Inductive Power Coupling

[l8mackey]

Does anyone know of any papers, etc on inductive power coupling. We are looking at the feasibility of transmitting power in the 10's or 100's of KW without a direct connection.

I have seen papers, etc on doing this at much lower power levels and recall that it is not that efficient.

Wondering if anyone has done anything at higher power levels.

 

[dpc]

That covers a lot of ground. A transformer uses inductive coupling. If you are talking about something with large air gap, or an air core, losses will be high.

Can you provide something more specific on what you are thinking about?

David Castor

http://www.cvoes.com

 

[pwrtran]

Tesla coil...?

 

[ScottyUK]

I worked on a fairly high power "contactless energy transfer system" at ERA Technology back in the 1990s. If you wanted to contact them, it was developed by the staff of BC84 under Don Pedder's leadership. We could transmit perhaps 10kW across a 1/2" air gap. The prototype had a fairly large external magnetic field due to flux leakage, although it could certainly have been refined to improve this. I also played with a little version which we applied to compact fluorescent lamps so both the lamp and housing could be fully encapsulated and without metallic contacts. That was a nice little design.

It looks like Don has also had something published:

http://ieeexplore.ieee.org/Xplore/l...0744372.pdf?arnumber=744372&authDecision=-203

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If we learn from our mistakes I'm getting a great education!

 

[mgtrp]

Inductive power transfer allows transfer across very short distances. Look up John Boys and Grant Covic of the University of Auckland, they have been involved with numerous papers on the subject, and commercial implementation of this technology in the power ranges you are talking about (you don't say how far you want to send it though).

 

[l8mackey]

Thanks to all, so much for IEEE's new website. I did several searches on Explorer and Don's paper did not come up.

I just reran the searches with Don's title and his paper came up as well as some Grant Covic papers.

That is enough to get me going in a direction.

We had figured that the bigger the gap on the transformer the more inefficent but did not have any realistic numbers to compare to the analysis.

THe fact they were getting efficiencies into the 80-90% range is encouraging.