1. OBJECTIVE

The goal of this laboratory is the experimental measurements of voltage, current and speed of a separately excited DC machine. The laboratory will reinforce the basic concepts learned during the lectures:

• Open loop speed control
• IR drop compensation to achieve constant speed operation with changing load

Please refer to the textbook [1], Chapter 2 for details.

2. EXPERIMENTAL SET-UP

• 2.1  Student Design Center (SDC) and Laboratory Setup Description
• • Figure 1: Schematics of the lab set up
  • Figure 2: The workbench with devices used for this lab experiment
  • Figure 3: Power supply, DC motor and dynamometer cabinet
  • Figure 4: Semikron box
  • Figure 5: Student design center (SDC) including FPGA board and interface board
  • Figure 6: Remote laboratory student interface window

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• 2.2  Separately excited DC motor operation and control
• • Figure 7: IGBT A+ gate drive signal generation with IR compensation

3. POWER UP

• 3.1  Applying Power to the Experiment
• • Figure 6: Remote Laboratory Student Interface

4. MEASUREMENTS

• 4.1  Measurements with no compensation
• • Table I: Data for the case without IR compensation at various speed voltages
  • Table II: Data for the case with IR compensation at various speed voltages

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• 4.2  Measurements with compensation
• • Table III: Data for the case with IR compensation at various loads with speed setting #1
  • Table IV: Data for the case with IR compensation at various loads with speed setting #2

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5. REPORT

• 5.1  Writing a Detailed Report

6. REFERENCES

• [1]  P.C. Krause, O. Wasynczuk, S. D. Sudhoff, Analysis of Electric Machinery and Drive Systems, IEEE Press, 2002.
• [2]  Xilinx® “Spartan-3 Starter Kit Board User Guide”, UG130 (v1.1) May 13, 2005, available online at: http://www.xilinx.com/support/documentation/boards_and_kits/ug130.pdf
• [3]  Xilinx® “System Generator for DSP -Getting Started Guide” Release 10.1 March, 2008, available online at: http://www.xilinx.com/support/sw_manuals/sysgen_gs.pdf
• [4]  XILINX® Products and Services, "ChipScopeTM Pro and the Serial I/O Toolkit", available online at http://www.xilinx.com/tools/cspro.htm
• [5]  Semikron® Products Marketing Information, "Power electronics systems (SEMISTACK)," http://www.semikron.com/internet/index.jsp?sekId=361