Some common problems that water pumps need to avoid in motor applications

Compared to other motors, motors paired with pumps face unique challenges due to the specific environment and load they operate in. If the environment where the pump is located is relatively clean and stable, the negative impact on the motor will be minimal. However, if the operating environment of the pump is poor, it is highly likely to cause unexpected issues during motor operation.

(1) If the environment where the pump is located is heavily polluted, it is very likely to cause motor overload issues. Pumps used for sewage treatment may experience difficulties due to the presence of sludge and debris in the medium being treated, leading to abnormal rotation of the pump impeller. The direct consequence is an increase in the load driven by the motor, which may lead to overload or even blockage problems. Therefore, overload protection for motors in such operating conditions is essential.

(2) Ensuring the protection level of the motor is crucial. For most motors paired with pumps, the surrounding environment is generally humid and may even be contaminated. Therefore, the selection and assurance of the motor's protection level are crucial. Key components and materials of the motor must have rustproof functions, especially in parts directly in contact with liquids, to prevent rust problems.

(3) Reliability assurance of the bearing system is vital. A repair unit undertook the repair of several vertical motors specifically paired with pumps, with the main issues focusing on rusting of the bearing system and contamination of the windings. After professional inspection and analysis, necessary measures were taken in terms of sealing of the motor bearing system and coordination of components, effectively solving the problem.

(4) For motors operating underwater, the requirements for protection, corrosion resistance, and explosion protection are even more stringent. According to the matching structure of the motor and pump, special requirements are placed on the protection level and electromagnetic wire of the motor. For example, some electromagnetic wires come into direct contact with liquids, making insulation performance assurance a crucial aspect distinct from ordinary motors.

(5) Motor starting control. In the actual application process of pumps, starting is crucial. Proper coordination between motor starting and water control is essential, and whether to use line-frequency motors or variable-frequency motors requires careful consideration. Users must communicate key information about starting with motor designers to avoid unnecessary troubles.

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