This lesson covers the concept of non linear magneic systems. The lesson also delves into the rate of change of field energy with respect to time and how it helps derive an expression for the generated forces and torque in the non linear magnetic system. It further discusses the concept of co-energy and how it can be used to derive expressions for mechanical work done in mechanical forces. The lesson concludes with an example of a rotational system where the relationship between field energy and co-energy is described in a non-linear manner.

- The field energy can be expressed in terms of the excitation systems present, whether it's a single coil or multiple coils.
- The rate of change of field energy with respect to time helps derive an expression for the generated forces in the electromechanical system.
- The concept of co-energy is useful in deriving expressions for mechanical work done in mechanical forces.
- In a linear system, the force can be evaluated as the rate of change of field while keeping the flux linkage fixed.
- In a non-linear system, the force can be evaluated as the rate of change of co-energy while keeping current constant.

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