barcode reader code in c# net Part III in Software

Encoding QR Code ISO/IEC18004 in Software Part III

Part III
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the rotor will align in accordance with the direction of the magnetic eld developed in the stator By reversing the phase of the currents in the coils, or by energizing only some of the coils (this is possible in motors with more than two stator poles), the alignment of the stator magnetic eld can take one of a discrete number of positions; if the currents in the coils are pulsed in the appropriate sequence, the rotor will advance in a step-by-step fashion Thus, this type of motor can be very useful whenever precise incremental motion must be attained As mentioned earlier, typical applications are printer wheels, computer disk drives, and plotters Other applications are found in the control of the position of valves (eg, control of the throttle valve in an engine, or of a hydraulic valve in a uid power system), and in drug-dispensing apparatus for clinical applications The following examples illustrate the operation of a four-pole, two-phase permanent-magnet stepping motor, and of a similar motor of the variable-reluctance type The operation of these motors is representative of all stepping motors
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EXAMPLE 183 Analysis of Two-Phase, Four-Pole Step Motor
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Determine the full-step single-phase, full-step two-phase, and half-step current excitation sequences for the PM step motor of Figure 1810
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Known Quantities: Phase currents Find: Full-step sequence for the motor Assumptions: The motor currents at the start of the sequence are i1 > 0 and i2 = 0 Analysis: With the initial currents assumed (phase 1 energized), the motor will be at rest
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Figure 1810 Two-phase four-pole PM stepper motor
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if the rotor is in the position shown in Figure 1810 A single-phase sequence consists of turning on each of the two coils in sequence, reversing the polarity of the currents every other time Then, the PM rotor will align with the stator poles according to the polarity of the magnetic eld generated by each coil s pole pair For example, if coil 1 is turned off and coil 2 is turned on with a positive current polarity, the rotor will rotate clockwise by 90 Table 181 depicts the (bipolar) sequence of coil currents, and the corresponding motor position
Table 181 Fullstep, single-phase sequence i1 + 0 0 + i2 0 + 0 0 0 90 180 270 0
Table 182 Fullstep, two-phase sequence i1 + + + i2 + + + 45 135 225 315 45
Table 183 Half-step sequence i1 + + 0 0 + + i2 0 + + + 0 0 0 45 90 135 180 225 270 315 0
18
Special-Purpose Electric Machines
If both coils are activated, it is possible to cause the rotor to align between stator poles, also in increments of 90 , but shifted in phase by 45 with respect to the single-phase stepping sequence Table 182 illustrates this stepping sequence Finally, if one combines the two sequences (easily accomplished, since the current commands for the two sequences are distinct), it is possible to obtain increments of 45 Table 183 depicts the half-step sequence Any ner resolution would require increasing the number of windings and teeth in the stator
Comments: The simplicity of the electronic controls required by this type of machine is
one of the very attractive features of step motors
EXAMPLE 184 Analysis of Variable-Reluctance Step Motor
Problem
Determine the current excitation sequences required to achieve 45 steps in the VR step motor of Figure 1811
SA SB
SC SD VB
Figure 1811 Two-phase four-pole VR stepping motor
Solution
Known Quantities: Phase currents Find: Current excitation sequence for 45 steps Assumptions: The motor currents at the start of the sequence are i1 > 0 and i2 = 0 Analysis: The operation of the variable-reluctance (VR) step motor (with a salient-pole
rotor) is simpler than that of the PM type, because the rotor is not magnetically polarized, and therefore it is not necessary to have bipolar currents to achieve the desired rotor motion The stator of Figure 1810 is excited by DC currents supplied by a single (unipolar) voltage supply The switches shown in the gure could be controlled by a logic circuit similar to the ones described in s 13 and 14 Note that four separate coils are used Figure 1812 depicts how the rst three steps of the sequence could be achieved These are summarized in Table 184
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