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.

Show description

Read or Download Energy-Efficient Electric Motors, Third Edition, Revised and Expanded PDF

Best electric books

Operation and Control in Power Systems

In strength approach engineering, virtually all result of smooth keep watch over idea could be utilized. Such an software will bring about a less expensive, simpler and better carrier caliber operation and in much less inconvenience relating to irregular stipulations. For its analytical remedy, keep an eye on approach layout in most cases calls for the selection of a mathematical version from which the regulate method might be derived.

Power Electronics Applied to Industrial Systems and Transports, Volume 1: Synthetic Methodology to Converters and Components Technology

Energy electronics relies at the switching working mode of semiconductor parts. in this foundation, the techniques of style (voltage or present) and reversibility of interconnected resources give the opportunity to use a technique for the synthesis of assorted forms of converters. right here the writer provides the foremost kinds of parts to be had, constantly from a user’s viewpoint, with the gate drive/fire keep watch over and different auxiliary circuits which are required for his or her right functioning (snubbers, for example).

Civil works for hydroelectric facilities : guidelines for life extension and upgrade

''Civil Works for Hydroelectric amenities: directions for all times Extension and Upgrade'' explores methodologies and methods for utilizing rehabilitation engineering to getting older hydroelectric infrastructure. This record offers directions for all times extension and improve of hydroelectric works to be used via proprietors, operators, regulators, and engineers contemplating infrastructure rehabilitation or substitute.

Extra resources for Energy-Efficient Electric Motors, Third Edition, Revised and Expanded

Example text

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.

Download PDF sample

Rated 4.55 of 5 – based on 33 votes