The power supply voltage is high, exceeding the additional voltage of the motor by more than 10%, causing an increase in motor iron loss and causing the motor to heat up. DC brushless water pump

If the power supply voltage is too low, more than 5% lower than the additional voltage of the motor, the motor will generate heat when operating under additional load. The solution is to adjust the level of the transformer tap changer and bring the power supply voltage within the normal range. The three-phase power supply voltage is unbalanced, and the phase to phase voltage imbalance exceeds 5%, causing three-phase current imbalance and causing the motor to heat up. Phase deficient operation.

If the motor load is too high, the load should be reduced or a motor with suitable capacity should be replaced. If the motor is started too frequently, there may be mechanical load problems.

Reasons why brushless DC motors cannot be started

Lack of power supply voltage or poor contact;

The control circuit of the brushless DC motor controller is not connected or missing;

Damage to the motor Hall, insulation degradation of the motor coil leading to burning, and demagnetization of the motor rotor magnetic steel;

The motor load far exceeds its own load torque;

The power supply voltage is too high or unstable.

How do DC brushless water pumps generate noise and vibration inside

The magnetic slot effect generated by electromagnetic noise magnetic field produces magnetic force when the magnet in the rotor cuts the stator teeth. When the magnetic force shifts from one tooth to another, it assists or prevents rolling, causing the rotor to accelerate or decelerate in a regular manner. The tooth groove effect caused by uneven magnetic pulling force. Other noises include improper fit of bearings and end caps, as well as excessive axial clearance, which can generate noise.

There are two options that have not been planned yet, one that has already been developed and planned, and the other that has not been planned in the early stage: to refine the motor planning, we need to consider the overall situation, starting from the selection of tooth slots, and then compensating for details such as structure, process, and parameters. This can also achieve high power density, high efficiency, and low noise, which can be achieved by planning the timing of magnetic steel and punching plates. The mold has already been opened: increasing the air gap length, reducing the thickness of the magnetic steel, reducing the magnetic density, etc. DC brushless water pump

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