Patent ID: 7695251
Filing Date: 2010-04-13
Classification: F04D

Abstract:
1. An electronic driving device for turning on and off a synchronous pump comprising a synchronous electric motor with a permanent-magnet rotor, comprising: at least a static power switch inserted in series between the motor and an AC electric power supply source; and a processing unit having at least an input receiving a synchronism signal (V) and a control output connected to said static power switch; wherein the electronic driving device is controlled by a signal emitted by a float level sensor and includes an input receiving a signal (α) by a position sensor detecting the rotor polarity and position; wherein the pump turn-on and off is regulated according to the signal emitted by said float level sensor and to a measured difference between a critical load angle (δ), computed in a working condition of the pump in which the signal emitted by the float level sensor corresponds to a high level condition, and a current load angle; wherein said critical load angle (δ) is a reference value for normal operation of the pump, with no risk of operation under vacuum conditions, and the pump is turned off when the difference between the stored critical load angle and a current mean value of the load angle is greater than a predetermined value.