Pressure switches – How industrial components work
A pressure switch is a type of switch that activates an electrical contact when a certain fluid pressure set at its inlet is reached. The switch can be designed to close the contact on both an increase and decrease in pressure. Pressure switches are widely used in industry to automatically supervise 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. Such sensors are also used in security alarm applications such as pressure sensitive floors.
For further information on pressure switches
Pressure switches on Wikipedia
Consult all the pressure switches in the Unitec catalog
Buy books
Electric Motors and Drives: Fundamentals, Types and Applications
Bestselling reference manual 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 has the design and manufacturing of highly efficient, reliable, cost-effective, energy-efficient, quiet, precisely controlled and durable 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 modern electric motor design methods and developments. From engine classification, engine component design, model configuration, material and bearing selection, power losses, engine cooling, design integration, vibration and acoustic noise, this text comprehensive 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
Examines various cooling techniques, including forced air, liquid, and phase change
Discusses 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 findings from the author's personal experience and significant contributions from others, Mechanical Design of Electric Motors highlights the innovative and advanced electric motors developed in recent decades.
Mechanical Design of Electric Motors
The importance of electric motors is well known in various fields of engineering. The book provides comprehensive coverage of various types of electric motors, including DC motors, three-phase and single-phase induction motors, synchronous motors, universal motor, AC servo motor, linear induction motor, and stepper motors. The book covers all the details of DC motors, including torque equation, counter emf, characteristics, types of starters, speed control methods and applications.
The book also covers the various testing methods of DC motors, such as the Swinburne test, brake test, delay test, field test and Hopkinson test. The book also explains three-phase induction motors in detail. Includes rotating magnetic field production, construction, operation, effect of slip, torque equation, torque ratios, 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 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, load behavior, phasor diagram analysis, V-curves and inverted-V curves, hunting, synchronous capacitor and applications. The book also teaches about various special machines such as single-phase commutator motor, universal motor, AC servo motor, linear induction motor and stepper motors. The book uses simple and lucid language to explain each topic. The book provides the logical method to explain various complicated topics and methods gradually 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 topic which makes the understanding of the concepts very clear and makes the topic 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 refresh your memory about starting motors, a busy student new to the subject, or an interested person with an hour to spare, this book is the place to start. Steven McFadyen shares his expert engine starting expertise in a clear and easily accessible way, without long, time-consuming discussions or self-promotional conversations. Complete with circuit diagrams and in-depth explanations of the most common motor starting methods and related problems, this book is an invaluable reference. It has something to offer anyone who wants to learn new things, while at the same time assisting practicing electrical engineers to design and implement reliable and functional motor starters.
