me104_lab7

Me104_lab7 - ME 104 Sensors and Actuators Fall 2002 Laboratory#7 Open Loop Digital Control Of a DC Motor Department of Mechanical and Environmental

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ME 104 Sensors and Actuators Fall 2002 Laboratory #7 Open Loop Digital Control Of a DC Motor Department of Mechanical and Environmental Engineering, University of California, Santa Barbara
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November 12, 2002 Revision By Aruna Ranaweera 2
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Introduction In Laboratory #4, you learned how to drive a DC Motor using an analog voltage signal and also how to measure and view both (analog) angular velocity and (analog) angular position feedback signals from the motor. In this laboratory, you will learn how to obtain and view digital feedback signals from the motor. The digital feedback signals will be obtained from two separate sources: a Slotted Disc and a 4-bit Gray-Code Disc . You will also learn how to drive the motor using a digital Pulse Width Modulated (P.W.M.) signal. Figure 1: MS15 DC Motor Control Module All digital outputs from the DC motor module are Transistor-Transistor Logic or TTL by nature. This means that logic low is defined as a value less than 0.7 V, while logic high is defined as a value greater than 2.5 V. Typically, logic low is close to 0 V and logic high is close to 5 V. The digital input/output lines on the DAQ Board 1 are configured to accept TTL signals. Background Reading Please read the following material prior to this lab: 1. Histand and Alciatore, Introduction to Mechatronics , Sections 6.1-6.3 and Section 9.2.4 2. DC Motor Control Module User Manual , Pages 3-7 and 14-16 , LJ Technical Systems Inc. 1 The PCI-6024E DAQ Board has eight digital input/output channels. 3
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3. LabVIEW Data Acquisition Basics Manual , Pages 15-1 to 15-2 and 16-2 to 16-3. Available online at www.ni.com/pdf/manuals/320997c.pdf. Experiment #1: View Digital Feedback from Slotted Disc Output of DC Motor Module In this experiment, you will use a LabVIEW VI to drive your DC motor using an analog voltage signal, similar to what you did in Laboratory #4. At the same time, you will use your oscilloscope to view both analog velocity feedback from the tacho generator output and digital feedback from the Slotted Disc output. 1. Prepare (set the appropriate switches on) your DC motor control module so that you can drive the motor with analog voltage input and also obtain analog velocity feedback from the tacho generator output. 1 2. To drive the motor using the analog voltage output from the DAQ board, connect your motor control module to the CB-68LP connector block as shown in Table 1. 1 If necessary, see Lab #4, Experiment #2, Steps 1-3. 4 P O DAQ board Tacho Generator Sensor PC Drive Circuits DC Motor DC Motor Module D/A Converter Shaft Rotation V IN V OUT Oscilloscope Channel 1 Channel 2 Slotted Disc Sensor A/D Converter DAC0OUT ACH0
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Table 1: CB-68LP connector block pin assignments for open loop analog control of DC motor velocity. DC Motor Control Module
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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_lab7 - ME 104 Sensors and Actuators Fall 2002 Laboratory#7 Open Loop Digital Control Of a DC Motor Department of Mechanical and Environmental

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