Lab - 3 - DC Motor Control
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Transcript of Lab - 3 - DC Motor Control
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IMPLEMENTATION OF A
DC MOTOR SPEED CONTROL
MAE 576 [MECHATRONICS] LAB-3GROUP E
Chembrammel Elavunkal Srinivasan Vishwajeet
University at Buffalo, Mechatronics, Spring 2010
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Problem Statement
Creation and calibration of digital sensors - Building and interfacing a digital encoder to quantize and measure angular motions with focus on angular velocity measurement
Interfacing actuators along with necessary drive electronics –specifically examining the interfacing a DC fan motor to the BS2.
Using different control laws to try to achieve desired performance criteria-specifically examining one or more of the following control schemes(on-off ,P, PI,PD,PID);
Quantitatively logging the resulting data to evaluate the actual performance –specifically examining creation of a real time logging interface using Stamp Plot.
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Flow Chart
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Plant layout
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Circuit Diagram
Motor
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System implementation
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Calibration of optical switch
For white back ground
The binary value of the voltage switched states at 9mmThe range of operation is between 5mm and 9mm
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For Black back ground
CALIBRATION OF OPTICAL SWITCH CONTD.
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The encoder
Made out of QRB1114 The number of gradations on the
reflecting disc is 24 to get a count of 12 cycles per revolution Gives better RPM / count by the optical
sensor
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Measurement Authenticity
PIN HighPWM (255 Duty)
MAX RPM = 6500 +/- 10%MAX VOLT = 10VRPM = 10/12 X 6500 = 5400
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Motor drive
The motor is driven using PWM values changing the duty cycle
PWM
RPM
Range of operation
Calibration of PWM drive
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PWM drive calibration result
The PWM cannot drive the motor below the 34% duty-cycle, which corresponds to 1.7 volts for the amplifier gain of 2. This corresponds to a cut-off voltage of 3.5V of the motor, and a motor speed of 1000 rpm.
The range of operation of the motor is 34% to 100% of maximum duty cycle of the input signal.
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Tachometer testing
12V Input
Low noise
high noise
50 ms sampling time
100 ms sampling time
Tachometer calibration
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On-OFF control
1000 ms
100 ms
50 ms
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Differential Gap Control
Differential gap
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P control
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PI Control
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PD Control
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PID Control
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Conclusion
Achieved Encoder Implementation
Familiarized Motor Drive Techniques
PWM with RC with OPAMP with BJT
Understood Open Loop Control methods
Achieved Closed Loop Control Using ON/OFF
ON/OFF with differential gap
PID family
Understood Limitations of Digital Systems