Re: Motor cycling between limits
- From: "Fred Bartoli" <fred._canxxxel_this_bartoli@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 20 Aug 2005 16:05:15 +0200
"Terry Pinnell" <terrypinDELETE@xxxxxxxxxxxxxxxxxxx> a écrit dans le message
de news:ahicg1trk3c64dl4vi8gf7lddab595f64m@xxxxxxxxxx
> I'm making heavy weather of what should be a fairly simple design.
> Taking the simplest case first. I want to run a mechanism with a DC
> motor (say 12V, up to 15A stall current) between fixed limits,
> constantly cycling: forward, reverse, forward, etc. Typically 500 ms
> in each direction. I'd welcome alternatives, but one way is to use NO
> microswitches at the limits to set and reset a bistable, whose output
> drives a DPDT relay, hence controlling the direction of current
> through the motor.
>
> But now the harder case. What's the simplest way to add separate short
> pauses, say 100 ms at the forward limit and 300 ms at the reverse
> limit?
>
Some high tech solution:
add some play between the motor/actuator and its load so that once the motor
has just reversed the load starts moving 200ms later. Then adjust your
microswitches positions one to +50ms, the other to -50ms.
You could adjust the motor speed so that the 200ms corresponds to 555 (um).
--
Thanks,
Fred.
.
- References:
- Motor cycling between limits
- From: Terry Pinnell
- Motor cycling between limits
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