HANDBOOK OF ELECTRIC MOTORS PDF
for non-specialist users and students of electric motors and drives. My original aim was the more prosaic 'handbooks', which are full of useful detail but provide. HANDBOOK OF SMALL ELECTRIC MOTORS William H. Yeadon, P.E. Editor in Chief Alan W. Yeadon, P.E. Associate Editor Yeadon Energy Systems, Inc. Purchase Electric Motor Handbook - 1st Edition. Print Book & E-Book. ISBN ,
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Handbook of Electric Motors, 2nd Ed. [Book Review]. Article (PDF Available) in IEEE Electrical Insulation Magazine 21(3) 59 · June Presenting current issues in electric motor design, installation, application, and Handbook of Electric Motors DownloadPDF MB. Electric Motor Handbook. by: James L. Kirtley, Jr., H. Wayne Beaty, Nirmal K Ghai , Steven B Leeb, Richard H. Lyon. Abstract: From portable CD drivers to heavy.
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.
Electric Motor Handbook
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.
Handbook of Electric Motors
He has 31 years experience in metallurgy and magnetic materials. Steel Corporation, Monroeville, Pennsylvania, from to In addition, he has 17 years of experience in spectral analysis of sound, vibration, and current on these motor types and on ball bearings as received, as well as in failure analysis of field problems.
As a senior project engineer and registered Professional Engineer, he currently has responsibility for an engineering development, analysis, and test group for ac and dc products at Electro-Craft Motion Control, Gallipolis, Ohio a Rockwell Automation business.
He has 25 years experience in the area of magnetic applications.
In his present position he is responsible for reviewing customer requirements for the magnetizing, demagnetizing, and measuring of permanent magnets and magnet assemblies and for proposing the appropriate equipment and complete systems. He has worked in sales of servo electric motors at Moog, Inc.
He is currently the vice president of Oven Systems, Inc. He has several years of experience in software design and three years of experience in the motor design industry.
He currently holds the position of magnetic measurement specialist at LDJ Electronics. EARL F. He received his PhD from the University of Missouri. He has 16 years of field experience in motor design and over 36 years of experience in the instruction of motor technology. His professional emphasis is on electromechanical, power, and control systems. He currently instructs graduate-level engineering courses and is frequently sought as an industrial and legal consultant.
He received his MSME degree in He has developed and tested analog and digital electromechanical and hydraulic servosystems for the military and commercial interests. Since joining Renco in , he has been involved with the design and manufacture of incremental rotary optical encoders for the industrial and office automation industries.
KARL H. He has 25 years experience in manufacturing and management with such companies as General Signal, General Electric, Emerson Electric, Clark Equipment, Chrysler, and Cincinnati Milacron, and his own consulting firm. He is a licensed Professional Engineer in the state of California, in the field of control.
He has been a senior engineer; chief scientist with Synektron Corporation, a manufacturer of brushless dc motors; and a professor at California Polytechnic Institute. He worked as an independent consultant in the fields of magnetics and electromagnetics for 10 years, and included the U.
The magnetic force between two moving charges as given in Eq. This vector function, termed the magnetic flux density produced by a single moving charge, is thus defined as: 1. The portion of the space in which moving charge experiences a magnetic force described by Eq. If there are several charges moving with respect to the observer with velocities much smaller than the speed of light, the total force on any charge may be obtained by vectorially adding forces exerted on it by each charge individually; that is, by using the principle of superposition of magnetic forces.
For the several moving charges q1, q2,…, Chapter 1 3 Figure 1. Figure 1. The force on the elemental volume can then be written as: 1. Taking the elemental volume as a small length of the conductor in Fig.
To help visualize the magnetic field, magnetic flux lines and magnetic flux tubes are used. A magnetic flux line is drawn tangential to at all points. A magnetic flux tube is tubular surface formed by magnetic flux lines.
Electric Motor Repair Text and Appendix
Because by this definition is tangential to the surface of a magnetic flux tube, the magnetic flux in any cross section along the length of a tube is constant. It is customary to draw magentic flux lines representing tubes of equal flux; the density of the flux lines is then a measure of the magnitude of the flux density vector. These are a field approach, which attempts to solve for the electromagnetic field in and around the device, and a circuit approach, which considers different devices to be a system of magnetically coupled currentcarrying coils.
An attempt is made here to develop the basic concepts that will be useful to both these approaches. For any current loop placed in a steady magnetic field, as shown in Fig. The parallel component however, will produce forces that create a torque on the loop, tending to turn the loop so that the magnetic field generated by the current loop will coincide with the direction of The torque on the loop is given by: 1. The product I is usually called the magnetic moment of the loop, and then: 1.
