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Book Del Toro, V. In this book an analysis of a-c and d-c electric machines is presented. All aspects of machine theory and applications are covered including electronic control of a-c and d-c motors as well as the novel stepper motors.
Also included are topics such as the parallel operation of synchronous generators, transient and subtransient reactances, and the dynamical behavior of the prime mover synchronous generator coupled system in preparation for the study of power systems. Suitable parameters for unbalanced operation are described and the text concludes with an extensive exposition of fault calculations protective relaying. The main components of electric power systems are discussed. The book not only covers all the basic fundamentals, but updates obsolete treatments and presents comprehensive coverage of important developments in electric power engineering.
The uses of synchronous machines, induction machines, and other components utilized in current electric power systems are described in detail. The logic behind every system component is fully explained with special emphasis on the significant changes brought about by the ascendancy of electronic controls.
The entire spectrum of electric power machinery - whether synchronous or asynchronous, single-phase or polyphase, AC or DC is covered. Introductory material clarifies the purpose of the devices described and the laws of nature on which their operation is based. Many illustrative examples are features, and a total of practice problems promote thorough assimilation of the material presented.
It has been shown analytically and experimentally that such designs can achieve very wide constant-power speed ratios CPSR [1,2]. This work has shown that machines of this type are capable of achieving very low cogging torque amplitudes as well as significantly increasing the machine power density  compared to SPM machines using conventional distributed windings. Considerable attention has traditionally been devoted to maximizing the full-load efficiency of traction machines at their rated operating points and along their maximum-power vs.
For example, on-line control approaches have been presented for maximizing the full-load efficiency of PM synchronous machines, including the use of negative d-axis stator current to reduce the core losses [11,12]. Partial-load efficiency is particularly important if the target traction application requires long periods of cruising operation at light loads that are significantly lower than the maximum drive capabilities.
While the design of the machine itself is clearly important, investigation has shown that this is a case where the choice of the control algorithm plays a critical role in determining the maximum partial-load efficiency that the machine actually achieves in the traction drive system. There is no evidence that this important topic has been addressed for this type of SPM machine by any other authors. This topic takes on even greater significance for fractional-slot concentrated-winding SPM machine designs.
The resulting high electrical frequencies can easily result in high stator core losses unless special care is taken during the machine design process. For purposes of this discussion, a 55 kW peak SPM machine designed to meet requirements established in the US FreedomCar program  is used as the basis for demonstrating the proposed technique.
A combination of closed-form analysis  and finite element analysis FEA is used during this investigation.
electric energy system theory. an introduction (olle i. elgerd).pdf
ELECTRIC ENERGY SYSTEMS THEORY ELGERD PDF