| 摘要 |
<p>PURPOSE: To measure magnetic flux with high precision by dividing a magnetic pole piece into two magnetic pole piece parts, which are magnetically insulated from each other so that one is put in the other almost coaxially, by an annular gap, and putting a pickup element. CONSTITUTION: The electromagnet is constituted principally including a magnet housing 21, a solenoid 22, a movable plunger type armature 26, and fixed magnetic pole pieces 23 and 43 consisting of two parts. The annular gap 44 which is specially cylindrical for magnetic insulation is present between both the magnetic pole piece parts 23 and 43, and the pickup element 31 constituted as a Hall power generator is provided in the annular gap. Magnetic induction measured by the pickup element 31 is used as a measurement. The pickup element is neither damaged, nor exposed to liquid entering from a control valve, so it can display necessary performance for a long period.</p> |
