How to Check Motor Winding with Multimeter

How to Check Motor Winding with Multimeter. Too many individuals neglect to examine and repair the fan on their electric motor. The fan is critical to the functioning of your motor because it keeps it cool so it can run for extended periods of time. As you might expect, dust and debris may quickly block the fan, reducing circulation and trapping heat within.

How to Check Motor Winding with Multimeter

Although the exterior of the fan may appear to be clean, dust and dirt may have accumulated elsewhere, slowing the fan. When you unscrew the fan cover to clean it, check the fan to make sure it spins freely.

Furthermore, you must secure the fan to the motor; alternatively, the fan will not move correctly, and the motor will overheat and finally fail.

Diagnose the problem

The driving load has become stuck, bound, or misaligned. A burned wire or connection, a winding breakdown with insulation corrosion, or a failing bearing are all possibilities if the motor itself has acquired a defect. Set the multimeter to the ohms function if the shaft spins freely.

All three windings should measure low but not zero ohms in a three-phase motor. This measurement will be greater if the motor is smaller and shouldn’t be open.

Prerequisite tasks

The windings of an electric motor are, unsurprisingly, critical to its mechanics. You should regularly examine the windings’ overall excessive wear, but more significantly, you should assess their resistance.

Check motor winding with a multimeter

  • To test the windings, you’ll need a multimeter first and foremost.
  • Connect the multimeter to ohms and test your motor’s wires and terminals first. You should check the windings for a “short to ground” in the circuit, as well as any open or shorts.
  • To check for a short-to-earth in your motor, set your multimeter to ohms and unplug the motor from the power supply.
  • Then glance over each wire for endless readings. If you obtain a reading of 0, you may be dealing with a cable issue.
  • To determine whether a cable is faulty, test each one separately and make sure hardly any of the leads are contacting.
  • You’ll be able to locate the cable causing the issue if you test each one separately.
  • If every cable, on either hand, gives an endless reading, you have a motor problem and should engage an expert repair service.
  • You should test the different indications to see if there are any open or shorts in the windings. The marks on various motors will be different.
  • you may find the setup of your motor in the user handbook. You’re aiming for a measurement of.3 to 2 ohms in general. Whether you receive a reading of 0, you should repeat the test to see if you get the same result.
  • A value of 0 indicates that there is a phase deficiency. A shortfall occurs when wires are shorted to the ground, resulting in a break in the wire.
  • If your reading is significantly higher than 2, you certainly have quite an open winding. An open winding merely means a wire has snapped.


The windings should have MΩ measurements to ground, i.e., the motor enclosure, for appropriate motor running. Until there is a risk of a loose or chafing wire inside, a winding is grounded out, the winding insulation is decomposed, or the armature is contacting the stator.

For phase to phase terminal, use a multimeter or ohmmeter to check the motor winding resistance or ohms reading. Each winding’s ohms reading must be the same.

Leave a Comment