barcode reader code in c# net The machine of example 177 is being used in a in Software

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1723 The machine of example 177 is being used in a
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series connection That is, the eld coil is connected in series with the armature, as shown in Figure P1723 The machine is to be operated under the same conditions as in the previous example, that is, n = 120 rev/min, Ia = 8 A In the operating region, = kIf , and k = 200 The armature resistance is 02 , and the resistance of the eld winding is negligible a Find the number of eld winding turns necessary for full-load operation b Find the torque output for the following speeds: 1 2 n = 2n n = 3n 3 4 n = n/2 n = n/4
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1728 A PM DC motor with torque constant kPM is used
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to power a hydraulic pump; the pump is a positive displacement type and generates a ow proportional to the pump velocity: qp = kp The uid travels
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c Plot the speed-torque characteristic for the conditions of part b
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through a conduit of negligible resistance; an accumulator is included to smooth out the pulsations of the pump A hydraulic load (modelled by a uid resistance, R) is connected between the pipe and a reservoir (assumed at zero pressure) Sketch the motor-pump circuit Derive the dynamic equations for the system and determine the transfer function between motor voltage and the pressure across the load
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1729 A shunt motor in Figure P1729 is characterized
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by a eld coef cient kf = 12 V-s/A-rad, such that the back emf is given by the expression Eb = kf If , and the motor torque by the expression T = kf If Ia The motor drives an inertia/viscous friction load with parameters J = 08 kg-m2 and b = 06 N-m-s/rad The eld equation may be approximated by VS = Rf If The armature resistance is Ra = 075 , and the eld resistance is Rf = 60 The system is perturbed around the nominal operating point VS0 = 150 V, 0 = 200 rad/s, Ia0 = 40 A, respectively a Derive the dynamic system equations in symbolic form b Linearize the equations you obtained in part a
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Armature control Assume a constant eld with Vf = 100 V; now simulate the response of the system when the armature voltage changes in step fashion from 50 V to 75 V Save and plot the current and angular speed responses Field control Assume a constant armature voltage with Va = 100 V; now simulate the response of the system when the eld voltage changes in step fashion from 75 V to 50 V This procedure is called eld weakening Save and plot the current and angular speed responses
1732 Determine the transfer functions from input
voltage to angular velocity and from load torque to angular velocity for a PM DC motor rigidly connected to an inertial load Assume resistance and inductance parameters Ra , La let the armature constant be ka Assume ideal energy conversion, so that ka = kT The motor has inertia Jm and damping coef cient bm , and is rigidly connected to an inertial load with inertia J and damping coef cient b The load torque TL acts on the load inertia to oppose the magnetic torque 1733 Assume that the coupling between the motor and the inertial load of the proceding problem is exible (eg, a long shaft) This can be modeled by adding a torsional spring between the motor inertia and the load inertia Now we can no longer lump the two inertias and damping coef cients as if they were one, but we need to write separate equations for the two inertias In total, there will be three equations in this system: 1 the motor electrical equation 2 the motor mechanical equation (Jm and Bm ) 3 the load mechanical equation (J and B) a Sketch a diagram of the system b Use free-body diagrams to write each of the two mechanical equations Set up the equations in matrix form c Compute the transfer function from input voltage to load inertia speed using the method of determinants
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