By Ali Emadi

ISBN-10: 0824757351

ISBN-13: 9780824757359

This distinctive reference presents directions for the choice and usage of electrical cars for stronger reliability, functionality, energy-efficiency, and life-cycle price. thoroughly revised and multiplied, the e-book displays the new country of the sphere, in addition to fresh advancements up to the mark electronics, the economics of energy-efficient cars and platforms, and complex energy digital drivers. It contains 5 new chapters overlaying key issues equivalent to the basics of strength electronics appropriate to electrical motor drives, adjustable velocity drives and their functions, complicated switched reluctance motor drives, and everlasting magnet and brushless DC motor drives.

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Example text

These improvements in efficiency, or loss reductions, are generally achieved by increasing the amount of active material used in the motors and by the use of lower-loss magnetic steel. 6 shows this comparison of a standard motor and an energy-efficient motor for a particular horsepower rating. 4a Full-Load Nominal Efficiencies of Three-Phase Four-Pole Energy-Efficient Open Motorsa a Based on available published data. Chapter 5. This trend will probably continue as the cost of power and the demand for higher-efficiency motors continue to increase.

The motor then runs on the main winding as an induction motor. The typical speed-torque characteristics for a capacitor-start motor are shown in Fig. 14. Note the change in motor torques at the transition point at which the starting switch operates. 6. There will be a substantially wider variation in the values of locked-rotor torque, breakdown torque, and pull-up torque for these single-phase motors than for comparable three-phase motors, and the same variation also exists for efficiency and the power factor (PF).

In general, three-phase electric motors have higher efficiency and power factors and are more reliable since they do not have starting switches or capacitors. In those instances in which three-phase electric motors are not available or cannot be used because of the power supply, the following types of single-phase motors are recommended for industrial and commercial applications: (1) capacitor-start motor, (2) two-value capacitor motor, and (3) permanent split capacitor motor. A brief comparison of single-phase and three-phase induction motor characteristics will provide a better understanding of how single-phase motors perform: 1.

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