Valves – Troubleshooting and Repair
A control valve is a valve used to control the flow of fluid by varying the size of the flow path as indicated by a signal from a controller
This allows direct control of flow rate and consequent control of process quantities such as pressure, temperature and liquid level.
In automatic control terminology, a control valve is called a “final control element.”
More information about valves
Inquiry about valves and spare parts at Unitec:
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Electric Motors and Drives: Fundamentals, Types and Applications
Best-selling reference on electric motors and drives for non-specialists, bridging the gap between mathematics and theory.
Mechanical Design of Electric Motors
Rapid increases in energy consumption and emphasis on environmental protection have presented challenges to the motor industry, as well as the design and manufacture of highly efficient, reliable, cost-effective, energy efficient, quiet, precisely controlled and durable electric motors.
Suitable for motor designers, engineers, manufacturers, as well as maintenance personnel, undergraduate and graduate students, and academic researchers, Mechanical Design of Electric Motors provides in-depth knowledge of state-of-the-art design methods and developments of electric motors. From motor classification, motor component design, model configuration, material and bearing selection to power losses, motor cooling, design integration, vibration and acoustic noise, this comprehensive text covers the fundamentals, practical design and issues related to the design, modeling and simulation, engineering analysis, manufacturing processes, test procedures and performance characteristics of today's electric motors.
Focusing on the mechanical design of modern electric motors, the book:
Details the design and manufacturing of major components and subsystems, such as rotors, shafts, stators, and frames
Reviews various cooling techniques, including forced air, liquid, and phase change
Analyzes the analysis and calculation of engine power losses
Addresses engine vibration and acoustic noise issues
Presents engineering analysis methods and case study results
Emphasizes construction, optimization and applications
With research results from the author's own experience and significant contributions from others, Mechanical Design of Electric Motors highlights innovative and advanced electric motors developed over the past decades.
Mechanical Design of Electric Motors
The importance of electric motors is well known in various fields of engineering. The book provides complete coverage of the various types of electric motors including direct current motors, three-phase and single-phase induction motors, synchronous motors, universal motor, alternating current servo motor, linear induction motor and stepper motors. The book covers all the details of DC motors including torque equation, back emf, characteristics, types of starters, speed control methods and applications.
The book also covers the various testing methods of DC motors such as Swinburne test, brake test, delay test, field test and Hopkinson test. The book also explains three-phase induction motors in detail. It includes the production of rotating magnetic field, construction, operation, slip effect, torque equation, torque relations, torque-slip characteristics, losses, power flow, equivalent circuit, effect of harmonics on performance, circular diagram and applications. This chapter also includes discussion of the induction generator. The book teaches the various starting methods and speed control methods of three-phase induction motors. The book incorporates the explanation of various single-phase induction motors. The chapter on Synchronous Motor provides a detailed discussion of construction, working principle, behavior under load, phasor diagram analysis, Vee and Inverted Vee curves, hunting, synchronous condenser and applications. The book also teaches the various special machines such as single phase commutator motor, universal motor, AC servo motor, linear induction motor and stepper motors. The book uses clear and lucid language to explain each topic. The book provides the logical method of explaining the various complicated topics and step by step methods to facilitate understanding. Each chapter is well supported with necessary illustrations, self-explanatory diagrams and a variety of solved problems. The book explains the philosophy of the subject, which makes the understanding of the concepts very clear and makes the subject more interesting.
Motor Starting and Control Primer: An introduction to the starting techniques and control of electric motors
Whether you are a busy electrical engineer who needs to brush up on motor starting, a student new to the subject short on time, or an interested person with an hour to spare, this book is where to start. Steven McFadyen shares his expert engine starting knowledge in a clear, easily accessible manner without time-consuming verbiage or self-aggrandizing discussions. Complete with circuit diagrams and thorough explanations of the most common and challenging engine starting methods, this book is an invaluable reference. It has something to offer anyone enthusiastic about learning new things, while at the same time helping practicing electrical engineers design and implement reliable and functional motor starters.
