Large-displacement Electromagnetic Actuators Using the Meander Springs Partially Exposed to Magnetic Field

We present the design, fabrication and test of a large-displacement electromagnetic actuator using the meander springs, exposed partially to magnetic field. We compare two prototypes including the conventional prototype F with the meander springs exposed fully to magnetic field and the present prototype P with the meander springs exposed partially to magnetic field. In the experimental study, the amplitude of the prototype P is measured as 30.49±0.36μm at the 40mA square input current of 5Hz, while the amplitude of prototype F is measured as 26.02±0.65μm. The amplitude of the prototype P is 17.2% larger than that of the prototype F, verifying the effect of partial exposure of the meander springs to magnetic field. Therefore, we experimentally demonstrate the largedisplacement actuation performance of the present actuator using the partial exposure of the meander springs to magnetic field.