1. Resistance Measurement: Check if the windings are normal.
Use a multimeter in resistance mode to measure the resistance between the three leads of the motor:
Under normal circumstances, the minimum resistance + the second largest resistance = the maximum resistance (e.g., 80Ω, 120Ω, 200Ω).
If the resistance between any two leads is 0Ω, it indicates a short circuit in the windings; if it is ∞ (infinity), it indicates an open circuit, and the motor is damaged.
2. Mechanical Condition Inspection: Determine the bearings and rotor.
Manually rotate the motor shaft: After powering off, gently rotate the shaft; it should rotate smoothly without jamming. If it feels heavy or makes a "clicking" noise, it may indicate worn bearings or rotor misalignment.
Observe the casing condition: Check if the coils are blackened, and if the motor has cracks or corrosion. Blackening usually indicates overheating and burnout, and is beyond repair.
3. Operational Performance: Identifying Abnormal Sounds and Starting Issues
No Response After Power On: If pressing the start button produces no response, and the capacitor is normal, the motor may be burnt out.
Massaging Sound but No Turning: This indicates the motor has power but cannot start, possibly due to a partial short circuit in the windings or worn carbon brushes.
Slow Speed and Severe Vibration: If the spin-drying drum speed is significantly lower than 800 RPM, and clothes are not dried properly, it may be due to reduced motor power or aging windings.
⚠️ Safety Precautions: Always disconnect the power supply before any tests. Discharge the capacitor before measuring it to avoid the risk of electric shock. If the fault cannot be determined, it is recommended to have it handled by a professional.
