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Fw: [DPRG] Electric speed control for RC car (long!)

Subject: Fw: [DPRG] Electric speed control for RC car (long!)
From: Ralph Tenny rten at metronet.com
Date: Wed Aug 9 15:43:59 CDT 2000

> >Running at low speeds means a lot of current-chopping
> >on the part of the controller.  This translates into a
> >lot of switching, and a lot of heat.  Make sure your
> >unit has a lot of heat sink area, or maybe look at
> >addding one of your own.

If the chopper circuitry is properly designed, the FETs will either be
full on or full off, zero dissipation in either case at low-to-medium
switching frequencies. A high-frequency chopper will have higher losses
when the turn-on and turn-off times for the chopper devices become an
appreciable portion of the chopping cycle.

The bottom line is that, with appropriate chopping speed, the chopper
dissipation should be low. You still need a heat sink in case of
accidental short-circuits.

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