The key difference between a synchronous motor water pump and an induction (asynchronous) motor water pump lies in the rotor speed. In a synchronous motor, the rotor rotates at the same speed as the magnetic field in the stator. In contrast, the rotor in an induction motor moves at a slightly slower speed than the stator’s magnetic field. This distinction affects their performance and applications, making each type of motor suitable for different water pumping needs depending on the required efficiency, torque, and speed control.