Lecture Electromechanical energy conversion include all of the following: Magnetic circuits and magnetic materials, electromechanical energy conversion principles, introduction to rotating machines, synchronous machines, polyphase induction machines, dc machines, variable – reluctance machines and stepping motors, single and two – phase motors, speed and torque control.
Lecture Electromechanical energy conversion: DC Machines presents the following content: Commutator action, effect of armature MMF, analytical fundamentals: Electric – Circuit aspects, analytical fundamentals: magnetic – circuit aspects, analysis of steady – state performance, permanent – magnet DC machines, commutation and interpoles, serial universal motors.
Lecture Electromechanical energy conversion - Magnetic circuits and magnetic materials presents the following content: Introduction to magnetic circuits; flux linkage, inductance, and energy; properties of magnetic materials; AC excitation; permanent magnets; application of permanent magnet materials.
Over the past decade the topic of energy and environment has been acknowledged
among many people as a critical issue to be solved in 21st century since
the Kyoto Protocol came into effect in 1997. Its political recognition was put
forward especially at Heiligendamm in 2007, when the effect of carbon dioxide
emission and its hazard in global climate were discussed and shared universally
as common knowledge.
This chapter presents the following content: Forces and torques in magnetic field systems, energy balance, energy in singly – excited magnetic field systems, determination of magnetic force and torque from energy and coenergy, multiply – excited magnetic field systems, forces and torques in systems with permanent magnets, dynamic equations, analytical techniques.
Electromechanical energy conversion is achievable in a number of ways. These possibilities rely on different fundamental laws of electrical engineering. As the only method that has importance on the large scale is electromechanical conversion achieved by means of electromagnetic converters, this section is fully devoted to the analysis of basic principles involved in electromagnetic electromechanical conversion.
The present edition has been updated in a number of renewable energy
technology areas (Chapter 4 and 5), where progress have been made over the
recent years. New solar simulation studies have been added to Chapter 6,
and market considerations have been included in the overview in Chapter 1,
and in discussing industry liberalisation in Chapter 7. The remarks on
advanced subjects made in the preface to the 2nd edition are still valid. A new
growth area is fuel cells for stationary and mobile uses of hydrogen and
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Efficient thermoelectric energy conversion on quasi-localized electron states in diameter modulated nanowires
The purpose of this book is to provide an up-to-date view of latest research advances in the design of efficient small-scale energy harvesters through contributions of internationally recognized researchers. The book covers the physics of the energy conversion, the elaboration of electroactive materials and their application to the conception of a complete microgenerator, and is organized according to the input energy source.
The rate of energy conversion or transmission (i.e.
power) is related to the physical quantities such as
force, speed, voltage, current, etc.For mechanical system, rate of energy transfer (i.e.,
power) to an object is the product of the force (F in
Newton) and the speed (S in meter/sec) of the point
where the force is applied.Q1. A person pushes an out-of-gas car with a force
of 100 Newton (about 22.5 lb of force) to maintain a
speed of 0.2 m/s. It took him 10 minutes to get to
the nearest gas station. How much energy did this
person use to do this work?...
For energy conversion between electrical and mechanical forms, electromechanical devices are developed. In general, electromechanical energy conversion devices can be divided into three categories: (1) Transducers (for measurement and control) These devices transform the signals of different forms. Examples are microphones, pickups, and speakers. (2) Force producing devices (linear motion devices) These type of devices produce forces mostly for linear motion drives, such as relays, solenoids (linear actuators), and electromagnets.
This chapter include all of the following content: Single-phase induction motors: qualitative examination, starting & running performance of singlephase induction & synchronous motors, revolving-field theory of single-phase induction motors, two-phase induction motors.
This chapter include contents: Introduction to Polyphase Induction Machines, currents and fluxes in Polyphase Induction Machines, induction – motor equivalent circuit, analysis of the equivalent circuit, torque and power by use of Thevenin’s theorem, parameter determination from no – load and blocked – rotor tests, effects of rotor resistance.
This chapter include all of the following content: Elementary concepts, introduction to AC and DC machines, MMF of distributed windings, magnetic fields in Rotating machinery, rotating MMF Waves in AC machines, generated voltage,...
This chapter include all of the following content: Introduction to polyphase synchronous machines, synchronous – machine inductances and equivalent circuits, performance characteristics, effects of salient poles, power – angle characteristics of salient – pole machines, permanent – magnet ac motors.
This book is concerned with the subject of Wind Energy, as a source of clean and renewable and free for
all. The need for this type of book is very well documented, the current consumption of energy is
unsustainable and humans have to change their habits and or utilise this source, but there is so much work
before we can rely completely on renewable energy. This book aims to describe the fundamentals of wind
energy and the pertinent parameters that control the amount of energy available from a given wind turbine.
Coal fuelled the industrial revolution in the 18th and 19th century.
This book covers the recent development and progress of the wind energy conversion system. The chapters are contributed by prominent researchers in the field of wind energy and cover grid integration issues, modern control theories applied in wind energy conversion system, and dynamic and transient stability studies.
In this chapter, we will ﬁnd out how to get the most solar energy out of the sun by considering the time, the altitude angle, the radiation and the photovoltaic (PV) materials. A simple PV model helps to understand the mechanism of energy conversion - solar to electricity. We will further use a simple equivalent circuit to represent a PV cell to investigate its current-voltage characteristics.