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Common faults and noise solutions of DC brushless water pumps

Published:2021-07-26

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Reasons for the high temperature of the DC brushless water pump

The power supply voltage is high, more than 10% of the rated voltage of the motor, causing the iron loss of the motor to increase, and the motor heats up.


The power supply voltage is too low, less than 5% of the rated voltage of the motor, and the motor will generate heat when running at the rated load.

 

The solution is to adjust the grade of the transformer tap switch and adjust the power supply voltage to within the normal range. The three-phase power supply voltage is unbalanced, and the voltage unbalance between phases exceeds 5%, causing the three-phase current unbalance and causing the motor to heat up. If the motor load is too large, the load should be reduced or a motor with a suitable capacity should be replaced, and the start-up is too frequent.

 

Reasons why the brushless DC motor cannot start:

  -Insufficient power supply voltage or poor contact

  -The control circuit of the brushless DC motor controller is not connected or connected less

  -Motor Hall is damaged, motor coil insulation is reduced, causing burnout, and motor rotor magnets lose magnetization

  -The motor load far exceeds its own load torque

  -The power supply voltage is too high or unstable

 

How to generate noise and vibration inside the DC brushless water pump:

Electromagnetic noise The magnetic slot effect produced by the magnetic field, which produces magnetic force when the magnets in the rotor cut the stator teeth. When the magnetic force is transferred from one tooth to another tooth, the magnetic force helps or prevents the rotation and makes the rotor accelerate or decelerate regularly. Cogging caused by uneven magnetic tension. Other noises include unreasonable matching of bearings and end covers, and large axial clearances, etc., will cause noise.

 

Some issues that should be paid attention to in scheme design:

Not designed well in the early stage: The detailed design of the motor must be considered globally, starting from the selection of the cogging, and then compensating for the details of the structure, process, parameters, etc., it can also achieve the effects of high power density, high efficiency, and low noise. Yes, you can work hard from the design of magnets and punching sheets.

 

The mold has been opened: increase the length of the air gap, reduce the thickness of the magnetic steel, and reduce the magnetic density.


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