This thesis discusses the operation of volumetric TMC pumps. To explain the flow properties on the pump output, we compared the pump with unmodified runner, with pumps with differently modified runner. With measurements of charateristic curves and pressure fluctuations on the pump outlet, we explained the operation of pumps with unmodified, partly modified and fully modified single vane of the pump runner. Characteristic curves were measured for different rotating frequencies and modifications of the pump runner. We related the pressure fluctuations on the pump outlet to the modifications of the pump runner vane and found out how the internal leakage influences the pressure fluctuations. Pressure fluctuations were independent of rotating frequency of the runner and were generated as a consequence of properties of the flow at the pump outlet. By measuring the voltage of the Hall sensor we measured the axial movements of the motor rotor. We found out, that the motor rotor was shifted towards the pump runner in the case of high operating pressure. Calibration of Hall sensor was also performed.
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