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178 A series motor draws a current of 25 A and develops a torque of 100 N-m Find: (a) the torque when the current rises to 30 A if the eld is unsaturated; and (b) the torque when the current rises to 30 A and the increase in current produces a 10 percent increase in ux 179 A 200-V DC shunt motor draws 10 A at 1,800 rev/min The armature circuit resistance is 015 and the eld winding resistance is 350 What is the torque developed by the motor

17

1710 Describe the cause-and-effect behavior of the speed control method of changing armature voltage for a shunt DC motor

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From the previous sections, it should be apparent that it is possible to obtain a wide range of performance characteristics from DC machines, as both motors and generators A logical question at this point should be, Would it not be more convenient in some cases to take advantage of the single- or multiphase AC power that is available virtually everywhere than to expend energy and use additional hardware to rectify and regulate the DC supplies required by direct-current motors The answer to this very obvious question is certainly a resounding yes In fact, the AC induction motor is the workhorse of many industrial applications, and synchronous generators are used almost exclusively for the generation of electric power worldwide Thus, it is appropriate to devote a signi cant portion of this chapter to the study of AC machines, and of induction motors in particular The objective of this section is to explain the basic operation of both synchronous and induction machines, and to outline their performance characteristics In doing so, we shall also point out the relative advantages and disadvantages of these machines in comparison with direct-current machines The motor movies included in the CD-ROM may help you visualize the operation of AC machines

4 The application must provide a means for the end user to view an employee s data This requirement indicates that there will be a BROWSING SCREEN for finding and selecting the employee whose detailed information will then be displayed on an INQUIRY SCREEN We expect that there will be eight data elements on the browsing screen and ten on the inquiry screen Provision of both screens requires reading the employee data and system parameters

In this exercise, you will move your ReportToFile class from your BugReporter.exe to a new ReportMaker.dll component file. Next, you will reference the new ReportMaker.dll from your BugReporter.exe project. Then, you will reference the Validations.dll from ReportMaker.dll (again, see Figure 6-7). Lastly, you will add code to the Description property to demonstrate how validations can be implemented in this program. 1. Create a new Project. 2. In the New Project dialog box, choose the Class Library template and name the new project ReportMaker. 3. In Solution Explorer, you will see that a new Class1.cs or Class1.vb file was created, but you do not need this file. So, right-click on that file and choose Delete from the pop-up menu. 4. Using the Project Add Existing Item menu selection, add the ReportToFile.vb or ReportToFile.cs class file from the BugReporter project you made in Exercise 6-4 to your new project . 5. Like the test harness you used in Exercise 6-4, you want the ReportToFile class to use the Strings class in the Validations.dll. So, add a reference from the ReportMaker project to the Validations.dll by selecting Project Add Reference and browse to the Validations.dll you created in Exercise 6-5. 6. Locate the Decription property in the ReportToFile class and add code to validate that this property is not blank. Your code should look like this:

Rotating Magnetic Fields As mentioned in Section 171, the fundamental principle of operation of AC machines is the generation of a rotating magnetic eld, which causes the rotor to turn at a speed that depends on the speed of rotation of the magnetic eld We shall now explain how a rotating magnetic eld can be generated in the stator and air gap of an AC machine by means of AC currents Consider the stator shown in Figure 1725, which supports windings a-a , b-b and c-c The coils are geometrically spaced 120 apart, and a three-phase voltage is applied to the coils As you may recall from the discussion of AC power in 7, the currents generated by a three-phase source are also spaced by 120 , as illustrated in Figure 1726 The phase voltages referenced the neutral

a S b' + Vf c N a' ia a b BS c'

a' n b' Stator windings c'

100 150 0 0005 001 0015 002 t3 Time (s) 0025 003 0035

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