Pressure switches – How industrial components work
A pressure switch is a type of switch that actuates an electrical contact when a certain fluid pressure set at its inlet has been reached. The switch may be designed to make contact either in the event of a pressure rise or a pressure drop. Pressure switches are widely used in industry to automatically monitor and control systems that use pressurized fluids.
Another type of pressure switch detects mechanical force; For example, a pressure-sensitive mat is used to automatically open doors in commercial buildings. These sensors are also used in security alarm applications such as pressure sensitive floors.
For more information on pressure switches
Pressure switches on Wikipedia
Explore all pressure switches in the Unitec catalog
Buying books
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 posed challenges to the motor industry, as well as the design and manufacture of highly efficient, reliable, cost-effective, energy-saving, quiet, precisely controlled and long-lasting electric motors.
Suitable for motor designers, engineers and 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, and 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 calculation and evaluation 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 personal 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, electromotive counterforce, 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, deceleration 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 ratios, torque-slip characteristics, losses, power flow, equivalent circuit, effect of harmonics on performance, circle 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, V and inverted V curves, hunting, synchronous condenser and applications. The book also teaches various special machines such as single-phase commutator motors, universal motors, AC servo motors, linear induction motors 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 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 manual: an introduction to electric motor starting and control techniques
Whether you are a busy electrical engineer who needs to refresh your knowledge of motor starting, a student new to the subject short on time, or an interested person with a spare hour, this book is the place to start. Steven McFadyen shares his expert engine starting knowledge in a clear, easy-to-access manner without time-consuming verbiage or self-referential discussions. Complete with circuit diagrams and thorough explanations of the most common engine starting methods as well as challenges, this book is an invaluable reference. It has something to offer anyone who wants to learn new things, while at the same time helping practicing electrical engineers design and implement reliable and functional motor starters.
