Can You Repair a Burned-Out Electric Motor?

Can You Repair a Burned-Out Electric Motor
••• MarekJA/iStock/GettyImages

If an electric motor operates at too high a voltage, excess current flowing through the windings can cause them to become hot and burn out. While it is normally not practical to repair small, direct current (DC) motors that have burned out, other motors can be repaired by rewinding.

Short Circuit

When a motor burns out, a short circuit occurs in the windings and the motor ceases to turn. You can test for a short circuit by checking the resistance of the windings with an ohmmeter; a reading of 0 ohms (Ω) indicates a short.

Winding Removal

The first step in rewinding a motor is to remove the old winding. Commercially, this is done by baking the stationary part of a motor in an oven at 650 degrees Fahrenheit for several hours.

Rewinding Coils

The new windings are wound on a coil winding machine, under the supervision of a technician, who controls the tension, layering and number of turns. The newly wound coil is dipped in epoxy varnish and, once again, baked in an oven to complete the process.

Related Articles

Motor Rewinding Procedures
How to Troubleshoot Single Phase Motors
How to Troubleshoot an Electric Motor Capacitor Problem
How to Reverse the Poles on a Magnet
How to Build Your Own Paper Foil Capacitor
How to Convert 12 Volt Alternator to 120 Volts
How Does a Magneto Work?
How Does the Condenser in a Fluorescent Lamp Work?
How to Charge a 12V Battery With a DC Motor
How to Calculate Millivolts to Amps
How to Scrap the Copper Out of an Electric Motor
Can You Grease Brushes on an Electric Motor?
How to Rewire an Electrical Motor to Generate AC Current
Parts of Induction Motors
How to Make a Simple Homemade Robot
How to Test DC Motors
What Is an Inverter Duty Motor?
How to Make a Simple Magneto
How to Convert a Generator to a Alternator
How to Convert Hertz to Motor Rpm