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Tham khảo tài liệu 'electric machinery fundamentals power & energy_15', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 11. Page 623 Figure P9-2 and Figure P9-3 RA 0.40 Q and RF 100 Q . Values are stated correctly in the text but shown incorrectly on the figure. 12. Page 624 Figure P9-4 RA RS 0.44 Q and RF 100 Q . Values are stated correctly in the text but shown incorrectly on the figure. 13. Page 627 Problem 9-21 Radj is currently set to 90 Q. Also the magnetization curve is taken at 1800 r min. 14. Page 627 Problem 9-22 RA is 0.18 Q. 15. Page 630 Figure P9-10 RA RS 0.21 Q NSE is 20 turns. Values are stated correctly in the text but shown incorrectly on the figure. 16. Page 680 Problem 10-6 refers to Problem 10-5 instead of Problem 10-4. 303 cha65239_ch01.qxd 10 16 2003 9 54 AM 56 ELECTRIC MACHINERY FUNDAMENTALS 1-4. A motor is supplying 60 N m of torque to its load. If the motor s shaft is turning at 1800 r min what is the mechanical power supplied to the load in watts In horsepower 1-5. A ferromagnetic core is shown in Figure P1-2. The depth of the core is 5 cm. The other dimensions of the core are as shown in the figure. Find the value of the current that will produce a flux of 0.005 Wb. With this current what is the flux density at the top of the core What is the flux density at the right side of the core Assume that the relative permeability of the core is 1000. FIGURE P1-2 The core of Problems 1-5 and 1-16. 1-6. A ferromagnetic core with a relative permeability of 1500 is shown in Figure P1-3. The dimensions are as shown in the diagram and the depth of the core is 7 cm. The air gaps on the left and right sides of the core are 0.070 and 0.050 cm respectively. Because of fringing effects the effective area of the air gaps is 5 percent larger than their physical size. If there ar 400yturns in the coil wrapped around the center leg of the core and if the current in the coil is 1.0 A what is the flux in each of the left center and right legs of the core What is the flux density in each air gap 1-7. A two-legged core is shown in Figure P1-4. The winding on the left leg of the core
