The performance of the washing machine spin dryer motor directly affects the spin dryer effect and overall operation stability of the washing machine as an important driving component of the washing machine.
The motor does not rotate or the speed is too low
The motor cannot start or the speed is significantly lower than the design value, which is one of the most common faults of the washing machine spin dryer motor. This fault may be caused by abnormal power supply, open circuit or short circuit of the winding, carbon brush wear (for brushed motors), failure of the starting capacitor, etc.
Diagnostic method:
Use a multimeter to detect the resistance value of the motor winding to determine whether there is an open circuit or short circuit.
Check whether the capacitor capacity is normal and replace the starting capacitor if necessary.
Observe whether the power supply voltage is stable to eliminate power supply problems.
For brushed motors, check the wear of the carbon brushes and replace them if necessary.
Use an oscilloscope to detect the motor drive signal and troubleshoot control circuit problems.
Abnormal noise and vibration
Abnormal noise or vibration during the operation of the spin dryer motor is usually caused by mechanical failure or electrical abnormality. Mechanically, it may be bearing wear, rotor imbalance or improper motor installation. Electrically, it may be damaged windings causing uneven magnetic fields.
Diagnostic method:
Use a vibration analyzer to detect vibration frequency and amplitude and locate abnormal parts.
Physically check the bearing status to confirm whether it is insufficiently lubricated or damaged.
Check whether the rotor is deformed or eccentric, and perform balancing correction if necessary.
Use an infrared thermometer to detect the operating temperature of the motor. Abnormally high temperature may indicate a winding failure.
Observe the sound changes when the motor is working, and use spectrum analysis to assist in diagnosis.
Overheating failure
Overheating of the spin dryer motor will cause insulation aging, winding damage and even motor burnout. Overheating is mostly caused by excessive load, abnormal current, poor heat dissipation or high ambient temperature.
Diagnostic method:
Monitor the running current of the motor. When it exceeds the rated current, check for load and circuit abnormalities.
Check whether the motor cooling system is effective and whether the fan is running normally.
Use a thermal imager to detect the temperature distribution on the surface and inside of the motor.
Check the insulation resistance test results to determine whether the winding insulation is damaged.
Check whether the washing machine load is even to avoid overload operation.
Frequent motor tripping or protection action
Frequent tripping is usually related to motor overcurrent, overheating or electrical short circuit. The protection action of the motor control system is an important mechanism to prevent further damage.
Diagnostic method:
Monitor the actual working current through the current clamp meter to confirm whether it exceeds the protection setting.
Use an insulation resistance meter to detect the insulation status between the motor winding and the housing.
Check the working status of the motor control module and related protection components.
Observe whether there is poor contact caused by loose wiring or circuit aging.
Check whether the control system software parameter settings are reasonable.
Difficult to start or vibrate to start
The motor is difficult to start or vibrates violently during startup, which may be due to damage to the starting capacitor, abnormal gap between the rotor and the stator, mechanical jamming or abnormal control signal.
Diagnostic method:
Test the capacity and performance of the starting capacitor to ensure that it meets the specification requirements.
Physically check whether the motor rotates smoothly without jamming.
Measure the gap between the rotor and the stator to confirm that there is no abnormal wear or foreign matter.
Use an oscilloscope to check the voltage waveform at startup and check the quality of the control signal.
Check whether the motor is installed firmly to prevent resonance.
Abnormal or unstable motor direction
Wrong direction or unstable operation of the spin motor directly affects the spin effect of the washing machine, which is usually caused by incorrect motor wiring, drive circuit failure or abnormal sensor signal.
Diagnostic method:
Check the motor winding wiring to ensure that the connection conforms to the circuit design.
Detect the driver output signal to confirm whether the logic and frequency are normal.
Check the speed sensor or Hall sensor signal integrity.
Troubleshoot the control module fault through the control system self-test function.
Monitor the motor load changes to confirm whether there is mechanical obstruction.
