Air-Gap & Wireless Power Transmission Efficiency

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Discussion Overview

The discussion centers around the impact of air-gap distance on the efficiency of wireless power transmission systems, particularly focusing on the optimal distance between coils for effective power transfer. Participants explore various parameters affecting efficiency, including coupling and losses, and consider practical applications in vehicle charging.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • Some participants inquire about how the distance between coils affects efficiency and coupling parameters, questioning the extent of this impact.
  • One participant suggests that a 20m gap is suitable for their project but seeks to understand the implications of reducing the gap to 10m on efficiency and losses.
  • Another participant challenges the suitability of a 20m gap, asking for specific criteria and calculations that support this assessment.
  • Concerns are raised about the feasibility of wireless charging at a 20m distance, with some arguing that practical applications, such as vehicle charging, typically require much smaller gaps (e.g., under 50cm).
  • Participants express interest in understanding the design methods and requirements for optimizing gap distance while considering other parameters.
  • Questions are posed regarding the radius of the coils, the desired power transfer, and the frequency of operation, indicating a need for more detailed specifications.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the optimal air-gap distance for wireless power transmission, with multiple competing views regarding the practicality and efficiency of various distances. The discussion remains unresolved with ongoing inquiries and challenges to earlier claims.

Contextual Notes

Limitations include a lack of specific numerical data to support claims, dependence on assumptions about coil geometry and power requirements, and unresolved questions about the accuracy of assessments made regarding efficiency at different air gaps.

Fatima Hasan
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Summary:: How does the air-gap affect the efficiency ?

For a wireless power transmission system, to what extend does the efficiency and coupling parameters get affected by the distance between the coils?
What can be done to increase the power transmission or efficiency regardless of the value of air gap?

[Thread moved from the technical forums, so no Homework Template is shown]
 
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What are your thoughts? And is this question also for schoolwork?
 
berkeman said:
What are your thoughts? And is this question also for schoolwork?
It's for a project as well.
I found that the length of the gap between the coils of 20m is suitable, but I'm looking for an optimum gap for the coils. So, I am asking if the length is reduced to 10m, for example, would the difference on the efficiency, the losses, .. be too much? Is it worth it ?
 
Fatima Hasan said:
I found that the length of the gap between the coils of 20m is suitable
By what specific criteria (numbers please) was this assessment reached ?

You may then apply the same criteria to make a new assessment of a different geometry. Numbers (and an assessment of their accuracy) are required.
 
Fatima Hasan said:
I found that the length of the gap between the coils of 20m is suitable, but I'm looking for an optimum gap for the coils. So, I am asking if the length is reduced to 10m, for example, would the difference on the efficiency, the losses, .. be too much?
10-20 meter gap? That seems like an excessive gap to try to trasfer any significant amount of power. Please show your calculations that show that 20m is "suitable".
 
Fatima Hasan said:
I found that the length of the gap between the coils of 20m is suitable, but I'm looking for an optimum gap for the coils. So, I am asking if the length is reduced to 10m, for example, would the difference on the efficiency, the losses, .. be too much? Is it worth it ?

I think it is almost impossible to realize the wireless charging of the vehicle at a distance of 20m between the TX coil and the RX coil. In most cases (from private cars to large trucks), I believe that the distance between the bottom of the vehicle and the ground may not exceed 50 cm. :smile:

Generally speaking, the smaller the gap, we can design a more efficient wireless charging system. If you want to find the best gap distance within the limits of other parameters, I would be curious about this design method and requirement. Hope you can provide more information for reference.
 
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alan123hk said:
I think it is almost impossible to realize the wireless charging of the vehicle at a distance of 20m between the TX coil and the RX coil. In most cases (from private cars to large trucks), I believe that the distance between the bottom of the vehicle and the ground may not exceed 50 cm. :smile:

Generally speaking, the smaller the gap, we can design a more efficient wireless charging system. If you want to find the best gap distance within the limits of other parameters, I would be curious about this design method and requirement. Hope you can provide more information for reference.
I was meant to write "cm" not "m" but I can't edit now.
 
Fatima Hasan said:
I was meant to write "cm" not "m" but I can't edit now.
Ah, that's much better. So with a gap of 10-20cm, what is the radius of the two coils? How much power do you want to transfer? What frequency are you planning on using and why? :smile:
 

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