Peakfoto Digital Photo Still n Video wrote:
For the pack as a whole, you can use your car's motor controller as an
adjustable resistor. It can drive a resistive load just as well as an
inductive load (the motor). Disconnect the motor, and connect your load
resistor in its place. Use the throttle to control the battery current.
This has the advantage that your contactors, fuses, and meters are all
in the circuit.
what about a resitor /s for an ac motor controlling circut?
you'd have to have 3 ?
Yes, for a 3-phase AC motor controller you'd need 3 load resistors.
Note that DC motor controllers are pretty "laid back" about the load
they will drive. You can put any motor on any controller, and it won't
care (beyond its normal current and voltage limits).
An EV AC motor controller is typically matched to its motor. It will
probably complain and refuse to work with a resistive load. However,
industrial 3-phase AC motor controllers don't care. I've tested them
before with resistive loads when a motor wasn't handy.
--
Any intelligent fool can make things bigger, more complex, and more
violent. It takes a touch of genius, and a lot of courage, to move
in the opposite direction. -- Albert Einstein
--
Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm
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