| 摘要 |
The invention relates to a method for diagnosing operating states ( 36, 38, 40, 42 ) of a synchronous pump in a liquid circuit, particularly in a washing machine or similar. According to the inventive method, the alternating voltage (U) applied to the pump motor and the alternating current ( 1 ) of the motor are measured in at least one measurement step ( 30 ), the extent of a phase shift (Deltaphi) between the alternating voltage (U) and the alternating current is measured at least at one point in time in a determination step ( 32 ), the phase shift (Deltaphi) or the progress thereof is determined from the recorded measured values and a characteristic of the phase shift (Deltaphi) or the progress thereof is determined, and the determined characteristic is assigned to a predetermined pump operating state ( 36, 38, 40, 42 ) in an assignment step ( 34 ).
|
