What is the coupling field used between the electrical and mechanical systems in energy conversion devices?

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Magnetic Circuits topics include: Singly exicted magnetic systems and energy conversion principles.   A singly-excited system is one which consists of only one electrically energized coil to produce working magnetic field in the machine or any other electromechanical energy conversion device. Hence, the singly-excited system requires only one electrical input. The principle of electromechanical energy conversion states that when an electric current passes through a conductor in a magnetic field, the conductor moves. This movement can be used to convert electrical energy into mechanical... Show more

What is the coupling field used between the electrical and mechanical systems in energy conversion devices?