1. Hall Sensor Damage

The mini air blower usually adopts a brushless DC motor that relies on the feedback of the Hall sensor to control the rotation speed and direction. If the Hall sensor is damaged due to various reasons, such as overheating, overload, vibration, or manufacturing defect, the motor may not start or stop abruptly. To check if the Hall sensor is working, you can use a multimeter to measure the voltage or resistance of the sensor pins and compare them with the specifications provided by the manufacturer. If the readings are abnormal, you may need to replace the Hall sensor or the entire motor unit.

 

2. Loose Wire Connection

Another reason why the mini air blower cannot start is the loose wire connection between the motor and the driver or the power supply. Sometimes, the wires may loosen or break due to mechanical stress, corrosion, or poor soldering. To check if the wire connection is good, you can use a continuity tester or a voltmeter to measure the voltage or resistance between the wire ends and the corresponding pins or terminals. If there is no continuity or voltage, you need to repair or replace the wire or the connector.

 

3. Coil Burnout

The mini air blower may also fail to start if the coil inside the motor is burnt out. The coil can be burned due to various reasons, such as high temperature, overcurrent, voltage fluctuation, or insulation breakdown. To check if the coil is good, you can use an ohmmeter or a megohmmeter to measure the resistance or insulation resistance of the coil. If the reading is too high or too low, you may need to replace the coil or the motor unit.

 

4. Driver Failure

The mini air blower driver, which converts the DC voltage from the power supply into the three-phase AC voltage that drives the motor, may also fail due to various reasons, such as overvoltage, overcurrent, short circuit, or component failure. To check if the driver is working, you can use an oscilloscope or a logic analyzer to monitor the waveform or signal of the driver output and compare it with the expected wave or signal. If the waveform or signal is abnormal, you may need to replace the driver or the motor unit.

 

5. Water Intake and Corrosion

The mini air blower may also experience problems if water or other liquids are sucked into the blower chamber, which can corrode or short-circuit the Hall sensor or the coil. To prevent water intake, you should install a filter or a cover on the blower inlet or outlet, and avoid placing the blower in a humid or wet environment. If water already enters the blower, you should disassemble the blower, dry the affected parts with a hair dryer or a vacuum cleaner, and clean the corrosion with a soft brush or a cleaning agent.

 

6. Loose Terminal Connection

The mini air blower may also fail to start if the terminal connection between the wire and the connector is loose or detached, which can cause electrical discontinuity or sparking. To check if the terminal connection is good, you can use a magnifying glass or a microscope to inspect the terminal pin or socket and the wire crimp or solder joint. If there is any looseness or damage, you should re-crimp or re-solder the wire or replace the connector.

 

7. Poor Contact due to Coating

Sometimes, the mini air blower may also have poor contact due to the three-proof varnish sprayed on the connector pins, which can insulate or corrode the contact surface. To solve this issue, you can use a sharp tool or a file to remove the coating gently and expose the metal surface underneath, or replace the connector with a better-specified one.

 

8. Overheating Protection

Lastly, the mini air blower driver may also stop working due to the overheating protection mechanism, which is designed to prevent the driver from being damaged by excessive temperature. If the driver overheats, it will shut down automatically and require a cool-down period before it can resume working. To avoid overheating, you should ensure that the driver is installed in a well-ventilated and cool environment, and that the airflow of the blower is not obstructed or restricted.