measuring the z-transformed of the transfer function directly.

Please respond if interested.

Please, I'm currently working on a project on centrifuge modeling, and my supervisor has mentioned to me, what you are saying on converting the open-loop transfer function to z transforms. Can you kindly shed light on 'why' the transfer function should be converted to z transforms? Or I'll appreciate if
you can refer me to any material that'd be of help. Thanks