Re: 4Q Motor control paradox


Roger wrote:
Genome wrote:


Space does not go Bang!

Well, perhaps just once in it's lifetime, usually at birth ;-)

BTW, not bored....just been looking at an old chopper cct that I used
in the past and am thinking of using again and I wondered why I need
the braking resistors.


The answer is simply to "recapture" the ebergy used during braking
and return it to the storage medium (battery) The purpose, of course,
is to extend the range of the vehicle.
The EM device switches from motor to generator during the
braking process and an H bridge configuration allows for
full 4 quadrant operation. The wheel that is braking continues
rotating in the same direction, so by switching the current flow
through a different configuration in the H bridge, the energy can be
returned to the battery as opposed to being drawn out.

Dave

.

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