LC resonance with high Q factor, Inductor with non magnetic core

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Discussion Overview

The discussion revolves around the possibility of achieving LC resonance with a high Q factor in a circuit that includes an inductor with a non-magnetic core and an air gap. Participants explore the implications of eddy currents in the solid metal core and how these factors influence resonance in both series and parallel LC circuits.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Exploratory

Main Points Raised

  • Some participants propose that achieving high Q factor resonance is unlikely due to significant eddy current heating in the core, which would dissipate energy.
  • Others argue that it may be possible to design the circuit to achieve a Q factor of 20 or higher, depending on the dimensions of the coil and core, as well as the values of capacitance and frequency.
  • A participant questions the relevance of the Q factor and seeks clarification on the specific design parameters that could influence it.
  • There is a repeated inquiry about whether certain values of capacitance and frequency could allow for resonance with a Q above 20 in the given LC circuit.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of achieving a high Q factor in the described LC circuit, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

The discussion includes assumptions about the definitions of high Q factor and the specific design parameters of the inductor and capacitor, which are not fully detailed. The impact of eddy currents on performance is also a point of contention.

StoyanNikolov
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TL;DR
Lc resonance with high Q factor. Inductor with non magnetic core and air gap
Consider Inductor with air gap and solid metal core made from material with relative magnetic permeability 1 regardless of temperature (such as copper or aluminium).
There is Air gap between coil and metal core

IMG-46115e6ae36f891ba72366ded3739868-V.jpg
Please Also consider Eddy currents in the solid metal core.
The Inductor is connected with capacitor in

Series LC circuit

Parallel LC circuit

Is it possible under certain values of frequency and capacitance to obtain lc resonance with high q factor?
 
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StoyanNikolov said:
TL;DR Summary: Lc resonance with high Q factor. Inductor with non magnetic core and air gap

Is it possible under certain values of frequency and capacitance to obtain lc resonance with high q factor?
No. The eddy current heating of the core will be significant, and so will preclude a high Q. But then your definition of high Q may be different from mine.

An LC tank circuit could be driven to oscillate at its resonant frequency, but the active oscillator element would need to make up the energy lost to the eddy currents in the core.
 
Baluncore said:
No. The eddy current heating of the core will be significant, and so will preclude a high Q. But then your definition of high Q may be different from mine.

An LC tank circuit could be driven to oscillate at its resonant frequency, but the active oscillator element would need to make up the energy lost to the eddy currents in the core.
Let's say Is it possible with certain values of Capacitance and Frequency to obtain Resonance with Q above 20 for the given LC Circuit?
 
StoyanNikolov said:
Let's say Is it possible with certain values of Capacitance and Frequency to obtain Resonance with Q above 20 for the given LC Circuit?
Why would you say that?
You could design it to have a Q of 20.
What are the dimensions of the coil and the core?
Why is Q relevant?
 
Baluncore said:
Why would you say that?
You could design it to have a Q of 20.
What are the dimensions of the coil and the core?
Why is Q relevant?
With current Inductor with Solid Metal Core and the Eddy currents. Is it possible to have Q above 20. Inductor(with solid metal core) , Values of Capacitance of the Capacitor (Switched in Parallel or in Series) and input Frequency
 
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