Wiring method and solution of desk fan

Connect the capacitor at both ends with the greatest resistance.

The power supply and the timer are connected in series and then connected with the key switch.

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Common faults and solutions of desk fan connection.

Fault: 1, the fan blade does not turn, and the motor buzzes.

Cause: The power supply voltage is too low. Measures: Measure the power supply voltage with a multimeter.

Cause: The main winding or secondary winding of the motor is open. Measurement: Measure the motor winding with multimeter.

Cause: Internal short circuit of motor winding. Measures: Touch the motor housing with your hand to see if it is hot, and measure whether the current is too large with a multimeter. If so, it means that the winding is short-circuited, so the motor can only be replaced or the winding can be rewound.

2. The blades don't turn and the motor doesn't hum.

Cause: Contact desoldering or broken connecting wire. Measures: disassemble the base of the table fan, carefully check the solder joints and connection points, and reconnect them if they fall off.

Cause: Bad contact of timer contact. Measures: Replace the timer.

3. It's hard to start.

Cause: The rotor is not concentric with the stator or bearing. Measures: After removing the fan blades, twist the rotating shaft by hand to check whether the rotation is flexible. If there is obvious blockage, adjust the concentricity of the motor.

Cause: Poor lubrication between rotating shaft and bearing. Measures: Check whether the rotating shaft rotates flexibly. If the blockage is caused by poor lubricating oil, it can be carefully cleaned with gasoline. After cleaning, add some light engine oil, such as sewing machine oil, to the oil-bearing

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