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EP0225388A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Electromagnetic actuator

Assignee: Mitsubishi Mining and Cement Co Ltd
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Filing: 1985-06-04
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Granted: —
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Expires: 2005-06-04
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Abstract

Abstract A first invention is concerned with an electromagnetic actuator comprising: a closed magnetic path formed by a fixed magnetic piece, a moving magnetic piece, and gaps defined by said fixed magnetic piece and said moving magnetic piece that come into contact with each other and move away from each other; an electric winding for exciting said closed magnetic path; and a permanent magnet which bridges a pair or opposing sections of said fixed piece in said closed magnetic path to apply a magnetomotive force. A second invention is concerned with an electromagnetic actuator comprising: a closed magnetic path formed by a fixed magnetic piece of the form of a closed loop; an electric winding for exciting said closed magnetic path; and a moving piece consisting of a permanent magnet which bridges a pair of opposing sections of said closed magnetic path via gaps to apply a magnetomotive force.

Inventors

  • 👤 Tokio Uetsuhara

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 09:30
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01H; H01H51/00; H01H51/22; H01H51/2209; H01F7/16; H01F7/1607; H01F7/1615; H01F7/1638; H01F7/1646; H01F7/121; H01F7/122; H01F7/124; H01H2051/2218

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 62 words
An electromagnetic actuator comprising a closed magnetic circuit consisting of a magnetic stationary member, a magnetic movable member and gaps defined between them; an electric coil for energizing the closed magnetic circuit; and a permanent magnet bridgingly disposed between a pair of restricted sections, facing each other, of the stationary memebr so as to apply magnetomotive force to the closed magnetic circuit.
Claim 2
Dependent Claim 62 words
An electromagnetic actuator comprising a closed magnetic circuit consisting of a magnetic stationary member, a magnetic movable member and gaps defined between them; an electric coil for energizing the closed magnetic circuit; and a permanent magnet bridgingly disposed between a pair of restricted sections, facing each other, of the stationary memebr so as to apply magnetomotive force to the closed magnetic circuit.
Claim 3
Dependent Claim 69 words
An electromagnetic actuator comprising a closed magnetic circuit consisting of a magnetic stationary member in a closed loop shape; an electric coil for energizing the closed magnetic circuit; and a movable member made of a permanent magnet, which member is bridgingly connected between a pair of restricted sections, facing each other, of the closed magnetic circuit through gaps so as to apply magnetomotive force to the closed magnetic circuit.
Claim 4
Dependent Claim 69 words
An electromagnetic actuator comprising a closed magnetic circuit consisting of a magnetic stationary member in a closed loop shape; an electric coil for energizing the closed magnetic circuit; and a movable member made of a permanent magnet, which member is bridgingly connected between a pair of restricted sections, facing each other, of the closed magnetic circuit through gaps so as to apply magnetomotive force to the closed magnetic circuit.

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