[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Current Limiting and Impedence



Original poster: Harvey Norris <harvich@xxxxxxxxx>


--- Tesla list <tesla@xxxxxxxxxx> wrote: Just a possible application for gapped ferromagnetic inductors... A pole face rotor (DC field) from a large alternator has appreciable gaps, The NS pole faces with flux leakage at the gap weave in a zig zag pattern; but the metal is not segmented silicone iron like that of a transformer. One would probably need to add a section with thicker wire in parallel to the existant finer windings of the electromagnet. If the pole face rotor in of itself does not offer enough inductance, it could be reinserted into the alternator stator ring assembly which reduces the air gap considerably. If this offers too much inductance, one could start shorting out each of the three phases to reduce that inductance... Probably a silly idea, dont know if it is practical. As a further experimental modification you might decide to spin the AC pole face assembly and ballast the cuurent through the fields slip rings. With a DC field,it shouldnt take much spin to create 60 hz on the stator outputs, a typical car alternator has 7 pole faces per side, creating 7 cycles per revolution. But here we are instead inputing 60 hz AC into the field. Normally the alternator is designed as an instrument to translate DC into AC by motional emf, but if we instead inputed AC into the field, then it becomes a combination of both motional emf and time varying emf, as the transformer model works only with time varying emf, and not motional emf. By precise control of the field rpm it might be possible to create a pulsed DC output on one of the three stator phases. This would be a sort of double negative principle, to time the rpm of the field rotor so that when the stator output normally reverses polarity, instead the field reverses polarity, and thus the stator output instead puts out an identical polarity pulse. HDN