Motor Winding Hotspot – Thermal Scan Report

Electric Motor (Stator Housing)

Winding imbalance or localized current concentration. May also indicate a.) Overloaded phase in motor windings, b.) Shorted coil turns, c.) Rotor bar issues (depending on motor type), d.) Poor ventilation or insulation degradation.

• Unusual humming noise • Slight oil discoloration • Elevated ambient temperature readings

Horizontally distributed hotspots, mid-core with temperature reaching 50.5°C, hot region average 38.8°C, and cool region average ~21.4°C. Even spacing of thermal bands suggest internal heat development in coils or windings. Thermal bloom indicates localized heat retention not dissipating evenly.

• Perform insulation resistance test (Megger test) • Use clamp meter to measure load current on each phase • Check motor nameplate vs. actual load • Ensure ventilation fins and airflow paths are unobstructed • Inspect motor for dust/oil buildup that could trap heat

• Schedule winding integrity test (surge or hi-pot) • Monitor motor during operation under normal load • Check fan operation and cooling effectiveness • Clean external casing and confirm no blocked vents • Tag for trending: if temperature rises or hotspot spreads, escalate