The tutorial is of interest to any student studying control systems and in particular the ec module d227 control system engineering. An electric motor will try to deliver the required power even at the risk of selfde struction. An electric motor is a device converting electrical energy into mechanical energy usually a torque. 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, costeffective, energysaving, quiet, precisely controlled, and longlasting electric motors.
When developing a new electric or hybrid electric vehicle, engineers must weigh a variety of design tradeoffs and considerations when selecting electric motors generators. Understanding motor nameplate information nema vs iec. Motor development for electrical drive systems 73 rotor imbalance rotor mass centre of gravity not located on the rotational axis dislocated by a displacement e s. And international journal of mechanical and production engineering, issn. Permanentmagnet motors monographs in electrical and electronic engineering mechanical design of electric motors kjeldsbergs body fluid analysis industrial fluid power, vol. From motor classification, design of motor components, model setup, and material and bearing selections to power losses, motor cooling, design integration, vibration, and acoustic noise, this. An ac motor of this type may be part of a pump or fan or. Therefore, an electric motor must be protected from selfdestruction. He has 20 years of consulting experience with dupont. Optimize your vehicle by cooling electric motors and generators. Two types of electric motors are used in electric vehicles to provide power to the wheels. Their bearings can handle heavier radial and axial loads, and their physical construction is more. Electric motors whether designing an electric motor for an electric vehicle that needs to be small, efficient and quiet, or for an industrial application where size and sound are not of major concern, it is critical to simulate electric motors early in the design process. Device references the reverse task, that of converting mechanical motion into electrical energy, is accomplished by a generator or dynamo.
Download mechanical design of electric motors by wei tong easily in pdf format for free. Jul 11, 2019 it runs governing the principal of emf induction due to varying flux density. Electric motors for machines and mechanisms mits fab lab. Apply to design engineer, mechanical designer, application developer and more. The alternating current ac electric induction motor has been an industry workhorse for electromechanical conversion for over 100 years.
Practical electric motor handbook pdf boiler and mechanical. A variety of ways to predict the motor constant, which relates torque to current and speed to voltage, are presented. Optimize your vehicle by cooling electric motors and. Lecture 34 electric machine cooling strategies lecture 35 mechanical design issues for electrical machines lecture 36 manufacturing practices of electrical machines. Combining the best available materials with superior technology, the electric motors. On completion of this tutorial, you should be able to do the following. The types of ac motors mainly include synchronous, asynchronous, induction motor. The core principle underlying motors is electromagnetic induction. Farley, aaron, design and implementation of a small electric motor dynamometer for mechanical engineering undergraduate laboratory 2012. Jun 27, 2017 what will mechanical engineers do after automobiles become mostly electric and electronic. Their design implements the common idea interaction of the magnetic fields with permanent magnets, ferromagnetics and electric currents carrying conductors to produce the mechanical forces and torques.
Two 500w hub motors are implemented in a directdrive electric scooter. This book, therefore, targets the large body of workers engineers and students reasonably versed in engineering concepts who feel the need for practical insights relating to electric motors. Rapid increases in energy consumption and emphasis. The alternating current ac electric induction motor has been an industry workhorse for electro mechanical conversion for over 100 years. Ac motors are used worldwide in many applications to transform electrical energy into mechanical energy. The working of the synchronous motor mainly depends on the 3phase supply. This reading is a very brief introduction to four most basic types of electric motors.
Note that in this study, 4 motors were needed, mounted onto the vehicle wheels to provide the required power. Determining electric motor load and efficiency most likely your operations motors account for a large part of your monthly electric bill. Feb 27, 2018 i am a mechanical engineering graduate student working on hybrid electric vehicle energy management strategies. Pdf electrical and mechanical design of a pm traction motor with. What will mechanical engineers do after automobiles become mostly electric and electronic. Electric motors can be powered by direct current dc sources, such as from batteries, motor vehicles. An introduction to electric motors stmicroelectronics. Mechanical design of electric motors crc press book 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, costeffective, energysaving, quiet, precisely controlled, and longlasting electric motors. The design of an afpm motor appropriate for an electric vehicle should consider both requirements and limits. Design and prototyping methods for brushless motors and.
How intensively the electric circuit is used the type of enclosure type of cooling the duty cycle of the load the frequency of starting and stopping s 34. This mechanical design of electric motors by wei tong book is available in pdf formate. The all electric vehicle lost because of the lack of range from current battery technology. Purpose of an electric motor an electric motor is a device for converting electrical power into mechanical power. We not only talk about different type of motors but we also see how different motors work under different conditions. Motors electric motors, both ac and dc types, come in many shapes and sizes.
The stator in the electric motor generates the field current which rotates in a stable speed based on the ac frequency. Behaviour with a mechanical load 35 relative magnitudes of v and e, and efficiency 37 analysis of primitive motor conclusions 38. Design and prototyping methods for brushless motors and motor. Downlod free this book, learn from this free book and enhance your skills. An engineering guide to ac and dc motor designs and operation. Electric motors convert electrical energy into mechanical energy. Electrical motor types classification and history of motor. Different types of electric motors and their applications. Everyday low prices and free delivery on eligible orders.
