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Re: H-bridge & Motor

On Wed, Jan 19, 2000 at 02:10:53PM -0500, Joyce Poon wrote:
> Bad News:
> The motor (esp the big one) draws so much current that all the transistors
> get VERY HOT.  The motors do not turn very fast either.  The little one is

More Bad News:  We're crossing emails.  :)

Or should I say we're "playing email tag"?  ;-)

The fact that the transistors get hot is not a problem.  The
transistors get hot when they are under constant use, but in the real
robot, they would only be under pulsed short-term use.  Without
testing real-world conditions, we can't say yet whether heat
production is a problem or not.

That fact that the motors to do turn very fast or with much torque,
is a problem.

> If we really have to stick with the big motors, another circuit (possibly
> the mixed relay-transistor circuit) to control the motors may be required.

This is Malone's reccomendation.  See earlier email.

> H-bridge good.
> Motor bad.
> Big motor makes Joyce >(

No Joyce, that's not true, and I think you should be a little more
mature.  A longer diatribe has been deleted.  If you want to discuss
this again, I'll happily discuss it with you again in person but not
in email.

Signature withheld by request of author.