Getting copper out of an electric motor involves cutting or pulling the copper windings free from the steel core they’re wound around. The process is straightforward with basic tools, though it takes some effort since motors are built to hold those windings tightly in place. Whether you’re scrapping a single motor from a broken appliance or processing a pile of them, the approach depends on your tools and how much time you want to invest per motor.
Where the Copper Lives Inside a Motor
The copper in an electric motor sits in tightly wound coils called windings, and these are packed into deep slots cut around the inside of the stator, which is the outer cylindrical body of the motor. The stator itself is made of thin steel sheets (laminations) stacked together, and the copper coils thread through grooves in that steel. This layered construction is what makes extraction a physical challenge: the copper is essentially woven into the steel frame.
Smaller motors found in appliances and power tools also have copper in the rotor, the spinning inner part. In many DC motors, both the rotor and stator contain windings. The amount of copper you’ll recover varies by motor type. AC motors average 7 to 9 percent copper by weight, while DC motors contain 15 to 18 percent. Fractional horsepower motors, the kind found in household items, average around 9 to 10 percent. So a 20-pound AC motor might yield roughly 1.5 to 2 pounds of copper.
Tools You’ll Need
For manual extraction, the core toolkit includes:
- Angle grinder: the most versatile tool for cutting through the steel housing and slicing copper coil ends
- Reciprocating saw (Sawzall): useful for cutting through windings on one side of the stator
- Hacksaw: a slower but quieter alternative for smaller motors
- Hammer and chisel: for knocking windings loose once they’ve been cut
- Bolt cutters, snips, or cable cutters: for trimming and separating copper from insulation and steel
- Carpenter’s pincers: helpful for gripping and pulling individual winding loops
An air chisel or power chisel speeds things up considerably if you’re processing more than a couple of motors. For high-volume work, dedicated hydraulic machines exist, including stator cutting machines, winding pullers, and motor crackers that can strip a motor in seconds.
Step-by-Step Manual Extraction
Start by removing the motor from whatever equipment it’s attached to and stripping off any external housing, brackets, fan covers, or junction boxes. Pull the rotor out of the stator by removing the end caps (usually held on by long bolts). Set the rotor aside if it contains windings of its own.
With the stator exposed, you’ll see copper coil ends looping out from both sides of the steel core. The goal is to cut through the windings on one side, then pull or hammer them out from the other. Use an angle grinder or reciprocating saw to cut across all the coil ends on one side of the stator, slicing them as flush to the steel as you can. This severs the loops so the remaining straight sections of wire can slide free.
Flip the stator over. Now use a hammer and chisel to drive the cut winding segments out through the slots. They should push through since you’ve already severed the loops holding them in place. On stubborn motors, heating the stator slightly with a torch can soften the varnish insulation that bonds the windings to the steel, making them easier to knock free. Work your way around the entire circumference until all the slots are empty.
For the rotor, the process is similar but smaller scale. Cut the winding ends on one side and tap them out, or use pincers to grip and pull individual coils free.
Processing Larger Quantities
If you’re scrapping motors regularly, manual extraction gets tedious fast. Hydraulic motor wrecking machines are designed specifically for this work. Stator cutting and pulling machines slice one end of the windings and then use hydraulic force to yank the copper out in one motion. Dedicated winding pullers grip the coil ends and extract them without cutting first, which can be faster on certain motor sizes.
These machines handle everything from small fractional horsepower motors to large industrial units. The investment only makes sense if you’re processing enough volume to justify it, but they cut extraction time from several minutes per motor down to seconds.
What Your Copper Is Worth
Copper pulled from motor windings is coated in enamel insulation and often has bits of varnish or lacquer still attached. This puts it in the #2 copper category at scrap yards, which pays less than clean, bright copper wire. The price difference between #2 copper and bare bright copper can be significant, sometimes 20 to 30 percent less per pound.
You can improve your grade by stripping the enamel coating off, but on the thin gauge wire found in most motors, this is rarely worth the time. Some scrappers burn the insulation off, but this is illegal in most jurisdictions. EPA regulations and state-level rules prohibit open burning for metal salvage, and the fumes from burning wire insulation contain toxic compounds. Beyond the legal risk, scrap yards will often refuse or pay less for burned copper because fire damages the metal’s surface quality.
Your best bet for maximizing value is to separate the copper cleanly from the steel, keep it free of other contaminants, and sell it as #2 copper. Some yards buy whole motors at a flat rate per pound, which saves you the labor of extraction. Compare the whole-motor price against the #2 copper price times your expected yield to decide whether breaking them down is worth your time.
Safety Considerations
Cutting into motors creates sharp steel edges and hot metal fragments. Heavy gloves, safety glasses, and long sleeves are essential. An angle grinder throwing sparks near oily motor housings is a fire hazard, so keep a clear workspace and have an extinguisher nearby.
Some motors, particularly those in HVAC systems and industrial equipment, have capacitors attached or built in. Capacitors store electrical energy even after the motor has been unplugged and fully powered down. They can deliver a dangerous shock or even explode if punctured or short-circuited. Before dismantling any motor, check for capacitors (usually cylindrical components mounted on or near the motor housing) and discharge them safely by shorting the terminals with an insulated screwdriver.
Older motors may contain oil-filled components, and the liquid dielectric in some capacitors can be toxic. If you encounter any oily residue you can’t identify, handle it with gloves and dispose of it properly rather than dumping it. Industrial motors built before the late 1970s occasionally contain PCB-contaminated oils, which require special handling.