Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Tae Hyun Kim

Tomotaka Yano

Hiroshi Kigawa

Kenji Shimohata

Akihiko Imagi

Toshie Takeuchi

Tatsuo Matsuoka

Osamu Takahara

Hiroshi Nishizawa

Tadahiro Yoshida

Ryuichi Nishiura

Akihiko Maruyama

Yo Makita

A switching contact, an electromagnetically operated electromagnet for driving the switching contact, and a drive power source device for driving the electromagnetically operated electromagnet. The electromagnetically operated electromagnet includes a movable core coupled to a movable contact of the switching contact, a fixed core located in a peripheral portion of the movable core, and coils wound around the movable core and the fixed core. Currents are supplied to the coils to drive the movable core. Capacitors store charges for supplying the current to the coils. Resistors are arranged in series with a path through which the capacitors are connected with the coils of the electromagnetically operated electromagnet and through which a current for closing operation flows. Capacitances of the capacitors and values of the resistors are controlled to adjust a supplied current characteristic to the electromagnetically operated electromagnet.

Electromagnetically operated switching device

A switchgear apparatus is provided in which an impact induced by a close operation is mitigated, featuring space saving and high reliability with low costs. The switchgear apparatus includes a switching unitthat is composed of a fixed electrodeand a movable electrode; a movable shaftthat is extended from the movable electrode; an operating mechanismthat produces driving force and transfers the driving force to the movable shaft; a switching-unit holderthat holds the switching unitand the movable shaftthereinside; and a holder supporting unitthat has a fixing plane so as to fix the switching-unit holderthereonto. The switchgear apparatus is arranged in such a manner that the holder supporting unitserving as the fixing plane is constituted of a plurality of plates layered in the axial direction along the movable shaft. In a case of the close operation, because kinetic energy in the overall system is consumed by the friction generated between the layered plates owing to distortion of the layered plates, energy that allows the movable electrodeto bounce back and forth is lowered, so that it is possible to shorten a chattering time.

Switchgear apparatus

An actuator used in a safety stop device for an elevator has: a movable portion displaceable between an actuation position where the safety stop device for the elevator is actuated and a normal position where the actuation of the safety stop device is released; and an electromagnetic coil for displacing the movable portion when a current flows through the electromagnetic coil. A device for inspecting operation of the actuator has a feeder circuit for supplying an amount of electricity required for a semi-operation which is less than that required for a full operation for displacing the movable portion from the normal position and the actuation position to the electromagnetic coil.

Method for inspecting operation of actuator and actuator operation inspector

An actuator has a driving first coil and a driving second coil. A capacitor is electrically connected to both the first coil and the second coil through a discharge switch using electric power accumulated in a capacitor which can be selectively supplied. An operation portion for operating the discharge switch is electrically connected to the discharge switch. For example, when an electric power supplied to the operation portion is cut due to a power failure, the second coil and the capacitor are electrically connected to each other through the discharge switch.

Actuator driving method and actuator driving circuit

A core is divided by alternately arranging plural magnetic material portions and plural non-magnetic material portions in a circumferential direction of the core through which a primary conductor penetrates. A conductor is wound around the core under conditions in which each core cross section of the core intersects the magnetic material portion and the non-magnetic material portion, each core cross section including a cut end surface of each conductor of a secondary winding wound around the core, and a ratio of a magnetic material portion cross-sectional area of the magnetic material portion to a non-magnetic material portion cross-sectional area of the non-magnetic material portion at the core cross section is kept constant at each core cross section.

Current sensor

Growing community of inventors

Tokyo, Japan

Tae Hyun Kim