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jonlaury
Joined: 06 Nov 2006
Posts: 336
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 Posted: Fri Sep 28, 2007 11:19 am Post subject: Poor man's high torque servo circuit |
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I want to use a wiper motor as a high torque servo on a machine that feeds sheet sheet goods through itself.
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Motor output shaft is at built-in “Park” position.
Sheet edge is placed in position against limit Switch S1(NO) that closes to supply power to motor.
S1 is attached to an arm, such that it moves out of the material line of travel (and opens in the process) when the motor output shaft moves the arm.
Also attached to the arm is S2 (NC), which contacts the sheet and opens when the arm has moved to a target position. S2 interrupts power to the motor thus holding the output shaft and arm at the target position.
When the sheet has passed S2, and it closes, I want the motor to start and return to the built in “park position”.
I know this is probably child’s play for some of you. I am electronically challenged and, aside from being told to “Get a life!”, I would like the group’s advice.
Thanks,
John
[quote][b]
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nuckolls.bob(at)cox.net
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| Posted: Fri Sep 28, 2007 6:35 pm Post subject: Poor man's high torque servo circuit |
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At 12:18 PM 9/28/2007 -0800, you wrote:
| Quote: | I want to use a wiper motor as a high torque servo on a machine that feeds
sheet sheet goods through itself.
Motor output shaft is at built-in "Park" position.
Sheet edge is placed in position against limit Switch S1(NO) that
closes to supply power to motor.
S1 is attached to an arm, such that it moves out of the material line of
travel (and opens in the process) when the motor output shaft moves the arm.
Also attached to the arm is S2 (NC), which contacts the sheet and opens
when the arm has moved to a target position. S2 interrupts power to the
motor thus holding the output shaft and arm at the target position.
When the sheet has passed S2, and it closes, I want the motor to start and
return to the built in "park position".
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I take it some motivation other than your motor removed the sheet?
| Quote: | I know this is probably child's play for some of you. I am electronically
challenged and, aside from being told to "Get a life!", I would like the
group's advice.
|
I'm not sure I have a correct image of your task. Windshield
motors are unidirectional . . . I.e. the act of powering it
OFF is really a signal to continue rotation in original direction
until the park position is reached. I presume you understand this.
Do you have the motor and does it have a built-in control
card for intermittent ops timing and hi/lo speed control?
If it's an older unit with no electronics, then wiring per
my present vision is pretty simple. If it has electronics,
you'll have to do some experimenting with reference to the
target vehicle's wiring diagrams to make it sing, dance and
do dishes.
It's been a LONG time since I used one of these motors to
a task and it had no electronics. However, I dug into my
Safarri wipers to fix an intermittent that was subject of
a recall. Found a poorly soldered joint which I fixed and
the motor ran another 150,000 miles. I recall the car's
wiring diagrams being pretty cryptic . . . fortunately
the problem was visibly obvious and I didn't need to
understand it.
Bob . . .
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ceengland(at)bellsouth.ne
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| Posted: Sat Sep 29, 2007 7:07 am Post subject: Poor man's high torque servo circuit |
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Robert L. Nuckolls, III wrote:
| Quote: |
<nuckolls.bob(at)cox.net>
At 12:18 PM 9/28/2007 -0800, you wrote:
> I want to use a wiper motor as a high torque servo on a machine that
> feeds sheet sheet goods through itself.
>
> Motor output shaft is at built-in "Park" position.
>
> Sheet edge is placed in position against limit Switch S1(NO) that
> closes to supply power to motor.
>
> S1 is attached to an arm, such that it moves out of the material line
> of travel (and opens in the process) when the motor output shaft moves
> the arm.
>
> Also attached to the arm is S2 (NC), which contacts the sheet and
> opens when the arm has moved to a target position. S2 interrupts power
> to the motor thus holding the output shaft and arm at the target
> position.
>
> When the sheet has passed S2, and it closes, I want the motor to start
> and return to the built in "park position".
I take it some motivation other than your motor removed the sheet?
> I know this is probably child's play for some of you. I am
> electronically challenged and, aside from being told to "Get a life!",
> I would like the group's advice.
I'm not sure I have a correct image of your task. Windshield
motors are unidirectional . . . I.e. the act of powering it
OFF is really a signal to continue rotation in original direction
until the park position is reached. I presume you understand this.
Do you have the motor and does it have a built-in control
card for intermittent ops timing and hi/lo speed control?
If it's an older unit with no electronics, then wiring per
my present vision is pretty simple. If it has electronics,
you'll have to do some experimenting with reference to the
target vehicle's wiring diagrams to make it sing, dance and
do dishes.
It's been a LONG time since I used one of these motors to
a task and it had no electronics. However, I dug into my
Safarri wipers to fix an intermittent that was subject of
a recall. Found a poorly soldered joint which I fixed and
the motor ran another 150,000 miles. I recall the car's
wiring diagrams being pretty cryptic . . . fortunately
the problem was visibly obvious and I didn't need to
understand it.
Bob . . .
I recently read an article about a 'one-off' plane with retract gear
that had electric gear with a 1-direction motor. The gear train
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mechanism was designed to run full circle. IIRC, there were stop-points
at 0 & 180 degrees. The cam mechanism basically extended the scissors of
the gear while running from 0 to 180 degrees,then stopped. When the
motor started again, the cam continued from 180 to 0, closing the
scissors. Obviously, the cam actuator was pinned to the scissors instead
of just pushing.
If you just want 2 positions, it should be pretty easy to do. Just have
a circuit interrupter at the extended position, and over-ride the
interrupter with a momentary switch to start the return. Mechanical
design sounds like a bigger pain than doing it with a reversible motor,
though.
Charlie
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