Replacement Armatures
This is a replacement exciter armature for Lincoln SA-200 Pipeliner, SA-250, SAE-300, and SAE-400 engine-driven welders.
Lincoln Exciter Armature
Lincoln DC Armature Locator
Weldmart-Online Rewound DC Exciter Armature
SA-250/Classic 1, 2, &3 AC exciter rotor
SAE-300 and 400 AC exciter rotor
Exciter armatures tend to fail at a high rate. We stock rebuilt exciter armatures and AC field frames. Send us your core; if it is rebuildable, we will credit your account. Please contact us with armature questions.
Lincoln Main Armature
The graphic below is an SA-200 main armature. Although you cannot tell from the picture, this armature is defective. This armature has a short between the one of the windings and the metal core.
Weldmart-Online Rewound Main Armature for SA-200, SA-250, SAE-300, and SAE-400 Engine-Driven Welding Machines
TIP: Starting your welding machine by jumping it with another machine will destroy your main armature
Situation A: If your armature is old, but still "good" , this is what we can do for you. Be aware that your machine can weld just fine, but still have defective windings. Send your armature to us and let us test it. If it has no shorts, we can recondition it. When we say "recondition," the following is our standard procedure:
- Chemically clean the entire unit (remove any oil, grease, dirt, and dirt-dobber nests).
- Check and repair any broken connections.
- Remove the steel bands. Steel bands are easy to install when manufacturing an armature. The problem is that, over time, the bands rust and break. At 1500 rpm's, a broken band makes a lot of racket and tears up your stator; fiberglass bands will never rust and break.
- Dip and bake the armature.
- Machine the commutator (makes it level so the brushes run smooth and true).
- Undercut the commutator slots to make sure they are all the same depth.
- All repaired and rewound armatures are dynamically load tested (250 amps for a minimum of one hour!).
Situation B: If your armature is dead, shorted, burnt, or whatever, here is what we can do:
- Chemically clean the entire unit (remove any oil, grease, dirt, and dirt-dobber nests).
- Strip steel bands and windings off the armature. The armature is stripped down to bare metal and checked for any defects, mechanical or electrical. At this point, the core is inspected and we determine if the core is rebuildable.
- Check the commutator to make sure it is good and that there is no insulation breakdown.
- Install all new copper bars with Dupont® Nomex® insulation (we do not use paper insulation). The armature is then dipped in "Class H" insulation and baked.
- Machine the commutator and rework the commutator slots to make sure they are all the same depth.
- All repaired and rewound armatures are dynamically load tested (250 amps for a minimum of one hour).
