How to Check 3 Phase Motor Winding With Multimeter

Checking the windings of a three-phase motor is an important step in maintaining its health and ensuring it operates correctly. A multimeter can be used to check for continuity in the windings and identify any shorts or faults. This article will walk you through testing your motor’s windings with a multimeter.

How to Check 3 Phase Motor Winding With Multimeter

The main advantage of using a multimeter to check three-phase motor winding is that it is relatively easy and inexpensive compared to other diagnostic tools. It requires no specialist skills or knowledge and can be carried out without expensive equipment. Small businesses with limited resources can still diagnose problems with their machines. You can find step-by-step instructions on how to check 3 phase motor winding with multimeter in this blog article.

Step-by-step Instructions for How to Check 3 Phase Motor Winding With Multimeter

Step 1: Inspect the 3-phase Motor

Before starting the winding check process, inspect the motor for any visible damages or signs of wear and tear. If you find any, consider repairing or replacing the motor. To prevent any damage to both you and your multimeter, ensure that the 3-phase motor is powered down before you start the winding check process.

Step 2: Prepare Your Multimeter

Connect your multimeter’s red and black probes to their respective terminals and ensure it is in continuity mode. This should be indicated on the display panel of your multimeter.

Once your multimeter is ready, start testing each phase winding individually. Make sure the windings of each phase are connected in a series. This can be easily done by testing the three phases while they are sequentially connected and disconnected.

Step 3: Test Each Winding with a Multimeter

Using the red and black probes, start testing each winding of the 3-phase motor. If the multimeter reads between 50 and 200 ohms, it indicates that your winding is in good condition. To ensure a proper check on all internal connections of each phase, use an ohmmeter and check the internal connections of each winding.

Step 4: Check for Any Overheating in Each Winding

Using a thermal imaging camera, look for any signs of overheating in each winding. If you find any, proceed with the necessary repairs or replacements. To get an accurate resistance measurement, test each motor winding several times. This should help eliminate any false readings or glitches.

Using a Thermal Imaging Camera

Step 5: Take Note of All Your Results

To keep track of your results, make sure you take note of all your measurements and document them accordingly. This will help make it easier to compare the results of your tests. If anything seems out of place or you need help getting accurate readings, get help from a professional electrician. They will be able to give you the necessary advice and guidance on what steps need to be taken next.

Checking 3-phase motor winding with a multimeter is an easy and accurate way to ensure your motor is in good condition. By following these steps, you’ll be able to quickly identify any issues and take the necessary steps to get them fixed.

Safety Tips for How to Check 3 Phase Motor Winding With Multimeter

  1. Ensure you wear protective gear such as safety glasses, gloves, and other appropriate clothing when performing electrical work.
  2. Ensure to turn off the power source before unplugging or plugging in any electrical device or component of a motor winding system.
  3. Inspect the wires for signs of wear/tear or corrosion. If any wires appear damaged, do not try to repair them yourself; seek professional help instead.
  4. Use the right type of multimeter for measuring 3-phase motor windings. Digital multimeters are preferred as they offer more accuracy and convenience than analog ones.
  5. Only attempt to measure voltage or current if you are familiar with the specific motor winding system.
  6. Disconnect the power source before connecting or disconnecting to the tested device.

Once you have followed these safety tips, you can check 3-phase motor windings with a multimeter. Start by connecting the probes of your multimeter to each end of the 3 phase windings – you must connect them in the same order as the wiring diagram for your motor.

Maintenance Steps After Checking 3-Phase Motor Winding With Multimeter

Once you have checked the 3-phase motor winding with a multimeter, it is important to take certain steps to ensure the safety and longevity of your motor.

  • First, replace any damaged or burnt insulation and wires identified during testing. Ensure all connections are properly tightened and insulated before rerunning the motor.
  • Test the motor once more to make sure that it is running correctly. If any issues are found, consult a professional electrician or mechanic before attempting to repair it yourself.
  • Lastly, perform regular maintenance on the motor to avoid future problems and save money in the long run. This includes lubricating all parts and checking for signs of wear and tear.

By following these simple steps, you can keep your 3 phase motor running at its peak performance for years.

What Are the Common Signs Indicate That a 3-Phase Motor Needs Servicing or Repair?

It’s important to know the signs that suggest when a 3 3-phase motor may need servicing or repair, as this can help prevent costly breakdowns and extend your motor’s lifespan. Common signs include:

  • Excessive noise coming from the motor
  • Overheating of the motor winding or frame
  • Poor performance, which could be an indication of winding failure
  • Unusual vibration from the motor
  • A burning or acrid smell coming from the motor

If any of these signs are present, then it’s important to take action and check the 3 Phase Motor Winding with a Multimeter.

Causes of Damage to a 3-Phase Motor Winding

Understanding the potential causes of damage to a 3 Phase Motor Winding is important. Here are some of the most common culprits:

  • Overheating: This can be caused by a lack of lubrication, incorrect voltage and current settings, off-balance loads, or poor ventilation. Overheating damages the winding insulation and leads to short circuits in the windings.
  • Mechanical Damage: This can be caused by incorrect installation, poor maintenance practices, or external elements like dirt and debris. Mechanical damage can lead to winding breakdowns, short circuits, and open circuits.
  • Incorrect Selection of Components: Using incorrect resistors or capacitors in the circuit can cause overheating and insulation breakdowns in the motor winding.

To prevent damage to a three 3-phase motor Winding, it is important to use the correct components and maintain them properly. Regular maintenance checks should also be carried out to identify potential issues before they become major problems.

How Can You Protect Your 3-Phase Motor From Potential Damage?

The best way to protect your 3-phase motor from potential damage is to ensure all components are regularly checked and maintained. Here are some tips for protecting your motor against potential damage:

  • Check the temperature of the motor during operation. If it gets too hot, switch off the power and determine the cause of the overheating before restarting.
  • Make sure the motor is properly lubricated, and any seals are intact.
  • Ensure the voltage and current settings are correct for the motor.
  • Regularly check the balance of the motor’s load to ensure it is manageable.
  • Keep your motor clean and free from dirt and debris.

Following these simple steps can help ensure your 3-Phase Motor runs as efficiently and safely as possible.

Is There Any Risk of Electric Shock While Checking for Continuity in a 3-Phase Motor Winding?

The risk of electric shock while checking for continuity in a 3-phase motor winding is low as long as the appropriate safety precautions are taken. When using a multimeter, it is important to use insulated tools and to ensure that any exposed wires or connections are properly grounded. 

It is Important to Use Insulated Tools

The multimeter should never be used on an energized circuit, and it is always advisable to wear safety glasses and protective clothing when working with electrical systems. When checking for continuity in a 3-phase motor winding, the multimeter should be set to the resistance setting, allowing you to measure each wire’s resistance in the circuit.


In conclusion, checking three-phase motor winding with a multimeter is not complicated and can be completed in just a few steps. The process uses the multimeter’s ohmmeter function to measure each phase’s resistance and then compares them to determine if they are balanced or unbalanced. 

It is important to remember that there are safety considerations when taking measurements and understanding how reading the results can help diagnose problems with a motor. This article has been beneficial for learning how to check 3 phase motor winding with multimeter. Make Sure the preventive measures are followed chronologically.

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Enrique Howard

Hi, I am Enrique. I started my professional life as a handyman and did a lot of external and internal repair of home and office with a little bit of electric and plumbing support. I have extensive experience in tools testing such as drilling, turning, milling, and non-conventional machining like EDM. So let me help you on your journey towards becoming an enlightened DIYer with amazing tools that you can use on your project.

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