barcode reader code in c# net Figure 1724 Speed control in DC motors in Software

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Figure 1724 Speed control in DC motors
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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
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Introduction to Electric Machines
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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
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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
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a S b' + Vf c N a' ia a b BS c'
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150 100 50 Amps 0
a' n b' Stator windings c'
ib b ic c
100 150 0 0005 001 0015 002 t3 Time (s) 0025 003 0035
Figure 1725 Two-pole three-phase stator
Figure 1726 Three-phase stator winding currents
Part III
Electromechanics
terminal, would then be given by the expressions va = A cos( e t) vb = A cos e t vc = A cos e t + 2 3 2 3
where e is the frequency of the AC supply, or line frequency The coils in each winding are arranged in such a way that the ux distribution generated by any one winding is approximately sinusoidal Such a ux distribution may be obtained by appropriately arranging groups of coils for each winding over the stator surface Since the coils are spaced 120 apart, the ux distribution resulting from the sum of the contributions of the three windings is the sum of the uxes due to the separate windings, as shown in Figure 1727 Thus, the ux in a three-phase machine rotates in space according to the vector diagram of Figure 1728, and is constant in amplitude A stationary observer on the machine s stator would see a sinusoidally varying ux distribution as shown in Figure 1727
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