Pressure switches – How industrial components work
A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached at its input. The switch can be designed to make contact either when the pressure increases or when the pressure decreases. Pressure switches are commonly used in industry to automatically monitor and control systems that are compressed air controlled.
Another type of pressure switch detects mechanical force; for example, a pressure-sensitive mat is used to automatically open doors in commercial buildings. Such sensors are also used in security alarm applications such as pressure sensitive floors.
More information about pressure switches
Browse all pressure switches in the Unitec catalog
Buy books
Electric Motors and Drives: Fundamentals, Types and Applications
Best-selling reference book on electric motors and drives for non-specialists that closes the gap between mathematics and theory.
Mechanical Design of Electric Motors
Rapid increases in energy consumption and emphasis on environmental protection have posed challenges for the motor industry, as has 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, Electric Motor Mechanical Design provides comprehensive knowledge of modern electric motor design methods and developments. From engine classification, engine component design, modeling, and material and bearing selection to power losses, engine cooling, design integration, vibration, and acoustic noise, this comprehensive textbook covers the fundamentals, practical engineering and design-related issues, modeling and simulation, engineering analysis, manufacturing processes, testing procedures, and performance characteristics of modern electric motors.
With a focus on the mechanical design of modern electric motors, the book covers:
Details on the design and manufacture of major components and subsystems such as rotors, shafts, stators and frames
Review of various cooling methods including forced ventilation, liquid and phase change
Discussion of the analysis and calculation of engine power losses
Dealing with engine vibration and noise issues
Presentation of engineering analysis methods and case studies
Emphasis on design, optimization and applications
With research 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 few decades.
Mechanical Design of Electric Motors
The importance of electric motors is known in various engineering fields. The book provides comprehensive coverage of various types of electric motors including DC motors, three-phase and single-phase asynchronous motors, synchronous motors, general purpose motor, AC servo motor, linear motor and stepper motors. The book covers all details of DC motors including torque equation, back electromotive force, characteristics, starter types, speed control methods and applications.
The book also covers various testing methods of DC motors such as Swinburne's test, brake test, deceleration test, field test and Hopkinson's test. The book also explains three-phase asynchronous motors in detail. It covers rotating field generation, design, operation, slip effect, torque equation, speed ratios, torque characteristics, losses, power flow, equivalent circuit, effect of harmonics on performance, pie chart and applications. This chapter also covers the discussion of induction generators. The book teaches various starting methods and speed control methods of three-phase asynchronous motors. The book contains the explanation of various single-phase asynchronous motors. The chapter on synchronous motors provides a detailed discussion on design, working principle, behavior under load, phasor diagram analysis, Vee and inverted Vee curves, swing, synchronous compensator and applications. The book also teaches various special machines such as single phase commutator motors, universal motor, AC servo motor, linear motor and stepper motors. The book uses simple, clear language to explain each topic. The book provides the logical method to explain various complicated topics and step-by-step methods to facilitate understanding. Each chapter is well supported by 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 looking to refresh your knowledge of engine starting, a temporary beginner to the subject, or an interested person with an hour of free time - this book is the starting point. Steven McFadyen shares his engine starting expertise in a clear, accessible way without time-consuming ramblings or intrusive discussions. Complete with wiring diagrams and thorough explanations of the most common engine starting methods - and challenges - this book is an invaluable reference. It has something to offer for anyone who enjoys learning new things while helping practicing electrical engineers design and implement reliable and functional motor starters.
