Project Journals > Bryan

2hp Motor Conversion

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oztules:
"P.S. Tom it was a while ago but one would have to say as it took a couple of months to make probably close to a pallet of beer was consumed in the making........"

Does this mean the cost of the motor , magnets and machining........ pale into insignificance in the total cost benefit equations?

Artv.
In the original windings, the slot length and the loop length (joining the wires in the slots)can be of equivalent length in the outer concentric coils. Going to closer slot geometry helps get the wire resistance down as well (shorter loop ends)..... however in this type of alternator, it will be the armature reactance that will probably determine the upper current limit.
If it were only resistance they wouldn't just run away under short circuit  high wind conditions...... they'd burn up instead.

The coil span should be the same as the magnet span. In this case 2" or so.

The flux linking the coils will be governed also by the magnet strength, proximity to the core and the resultant reactance too. As the reactance increases, it tries to mess up the incident flux, and so weakens it's effect. This flux .... no longer linking the coils is leakage, and the flux will take some other path home rather than the circuit we designed for it.



..................oztules

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