Method for determining operating properties of a drill-rod borehole pump, and pump system for same

A method for determining operating properties of a drill-rod borehole pump, comprising a pump head, which is connected to a kinematics converter via a drill rod, and the kinematics converter is driven by an electric motor, and furthermore a measuring device is provided for measuring a power consumption of the motor during operation of same, the method comprising:

• a) measuring a current consumption and an operating voltage of the motor over at least one pump cycle, with which four operating phases of the borehole pump can be associated in each case, and determining the power consumption therefrom with power values,
• b) determining, for one pump cycle, a period and a maximum of the power consumption that corresponds to the torque maximum of the borehole pump,
• c) determining a reference phase angle for the kinematics converter with the aid of the properties of the kinematics converter and the power consumption of the motor, which reference phase angle describes a relationship between the maximum of the power consumption and the maximum of the force acting on the drill rod of the borehole pump,
• d) ascertaining a torque curve from the power consumption of the motor with the aid of the properties of the kinematics converter,
• e) determining the operating properties of the borehole pump from the torque curve ascertained in step d) using the period determined in step b) and the reference phase angle determined in step c).