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How to Determine the Condition of a Motor Using a Multimeter?

1 Answers

DiLayla

07/30/25 9:32am

Using a multimeter to test the condition of a motor involves the following steps: With the power disconnected, place the black and red probes of the multimeter on the motor's terminals to measure. For a three-phase motor, measure between each pair of terminals and observe the resistance value on the multimeter. If the digital multimeter displays a value, or the analog multimeter shows resistance, it indicates that the motor windings are conducting properly. If no resistance is detected, the motor is likely damaged. Additional Information: The cause of motor overload may be low terminal voltage. This refers to the voltage measured at the motor's stator terminals during startup or full-load operation, not the no-load voltage. When the motor load is constant, a decrease in voltage will inevitably lead to an increase in current, causing the motor to overheat. Severe voltage drops can force the motor to stop or operate at low speeds, with a sharp increase in current potentially leading to motor burnout.

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