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The beginnings of the electric motor are shrouded in mystery, but this much seems clear: The basic principles of electromagnetic induction were discovered in. Practical Electric Motor Handbook Full Lenght Film In Hd - Hq - Dvd - Divx - Ipod - Pda Romanian: An Essential Grammar (Essential Grammars) Pdf Download. 2 Practical Electric Motor Handbook. Fig. One of the earliest indications of motor action. To the alert mind, primitive experiments can reveal the possibility of .
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Institutional Subscription. Free Shipping Free global shipping No minimum order. Practical approach with minimum theory Covers a core area ignored by many electronics texts Shows how to incorporate motors into electronic products. English Copyright: Powered by. You are connected as. Connect with: Use your name: Inside the stator, there's the coil, mounted on an axle that spins around at high speed—and this is called the rotor.
The rotor also includes the commutator. Universal motors DC motors like this are great for battery-powered toys things like model trains, radio-controlled cars, or electric shavers , but you don't find them in many household appliances. Small appliances things like coffee grinders or electric food blenders tend to use what are called universal motors, which can be powered by either AC or DC.
Unlike a simple DC motor, a universal motor has an electromagnet, instead of a permanent magnet, and it takes its power from the DC or AC power you feed in: When you feed in DC, the electromagnet works like a conventional permanent magnet and produces a magnetic field that's always pointing in the same direction. The commutator reverses the coil current every time the coil flips over, just like in a simple DC motor, so the coil always spins in the same direction.
When you feed in AC, however, the current flowing through the electromagnet and the current flowing through the coil both reverse, exactly in step, so the force on the coil is always in the same direction and the motor always spins either clockwise or counter-clockwise.
What about the commutator? The frequency of the current changes much faster than the motor rotates and, because the field and the current are always in step, it doesn't actually matter what position the commutator is in at any given moment.
Animation: How a universal motor works: The electricity supply powers both the magnetic field and the rotating coil. With a DC supply, a universal motor works just like a conventional DC one, as above.
With an AC supply, both the magnetic field and coil current change direction every time the supply current reverses. That means the force on the coil is always pointing the same way. Photo: Inside a typical universal motor: The main parts inside a medium-sized motor from a coffee grinder, which can run on either DC or AC. The gray electromagnet round the edge is the stator static part and its powered by the orange-colored coils. Note also the slits in the commutator and the carbon brushes pushing against it, which provide power to the rotor rotating part.
Induction motors in such things as electric railroad trains are many times bigger and more powerful than this, and always work using high-voltage alternating current AC , instead of low-voltage direct current DC , or the moderately low voltage household AC that powers universal motors. Other kinds of electric motors In simple DC and universal motors, the rotor spins inside the stator. The rotor is a coil connected to the electric power supply and the stator is a permanent magnet or electromagnet.
Large AC motors used in things like factory machines work in a slightly different way: they pass alternating current through opposing pairs of magnets to create a rotating magnetic field, which "induces" creates a magnetic field in the motor's rotor, causing it to spin around. You can read more about this in our article on AC induction motors.
Without her tireless effort this work would not have been completed. He has been with the company since and performs unbalance analysis on rotating assemblies for manufacturers worldwide.
He holds a BS degree in electrical engineering technology and has over 20 years experience, with the past 8 focused on the electric motor industry. JOHN S. BANK Sec. He is also a Certified Public Accountant in the state of Illinois and a licensed real estate broker in the state of Illinois He directed sales and marketing at Link Engineering Company from to Since , he has been vice president for motor products of Link Engineering Company.
He conducted postdoctoral research in the field of superconducting oxides at Princeton University, Princeton, New Jersey, in He was an assistant professor of chemistry at Lycoming College, Williamsport, Pennsylvania, from to He has seven years of experience in magnetic materials research.
He is a member of ASM. He has worked in research for Magnets International, Inc. His career at Oven Systems, Inc. For the past three years, he has managed the electric motor equipment division.
In to he was appointed as visiting professor at Lakehead University, Canada, and in the following year he received an MSc from Coventry University, England.
After joining Vector Fields Ltd. He was appointed to the position of vice president of Vector Fields, Inc. In the past two years, he has conducted several design seminars at original equipment manufacturers focusing on this topic.
He was vice president of Marketing for Oberg Industries and had previous experience in plant management and strategic planning.
He received a BS in electrical engineering from the University of Pittsburgh in Since February of , he has been a senior development engineer with Cutler-Hammer, Milwaukee, Wisconsin, responsible for the design and application of magnetic motor control.
He is a Registered Professional Engineer in the state of Pennsylvania. He has eight patents in the area of motor control. He is a member of IEEE. He has been employed by the Hoeganaes Corporation for 22 of the last 25 years.
During that time, he has held numerous positions in the sales and marketing and research and development departments. His current position is manager of electromagnetics and customer applications in the research and development department, with responsibilities for customer service and product development. He is the author of numerous articles on motors and motion control.
In , he joined the Square D Company in Milwaukee, where he was responsible for the design of industrial lifting magnets and their applications. In , he transferred to the Square D Controls Division, where he was responsible for contactor development.
His current position is principal engineer. He also attended the University of Loyola for business administration. He received honors from the Tau Betta Pi educational honor society and the Etta Kappa Nu engineering honor society for academic achievement. He has 38 years experience in the motor business. He founded Incremotion Associates in and has previously worked for such companies as Vernitron, Printed Motors, Inc. His research interests are discrete event simulation, resource protection in architecture, operating systems, system Programming Languages, and the history of computing.
MARK A. JUDS Secs. He also has expertise in heat transfer and mechanical dynamics. JUDD Secs.
He spent 30 years in principal research positions for U. Steel and Ispat-Inland.
For three years he served as director of research and development for Johnstown Corporation, a large ferrous foundry and fabrication firm.
He has also taught general metallurgy at Carnegie-Mellon University. He is also the treasurer and organizing committee member of the annual Conference on the Properties and Application of Magnetic Materials.
He holds patents in the powder metallurgy and soft magnetic material fields. Recently he has returned home to start his own consulting firm in Madras, India. His interests are in the areas of power electronics and control of switchedreluctance motors.
He holds four patents for magnet wire and cable products and equipment. TODD L. KING Sec. He joined Borg Warner Corporate Research Center, Des Plaines, Illinois, in , where he worked in analysis of motors and actuators and the design of automotive controls, actuators, and sensors. He joined Eaton Corporate Research and Development Center, Milwaukee, Wisconsin, in as a senior engineer specialist, where he worked in the design of actuators for appliance, automotive, aerospace, hydraulic, and truck products.
He also worked in the design and analysis of commercial and industrial motor controls. He became the engineering manager for the Design Analysis Technology Group in and added systems technology in the Eaton Innovation Center, where he has responsibility for defining the strategic direction of systems technology for the corporation. He received his BS and MS degrees in metallurgical engineering from the University of Minnesota, Minneapolis, in and , respectively.
He has 30 years experience in process and product research. He has worked in research at Magnetics International, Inc.