Energy-Efficient Electric Motors, Third Edition, Revised and by Ali Emadi
By Ali Emadi
This distinctive reference offers instructions for the choice and usage of electrical vehicles for more advantageous reliability, functionality, energy-efficiency, and life-cycle expense. thoroughly revised and multiplied, the publication displays the hot kingdom of the sphere, in addition to fresh advancements on top of things electronics, the economics of energy-efficient cars and platforms, and complicated strength digital drivers. It contains 5 new chapters overlaying key themes corresponding to the basics of energy electronics appropriate to electrical motor drives, adjustable pace drives and their functions, complex switched reluctance motor drives, and everlasting magnet and brushless DC motor drives.
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Extra resources for Energy-Efficient Electric Motors, Third Edition, Revised and Expanded
Courtesy Magnetek, St. ) Copyright © 2005 by Marcel Dekker 20 Chapter 1 limited extent. The solid-state switch will be the switch of the future as it is refined and costs are reduced. All the switches are set to stay closed and maintain the auxiliary winding circuit in operation until the motor starts and accelerates to approximately 80% of full-load speed. At that speed, the switch opens, disconnecting the auxiliary winding circuit from the power source. The motor then runs on the main winding as an induction motor.
This is illustrated in Fig. 2, which shows the decrease in per unit losses as the horsepower rating increases, thus requiring a larger per unit loss reduction at the higher horsepower ratings for the same efficiency improvement. 4 WHAT IS AN ENERGY-EFFICIENT MOTOR? Until recently, there was no single definition of an energy-efficient motor. Similarly, there were no efficiency standards for standard NEMA design B polyphase induction motors. As discussed earlier, standard motors were designed with efficiencies high enough to achieve the allowable temperature rise for the rating.
The final motor design is a balance among several losses to obtain a high efficiency and still meet other performance criteria, including locked-rotor torque, locked-rotor amperes, breakdown torque, and the power factor. 3 for several horsepower ratings. It is important for the motor designer to understand this loss distribution in order to make design changes to improve motor efficiency. In a very general sense, the average loss distribution for standard NEMA design B motors can be summarized as follows: This loss distribution indicates the significance of design changes to increase the electric motor efficiency.