ISO Shunt-wound 110v DC motor controller
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Posts: 46,084
Looking for advise on controlling a Bodine NSH54 shunt-wound 110 v DC
motor with a Stamp. The motor is 1/8 HP and has 4 wires coming out
of it, two go to the armature, and two go to the field coils.
Curently, we use a Minarik SL52 speed controller to do the job, but this
is not easily interfaced to a Stamp. I want to automate this. I just need
to turn it on and off and control direction. The speed could be set with
a pot. Mostly looking for an "off-the-shelf' motor controller that I can
just feed TTL signals to.
Naturally, all of this stuff is obsolete and no longer in production.
I have a schematic of the Minarik SL52 controller if that would help.
If we noone can come up with anything, maybe I could just put an
automated switch between the SL52 and the motor. Anybody
know of a double pole, double throw, optically-isolated DC solid
state switch?
Bob
nienhuis@w...
motor with a Stamp. The motor is 1/8 HP and has 4 wires coming out
of it, two go to the armature, and two go to the field coils.
Curently, we use a Minarik SL52 speed controller to do the job, but this
is not easily interfaced to a Stamp. I want to automate this. I just need
to turn it on and off and control direction. The speed could be set with
a pot. Mostly looking for an "off-the-shelf' motor controller that I can
just feed TTL signals to.
Naturally, all of this stuff is obsolete and no longer in production.
I have a schematic of the Minarik SL52 controller if that would help.
If we noone can come up with anything, maybe I could just put an
automated switch between the SL52 and the motor. Anybody
know of a double pole, double throw, optically-isolated DC solid
state switch?
Bob
nienhuis@w...
Comments
You may be able to control the speed of the existing
motor controller with a digital potentiometer. You'll
need to examine the current schematics and determine
the voltage and power the existing potentiometer
endures. As far as reversing the motor, there are many
solid-state relays on the market that have a basic LED
input to activate them, yet are able to switch 25 amps
or more with a blocking voltage of greater than 250
volts (AC or DC). Look at Jameco's 162368 SSR. You
would need four of them to form an H-Bridge (=DPDT)
and would switch just the field-coil polarity. The
armature would continue to receive a single polarity
PWM signal from the controller. By switching the
field-coil, you may be able to get away with a lower
current SSR. With the above set-up, you would use the
stamp to monitor your control pot, and output an
appropropriate serial signal to the digital pot and
output two of four signals to the SSRs as to not
cross-conduct. Make sure full isolation is maintained
as this could hurt.
DD
--- nienhuis <nienhuis@w...> wrote:
>
> Looking for advise on controlling a Bodine NSH54
> shunt-wound 110 v DC
> motor with a Stamp. The motor is 1/8 HP and has 4
> wires coming out
> of it, two go to the armature, and two go to the
> field coils.
>
> Curently, we use a Minarik SL52 speed controller to
> do the job, but this
> is not easily interfaced to a Stamp. I want to
> automate this. I just need
> to turn it on and off and control direction. The
> speed could be set with
> a pot. Mostly looking for an "off-the-shelf' motor
> controller that I can
> just feed TTL signals to.
>
> Naturally, all of this stuff is obsolete and no
> longer in production.
> I have a schematic of the Minarik SL52 controller if
> that would help.
>
> If we noone can come up with anything, maybe I could
> just put an
> automated switch between the SL52 and the motor.
> Anybody
> know of a double pole, double throw,
> optically-isolated DC solid
> state switch?
>
> Bob
> nienhuis@w...
>
>
>
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