Principles And Practice of Electrical Engineering
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In our eReader you can find the full English version of the book. Read Principles And Practice of Electrical Engineering Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Principles And Practice of Electrical Engineering
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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.
What to read after Principles And Practice of Electrical Engineering?
You can find similar books in the "Read Also" column, or choose other free books by Alexander Gray to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after Principles And Practice of Electrical Engineering?
You can find similar books in the "Read Also" column, or choose other free books by Alexander Gray to read onlineMoreLess
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