Electromagnetically moving device

1. An electromagnetically moving device, comprising:

a movable core;

a stationary core with which the movable core is provided in a releasably attachable manner thereto and a permanent magnet is provided so as to attract the movable core, said stationary core being provided at a position where it forms, when the movable core is not attached thereto, a magnetic path without going through the permanent magnet;

a stopper plate which is provided at a position where the movable core reaches its moving end after being separated from the stationary core, and is made up of a magnetic member;

a support column for supporting the stopper plate, which is fixed to the stationary core, and is made up of a magnetic member;

a drive coil which, when a driving current is applied thereto, causes the movable core to move; and

a magnetic-flux variation measurer:

which is provided on the support column placed outside a closed magnetic path that passes attached surfaces of the movable core and the stationary core when the movable core and the stationary core are being attached to each other; and

which measures a leakage magnetic-flux variation that emerges in the support column at the time the movable core moves due to a magnetic force generated when the driving current is applied to the drive coil.

2. The electromagnetically moving device according to claim 1 , further comprising a behavior estimator which estimates an operation status of the movable core on the basis of: time-series data of the magnetic-flux variation measured by the magnetic-flux variation measuring device; and reference-value data.

3. The electromagnetically moving device according to claim 2 , wherein the behavior estimator has prestored the reference-value data.

4. The electromagnetically moving device according to claim 3 , wherein the behavior estimator deletes the prestored reference-value data to thereby update the reference-value data.

5. The electromagnetically moving device according to claim 2 , further comprising a status determinator which determines whether or not an abnormality occurs in a switching apparatus connected to the movable core, on the basis of an output of the behavior estimator.

6. The electromagnetically moving device according to claim 3 , further comprising a status determinator which determines whether or not an abnormality occurs in a switching apparatus connected to the movable core, on the basis of an output of the behavior estimator.

7. The electromagnetically moving device according to claim 4 , further comprising a status determinator which determines whether or not an abnormality occurs in a switching apparatus connected to the movable core, on the basis of an output of the behavior estimator.

8. The electromagnetically moving device according to claim 5 , wherein the behavior estimator estimates a status of a movable contact and a stationary contact opposite to the movable contact, in the switching apparatus.

9. The electromagnetically moving device according to claim 6 , wherein the behavior estimator estimates a status of a movable contact and a stationary contact opposite to the movable contact, in the switching apparatus.

10. The electromagnetically moving device according to claim 7 , wherein the behavior estimator estimates a status of a movable contact and a stationary contact opposite to the movable contact, in the switching apparatus.

11. The electromagnetically moving device according to claim 5 , further comprising a notificator which makes notification of a behavior estimation result by the behavior estimator or a status determination result by the status determinator, to the outside.

12. The electromagnetically moving device according to claim 6 , further comprising a notificator which makes notification of a behavior estimation result by the behavior estimator or a status determination result by the status determinator, to the outside.

13. The electromagnetically moving device according to claim 7 , further comprising a notificator which makes notification of a behavior estimation result by the behavior estimator or a status determination result by the status determinator, to the outside.

14. The electromagnetically moving device according to claim 8 , further comprising a notificator which makes notification of a behavior estimation result by the behavior estimator or a status determination result by the status determinator, to the outside.

15. The electromagnetically moving device according to claim 9 , further comprising a notificator which makes notification of a behavior estimation result by the behavior estimator or a status determination result by the status determinator, to the outside.

16. The electromagnetically moving device according to claim 10 , further comprising a notificator which makes notification of a behavior estimation result by the behavior estimator or a status determination result by the status determinator, to the outside.

17. The electromagnetically moving device according to claim 1 , wherein multiple magnetic-flux variation measurers, each being said magnetic-flux variation measurer, are provided.

18. The electromagnetically moving device according to claim 2 , wherein multiple magnetic-flux variation measurers, each being said magnetic-flux variation measurer, are provided.

19. The electromagnetically moving device according to claim 17 , wherein an operation status of the movable core is estimated on the basis of time-series data outputted from the multiple magnetic-flux variation measurers.

20. The electromagnetically moving device according to claim 18 , wherein an operation status of the movable core is estimated on the basis of time-series data outputted from the multiple magnetic-flux variation measurers.