EMALS Modeling

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EMALS Modeling Simulation

• Kinjal Patel

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Topics

• Where we are with the modeling
• Future model implementations
• Example for distributed control structure

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Where we were at the previous review
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Where we are now with the modeling

• Machine modeling
• Converter
• Control

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Machine modeling

• A first version of the modular modeling approach
  is now available
• The modeling approach is based on a physical
  approach we replicate exactly in the model the
  winding structure
• System is designed such that any set of
  independent stator modules can be connected to a
  single slider module

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The current model

• We focused on permanent magnet case. Two
  sub-models are available
• Stator module
• Slider module(Shuttle module)
• You can put together up to twelve stator modules
  together with one slider module

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Stator module
e11(t)
L
R

-
R
e12(t)
L

-
L
R
e34(t)

-
v(t)
F(t)
x(t)
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Calculation of e(t)
Check position
Slider is over
Slider is not over
eij(t)0
Calculate coefficient
Multiply time speed
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Slider module
R
v(t)
F11(t)
R
F12(t)
R
F34(t)
x(t)
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Control

• The control modeling is based on the VTB-Simulink
  interface
• The control algorithms are designed in Simulink,
  then tested and finally compiled for better
  performance
• Modular structure of the motor requires a
  hierarchical structure for the thrust control
• A first experiment of distributed control has
  also been performed

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Control

• Two Level Of Control
• SM(System Manager)
• - Only one thrust control is used
• - It will decide which sections have to activate
  the current control
• HM(Hardware Manager)
• - As many current controllers as the number of
  H bridges are used
• - Receives a current reference and accordingly
  implements the current strategy

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SM Structure
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HM Structure
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Example for Control Structure

• Two-module system with distributed control
  structure
• Two stator sections are connected to one slider
  module and SM and HM are controlling the current.

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Schematic for control structure
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Close view of stator-rotor and switches
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Close view of HM section
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Close View of SM section
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Results
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Results
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Future extensions

• Other kinds of Linear Motor
• Induction motor
• Super-conducting motor
• (Wound-field machine)
• Control Structure
• More Advanced, sensor-less control