Identifying motor studs

[glull]

Can anyone help me identify which stud is which on the Hitachi MT-320 motor?
S1/S2/A1/A2Pic below.

[IMG][/IMG]

[rib33024]

series wound electric motor - which means that the current flows through the armature wiring terminals are labelled A1 and A2, then through the field wiring labelled S1 and S2. If the terminals aren't labelled, the A terminals are usually nearest the shaft, spaced radially, and the S terminals are along the side of the motor in a straight line. The motor is placed in reverse by switching the polarity of the field.

if you clean the motor case off good around the studs on the motor, they should be stamped in the case which terminals they are, look under the black cable, right next to the white cable, it looks like it's stamped S1 in the case of the motor

[Stevegrmich]

. . . I THINK the stud id in the below pic would be considered standard in a series motor . . . if not, someone will correct me . . .

Attachment 83765

[glull]

Man RIB, You've got better eyes than me!

So with a little extra cleaning I found the markings in order top to bottom:
F2
A2
F1
A1

Can I assume the "F" studs are the same as what would have been "S" studs?

I have an 81 DS and all the wiring diagrams call for A & S studs. I'm assuming this motor is not the original.
Try to sort this all out to test the motor, as I think the PO had it wired all wrong.

[greg-g]

S = stator or stationary part of motor
F = field or stationary part of motor
A = armature moving part of motor

Two connections are on back section of motor most likely to brushes and armature
Two connections are on center section of motor most likely to S and or F

Simple ohm meter test will tell S and or F will read to each other A should not, A should read to A and not to S and or F.

[glull]

Alas, thy motor 'tis fryed.
Now I gotta see if I can find a local repair option or do the Plumb Quick swap.
Hmmm.....

[Stevegrmich]

. . . interesting . . regardless of motor condition, what I find unusual is that you say the stud markings are F1, F2, A1 and A2 . . . typically Sepex motor "F"ield studs are 1/4" . . . you motor studs all look the same size, ie, 5/16", which would be atypical of a Series motor . . .

[glull]

Yeah, I noticed that too.
Must be a Hitachi thing?