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pole inductance | 29 comments (29 topical, editorial)
Re: pole inductance (3.00 / 0) (#12)
by Flux on Fri May 16th, 2008 at 10:13:29 AM MST
(User Info)

I can't see what difference it makes whether you take the output from one coil or two. The same load will have the same armature reaction.

It makes a difference if you connect it 3 phase or 6 phase if you rectify it but that is a peculiarity of the rectifier.

The damping cage of a single phase machine primarily prevents the pulsating mmf penetrating the field circuit. For polyphase windings it damps pole swing in paralleled machines and also provides a means of starting synchronous motors.

Not sure what you are trying to do, it must surely be with iron poled machines with small air gaps. Most of these snags vanish with neo with effectively very large air gaps and high coercivity.

Winding 2 coils per pole is not going to solve anything and mutual inductance is a complete red herring.

Flux




Re: pole inductance (3.00 / 0) (#13)
by bob g on Fri May 16th, 2008 at 10:21:58 AM MST
(User Info)

Flux:

so from your comments i am to believe that the mutual inductance of two opposite
wound coils on a single pole will have not adverse effects on the voltage of either coil?

if so, that is the answer to my question :)

yes i am working with a iron core machine, without neos, and tight airgap

thanks

bob g

[ Parent ]



Re: pole inductance (3.00 / 0) (#14)
by Flux on Fri May 16th, 2008 at 10:39:13 AM MST
(User Info)

"so from your comments i am to believe that the mutual inductance of two opposite
wound coils on a single pole will have not adverse effects on the voltage of either coil?"

Basically true. The combined dual coils will be the same as drawing the same load from a single coil. With the dual coil arrangement there will be some change in the voltage of one coil if you remove the load from the other as there will almost certainly be a drop in the loading with one coil disconnected.

flux

[ Parent ]



Re: pole inductance (3.00 / 0) (#15)
by bob g on Fri May 16th, 2008 at 10:48:12 AM MST
(User Info)

Thank you Flux

i would expect some change in output if you drop the load from one coil
but was concerned whether the interaction of the two seperate coild magnetically
would have adverse or cancelling effect.

ok,, now i will start the rewind and see what happens

thanks again one and all

bob g

[ Parent ]



pole inductance | 29 comments (29 topical, 0 editorial)

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