Chapter: Electrical machines : Electromechanical Energy Conversion and Concepts in Rotating Machines
The Co Energy
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.
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:
Wfld+W’fld=λi
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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Electrical machines : Electromechanical Energy Conversion and Concepts in Rotating Machines : The Co Energy |
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Electrical machines : Electromechanical Energy Conversion and Concepts in Rotating Machines