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Discussion Starter #1
How do you determine which direction a Series DC motor should run?
Thanks
Rick
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Discussion Starter #2
You first look at the way the engine is turning in the vehicle you want to
convert to a EV and that's the way you want the motor to turn.

Then you the four motor terminals in a specific way to turn in the same way
the engine turn.

Lets say the motor terminals are label A1, A2, S1, and S2. The A1 and A2 is
the brush circuit and commentator windings and the S1 and S2 is the field
windings.

The commentator windings are connected in series with the field windings for
a DC series motor.

You can test out the rotation by applying a 12 volt battery power directly
to the motor to test the rotation. Connect the +12 vdc to A1. Install a
wire jumper from A2 to S1 and connect the -12 vdc to S2.

Always connect the battery leads first to the motor and connect last to a
battery in a very quick motion or you will get a lot a arcing. I use one of
those 500 amp 12 volt red key flag battery cutoff switches that you can get
from any auto parts store.

Now if the motor is going in the wrong direction, then connect A2 to S2 and
connect the -12 vdc to s1. It should turn the other way.

Roland


----- Original Message -----
From: <[email protected]>
To: "ev list" <[email protected]>
Sent: Friday, November 02, 2007 7:44 PM
Subject: [EVDL] Question on Series DC motor


> How do you determine which direction a Series DC motor should run?
> Thanks
> Rick
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #3
However, if your motor brushes are advanced, they have to be advanced
for the direction of rotation.

If your brushes aren't advanced, you don't have to worry about it, but
if they are advanced the wrong way, you will have to move the brushes
to the other side of center.

I *think* that you can still do a 12V test with the brushes advanced
the wrong way, but I'm not sure.

-Morgan LaMoore

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Discussion Starter #4
Thanks for the help. I have tried the 12 v test and motor will run either directition. I think the brushes are advanced however and I don't know how to determine which way the motor is supposed to run. If you are looking from the comm end the brushes are not 90 degrees to the comm.
Rick Prentiss
-------------- Original message from "Morgan LaMoore" <[email protected]>: --------------


> However, if your motor brushes are advanced, they have to be advanced
> for the direction of rotation.
>
> If your brushes aren't advanced, you don't have to worry about it, but
> if they are advanced the wrong way, you will have to move the brushes
> to the other side of center.
>
> I *think* that you can still do a 12V test with the brushes advanced
> the wrong way, but I'm not sure.
>
> -Morgan LaMoore
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
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Discussion Starter #5
[email protected] wrote:
> How do you determine which direction a Series DC motor should run?

Try running it in each direction. The one that it runs the fastest and
draws the least current is the correct direction for its present brush
timing.

--
Ring the bells that still can ring
Forget the perfect offering
There is a crack in everything
That's how the light gets in -- Leonard Cohen
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net

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