How to identify electric motors
Motors convert electrical energy into rotating mechanical power.
Have one in front of you? Photograph it and get an evidence-backed identification.
Identify from a photoIdentification clues
- —Rating plate: kW/HP, voltage, current, speed, frequency, IP, insulation class
- —Frame size and mounting (foot, flange B5/B14)
- —Shaft diameter and keyway
- —Terminal box position
- —Cooling arrangement
Common types
- —Three-phase induction
- —Single-phase
- —Brushed DC
- —Brushless DC
- —Servo
- —Stepper
- —Gear motor
Typical failure modes
- —Winding insulation breakdown
- —Bearing failure
- —Overheating
- —Rotor bar damage
- —Shaft or keyway wear
What a replacement must match
- —Match power, voltage, speed and frequency
- —Match frame and mounting
- —Match shaft dimensions
- —Check efficiency class and duty
Photos that help identification
- —Photograph the rating plate straight-on
- —Show the shaft end and flange
- —Show the terminal box
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Related guides
General reference information. Always verify against the manufacturer’s documentation before ordering or installing.