Electromagnetically moving device
AssigneeMitsubishi Electric Corporation
InventorsTomoko Takasuka, Mitsugi Mori, Mitsuru Tsukima
Life of this patent
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Abstract
In an electromagnetically moving device 100, a magnetic-flux variation measuring unit 3 is placed at a position which is outside a closed magnetic path established when a movable core 6 and a stationary core 5 are being attached to each other due to permanent magnets 7, and at which a leakage magnetic-flux variation due to movement of the movable core 6 can be measured, so that a behavior of a movable part in a switch, etc. is estimated such that an inflection point time is calculated from the measurement of time-series data of the magnetic-flux variation.
Claims20
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.
Dependencies are inferred from the claim text.