By E. M Talbott

ISBN-10: 0881731455

ISBN-13: 9780881731453

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Extra resources for Compressed air systems: a guidebook on energy and cost savings

Sample text

After synchronous speed is reached, motor speed is independent of load, up to the pull-out point, as shown in Figure 3-12. The Page 37 Figure 3-8 Relationship of Current, Voltage, and Power in Resistive and Inductive Loads Fairbanks, Morse & Co. Page 38 primary difference between induction and synchronous motors is that the rotor field coils of the synchronous motor are supplied with a separate dc excitation current rather than relying on slip-generated current. The synchronous motor normally has a small inductive component on the rotor to enable motor starting since the pure synchronous motor has zero torque at rest.

After the required system capacity is determined, an initial estimate of compressor capacity can be made. 2. 2 Compressor Drivers Alternating current (ac) electric motors are by far the most common drivers used for industrial plant air compression. It is only in special applications that other drivers are feasible, such as installations that have low cost or surplus steam or natural gas. 1 Alternating Current Electric Motors Large electric motors are available in two basic types: induction and synchronous.

These describe specific energy conservation practice, recommendations, experience, and economic analyses. 5 Other Considerations Finally, it should be noted that in emphasizing energy conservation this guidebook addresses part of a large subject. The factory manager must, in the final analysis, be responsible for his choices and operations and thus must consider all aspects of compressed air systems such as acoustic effects, safety, and bottom-line economics. In this regard, it would not be inappropriate to question the use of compressed air at all in certain applications.

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