How Do You Calculate the Opposing Force in a Linear Generator Design?

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The discussion centers on the feasibility of a linear generator design that utilizes a spring and a control circuit to regulate the rotor's magnetic field for braking, which induces electromotive force (emf) in the stator. The main inquiry is about calculating the opposing force that arises from Lenz's law and how this relates to the applied magnetic field in the rotor. Additionally, there is a question regarding whether the variable induced emf generated during braking can be considered useful energy or if it diminishes the generator's efficiency. Understanding these dynamics is crucial for optimizing the design and functionality of the linear generator. The conversation highlights the need for clarity on the relationship between induced emf and the efficiency of energy conversion in such systems.
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Hi
I have project that build on a linear generator design.
The design is:
A linear generator is attached to a spring, and with help of a control circuit are the magnetic field of the "rotor" regulated to "brake" the applied force (and the braking creates induced emf in the "stator"). The same happens with the force from the spring on the return motion.

Is this design possible? I have read about Lenz law on the web and understand that it describe the "force" that oppose the motion, but how is the calculation this "force"?
Will all(except the normal losses due to bearings, friction etc) the induced emf from the "braking" be useful energy?

Jorgen from Norway
 

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jjjj said:
Hi
I have project that build on a linear generator design.
The design is:
A linear generator is attached to a spring, and with help of a control circuit are the magnetic field of the "rotor" regulated to "brake" the applied force (and the braking creates induced emf in the "stator"). The same happens with the force from the spring on the return motion.

Is this design possible? I have read about Lenz law on the web and understand that it describe the "force" that oppose the motion, but how is the calculation this "force"?
Will all(except the normal losses due to bearings, friction etc) the induced emf from the "braking" be useful energy?

Jorgen from Norway

Welcome to the PF. Do any of the "Related Threads" listed at the bottom of this page help?
 
berkeman said:
Welcome to the PF. Do any of the "Related Threads" listed at the bottom of this page help?

Hi
Thanks. No one of the related threads are what I am looking for. I need help to understand the calculation of the "force" who is working against the motion, and as I can understand comes from a dipole effect in the "stator" coil due to the induced current in this. But how to relate this "force" to the applied magnetic field in the "rotor"(for control issues). Another question is;will the variable induced emf which come from the controlled magnetic field be usefull energy? or will the efficiency of the generator be reduced?

Jorgen
 

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