Modelling/Simulation of a Linear BLDC motor

[brupet]

Hi,

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

I think the challenge depends on how accurately you want to model the motor. For most controller purposes, it can be modeled as a brushed DC motor. Is this sufficient, or are you attempting a lower level simulation?

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) without 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?

 

[0110alxcpa]

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.