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Modelling/Simulation of a Linear BLDC motor

  1. Jul 5, 2012 #1

    I'm trying to implement a complete model of ha Faulhaber Linear BLDC motor with the purpose of derriving a controller suitable for a microcontroller ouputing a PWM voltage. The motor is supposed to move a given load to follow a reference signal.

    Accordingly to https://www.physicsforums.com/showthread.php?t=591062 it might be okay to model the motor as a common brushed DC motor

    Do you have any tips? I have tryed to follow the master thesis by Stefan Baldursson (http://webfiles.portal.chalmers.se/et/MSc/BaldurssonStefanMSc.pdf) with out success. (This motor is however not a linear BLDC)

    Could it be suitable to use a system identification method instead of modelling as proposed in that thesis? the identificatin method would mean that I meassure input vs output of the motor (should it be with or without load?)

    Or is the "brushed DC motor"-solution mentioned above a suitable approach?
  2. jcsd
  3. Jul 6, 2012 #2
    to clarify, you have a motor moving a load following a reference signal...

    1) mechanical system: how is the motor connected to load? how does it move through space? what is its mass?

    2) motor system: (the equ's from the papers) how does voltage and current affect the motor in terms of speed and/ or torque?

    3) control system: what does the voltage reference signal represent? Speed, torque, or position? What voltage or current will you apply in a certain sequence to mimic some movement.
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