Motor Winding Hotspot – Thermal Scan Report
Filler 1 - internal scan of motor casing/fins
Electric Motor (Stator Housing)
TRX-1001
John Smith
May 10, 2024 at 9:30:00 AM
2.00
1.00
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3.00
1.94
Breaker shows elevated temp of 29.5°C with reversed circuit behavior. Fire hazard possible if left unaddressed.
Upper left winding area. Centered on left-mid side of motor, beneath surface fins. Horizontal banding implies internal component issue vs. surface obstruction.
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.
Breaker shows elevated temp of 29.5°C with reversed circuit behavior. Fire hazard possible if left unaddressed.
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
• 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
• Uneven load distribution across windings
• Partial short or insulation breakdown
• Age-related degradation
• Dirt or oil buildup affecting heat dissipation
• Add to Preventive Maintenance inspection list
• Schedule load balance and insulation test
• Monitor thermal signature monthly
• Train operators to report unusual sounds/heat smells
1. Perform a Breakdown Analysis
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Title | Component | Inspection Date | Signs and Symptoms | Thermal Visual Cue | Likely Issue | Thermal Image Upload |
|---|---|---|---|---|---|---|
Motor Winding Hotspot – Thermal Scan Report | Electric Motor (Stator Housing) | 10/05/2024 | • 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. | 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. |
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