Moreover, we also discuss about various factors that affect working of these motors and reliable ways to improve. Magnetism and induction a motor converts electrical energy into mechanical energy ac alternating current reverses poles of electromagnetic coil 120 times per sec 60hz. So d2ln volume x speed s11k w b g ac get s from shaft output power hp or kw, efficiency and power factor. Small electric motors are also inherently less e cient more like 50%. This article will serve as a comprehensive guide for articles related to ac and dc motors. Mechanical design of electric motors 1st edition wei tong. Rather than motor design, their chief concerns lie with the selection, system installation, operation and performance evaluation of. As in any electrical machine it is possible to design a d. Instrumentation and control tutorial 2 electric actuators this is a stand alone tutorial on electric motors and actuators. An electric motor converts electrical energy into mechanical motion. The product or represents the real permeability of the material, and is thus the analog of electrical conductivity. I am a mechanical engineering graduate student working on hybrid electric vehicle energy management strategies. This conversion is usually obtained through the generation of a magnetic field by means of a current flowing into one or more coils. Who designs the electric motors in electric and hybrid.
Mechanical design of electric motors pdf book library. The all electric vehicle lost because of the lack of. During the infancy of the automobile, electric and gasoline vehicles competed for dominance of the market. Electric motor design mechanical engineer jobs, employment. When developing a new electric or hybrid electric vehicle, engineers must weigh a variety of design tradeoffs and considerations when selecting electric motorsgenerators. Some are standardized versions for generalpurpose applications. Far too often motors are mismatchedor oversizedfor the load they are intended to serve, or have been rewound multiple times. Structural design optimization of electric motors to improve torque performance by jaewook lee a dissertation submitted in partial fulfillment of the requirements for the degree of doctor of philosophy mechanical engineering in the university of michigan 2010 doctoral committee. It provides mechanical engineers and students inof energy conversion industries with comprehensive design techniques and practical approaches in the design of electric motors. Mechanical design of electric motors by wei tong engineering. By amperes law, the current induces a magnetic eld, which can interact with another magnetic eld to produce. Who designs the electric motors in electric and hybrid cars. Buy mechanical design of electric motors 1 by tong, wei isbn. Mechanical design of electric motors 1st edition wei.
Electric circuit analogy 10 the airgap 11 reluctance and airgap flux densities 12. Some of the motors parameters and characteristics cannot vary much,the. Focusing on the mechanical design of modern electric motors, the book. This tutorial will introduce the user to the fundamental electrical and mechanical principles of ac electric induction motor design and application. Practical electric motor handbook pdf by irving m gottlieb. From my experience electrical machine design is a field in itself and elements from electromagnetic theory, field theory, tribology, st. An electric motor is an electrical machine that converts electrical energy into mechanical energy. It provides mechanical engineers and students in of energy conversion industries with comprehensive design techniques and practical approaches in the design of electric motors.
Single phase induction motor like a 3 phase, runs by the principal of emf induction due to flux, but the only difference is, it runs on single phase supply and its starting methods are governed by two wellestablished theories, namely the double revolving field theory and the. Electric motor design software electric motors are devices for conversion of the electrical energy into mechanical energy. Professor noboru kikuchi, chair professor kamal sarabandi. His specialty is the design, operation, and maintenance of electric power distribution systems and large motor installations.
Gms new electric drive module in the 2014 spark ev features a gmdesignedandmanufactured 120 kw permanent magnet traction motor visible on the left side and smart use of key carryover components from volt and the twomode hybrid transmission. Most electric motors operate through the interaction between the motor s magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor s shaft. Motor nameplate informationthe service factor on a motor nameplate indicates how much above the nameplate rating a motor can be continuously loaded. Mechanical design of electric motors wei tong 2014, pdf. What will mechanical engineers do after most cars go electric. Ac and dc motor designs and operations are explained in this article. There are many types of ac motors, but this course focuses on threephase induction motors, the most common type of motor used in industrial applications. Electric motors are essentially inverse generators. Download online pdf mechanical design of electric motors, read pdf mechanical design of electric motors, download full pdf mechanical. Mechanical design of electric motors crc press book. The third case study, a 10kw axial flux motor, is used to demonstrate the flexibility of the design methods. An ac motor of this type may be part of a pump or fan or connected to some other form of mechanical equipment such as a winder, conveyor, or mixer. Dl tesla average magnetic flux density over airgap surface ac 32t phi ph. B g specific magnetic loading ac specific electric loading select b g from experience limited by losses in the teeth and magnetizing current.
Abb offers a comprehensive range of reliable and high efficiency motors and generators for all applications. Mechanical energy what is an electric motor an electric motor is a device converting electrical energy into mechanical energy usually a torque. Design and implementation of a small electric motor. 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 indepth knowledge of stateoftheart design methods and developments of electric motors. An illustrated guide cooking under pressure the ultimate electric pressure recipe cookbook and guide for electric. Mechanical design of electric motors offers research results based on the personal experience of the author as well as significant research contribution of others. Abb has what it takes to help every industry and application reach new levels of efficiency and energy savings even under the most demanding conditions. Electric motor design software quickfield fea software. Motor design and, even more importantly, motor choice and use practices are an important area of potential energy conservation. Introduce electric motor technology and its role in.
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