PMLSM Modeling cogging forces

Is there a way to modify the PMLSM Simscape block so that it accurately models cogging forces?

Answer 1

[Aditya]

Hi John ,

The built-in PMLSM (Permanent Magnet Linear Synchronous Machine) block in Simscape does not natively model cogging forces. However, you can extend its behavior by adding a custom force component to represent cogging.How to Model Cogging Force in Simscape

1. Use an External Force Source

• Add a Simscape "Translational Force Source" block to your mechanical translational network.
• Connect the force source in series with the mover of the PMLSM.
• Drive the force input of the source with a function that models the cogging force as a function of mover position.

2.Custom Simscape Component

If you want to encapsulate this in a single block, you can write a custom Simscape component using the Simscape language.Sample code :

component CoggingForce
  nodes
    p = foundation.mechanical.translational.translational; % positive
    c = foundation.mechanical.translational.translational; % case
  end
  parameters
    A = {1, 'N'};   % amplitude
    Np = 6;         % number of periods
    tau = {0.01, 'm'}; % pole pitch
  end
  variables
    x = {0, 'm'};   % position
    F = {0, 'N'};   % force
  end
  equations
    x == p.x - c.x;
    F == A * sin(Np * 2*pi*x/tau);
    p.f + F == 0;
    c.f - F == 0;
  end
end

• Connect this block in series with the mover port of the PMLSM.

You can refer to the following documentation for more details:

https://www.mathworks.com/help/simscape/lang/creating-custom-components.html