| 摘要 |
A switching device (1) comprising:
- at least a movable contact (11) and a fixed contact (12) that are adapted to be coupled or uncoupled during a switching operation of said switching device;
- an electromagnetic actuator (13) comprising an excitation coil (131), in which an excitation current (I E ) circulates during a switching operation, and a movable plunger (132), which is operatively coupled to said movable contact through a kinematic chain (14), said movable plunger being operated between a start position (P 1 ) and a stop position (P 2 ) during a during a switching operation;
- power supply means (16) that supply said excitation current to said excitation coil during a switching operation of said switching device;
- sensor means (15) that generate sensing signals indicative of the intensity of said excitation current;
- control means (17) for controlling the switching operations of said switching device, said control means receiving the sensing signals generated by said sensor means. During the execution of a switching operation, said control means:
- send a first control signal to said power supply means to start with the supply of said excitation current from a first instant (T 1 ) onwards;
- determine, on the base of the information provided by said sensing signals, a second instant (T 2 ), at which said power supply means have to stop with the supply of said excitation current, said second instant occurring before said movable plunger has reached said stop position (P 2 ) during the movement from said start position (P 1 ) towards said stop position (P 2 );
- send a second control signal to said power supply means to stop with the supply of said excitation current from said second instant (T 2 ) and until said movable plunger reaches said stop position. |
