If the current is exactly 1A then the resistance equals the voltage. To get sufficient resolution you need to feed about 1 Amp into a motor winding, while measuring the voltage across it. This included detecting developing coil-to-coil, turn-to-turn, and phase-to-phase short circuits before they become catastrophic. You can measure your motors DC resistance with a multimeter, but not directly, because the value will be very low (0.05 Ohms).
#How to measure motor winding resistance portable#
For these types of tests, other types of instruments must be used, such as the portable, light weight, hand-held, de-energized motor testers offered by ALL-TEST Pro.ĪLL-TEST Pro provides hand-held, battery operated, field portable test instruments designed to evaluate the entire electrical health of the motor. Reliable resistance measurement of coil winding under energizing AC voltage. However, motor winding faults can also occur within the winding and is not detectable using the Meg or Micro-Ohmmeters. DAC-HRT-1 is designed for accurate temperature rise testing of motors. This value will normally be in the range of tens to millions of ohms. The motor was running freely with no other apparent problems. He did manage to record some current readings of : 5.1 / 5.6 / 6.1 Amps.
I know the resistance readings should be closer together. It had winding readings as follow : 4.02 / 2.62 / 3.18 ohms. When testing electric motors, it is useful to know the insulation resistance between motor winding(s) and the frame ground. The motor in question is one that a work collage had to investigate. The unit of measure for resistance is an ohm. A Meg-Ohmmeter is used to measure high resistance circuits. These electrical tests will find issues within the windings of a motor using resistance. A Micro-ohmmeter is used to measure low resistance circuits. An Ohmmeter is used to measure the electrical resistance between two points.
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