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Unread 01-06-2012, 08:22 AM   #1
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Default Motor terminals a1 a2 s1 s2 on a series 48v ds

Hi

I'm trying to diagnose an intermittent no go condition on my 2001 ds. Can anyone explain the terminals on the motor and how they work in conjunction with the f/r switch (lever type)?
A1: B+
A2
S1 ?
S2 ?

I figure these terminals have a specific purpose for reversing polarity, but it would be great if anyone could share more info on their function.

Thanks
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Unread 01-06-2012, 10:00 AM   #2
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Default Re: Motor terminals a1 a2 s1 s2 on a series 48v ds

Google is your friend on this subject.
http://www.animations.physics.unsw.e....html#DCmotors

The motor can be trouble shot by testing for unwanted continuity (short) between the armature (A1 & A2) and the field (S1 & S2).
Use a simple continuity test with your DVM. you should have continuity between A1 & A2 and again between S1 & S2 but not between any A and any S terminal.
If the motor continuity test are good move on to testing other components.
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Unread 01-07-2012, 12:04 PM   #3
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Default Re: Motor terminals a1 a2 s1 s2 on a series 48v ds

Quote:
Originally Posted by scottyb View Post
Google is your friend on this subject.
http://www.animations.physics.unsw.e....html#DCmotors
wow! im pretty sure the OP wasn't looking for a dissertation on motor theory...


anywho, the switch reverses the flow of current to either the armature or the field. the block diagrams below show the reversal of current flow through the field.
-sj
Attached Images
File Type: jpg series-motor-diagram_F.jpg (47.4 KB, 15 views)
File Type: jpg series-motor-diagram_R.jpg (48.8 KB, 11 views)
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Unread 01-07-2012, 01:10 PM   #4
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Default Re: Motor terminals a1 a2 s1 s2 on a series 48v ds

Quote:
Originally Posted by sonicj View Post
wow! im pretty sure the OP wasn't looking for a dissertation on motor theory...
How would YOU know? It seems the only reason YOU are here is to badger the help. Step off, or step out.
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Unread 01-07-2012, 01:43 PM   #5
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Default Re: Motor terminals a1 a2 s1 s2 on a series 48v ds

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Originally Posted by sonicj View Post
wow! im pretty sure the OP wasn't looking for a dissertation on motor theory...

friggin douchebag
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Unread 01-07-2012, 02:29 PM   #6
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Default Re: Motor terminals a1 a2 s1 s2 on a series 48v ds

Thanks guys. Thanks sonicj that's exactly what I was looking for.
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Unread 02-14-2012, 10:26 PM   #7
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Default Re: Motor terminals a1 a2 s1 s2 on a series 48v ds

Some other motor terminals called F1 & F2 besides A1 and A2. What's the different between S and F terminals?
TIA
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Unread 02-15-2012, 07:13 AM   #8
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Default Re: Motor terminals a1 a2 s1 s2 on a series 48v ds

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Originally Posted by Petrie Ramlie View Post
Some other motor terminals called F1 & F2 besides A1 and A2. What's the different between S and F terminals?
TIA
Typically, Shunt wound motors have terminals a1, a2, f1, f2 and Series wound motors have a1, a2, s1 and s2 . . . if that is bad info, someone will clear it up . . .
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Unread 05-26-2013, 08:34 AM   #9
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Default Re: Motor terminals a1 a2 s1 s2 on a series 48v ds

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Originally Posted by Stevegrmich View Post
Typically, Shunt wound motors have terminals a1, a2, f1, f2 and Series wound motors have a1, a2, s1 and s2 . . . if that is bad info, someone will clear it up . . .
My motor has the A1, A2, S1 and S2 setup. I assume 2 are forward and 2 are reverse? But which is which?
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Unread 05-26-2013, 08:59 AM   #10
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Default Re: Motor terminals a1 a2 s1 s2 on a series 48v ds

Wrong assumption. Current has to flow through both the armature (A) and field (S or F) to generate torque. Reversing the flow in one or the other will reverse the direction of rotation.
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