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Not
authoritative, but a start.........
https://www.quora.com/How-can-the-direction-or-rotation-of-a-DC-compound-motor-be-reversed
RJ
Wishing his Dad was
still alive to answer that question.
On 9/5/2019 1:35 PM, Darryl McMahon
wrote:
I
have been using a spare ET snowthrower motor over the summer to
power some test rig contraptions over the summer, and it's worked
like a charm.
Last week, I was asked to try powering something new (possible
amphibious drive 'tire'), but the new wrinkle is they want to be
able to move forward and reverse.
As I understand it, the snowthrower motors are compound wound -
strongly series but with a weak shunt field to prevent motor speed
runaway. On the blowers and tillers, there are jumpers between
what I expect are the 2 sets of field windings. (I don't have a
schematic for these motors.) Which posts do what on these motors
(there are six external connection posts). For ET use, only two
connections are used (pack positive and pack negative).
On a series motor, this can be done by reversing the field or
armature connections (but not both).
I'm looking for guidance on the possibility of reversing one of
these motors. If that's doable and not going to damage the motor,
I expect I would be putting a set of contactors in place to be
able to do this conveniently and repeatedly. I need the motor to
survive so it can go back on a snowthrower in a couple of months.
Thanks in advance for any documentation or guidance,
Darryl
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