1. Check the power supply: First check whether the power supply of the washing machine is normal, whether the plug is loose, and whether the wire is worn or damaged.
2. Check the motor rotor: Open the washing machine to check whether the motor rotor rotates smoothly and whether the rotor has abnormal sound or friction.
3. Check the motor coil: Measure the impedance of the motor coil with a multimeter to determine whether the coil is normal and whether the impedance value is consistent with the specification.
4. Check the motor drive circuit: check whether the motor drive circuit is normal, including whether the motor drive chip, capacitor, resistor and other components are damaged or aging.
5. Check the sensor: If the washing machine is equipped with a sensor, check whether the sensor is normal, whether it can read the motor running state and control the motor running speed.
6. Check the motor control board: If the above checks are normal, then there may be a problem with the motor control board and it needs to be replaced or repaired.
A multimeter can also be used to detect, it must be determined that the Hall has a 5v signal input, and then measure the voltage of the three signal lines to the negative electrode, and slowly turn the motor by hand when measuring, the signal line voltage will jump back and forth between 0v and 5v, and the same is bad
Dc brushless motor detection methods are as follows:
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1, first hand turn the motor shaft, feel whether it is smooth, measure the motor line resistance with a multimeter, and measure the Hall, while measuring the Hall, hand turn the motor shaft, observe the resistance value.
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2, the use of a multimeter to detect it, the method is: the multimeter range to 10V DC voltage, the pen is linked to the two electrodes of the motor, rotate the motor rotor by hand, if the needle is biased to one side, it proves that the motor is good; If it doesn't move, it's bad. Principle: Permanent magnet DC motor can also be regarded as a generator.