Now nosotros demand to access the motor leads in addition to then nosotros tin supplant them. To larn to the motor leads, nosotros demand to detach the motor’s core, or champaign core, from the motor housing. As you’ll see, nosotros cannot detach it completely; although nosotros volition physically carve upwards it from the housing, it volition stay attached via 2 wires. (In the photograph upwards above, the 2 wires inward inquiry await similar H2O mocassins.) We must endure careful non to disturb those 2 wires.
The outset affair you’ll demand to create is take these 2 screws.
The screw on the overstep side of the motor--which appears on the correct here, since the motor is on its side--has a metallic plate attached to it alongside the motor’s specifics written on it. This is similar a laundry-care tag for electrical motors. In whatsoever case, it comes off alongside the screw.
Put the screws in addition to the metallic plate somewhere safe. Now, looking downwards on the motor from this angle, await into the night gap betwixt the substance in addition to the housing.
In the centre you’ll encounter a niggling nub protruding from the core.
Carefully stick a flat-bladed screwdriver--a regular 1 volition do, it needn’t endure hollow-ground--into the gap in addition to then that the apartment business office of the blade is fully contacting the nub. (Don’t house the screwdriver anywhere else inward this gap, every bit you lot don’t desire to harm the enamel-wrapped windings.)
What you lot demand to create adjacent is super-easy, but I constitute it was easier to demo it inward video rather than photos, in addition to then you lot tin encounter the motions I’m using in addition to larn a feel of how gently you lot must opened upwards this part:
If for merely about argue what I merely showed you lot inward the video doesn’t work, flip the motor over, repeat the screwdriver play tricks on the other side, in addition to you lot should endure all set.
From hither on in, recall that nosotros must handgrip these 2 parts (the substance in addition to housing) alongside attention in addition to then every bit non to disturb the 2 wires that stay connected. Those are the brush leads, they connect the substance in addition to the brush tubes, in addition to I accept never had to supplant them on a potted motor yet. These are non the wires we’re concerned alongside inward this tutorial, in addition to then unless you lot encounter bad insulation on them, exit them be.
Now I’m going to demo you lot the Worst-Case in addition to Best-Case Scenarios for what you lot powerfulness encounter when you lot cleft the motor opened upwards every bit nosotros merely have. Sadly, a minor per centum of you lot may accept the Worst-Case Scenario, which may non endure fixable.
The Worst-Case Scenario
This is the machine that had grease in addition to peradventure crude inserted into the brush tubes past times a previous owner. Unsurprisingly the within looks similar hell.
Zooming in, nosotros encounter the wiring is totally fried, in addition to at that topographic point is night grit all over the place. This is bad.
I’ll flip the motor over in addition to then you lot tin encounter the wiring from the other side, in addition to larn a feel of merely how bad:
The insulation has melted, either every bit a upshot of a curt somewhere within the motor, or due to coming into contact alongside the grease in addition to crude it was never meant to endure. The wiring insulation looks similar melted cheese that appears to accept seeped betwixt the private strands of wire. I don’t think I tin strip this, in addition to if I can’t strip it, I can’t solder a novel connecter on. For those of you lot alongside Worst-Case Scenario motors similar this, I’ll give-up the ghost along searching for a solution.
Stuck Brushes
Before nosotros larn to the Best-Case Scenario motors I’m hoping nearly of you lot have, nosotros demand to bargain alongside the brush tubes.
On merely about of your motors the brushes may non accept been removable from the outside. So we’ll bargain alongside them now.
Looking within the Worst-Case Scenario machine, it’s slow to encounter why the brushes were stuck: The ends of them accept melted out of cast due to the grease or crude that got into the motor.
To take these brushes, nosotros force from the outside.
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| Stick a Q-tip into the brush tube… |
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| …and the brush pops out inside. |
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| Now create the same to the other side. |
Finally, take both brushes in addition to laid them aside. Even if they're covered inward crude in addition to grease similar this, we'll nonetheless endure able to relieve the springs, which volition come upwards inward handy every bit merely about places sell motor brushes without springs.
The Brush Tubes
Whether you lot accept a Best- or Worst-Case motor, build clean your brush tubes out alongside dry, build clean Q-Tips.
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| Yep, same photograph from above, but this fourth dimension we're swabbing. |
You tin visually inspect the brush tubes alongside a flashlight to encounter if they’re clean.
If there’s a niggling graphite dust from the brushes, that’s fine; but if there’s whatsoever crude or grease inward there, it must endure removed. For that you lot tin purpose a Q-tip dipped inward rubbing alcohol. Be certain to blot the Q-tip good in addition to then you lot don’t post alcohol sloshing downwards the subway scheme in addition to onto the brush atomic number 82 wires.
The Best-Case Scenario
Here we’ve cracked opened upwards a motor where the wiring clearly needs replacing; the insulation is dry, cracked in addition to rotting.
But it’s nonetheless a Best-Case Motor, because the telephone commutation discussion is “dry.” This motor was properly maintained in addition to at that topographic point is no grease or crude within in addition to on the wiring.
So if your motor looks similar that, breathe a sigh of relief, because our labor hither volition endure relatively straightforward.
Go on to Part 13: Cutting the Motor Leads
