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In the previous report [1], a newly designed electro-magnetic actuator composed of an armature and a stator with multi-convex teeth to control oil hydraulic valves was introduced. Each of the convex teeth forms a magnetic pole, a large thrust force is generated in the actuator. This actuator produces about 300N at an electronic power consumption of 15W. This thrust force was examined experimentally by using a prototype actuator. In this study, magnetic flux flow in the actuator is investigated by using Finite Element Method Analysis. Difference of magnetic flux flow between several tooth shapes, and the flow of the front and rear edge of a tooth of the actuator are examined. Furthermore, to augment heat transfer of the actuator, the stator with fins made by round slots is examined.

A Study of a Multi-step Pole Type Electro-magnetic Actuator for Controlling Proportional Hydraulic Valve (Magnetic Flux Flow in the Actuator)