How To Test A Small Dc Electric Motor

These days direct current or dc electric motors are used in a wide range of applications such as the moving windows and seats in your car.

How to test a small dc electric motor.

Consult the motor schematic or a diagram of the motor s windings and use the meter to measure the resistance of the windings. The type of motor will determine the types of tests you will perform to troubleshoot it. If it stays shorted or does not rise there is probably an issue with the capacitor and may need to be replaced. They generally operate on low voltage electricity 6 to 24 volts and are powered by batteries or a transformer that reduces 110 volts to the required low voltage.

Dc or direct current motors are the most efficient electrical motors on the market today. Check c to e s to e r to e. There are two major components of an electrical motor called the stator and the rotor. The meter should not show an open or a short when a winding leg is measured.

Test for direct. Small electric motors operate a wide variety of electrical devices such as remote control models children s railroad sets and computers. As with the first test the important thing to observe is that each measurement should be about the same. This will check every coil in the motor armature.

Each winding leg should have some small resistance reading. This is why once you have managed to get to your dc electric motor you. Small universal motors as for portable electric drills may contain extensive circuitry including a switch and brushes. Placing the test probes on the capacitor terminals the resistance should start low and gradually increase as the small voltage supplied by the meter s battery gradually charges the capacitor.

Again the specific value is based on the motor design wires per loop number of turns per coil and wire gauge. Minimum test value for a good electric motor is at least 1mω running amps test with the motor running check the full load amps fla with a suitable meter or preferably a clamp on meter and compare with the. Because of the concealed nature of these motors it can be highly difficult to complete any repairs or maintenance on them without having to pull whatever it is powering apart. Understanding the basic layout of a dc motor can go a long way in the troubleshooting and repair of the motor.

The second check is the bar to bar resistance test pictured on right. To check an electric motor to see. Set the voltage setting of the insulation resistance tester to 500v and check motor windings to earth. Small fan motors last a long time due to few moving parts.