How to faster determine reasons for informal work in motor trades

When a motor is running or malfunctioning, timely fault prevention and troubleshooting can be achieved through visual inspection, auditory checks, smell detection, and touch. These methods ensure the motor operates safely.

一. Visual Inspection

Observe the motor for abnormalities during operation:

1.Smoke emission may indicate a short circuit in the stator windings.

2.Slowed speed with a heavy "buzzing" sound suggests severe overloading or phase loss.

3.Excessive vibration may result from mechanical jamming, loose mounting bolts, or improper motor fixation.

4.Discoloration, burn marks, or smoke stains on internal connections or windings indicate localized overheating, poor contact, or winding burnout.

二. Auditory Checks

A normally functioning motor produces a uniform, low "buzzing" sound without unusual noises. Abnormal sounds may indicate:

1.Uneven stator-rotor air gap – A high-low fluctuating sound caused by bearing wear, leading to misalignment.

2."Squeaking" metal friction – Often due to insufficient bearing lubrication; disassemble and apply grease.

3.Irregular collision sounds – Likely from fan blades hitting the housing cover.

三. Smell Detection

Use smell to identify potential faults:

1.A burnt odor near the junction box suggests excessive internal heat.

2.A strong scorched smell indicates insulation breakdown or winding burnout.

If no smell is detected but malfunction is suspected, measure the winding-to-case insulation resistance with a megohmmeter:

<0.5 MΩ: Requires drying.

0 Ω: Confirms damage.

四. Touch Inspection

Check motor temperature cautiously (use the back of your hand for safety):

Abnormal heat may stem from:

1.Poor ventilation (e.g., detached fan, blocked ducts).

2.Overloading (excessive current overheating windings).

3.Stator winding faults (short circuits or phase imbalance).

4.Frequent starts/stops.

5.Bearing overheating due to damage or insufficient lubrication.