Lab - 3 - DC Motor Control


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Control of a DC motor using BS2 on a Professional Development Board supplied by Parallax attempted. All the control modes like P, PD and PID are carried. The Pulse Width Modulated signal is used to drive the motor at desired speeds.

This is a part of the Mechatronics course offered by Mechanical and Aerospace Engg. Dept. in Spring 2010.

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Lab - 3 - DC Motor Control

  1. 1. IMPLEMENTATION OF A DC MOTOR SPEED CONTROL MAE 576 [MECHATRONICS] LAB-3 GROUP E Chembrammel Elavunkal Srinivasan Vishwajeet University at Buffalo, Mechatronics, Spring 2010
  2. 2. Problem Statement <ul><li>Creation and calibration of digital sensors - Building and interfacing a digital encoder to quantize and measure angular motions with focus on angular velocity measurement </li></ul><ul><li>Interfacing actuators along with necessary drive electronics –specifically examining the interfacing a DC fan motor to the BS2. </li></ul><ul><li>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); </li></ul><ul><li>Quantitatively logging the resulting data to evaluate the actual performance –specifically examining creation of a real time logging interface using Stamp Plot. </li></ul>
  3. 3. Flow Chart
  4. 4. Plant layout
  5. 5. Circuit Diagram Motor
  6. 6. System implementation
  7. 7. Calibration of optical switch For white back ground The binary value of the voltage switched states at 9mm The range of operation is between 5mm and 9mm
  8. 8. For Black back ground CALIBRATION OF OPTICAL SWITCH CONTD .
  9. 9. The encoder <ul><li>Made out of QRB1114 </li></ul><ul><li>The number of gradations on the reflecting disc is 24 to get a count of 12 cycles per revolution </li></ul><ul><ul><li>Gives better RPM / count by the optical sensor </li></ul></ul>
  10. 10. Measurement Authenticity PIN High PWM (255 Duty) MAX RPM = 6500 +/- 10% MAX VOLT = 10V RPM = 10/12 X 6500 = 5400
  11. 11. Motor drive <ul><li>The motor is driven using PWM values changing the duty cycle </li></ul>PWM RPM Range of operation Calibration of PWM drive
  12. 12. PWM drive calibration result <ul><li>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. </li></ul><ul><li>The range of operation of the motor is 34% to 100% of maximum duty cycle of the input signal. </li></ul>
  13. 13. Tachometer testing 12V Input Low noise high noise 50 ms sampling time 100 ms sampling time Tachometer calibration
  14. 14. On-OFF control 1000 ms 100 ms 50 ms
  15. 15. Differential Gap Control Differential gap
  16. 16. P control
  17. 17. PI Control
  18. 18. PD Control
  19. 19. PID Control
  20. 20. Conclusion <ul><li>Achieved Encoder Implementation </li></ul><ul><li>Familiarized Motor Drive Techniques </li></ul><ul><ul><li>PWM with RC with OPAMP with BJT </li></ul></ul><ul><li>Understood Open Loop Control methods </li></ul><ul><li>Achieved Closed Loop Control Using </li></ul><ul><ul><ul><li>ON/OFF </li></ul></ul></ul><ul><ul><ul><li>ON/OFF with differential gap </li></ul></ul></ul><ul><ul><ul><li>PID family </li></ul></ul></ul><ul><li>Understood Limitations of Digital Systems </li></ul>