>If you connect a dc motor to a battery the initial current will be
>considerable but as it comes up to speed the current required greatly
>diminishes.
Called EMF. To start any mass rotating from zero takes acceleration
which requires energy. Once the shaft is rotating at a constant speed,
the amount of energy required is minimal just to overcome frictional
rotation, hystersis losses, leakage currents, heating, and coupling
efficiency (mutual inductance's if you will) of the magnetic fields.
>If the motor is connected to any degree of mass it will continue to spin
>when disconnected from the battery, and since every motor is also a
>generator as well, the output can be measured and the difference is what
>must be made up to charge the batteries.
Connecting a mass will also require more energy to start it rotating
and this extra mass once running at a constant velocity will have
a higher kinetic energy as in -> (.5mV^2). More mass.. more energy.
Now disconnecting the "motor", yes the shaft will still rotate but
it is using up that "stored" kinetic energy to 'charge' whatever it
is your charging. However, ONLY the energy you put in, will be coming
out.. and not 100% efficient; Again due to losses.
>Ecklin generators typically have very low drag or counter EMF
>resistances and should perform very well with this system. output will
>be small however, it should be able to reach long term charging of the
>battery which can be used as a surge bottle in effect. Thank you John
>Bedini! Just another nut from Alaska.
Ecklin generators are terribly inefficient. Seen any on the market?
v/r Ken Carrigan