From a macroscopic point of view, and on the basis of the crude atomic model described earlier, electrons moving in circular orbits around the nucleus may be considered as tiny current loops.
A magnetic moment can be associated with each atom because of the current loops represented by the moving electrons.
In the absence of an external magnetic field, the magnetic moment vectors associated with individual atoms are randomly oriented in space, and consequently result in a net zero magnetic field at a macroscopic level. When placed in an external magnetic field, each atom experiences a torque that tends to align the individual moments in the direction of the field.
Because of the intra-atomic and interatomic forces and dynamics, the individual moments of atoms within the material do not all orient themselves with the external magnetic field. The net magnetic field generated by this realignment within the material is denoted as For most substances, the magnetization is given by: 1. The magnetic field intensity is defined as: 1.
For most practical applications, the relative permeability of these materials is considered to be equal to unity. Some materials such as iron, cobalt, nickel, and others exhibit and these materials are known as ferromagnetic.
This is magnetic saturation. Also, the B-H relationship depends on the magnetic history of the material; that is, for a given value of H, the resulting B depends on how the material is magnetized. This is hysteresis. These properties can be illustrated with the help of Fig.
Table of Contents
Now if H is reduced to —Hm, the B—H relationship traces a different curve, such as 1—2—3—4. At point 2, H is zero but B has a finite value Br, referred to as the residual flux density. H has to be reversed to a value —Hc, called the coercive field intensity, to bring the flux density B to zero at point 3. If the magnetization cycles are repeated several times, the B—H relationship will stabilize and trace a closed curve known as the hysteresis loop.
The locus of the tip of the hysteresis loop is called the normal magnetization curve. At high values of H, the relative permeability is reduced to unity, and the material is said to be magnetically saturated. In saturation, all the individual magnetic moment vectors representing the atoms are totally aligned with the external field.
When a magnetic material is subjected to alternating field intensity, the B—H relationship traces the hysteresis loop once every cycle of field intensity variation.
The magnetic moment vectors are continually moving, trying to orient themselves along the external field. These atomic movements are accompanied by friction, and a certain amount of energy is lost as heat in the material during each magnetization cycle. This lost energy is the hysteresis loss, and the loss per unit volume of material per magnetization cycle is proportional to the area of the hysteresis loop.
In the kind of small, battery-powered motors we use around the home, a better solution is to add a component called a commutator to the ends of the coil. Don't worry about the meaningless technical name: this slightly old-fashioned word "commutation" is a bit like the word "commute".
It simply means to change back and forth in the same way that commute means to travel back and forth. In its simplest form, the commutator is a metal ring divided into two separate halves and its job is to reverse the electric current in the coil each time the coil rotates through half a turn.
One end of the coil is attached to each half of the commutator. The electric current from the battery connects to the motor's electric terminals. With the commutator in place, when electricity flows through the circuit, the coil will rotate continually in the same direction. Artwork: A simplified diagram of the parts in an electric motor. Animation: How it works in practice.
Note how the commutator reverses the current each time the coil turns halfway.
This means the force on each side of the coil is always pushing in the same direction, which keeps the coil rotating clockwise. A simple, experimental motor such as this isn't capable of making much power.
We can increase the turning force or torque that the motor can create in three ways: either we can have a more powerful permanent magnet, or we can increase the electric current flowing through the wire, or we can make the coil so it has many "turns" loops of very thin wire instead of one "turn" of thick wire.
In practice, a motor also has the permanent magnet curved in a circular shape so it almost touches the coil of wire that rotates inside it. The closer together the magnet and the coil, the greater the force the motor can produce.
Although we've described a number of different parts, you can think of a motor as having just two essential components: There's a permanent magnet or magnets around the edge of the motor case that remains static, so it's called the stator of a motor.
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.Lloyd W.
Included among them are Dr. The closer together the magnet and the coil, the greater the force the motor can produce. Because of the intra-atomic and interatomic forces and dynamics, the individual moments of atoms within the material do not all orient themselves with the external magnetic field. Ben Kuo, Dr. He worked as an independent consultant in the fields of magnetics and electromagnetics for 10 years, and included the U.
The parallel component however, will produce forces that create a torque on the loop, tending to turn the loop so that the magnetic field generated by the current loop will coincide with the direction of The torque on the loop is given by: 1.
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.
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