What is the differnce between a transformer having ferrite core and another transformer without any core (air core transformer).How these two affects the output power and leakage flux??
The main reasons ferrite cores are used are: -
- They contain the magnetic field better than air preventing coupling to other circuits
- Higher value inductances can be made with much less copper - trading off copper loss with core loss gives the designer more options.
- Coupling of two or more windings is more effective (should this be required)
- Ferrite solutions (when applicable) are usually physically smaller than air.
The main reasons ferrite cores are not used are: -
- Permeability drifts with temperature hence air cored inductors are more stable in some applications
- Air cores don't saturate and produce 3rd order harmonics like ferrite. Useful, unless you are designing a saturable reactor of course.
- For tuned circuits in the VHF and above, ferrites are too lossy in some applications.
These are the main pros and cons.
Consider the two scenarios.
Without a core, the magnetic field strength is determined by #loops and the current (And many other factors - shape, design, resistance, but we're assuming they're identical for both transformers)
With a ferromagnetic core (Like e.g. Ferrite), applying a magnetic field will induce magnetism in the core, which will increase the magnetic field strength, which will induce magnetism in the core, which will...
As such, you can get a higher field strength from the same current with a ferromagnetic core.
protected by Kortuk Jun 18 '13 at 13:31
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