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Lab 7 ME104 20 - ME 104 Sensors and Actuators Laboratory#7 Stepper Motors Department of Mechanical Engineering University of California Santa

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ME 104 Sensors and Actuators Laboratory #7 Stepper Motors Department of Mechanical Engineering University of California, Santa Barbara (Rev. 2006)
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Introduction In this Laboratory, a LabVIEW VI for generating digital TTL signals is used to provide the stepping sequence for a four-phase 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. 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 Ω , and Phase Inductance of 16 mH. The phase and field coil schematic for this stepper motor is shown in Figure 1. stepper motor coil +12 φ 1 φ 2 φ 3 φ 4 wht/orange orange brown blue wht/brn Figure 1: Jameco stepper motor phase and field coil schematic. Colors refer to lead wires. 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 on melab share drive: Z:\ME 104\Lab 7 3. Data Sheet , 74LS191 Synchronous 4-Bit Binary Up/Down Counters with Mode Control . Available on melab share drive: Z:\ME 104\Lab 7 4. Data Sheet , 74LS86 Quad 2-Input Exclusive OR Gate . Available on melab share drive: Z:\ME 104\Lab 7 2
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Signals In this experiment, you will use 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. The PCI-6024E DAQ Board has one digital input/output port ( P0 ) with eight channels, all of which are TTL (transistor-to-transistor logic). Of these eight channels, the first four channels ( P0.0, P0.1, P0.2, and P0.3 ) have been configured to Read (acquire) TTL signals, while the last four channels ( P0.4, P0.5, P0.6, and P0.7 ) have been configured to Write (generate) TTL signals. 1. Open Write_DigOut.vi from the melab share drive. The VI is shown in Figure 2. Figure 2. This VI generates four digital output signals that are used to provide the stepping sequence for a four-phase unipolar stepper motor. 2. Choose an appropriate * Digital Ground ( D GND ) pin on your CB-68LP connector block and provide (define) ground to that pin using the black (-) terminal of the “5 V FIXED 3 A” output from your Tektronix PS280 DC Power Supply * . You do not need to turn on the power supply. * Choose a D GND pin that is reasonably close to the four Digital I/O channels (pins) you are using. 3
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This note was uploaded on 01/04/2011 for the course ME 104 taught by Professor Staff during the Spring '08 term at UCSB.

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Lab 7 ME104 20 - ME 104 Sensors and Actuators Laboratory#7 Stepper Motors Department of Mechanical Engineering University of California Santa

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