Subject:
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Re: Handyboard low voltage motor control
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 20 Oct 1999 19:17:48 GMT
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Viewed:
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1050 times
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Well, I went with separate h-bridge to maintain PWM and it turns out that
even though the motors are geared down, they still don't have enough torque
to haul around all the batteries. Looks like I'll stick with 9v motors...
Thanks for the suggestions,
Paul
Gary Livick wrote in message <380B772F.FADA385C@pacbell.net>...
> Good point...
>
> There is another way. You can build your own h-bridges using mechanical
> relays and maybe a few diodes. They drop zero volts, which is good. • However,
> you obviously can't PWM the things. If you just want rudimentary speed
> control, you could add another SPDT relay in line to add a dropping • resistor
> in series..... You can use the motor outputs right off the Handy Board to
> switch your bridges.
>
> If you want PWM, you can build your h-bridges from solid state dc-dc • relays.
> They switch in about a half microsecond, so are plenty fast. Some even • have
> flyback diodes built in, and only turn on when forward biased, which is • great
> for use in h-bridges. However, these will drop some voltage, so you have • to
> account for it when sizing your motor voltage supply. To control these, • you
> also use the outputs directly off your Handy Board. I've used the latter
> method myself, and it works great.
>
> Gary Livick
>
>
>
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Message is in Reply To:
 | | Re: Handyboard low voltage motor control
|
| Good point... There is another way. You can build your own h-bridges using mechanical relays and maybe a few diodes. They drop zero volts, which is good. However, you obviously can't PWM the things. If you just want rudimentary speed control, you (...) (25 years ago, 18-Oct-99, to lugnet.robotics.handyboard)
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