Takashi Kenjo – författare
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3 produkter
3 produkter
Häftad, Engelska, 1991
1 102 kr
Skickas inom 7-10 vardagar
This is an introductory work explaining the principles, construction, and use of electric motors and their associated drive controls. It starts from school-level basic physics, but progresses to discuss state-of-the-art topics such as piezoelectric motors and vector control. It is largely non-mathematical in its approach and provides an uncluttered overview of the subject easily accessible to beginning students in electrical and electronic engineering as well as engineers and scientists from other disciplines. It is very well illustrated with precise and clear diagrams and photographs, and comes from the pen of a proven author and eminent engineer in the subject. Electric motors provide the motive power for information technology machinery: computer disk drives and printers; for domestic machinery: washing machines and air-conditioners; for industrial automation: conveyor belts and robots. Their abundance has been used as an index of a country's development.
Del 28 - Monographs in Electrical and Electronic Engineering
An Introduction to Ultrasonic Motors
Inbunden, Engelska, 1993
1 509 kr
Skickas inom 5-8 vardagar
The ultrasonic motor, invented in 1980, utilizes the piezoelectric effect in the ultrasonic frequency range to provide the motive force. (In conventional electric motors the motive force is electromagnetic). The result is a motor with unusually good low-speed high-torque and power-to-weight characteristics. It has already found applications in camera autofocus mechanisms, medical equipment subject to high magnetic fields, and motorized car accessories. Its applications will increase as designers become more familiar with its unique characteristics.This book is the result of a collaboration between the inventor and an expert in conventional electric motors: the result is an introduction to the general theory presented in a way that links it to conventional motor theory. It will be invaluable both to motor designers and to those who design with and use electric motors as an introduction to this important new invention.
Inbunden, Engelska, 2025
2 101 kr
Skickas inom 3-6 vardagar
The theory of relativity was created by Einstein in two stages, extending over a decade from 1905 to 1915. General relativity is said to be the most powerful tool that can be used to explain the behavior of the universe.In this book, we try to comprehend the universe with a fundamental formula known as the Pythagorean theorem, used as a vehicle to review the essence of Euclidean geometry and non-Euclidean geometry, then move on to Newtonian mechanics, and review the historical development of electromagnetism, setting the stage for special relativity. Next, we describe Einstein's efforts to generalize his theory to include gravitation, which led to a geometric theory of spacetime: the gravitational field equations. The German astronomer Schwarzschild quickly solved these equations for a special case. Also presented are the numerical graphical results of the planetary orbits and light trajectories using the Python code that we created. Then the reader is taken on an excursion to the physics of the microcosm, describing how special relativity was instrumental in the development of quantum theory, and how several Japanese physicists contributed to atomic and particle physics. Finally, we end the book by introducing the work of Roger Penrose on black holes, which is closely related to Schwarzschild's solution, and the existence of intrinsic singularity at the center of black holes. In his intriguing theory of Conformal Cyclic Cosmology, our universe may be one in a never-ending birth-and-death cycle of universes.