The efficiency of the brushless DC pump is the product of the three efficiencies of mechanical, volume and hydraulic power. The efficiency of the brushless DC pump is the product of the pump efficiency and the motor efficiency. The main factors that cause the low efficiency of the brushless DC pump are as follows:
1. The efficiency of the pump itself is fundamental. Pumps under the same working conditions may differ in efficiency by more than 15%.
2. The operating conditions of the brushless DC pump are lower than the rated operating conditions of the pump, with low pump efficiency and high energy consumption.
3. The efficiency of the motor remains basically unchanged during use. Therefore, choosing a high-efficiency motor is very important.
四、機械效率的影響主要與設計及制造質量有關。泵選定后，后期管理影響較小。
五、水力損失包括水力摩擦和局部阻力損失。無刷直流水泵運行一定時間后，不可避免地造成葉輪及導葉等部件表面磨損，水力損失增大，水力效率降 低。
六、無刷直流水泵的容積損失又稱泄漏損失，包括葉輪密封環、級間、軸向力平衡機構三種泄漏損失。容積效率的高低不僅與設計制造有關，更與后期 管理有關。泵連續運行一定時間后，由于各部件之間摩擦，間隙增大，容積效率降低。
七、由于過濾缸堵塞、管線進氣等原因造成離心泵抽空及空轉。
