This book extends the conventional two-dimensional (2D) magnet arrangement into 3D pattern for permanent magnet linear machines for the first time, and proposes a novel dual Halbach array. It can not only effectively increase the radial component of magnetic flux density and output force of tubular linear machines, but also significantly reduce the axial flux density, radial force and thus system vibrations and noises. The book is also the first to address the fundamentals and provide a summary of conventional arrays, as well as novel concepts for PM pole design in electric linear machines. It covers theoretical study, numerical simulation, design optimization and experimental works systematically. The design concept and analytical approaches can be implemented to other linear and rotary machines with similar structures. The book will be of interest to academics, researchers, R&D engineers and graduate students in electronic engineering and mechanical engineering who wish to learn the core principles, methods, and applications of linear and rotary machines.

By tracing the history of Yudahua from the late nineteenth century to the middle of the twentieth century, this study analyzes a successful inland business model among textile companies in modern China. The steady growth of this enterprise relied primarily on its strategy to focus on low-end markets to locate new mills in underdeveloped interior regions. This strategy further allowed the enterprise to pioneer industrialization in its host localities, demonstrating a major social and economic impact on the local societies. At the same time, Yudahua's unique team leadership pattern-five leading families shared its ownership and management-made the business an atypical family firm and allowed relatively easy institutional departure from Chinese social networks and adoption of Western corporate hierarchy. Therefore, by the late 1940s, Yudahua had gradually developed into a fairly integrated business group with a unified management structure and routinized connections between its member mills, which differed noticeably from the loose alliances normally found in other early twentieth-century Chinese business conglomerates.

This book extends the conventional two-dimensional (2D) magnet arrangement into 3D pattern for permanent magnet linear machines for the first time, and proposes a novel dual Halbach array. It can not only effectively increase the radial component of magnetic flux density and output force of tubular linear machines, but also significantly reduce the axial flux density, radial force and thus system vibrations and noises. The book is also the first to address the fundamentals and provide a summary of conventional arrays, as well as novel concepts for PM pole design in electric linear machines. It covers theoretical study, numerical simulation, design optimization and experimental works systematically. The design concept and analytical approaches can be implemented to other linear and rotary machines with similar structures. The book will be of interest to academics, researchers, R&D engineers and graduate students in electronic engineering and mechanical engineering who wish to learn the core principles, methods, and applications of linear and rotary machines.