Thread: Motors generating power
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Unread 24-06-2002, 00:38
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#0047 (ChiefDelphi)
  
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Not Diodes
Posted by Al Skierkiewicz at 2/13/2001 2:04 PM EST


Engineer on team #111, Wildstang, from Wheeling High & Rolling Meadows High and Motorola.


In Reply to: Red vs Blue
Posted by Shawn McMahon on 2/12/2001 5:15 PM EST:



The two leaded devices are not diodes. See Ed's entry. The transorbs are intended to squash spike voltages generated by the motors from damaging the microcontoller in the speed controller. A rapid change in direction(standard for competition) on the motor is capable of producing a rather short but high voltage pulse that exceeds 12 volts.
Theoretically if the motors were turned at the same speed as your top speed they should produce about 12 volts. Since there is no power supplied to the speed controllers with the power turned off, the FETs that switch current to the motors, look like resistors. Drive the motor by pushing and voltage is generated, current flows through the FETs and appears at the input terminals of the controllers.
Al



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