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barcode reader code in c# net Introduction to Electric Machines in Software
17 QR Code Recognizer In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. QR Code 2d Barcode Generation In None Using Barcode generation for Software Control to generate, create Quick Response Code image in Software applications. Introduction to Electric Machines
Decoding QR Code 2d Barcode In None Using Barcode reader for Software Control to read, scan read, scan image in Software applications. Printing QR Code In C#.NET Using Barcode creator for Visual Studio .NET Control to generate, create QR Code image in .NET framework applications. Shunt wound motor: Field connected in parallel with the armature With constant armature voltage and eld excitation, the motor has good speed regulation ( at speedtorque characteristic) Compound wound motor: Field winding has both series and shunt components This motor offers better starting torque than the shunt motor, but worse speed regulation Series wound motor: The eld winding is in series with the armature The motor has very high starting torque and poor speed regulation It is useful for lowspeed, hightorque applications Permanentmagnet motor: Field windings are replaced by permanent magnets The motor has adequate starting torque, with speed regulation somewhat worse than that of the compound wound motor Creating QR Code ISO/IEC18004 In VS .NET Using Barcode maker for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications. Paint QR Code ISO/IEC18004 In Visual Studio .NET Using Barcode generator for Visual Studio .NET Control to generate, create QR Code image in .NET framework applications. EXAMPLE 176 DC Shunt Motor Analysis
Encode QR In VB.NET Using Barcode generator for .NET framework Control to generate, create QRCode image in VS .NET applications. USS Code 39 Encoder In None Using Barcode maker for Software Control to generate, create Code39 image in Software applications. Problem
Encode Bar Code In None Using Barcode maker for Software Control to generate, create bar code image in Software applications. Encode Universal Product Code Version A In None Using Barcode generation for Software Control to generate, create UPC Symbol image in Software applications. Find the speed and torque generated by a fourpole DC shunt motor
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W = 2238 W hp
Next, we compute the armature current as the difference between source and eld current (equation 1734): Ia = Is If = 30 14 = 286 A The noload armature voltage, Eb , is given by: Eb = Vs Ia Ra = 240 286 06 = 22284 V and equation 1710 can be used to determine the armature constant: ka = 4 1000 Vs pN = = 15915 2 M 2 4 Wbrad Ea = ka Knowing the motor constant, we can calculate the speed, after equation 1725: rad 22284 V = 70 Vs s 0002 Wb 15915 Wbrad Finally, the torque developed by the motor can be found as the ratio of the power to the m = Part III
Electromechanics
angular velocity: T = 2,238 W P = 32 Nm = rad m 70 s
EXAMPLE 177 DC Shunt Motor Analysis
Problem
Determine the following quantities for the DC shunt motor, connected as shown in the circuit Figure 1721: 1 2 3 4 Field current required for fullload operation Noload speed Plot the speed torque curve of the machine in the range from noload torque to rated torque Power output at rated torque Is If
8 7 Emf (volts) 6 Ra + 5 4 3 2 1
Rf Vs Rx
Eb
Figure 1721 Shunt motor con guration
01 02 03 04 05 06 07 08 09 10 Field current (amps) Figure 1722 Magnetization curve for a small DC motor
Solution
Known Quantities: Magnetization curve, rated current, rated speed, circuit parameters Find: If ; nnoload ; T n curve, Prated Schematics, Diagrams, Circuits, and Given Data: Figure 1722 (magnetization curve) Motor ratings: 8 A, 120 rev/min Circuit parameters: Ra = 02 ; Vs = 72 V; N = number of coil turns in winding = 200 Analysis: To nd the eld current, we must nd the generated emf since Rf is not known Writing KVL around the armature circuit, we obtain V s = Eb + I a Ra Eb = Vs Ia Ra = 72 8(02) = 56 V 17
Introduction to Electric Machines
Having found the back emf, we can nd the eld current from the magnetization curve At Eb = 56 V, we nd that the eld current and eld resistance are 72 = 12 06 To obtain the noload speed, we use the equations If = 06 A and Rf = E b = ka leading to Vs = Ia Ra + Eb = Ia Ra + ka or n= Vs I a Ra ka (2 /60) 2 n 60 2 n 60 T = ka Ia At no load, and assuming no mechanical losses, the torque is zero, and we see that the current Ia must also be zero in the torque equation (T = ka Ia ) Thus, the motor speed at no load is given by nnoload = Vs ka (2 /60) We can obtain an expression for ka knowing that, at full load, 2 n 60 so that, for constant eld excitation, Eb = 56 V = ka k a = Eb 60 2 n = 56 60 2 (120) = 044563 V s rad Finally, we may solve for the noload speed, in rev/min: nnoload = 72 Vs = ka (2 /60) (044563)(2 /60) = 1543 rev/min 3 The torque at rated speed and load may be found as follows: Trated load = ka Ia = (044563)(8) = 3565 Nm n (rev/min) 154 120 0 3565 T (Nm) Now we have the two points necessary to construct the torquespeed curve for this motor, which is shown in Figure 1723 The power is related to the torque by the frequency of the shaft: Prated = T m = (3565) or, equivalently, P = 448 W 1 hp = 006 hp 746 W 120 2 = 448 W 60

