Abstract
Several air cylinders are employed in complex equipment in pebble-bed high temperature gas-cooled reactor. They were designed to actuate remote movements in radioactive environment. An electromagnetic self-locking device was designed to lock them in safe position when the compressed air source is offline by accident. But the disadvantageous temporary standstill of armature in unlocking process still needed to be eliminated. Maxwell 2D transient analysis was performed to simulate the armature motion and compared with the experimental results. A comprehensive understanding was then achieved, and the parallel capacitor solution to the standstill problem was developed. With further numerical simulation and experimental verification, the self-locking device with capacitor connection was optimized. The armature motion was accelerated and the standstill was eliminated. The maximum temperature rise did not exceed the material limit value yet. The as-improved device would help guarantee the fail-safe feature of the cylinders.
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