Abstract
Along with the development in digital camera industry recently, the performance and control accuracy of today’s linear actuators has been much improved as well together with compactness and energy saving also being achieved. Hence, in this thesis, the basic structure, magnetic circuit, and operational principle of voice-coil motors are first discussed according to the various types of conventional designs. Then, Halbach magnetic theory was employed for designing a novel voice-coil motor with further analysis on basic magnetism with the help of computer aided engineering tools in order to achieve the goals. For further experimental verifications of practical design on permanent magnet, two types of configurations were proposed, namely four-piece trapezoidal and eight-piece square-grid. From the experimental results measured by fundamental instrumentation, average errors between the experiments and simulations are roughly 5 %. The design procedures for permanent magnets without soft magnetic materials have been established by making use of NdFeB magnets with 0.9 T in the air gap. Moreover, fundamental and standard design and manufacture process has been fulfilled on high-power voice-coil actuators in this thesis.