Abstract
In this study, a newly designed electro-magnetic proportional actuator composed of an armature and stator with multi convex teeth to control oil hydraulic valves was constructed and tested. Each of the convex teeth forms a magnetic pole, and when multiple magnetic poles produce a force simultaneously, a large thrust force is generated in the actuator. The dimensions of this actuator is60mm square, by101mm length. As a result of measurement of characteristics of this actuator, it became clear that its thrust force was constant within1mm of the armature stroke, producing about300N at electric power consumption of15W.
When the rise in the coil temperature of the actuator was measured, it became clear that the allowable maximum electric power consumption was 15W when the outer surface of the actuator is open to the atmosphere. Thrust force of this actuator is about 2.5 times as large as that of conventional proportional solenoids and linear motors of the same size and power consumption. In addition, the actuator has the potential to generate three times or more thrust force compared with conventional-proportional solenoids and linear motors by increasing the winding number of the coil and examining the shapes and sizes of the convex teeth and magnetic circuit.
