me104_lab8

me104_lab8 - ME 104 Sensors and Actuators Fall 2002...

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ME 104 Sensors and Actuators Fall 2002 Laboratory #8 Stepper Motors Department of Mechanical and Environmental Engineering, University of California, Santa Barbara
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November 18, 2002 Revision By Aruna Ranaweera 2
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Introduction In this Laboratory, you will write a LabVIEW VI for generating digital TTL signals that can be used to provide the stepping sequence for a four-phase unipolar stepper motor. You will use this VI to generate the stepping sequence for a unipolar stepper motor. You will then use a function generator and an analog drive circuit to control the rate of rotation of a unipolar stepper motor in full-step mode. As an extra credit exercise, you will build LabVIEW VI’s for controlling the rotation of your stepper motor in full-step mode. The stepper motor you will use in this Laboratory is a four-phase unipolar stepper motor produced by Jameco Electronics (Part #166705). The motor requires a DC Supply Voltage of 12 V and a Current of 140 mA. The motor has a Step Angle of 3.8 ° , Phase Resistance of 84 , and Phase Inductance of 16 mH. The phase and field coil schematic for this stepper motor is shown in Figure 1. Figure 1: Jameco stepper motor phase and field coil schematic. (Colors refer to lead wires directly attached to motor casing). Background Reading Please read the following material prior to this lab: 1. Histand and Alciatore, Introduction to Mechatronics , Section 6.3 and Sections 10.6. 2. Data Sheet , IRLIZ34N HEXFET Power MOSFET , International Rectifier. Available online at www.irf.com/product-info/datasheets/data/irliz34n.pdf. 3. Data Sheet , 74HC191 Synchronous 4-Bit Binary Up/Down Counters with Mode Control , National Semiconductor Corporation. 3
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Data Sheet , 74HC86 Quad 2-Input Exclusive OR Gate , National Semiconductor Corporation. Experiment #1: Build a LabVIEW VI for Simultaneous Generation of Four Digital Signals In this experiment, you will write a LabVIEW VI that simultaneously generates four digital TTL signals that can be used to provide the stepping sequence for a four-phase unipolar stepper motor. Recall that the PCI-6024E DAQ Board has eight digital input/output lines, all of which are TTL by nature. Of these eight lines, the first four lines ( DIO0, DIO1, DIO2, and DIO3 ) have been configured to Read (acquire) TTL signals, while the last four lines ( DIO4, DIO5, DIO6, and DIO7 ) have been configured to Write (generate) TTL signals. 1. Launch LabVIEW and build the VI shown in Figure 2. Each of the four buttons on the front panel is a Square Light that turns on (bright green) when the button (light) is pressed ON and turns off (dark green) when the button is pressed off. To display the Boolean ON (or OFF ) text values for each square light, right-click on the square light and select Show>Boolean Text . You can move the Boolean ON (or OFF ) text values using the Positioning tool. 4
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This note was uploaded on 12/29/2011 for the course ME 104 taught by Professor Staff during the Fall '08 term at UCSB.

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me104_lab8 - ME 104 Sensors and Actuators Fall 2002...

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