Coil Inductance

[Burnit]

I have an AC circuit that pulses a coil for an experiment, the circuit is sensitive to the inductance of the coil & has a small range in which it will work, outside & either side of this range it refuses to work.

I want to increase the Flux density of the coil but working within this small range of inductance measure is preventing me from doing this.

My question is, WITHOUT changing the circuit at all, is there a way that i can get this particular circuit to drive a coil with more turns of wire to increase the flux density as needed?
Can i add something to the coils or near the coils to do this?

 

[waross]

For a DC application;
Increasing the number of turns will increase the inductance but will not increase the amp turns or the magnetic flux.
For an AC application;
Increasing the number of turns will increase the induction and the inductive reactance. The increased inductive reactance will increase the impedance disproportionately to the increased resistance and result in less amp turns and less magnetic flux.
Try increasing or varying the voltage. That is quicker and easier than redesigning the coils with larger wire.

At first it seems counter intuitive but consider, if you double the number of turns, you double the resistance. Twice the turns times half the current equals the same number of amp turns. For more amp turns use a larger gage wire or split the winding and connect both parts in parallel.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[flexoprinting]

Hi waross

Is it possible the OP has excessive leakage flux due to the type of core material? I am not sure why the OP wants to "increase flux density" but could an iron core or some other low reluctance substance be used to achieve this?

 

[waross]

Possibly the Original Poster will give us some more information on his application. There is not much more to say without a lot more detail.
Fewer turns of a heavier wire will give more amp turns and less inductance. It may also burn out the driving circuit.

flexoprinting; You may be right, but with the information at hand, who knows??

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[Warpspeed]

If you want more flux density with the same inductance, you really need less turns and a higher permeability magnetic path.

 

[LionelHutz]

If the circuit is really fussy about the coil then there's probably not much you can do.