Self-Regulating Alternator

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Self-Regulating Alternator Powered By Docstoc
					Garry Vondrasek
Charlie Wolfe

Project 46

ECE 345
TA: Julio Urbina
•   Motivation
•   Define Terms
•   Excitation
•   Synchronous Motor
•   Small Signal Scaling
• Self-Regulating     DC Motor   Synchronous
                                                                       VOUT


• Stable
                                 Machine


                                            IF

• 5% Tolerance Goal for
  800 - 1500 RPM                 Variable
                                 DC Power
                                 Supply               PID Controller
                                                 VC
• Implement with PID
  control scheme
• System Identification
• PID Controller Design
• Interface with DC
  power supply
• Modifications
• Challenges
VOUT
           e                  K Pe
                   KP



               e             K I  edt       VC

       S           KI
                                        S
                                   de
                              KD
               e                   dt
                        d
                   KD
                        dt

VREF
                      ˆ AC
                     VOUT                           DC
                                                  VOUT               -VOUT 
                                                                         DC
                                                                                        V REF
  AC
VOUT     Buffer                  AC  DC
                                                         INV                    S
                                                                                e(t )
       Y   K I  e(t ) dt      K I  e(t ) dt           e(t )dt
                                                  KI                   
                          INV




  VC  X  Y                   X  Y             X   K P e(t )
                      INV                  S                           KP
                                                                                                  5 VDC




                      10k                                            10k                                             LED

                                                                                              10k             10k

                        4




                                                                       4




                                                                                                                     4
        10k                            RECTIFIER       10k
 V            2                    1                         2                    1                       2                       1
                        V-




                                                                       V-




                                                                                                                      V-
 (in)             -          OS1                                 -          OS1         10k                    -           OS1        10k
                  BUFFER           6                             INVERT           6                           SUBTR               6
                            OUT                                            OUT                                           OUT
              3                    5                         3                    5                       3                       5
                        V+




                                                                       V+




                                                                                                                      V+
                  +          OS2       15k           220uF       +          OS2                                +           OS2
                        7




                                                                       7




                                                                                                                     7
                        10k                                          100k POT                                 10uF
                        4




                                                                       4




                                                                                                                     4
                                                                                                                                      10k
              1                    2                         1                    2                       1                       2
                        V-




                                                                       V-




                                                                                                                      V-
                  OS1          -             10k                 OS1          -             10k                OS1            -
              6         INVERT                               6         I-GAIN                             6            INTEG
                  OUT                                            OUT                                           OUT
              5                    3                         5                    3                       5                       3
                        V+




                                                                       V+




                                                                                                                      V+
                  OS2          +                                 OS2          +                                OS2            +
                        7




                                                                       7




                                                                                                                     7
                      10k                                              10k                                         100k POT
                                                                                      10k
                        4




                                                                       4




                                                                                                                     4
                                                                                        10k                                           10k
              1                    2                         1                    2                       1                       2
                        V-




                                                                       V-




                                                                                                                      V-
                  OS1          -               10k               OS1          -                                OS1            -
V             6         INVERT                               6         SUMMER                             6            P-GAIN
(OUT)             OUT                                            OUT                                           OUT
              5                    3                         5                    3                       5                       3
                        V+




                                                                       V+




                                                                                                                      V+
                  OS2          +                                 OS2          +                                OS2            +
                        7




                                                                       7




                                                                                                                     7
                     Table 1. VOLTAGE-LOAD DATA
• Summer Testing
                     800 RPM               1500 RPM
  for Error signal   Voltage R (load) Voltage R (load)
                          3.99 Infinity    3.99 infinity
• Determining K           3.90        500 3.84         500
                          3.81        250 3.72         250
                          3.75        167 3.61         167
• Max / min               3.69        125 3.56         125
                          3.64        100 3.45         100
  Overshoot on
                          3.60          81 3.39          81
  transients              3.56          71 3.33          71
                          3.52          63 3.28          63
                          3.49          56 3.24          56
• Voltage versus          3.46          50 3.21          50
  Load
• Design Objectives Met; Exceeded

• Tolerances satisfied

• Ways to improve: adding D-term, making
  robust under variable loads

				
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