Chapter 10 DC machines and drives

... . 2 26 6 1 41 10 6 04 10 3 53 310 7 1 41 10 6 04 10 0 357 3 22 6 × +× × = − −− ) (. ) /(. ) .A (10B-6) From (10B-4) , ω r = × × − × × = − −− − 141 10 604 10 0 357 1 604 10 353 10 249 2 66 3 . . . . (. ... B m r = × = × =× ⋅⋅ −− − 2 12 10 2 12 10 351 1 604 10 33 6 . . ω Nms (10A-5) BASIC TYPES OF DC MACHINES 393 EXAMPLE 10B The permanent-magnet dc machine...

Ngày tải lên: 16/02/2014, 18:48

... standard file system for Sys- tem V and gav e it this name. Previously it was called the Berkeley Fast File System,orffs. filesys.mm,v v4.17 (2003/04/02 06:43:57) 191 Chapter 10: File systems and ... groups of rwx: r stands for read permission, w stands for write permission, and x stands for execute permission. The three groups represent the permissions for the owner,the group and ot...

Ngày tải lên: 22/10/2013, 19:15

... SYNCHRONOUS MACHINES AND DRIVES • A controller with inputs the desired speed, the flux directionin the stator and the stator currents, and outputs the desired currents in the stator Figures 7.18 and 7.19 ... value and γ = 90 o . Calculate again the angle between I s and I F , the speed, and the power factor. P = −3V s I F cos β ⇒ cos β = − 1500 3 · 38.12 · 40 = −0.32 ⇒ β = 1...

Ngày tải lên: 25/01/2014, 13:20

... 0 0 aa E n n E ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ = (7.23) 12 13 Chapter 7 DC Machines  Dc machines are characterized by their versatility.  By means of various combinations of shunt-, series-, and separately-excited field ... series, and compound excitation. Figure 7.6 Speed-torque characteristics of dc motors. §7.4 Analytical Fundamentals: Electric-Circuit Aspects...

Ngày tải lên: 14/02/2014, 16:44

... have made the error undetectable. Example 10. 2 (continued) 10. 19 Table 10. 1 A code for error detection (Example 10. 2) 10. 1 Chapter 10 Error Detection and Correction Copyright © The McGraw-Hill ... receiver replaces 0100 1 with 0101 1 and consults the table to find the dataword 01. Example 10. 3 (continued) 10. 24 Table 10. 2 A code for error correction (Example 10. 3...

Ngày tải lên: 16/02/2014, 20:20

... project. Figure 10. 3 Two relation schemas suffering from update anomalies Note: The above figure is now called Figure 10. 3 in Edition 4 Figure 10. 4 Example States for EMP_DEPT and EMP_PROJ Note: ... name and location PNUMBER -> {PNAME, PLOCATION}  employee ssn and project number determines the hours per week that the employee works on the project {SSN, PNUMBER} -> HOURS...

Ngày tải lên: 12/05/2014, 11:55

... build-up. Sclater Chapter 10 5/3/01 1:07 PM Page 351 352 DRIVES FOR CONTROLLING TENSION Mechanical, electrical, and hydraulic methods for obtaining controlled tension on winding reels and similar drives, ... these, such as cams, rollers, push-rods, and traveling nuts, are described and illustrated. 358 Sclater Chapter 10 5/3/01 1:08 PM Page 358 359 Sclater Chapter 10...

Ngày tải lên: 22/10/2012, 14:26

Ngày tải lên: 14/12/2013, 12:15

... 5 6 7 8 9 10 11 12 $100 100 100 100 100 100 100 100 100 100 100 100 $ 30 50 60 65 75 90 110 140 180 230 300 395 $ 130 150 160 165 175 190 210 240 280 330 ... workers and no machines or thirty machines and no workers. Or it can combine labor and machinery in various ways. It can employ four workers at a total expenditure of $400 and...

Ngày tải lên: 17/12/2013, 15:19

... CCNA Exploration 4.0 Chapter 10 - Planning and Cabling Networks Học viện mạng Bách khoa - Website: www.bkacad.com Operating System Features • features and services such as: – Security – ... telephone or computer. • Work Areas – EIA/TIA standard: From end devices to the wall jacks have a maximum length of 10 meters. – Straight-through cable and crossover cable is typically us...

Ngày tải lên: 22/12/2013, 13:17