Related Resources: Electrical Design Engineering

Electric Motors, Third Edition

Power Transmission
Electric Motors and Driver Review

Electric Motors, Third Edition

Edwin P. Anderson
Rex Miller

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Open: Electric Motors, Third Edition

In order to obtain a clear concept of the principles on which the electric motor operates, it is necessary first to understand the fundamental laws of magnetism and magnetic induction. It is not necessary to have a great number of expensive laboratory instruments to obtain this knowledge — instead, children's toy magnets, automobile accessories, etc., will suffice. It is from these principles that the necessary knowledge about the behavior of permanent magnets and the magnetic needle can be obtained. In our early schooldays, we learned that the earth is a huge permanent magnet with its north magnetic pole somewhere in the Hudson Bay region and that the compass needle points toward the magnetic pole. The compass is thus an instrument that can give an indication of magnetism. The two spots on the magnet which point one to the north and the other to the south, are called the poles — one is called the north-seeking pole (N) and the other the south-seeking pole (S).

Chapter 1 Motor Magnetic Principles.7 attraction and repulsion—electromagnets—induced currents—direct-current generator—direct-current motor—alternating-current motors—polyphase machines—single¬ phase motors—motor control—summary—review questions

Chapter 2 Synchronous Construction—principle Motors of operation—excitation—speed—torque—power factor—control—application—synchronous-motor trouble chart—summary—review questions

Chapter 3 Squirrel-CageMotors.69 Construction—operating principles—speed—torque—classification—starting—control equipment—application—squirrel-cage motor trouble chart—summary—review questions

Chapter 4 Wound-RotorMotors.101 Characteristics—control equipment—application—wound-rotor motor trouble chart—summary—review questions

Chapter 5 DCMotors.. 119 Construction—operating characteristics—speed control—starting and reversing—controllers—dc - motor trouble chart—summary—review questions

Chapter 6 Fractional-HorsepowerMotors.151 Split-phase induction motors—capacitor-start motors—permanent-capacitor motors—repulsion motors—shaded-pole motors—universal motors—speed control—application—frac¬ tional-horsepower motor trouble chart—summary—review questions

Chapter 7 MagneticContactors.199 Interlocks—shading coils—contactor-coil power supply—arc suppression—shunt contactors—lockout contactors—inductive-type contactors—contactor ratings—maintenance— summary—review questions

Chapter 8 Methods of MotorControl.223 Selection of motor control—motor controller—squirrel-cage motor—enclosures—overcurrent protection—overload protection—manual starter—magnetic control—holding circuit interlock—reversing starter—timers and timing relays—drum switch—control station (push button station)—limit switch—snap switch—pressure switch—float switch—summary— review questions

Chapter 9 MotorTesting.261 Instruments—wiring—machine inspection—lubrication—resistance measurements—motor efficiency—heat-run tests—summary—review questions

Chapter 10 MotorMaintenance.293 Inspection—initial motor starting—determination of belt sizes—belt-drive arrangement— alignment—belt maintenance—direction of rotation—summary—review questions

Chapter 11 Motor Calculations Summary—review questions

Chapter 12 Permanent-magnet, moving-coil meters—dynamometer-type meters—magnetic-vane meters—rectifier-type meters—thermocouple-type meters—hot-wire type meters—meter connections—meter maintenance—summary—review questions

Chapter 13 WiringDiagrams.381 Diagram design—reading diagrams—abbreviations—terminal markings—wiring symbols—summary—review questions

Chapter 14 ArmatureWindings.399 Types of windings—commutator pitch—coil pitch—lead swing—data recording—stripping procedure—summary—review questions

Chapter 15 DC Armature Rewinding Procedure.. 421 Hand winding, coil forming, and slot wedging—identifying the coil leads when winding— machine winding—form winding—coil winding machine—insulating coils—placing arma¬ ture coils in

Chapter 16 Stator and CoilWinding.. 469 Data-taking while stripping, and stripping procedure—rewinding procedure—coil forming— insulating coils—placing coils in slots—connections—testing—summary—review questions

Chapter 17 Insulating andReinsulating.489 Preparation—reinsulating by pressure—impregnation method—summary—review questions

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