Patent ID: 8766580
Filing Date: 2014-07-01
Classification: F04D,H02P

Abstract:
1. A method for controlling a discharge pump of a household appliance, comprising the following steps: starting a synchronous electric motor that actuates said discharge pump until the synchronism condition is reached; driving said synchronous electric motor at normal operating speed through phase control by varying the firing angle (α); wherein, in driving said synchronous motor at steady state through phase control, said firing angle (α) is feedback controlled to cancel the phase difference between the mid-point of a zero current plateau of a function of the phase current fed to the electric motor and the zero-crossing point of a counter electromotive force signal (fcem) relative to the same phase; wherein, in feedback controlling the firing angle (α) the synchronous electric motor is switched off if the required firing angle (α) exceeds a maximum threshold (α