| 摘要 |
An automatic pump and an operation control method for the same are disclosed. The disclosed pump and method operate in response to fluctuations in the internal pressure of a housing forming a fluid path inside the automatic pump for making selective switching connections with variable winding counts of a stator coil of the pump motor and thereby shifting the rotational speed of the motor to an appropriate one of multi-stage rotational speeds or stop the motor. Such a consequently obviated inverter used in conventional automatic pumps offers cost reduction and pump compactness. |
