Dynamic Analysis of High-Speed Three-Degree-of-Freedom Electromagnetic Actuator for Image Stabilization

Recently, a high-quality image has been obtained by a video camera because of its improved imaging performance. However, image quality deteriorations due to vibration have become a problem. In order to solve this problem, various image stabilization technologies have been developed. A lens-unit-swing system which consists of a lens and an imaging device is one of the image stabilization technologies that generate an inverse motion and correct images from camera shakes over a wide range of rotation angles around three axes. However, the lens-unit-swing system has some problems such as an increase in size and weight. On the other hand, recently, various multiple-degree-of-freedom (DOF) actuators have been developed. These actuators are expected to simplify the system. In this paper, we propose a high-speed three-DOF electromagnetic actuator for image stabilization which can be controlled by a simple control system. The basic structure and operating principle of the actuator are described. Moreover, the frequency characteristics are calculated by the transfer function and 3-D finite-element method. In addition, the dynamic characteristics under the position feedback control are analyzed and the effectiveness of the actuator is verified.