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The Co Energy
The magnetic stored energy is a state function, determined uniquely by the values of the independent state variables λ and x
Coenergy: Here the force can be obtained directly as a function of the current. The selection of energy or coenergy as the state function is purely a matter of convenience.
For a magnetically-linear system, the energy and coenergy (densities) are numerically equal:
The force acts in a direction to decrease the magnetic field stored energy at constant flux or to increase the coenergy at constant current. In a singly-excited device, the force acts to increase the inductance by pulling on members so as to reduce the reluctance of the magnetic path linking the winding.
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