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Modern Permanent Magnet Electric Machines Theory and Control

Modern Permanent Magnet Electric Machines Theory and Control

The late 1980s saw the beginning of the PM brushless machine era with the invention of high-energy density permanent magnets (PM) and the development of power electronics. Although induction motors are now the most popular electric motors the impact of PM brushless machines on electromechanical drives is significant. Today PM machines come second to induction machines. Replacement of electromagnetic field excitation systems by PMs brings the following benefits: No electrical energy is absorbed by the field excitation system and thus there are no excitation losses causing substantial increase in efficiency Higher power density (kW/kg) and/or torque density (Nm/kg) than electromagnetic excitation Better dynamic performance than motors with electromagnetic excitation (higher magnetic flux density in the air gap) Simplification of construction and maintenance Less expensive for some types of machines Modern Permanent Magnet Electric Machines: Theory and Control serves as a textbook for undergraduate power engineering students who want to supplement and expand their knowledge in the fundamentals of magnetism soft magnetic materials permanent magnets (PMs) calculation of magnetic circuits with PMs modern PM brushed DC machines and their controls modern PM brushless DC motors and drive control and modern PM generators. The book can help students learn more about electrical machines and can serve as a prescribed text for teaching elective undergraduate courses such as modern permanent magnet electrical machines. Since the book is written in a simple scientific language and without redundant mathematics it can also be used by practicing engineers and managers employed in electrical machinery or electromagnetic device industries. | Modern Permanent Magnet Electric Machines Theory and Control

GBP 99.99
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Permanent Magnet Synchronous Machines and Drives Flux Weakening Advanced Control Techniques

Permanent Magnet Synchronous Machines and Drives Flux Weakening Advanced Control Techniques

Permanent magnet synchronous motors (PMSMs) are popular in the electric vehicle industry due to their high-power density large torque-to-inertia ratio and high reliability. This book presents an improved field-oriented control (FOC) strategy for PMSMs that utilizes optimal proportional-integral (PI) parameters to achieve robust stability faster dynamic response and higher efficiency in the flux-weakening region. The book covers the combined design of a PI current regulator and varying switching frequency pulse-width modulation (PWM) along with an improved linear model predictive control (MPC) strategy. Researchers and graduate students in electrical engineering systems and control and electric vehicles will find this book useful. Features: • Implements evolutionary optimization algorithms to improve PMSM performance. • Provides coverage of PMSM control design in the flux-weakening region. • Proposes a modern method of model predictive control to improve the dynamic performance of interior PMSM. • Studies the dynamic performance of two kinds of PMSMs: surface-mounted and interior permanent magnet types. • Includes several case studies and illustrative examples with MATLAB®. This book is aimed at researchers graduate students and libraries in electrical engineering with specialization in systems and control and electric vehicles. | Permanent Magnet Synchronous Machines and Drives Flux Weakening Advanced Control Techniques

GBP 125.00
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Control Strategies of Permanent Magnet Synchronous Motor Drive for Electric Vehicles

Control Strategies of Permanent Magnet Synchronous Motor Drive for Electric Vehicles

To reduce the emissions of greenhouse gasses and maintain environmental sustainability electric vehicles play a vital role in a modern energy-efficient environment. Permanent magnet synchronous motors (PMSMs) are widely employed in electric vehicle technology due to their high dynamic response better torque-speed characteristics noiseless operation high power density high efficiency and power factor as compared to other conventional motor drives. This book demonstrates the development of various control strategies and illustrates the dynamic performance intensification of a PMSM drive. To ensure the faster dynamic behaviour and flexibility in control under various operating conditions the performance of a PMSM drive has been explained. Finally control strategies have been executed through mathematical modelling and illustration of several case studies for optimal operation. Features: Introduces performance indicators in a self-controlled PMSM machine to justify the dynamic behaviour Discusses comparative performance study and optimization of the drive performance Provides a detailed comparative performance analysis between classical and fuzzy logic controllers in a PMSM drive Includes illustrations and case studies using mathematical modelling and real-time test results Discusses the state of the art in solar-powered energy-efficient PMSM drives with various issues This book is aimed at researchers graduate students and libraries in electrical engineering with specialization in electric vehicles. | Control Strategies of Permanent Magnet Synchronous Motor Drive for Electric Vehicles

GBP 140.00
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Handbook of Research on School Choice

Handbook of Research on School Choice

Updated to reflect the latest developments and increasing scope of school-based options the second edition of the Handbook of Research on School Choice makes readily available the most rigorous and policy-relevant research on K–12 school choice. This comprehensive research handbook begins with scholarly overviews that explore historical political economic legal methodological and international perspectives on school choice. In the following sections experts examine the research and current state of common forms of school choice: charter schools school vouchers and magnet schools. The concluding section brings together perspectives on other key topics such as accountability tax credit scholarships parent decision-making and marginalized students. With empirical perspectives on all aspects of this evolving sphere of education this is a critical resource for researchers faculty and students interested in education policy the politics of education and educational leadership.

GBP 110.00
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Pivotal Lines in Shakespeare and Others Finding the Heart of the Play

Pivotal Lines in Shakespeare and Others Finding the Heart of the Play

Sidney Homan defines a pivotal line as “a moment in the script that serves as a pathway into the larger play … a magnet to which the rest of the play scenes before and after adheres. ” He offers his personal choices of such lines in five plays by Shakespeare and works by Beckett Brecht Pinter Shepard and Stoppard. Drawing on his own experience in the theatre as actor and director and on campus as a teacher and scholar he pairs a Shakespearean play with one by a modern playwright as mirrors for each other. One reviewer calls his approach “ground-breaking. ” Another observes that his “experience with the particular plays he has chosen is invaluable” since it allows us to find “a wedge into such iconic texts. ” Academics and students alike will find this volume particularly useful in aiding their own discovery of a pivotal line or moment in the experience of reading about watching or performing in a play. | Pivotal Lines in Shakespeare and Others Finding the Heart of the Play

GBP 130.00
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