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Dynamic Braking Question

2810 Views 22 Replies 12 Participants Last post by  compound_goose
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When the slot car does dynamic breaking in what direction does the power attempt to travel? Does the power go the same direction as the current which came from the power supply OR does the power attempt to go the reverse direction? I would guess the reverse direction since there are brake light system which only light based upon the direction power travels through a diode?

Thanks VERY much!!

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When you release the trigger of the controller (with brakes), instead of a reverse current being fed into the track (Like Graham's setup), or nothing happening at all (no brakes), the track is basically shorted and thus a load (resistance) is applied to the motor of the car that turns it into a dynamo or generator. This is known as EMF, or electromotive force. This in turn slows down the car. Highter torque motors brake better as they make better dynamos.

If you add a potentiometer to the brake line, you can alter the amount of load (or resistance) applied and thereby control the amount of braking.
A potentiometer has 2 connections. Remember it's a variable resistor - between two points.

Those things with 3 connections allow you to select the polarity of the resistance - 0 to full on way and full to 0 the other. Does that sound clear or is it more
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Not me, but there are quite a few racers here that use such devices.

Anybody got any plans to build a "black box"?
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