×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

obtaining BLDC motor transfer function from measured step response

obtaining BLDC motor transfer function from measured step response

obtaining BLDC motor transfer function from measured step response

(OP)
hello,
I have managed to obtain a measured step response (speed in revs/sec vs time)of a BLDC motor system (motor, driver circuit) and now need to obtain a transfer function in order to design a controller in matlab. Does anybody know how to work out a systems transfer function from a step response?

I have worked out the mathematical model of the motor using the motor parameters and got a transfer function, but i would like to get one for the whole real system.

Any help much appreciated!

RE: obtaining BLDC motor transfer function from measured step response

Since you plan to use MATLAB to design the controller algorithm, I figure you have access to it. The System Identification Toolbox for MATLAB fits your need. The process of system identification uses measured input/output data to determine mathematical models for systems that are too complicated to model from first principles. Step response data can be used with that toolbox.

xnuke
"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: obtaining BLDC motor transfer function from measured step response

You'll also need the drive signal to get a transfer function.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources