The book Principles And Practice of Electrical Engineering was written by author Alexander Gray Here you can read free online of Principles And Practice of Electrical Engineering book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Principles And Practice of Electrical Engineering a good or bad book?
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M. = / rr T r> \ k\ - so that since E a is constant, as also is the flux $ 9 once the field circuit resistance is adjusted, therefore the drop in speed between no-load and full-load will seldom exceed 5 per cent. , since I a R a at full-load seldom exceeds 5 per cent, of E a . 128. Electric Drive for Lathes and Boring Mills. Such machines require constant horse-power at all speeds of the machine spindle so long as the FIG 129 amount of metal removed per minute remains unchanged. The motor must ...therefore be large enough to develop the necessary horsepower at the lowest operating speed without excessive heating. The maximum speed of a given motor is limited by centrifugal force or by the speed of the gear, while the minimum speed may be as low as desired, but when constant horsepower is required at all speeds the cost of the motor increases as the minimum speed is decreased as may be seen from the following table: A. A 10-h. P. , 220-volt, 1200-r. P. M. Shunt motor weighs 750 Ib. And costs $150.
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