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Electromagnetic driving device and flow rate controlling apparatus employing the same driving device

  • US 20020101314A1
  • Filed: 01/25/2002
  • Published: 08/01/2002
  • Est. Priority Date: 01/26/2001
  • Status: Active Grant
First Claim
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1. An electromagnetic driving device comprising;

  • a movable core, a stator having a housing portion for housing said movable core in such a manner as to move in a reciprocating fashion therein and an attracting portion between which and said movable core a magnetic force is generated for attracting said movable core to one of reciprocating movement directions and cooperating with said movable core to form a magnetic circuit, a coil for generating a magnetic force which attracts said movable core to said attracting portion side when energized, and a non-magnetic layer formed on at least one of sides where said housing portion and said movable core are situated, respectively, to diametrically face each other, and wherein R defined as (d1/d0

    100 is set so as to satisfy 20%≦

    R≦

    60%, when a magnetic gap which is formed in a radial direction between the housing portion and the movable core and excludes the nonmagnetic layers is defined as d0 and air gap which is formed in a radial direction between the housing portion and the movable core and includes the non-magnetic layers when the movable core does not deviate from, but remains coaxial with, the housing portion defined as d1, and wherein any of said attracting portion, said housing portion and said plunger portion becomes saturated magnetically when the value of electric current that is supplied to said coil increases to reach a predetermined value which falls between 40% or larger and 60% or smaller of a maximum value of electric current that is supplied to said coil.

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