TIDUF77 June   2024 MSPM0G1507

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Terminology
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TMS320F2800137
      2. 2.3.2 MSPM0G1507
      3. 2.3.3 DRV7308
      4. 2.3.4 UCC28911
      5. 2.3.5 TLV9062
      6. 2.3.6 TLV74033
      7. 2.3.7 ISO6721B
      8. 2.3.8 TMP6131
    4. 2.4 System Design Theory
      1. 2.4.1 Hardware Design
        1. 2.4.1.1 Modular Design
        2. 2.4.1.2 Auxiliary Flyback Power Supply
        3. 2.4.1.3 DC Link Voltage Sensing
        4. 2.4.1.4 Inrush Current Protection
        5. 2.4.1.5 Motor Phase Voltage Sensing
        6. 2.4.1.6 Motor Phase Current Sensing
        7. 2.4.1.7 Over Current Protection of DRV7308
        8. 2.4.1.8 Internal Overcurrent Protection for TMS320F2800F137
      2. 2.4.2 Three-Phase PMSM Drive
        1. 2.4.2.1 Field-Oriented Control of PM Synchronous Motor
          1. 2.4.2.1.1 Space Vector Definition and Projection
            1. 2.4.2.1.1.1 ( a ,   b ) ⇒ ( α , β ) Clarke Transformation
            2. 2.4.2.1.1.2 α , β ⇒ ( d ,   q ) Park Transformation
          2. 2.4.2.1.2 Basic Scheme of FOC for AC Motor
          3. 2.4.2.1.3 Rotor Flux Position
        2. 2.4.2.2 Sensorless Control of PM Synchronous Motor
          1. 2.4.2.2.1 Enhanced Sliding Mode Observer With Phase-Locked Loop
            1. 2.4.2.2.1.1 Mathematical Model and FOC Structure of an IPMSM
            2. 2.4.2.2.1.2 Design of ESMO for the IPMSM
            3. 2.4.2.2.1.3 Rotor Position and Speed Estimation With PLL
        3. 2.4.2.3 Field Weakening (FW) and Maximum Torque Per Ampere (MTPA) Control
        4. 2.4.2.4 Hardware Prerequisites for Motor Drive
          1. 2.4.2.4.1 Motor Current Feedback
            1. 2.4.2.4.1.1 Three-Shunt Current Sensing
            2. 2.4.2.4.1.2 Single-Shunt Current Sensing
          2. 2.4.2.4.2 Motor Voltage Feedback
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Getting Started Hardware
      1. 3.1.1 Hardware Board Overview
      2. 3.1.2 Test Conditions
      3. 3.1.3 Test Equipment Required for Board Validation
    2. 3.2 Getting Started GUI
      1. 3.2.1 Test Setup
      2. 3.2.2 Overview of GUI Software
      3. 3.2.3 Setup Serial Port
      4. 3.2.4 Motor Identification
      5. 3.2.5 Spin Motor
      6. 3.2.6 Motor Fault Status
      7. 3.2.7 Tune Control Parameters
      8. 3.2.8 Virtual Oscilloscope
    3. 3.3 Getting Started C2000 Firmware
      1. 3.3.1 Download and Install Software Required for Board Test
      2. 3.3.2 Opening Project Inside CCS
      3. 3.3.3 Project Structure
      4. 3.3.4 Test Procedure
        1. 3.3.4.1 Build Level 1: CPU and Board Setup
          1. 3.3.4.1.1 Start CCS and Open Project
          2. 3.3.4.1.2 Build and Load Project
          3. 3.3.4.1.3 Setup Debug Environment Windows
          4. 3.3.4.1.4 Run the Code
        2. 3.3.4.2 Build Level 2: Open-Loop Check With ADC Feedback
          1. 3.3.4.2.1 Start CCS and Open Project
          2. 3.3.4.2.2 Build and Load Project
          3. 3.3.4.2.3 Setup Debug Environment Windows
          4. 3.3.4.2.4 Run the Code
        3. 3.3.4.3 Build Level 3: Closed Current Loop Check
          1. 3.3.4.3.1 Start CCS and Open Project
          2. 3.3.4.3.2 Build and Load Project
          3. 3.3.4.3.3 Setup Debug Environment Windows
          4. 3.3.4.3.4 Run the Code
        4. 3.3.4.4 Build Level 4: Full Motor Drive Control
          1. 3.3.4.4.1 Start CCS and Open Project
          2. 3.3.4.4.2 Build and Load Project
          3. 3.3.4.4.3 Setup Debug Environment Windows
          4. 3.3.4.4.4 Run the Code
          5. 3.3.4.4.5 Tuning Motor Drive FOC Parameters
          6. 3.3.4.4.6 Tuning Field Weakening and MTPA Control Parameters
          7. 3.3.4.4.7 Tuning Current Sensing Parameters
    4. 3.4 Test Results
      1. 3.4.1  Fast and clean Rising/Falling Edge
      2. 3.4.2  Inrush Current Protection
      3. 3.4.3  Thermal performance under 300VDC
      4. 3.4.4  Thermal performance under 220VAC
      5. 3.4.5  Overcurrent Protection by Internal CMPSS
      6. 3.4.6  IPM Efficiency with External Bias Supply under 300VDC
      7. 3.4.7  Board Efficiency with Onboard Bias Supply under 300VDC
      8. 3.4.8  Board Efficiency with External Bias Supply under 220VAC
      9. 3.4.9  Board Efficiency with Onboard Bias Supply under 220VAC
      10. 3.4.10 iTHD Test of Motor Phase Current
      11. 3.4.11 Standby Power Test
    5. 3.5 Migrate Firmware to a New Hardware Board
      1. 3.5.1 Configure the PWM, CMPSS, and ADC Modules
      2. 3.5.2 Setup Hardware Board Parameters
      3. 3.5.3 Configure Faults Protection Parameters
      4. 3.5.4 Setup Motor Electrical Parameters
    6. 3.6 Getting Started MSPM0 Firmware
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 Bill of Materials
      3. 4.1.3 PCB Layout Recommendations
      4. 4.1.4 Altium Project
      5. 4.1.5 Gerber Files
    2. 4.2 Software Files
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author
3.3.4.4.6 Tuning Field Weakening and MTPA Control Parameters

The FWC and MTPA functions are added and called in the motor drive ISR to calculate current angle, and then compute the reference currents of the d-axis and q-axis.

  1. Adding the pre-define symbols MOTOR1_FWC and MOTOR1_MTPA in the build configuration of the project as described in Section 3.3.2 for enabling the FWC and MTPA, respectively.
  2. In the user_mtr1.h file, make sure the motor parameters are known and correctly set. In mtpa.h, make sure the tables are set properly for and calculations are set according to the specification of the motor.
  3. Add the variables VsRef_pu, Kp_fwc, and Ki_fwc to the Expressions window in CCS Debug Perspective, and tune these parameters to achieve the expected performance for the field weakening control according to the motor and the system.
  4. After tuning and fixing these variables, record the watch window values with the newly-defined parameters in user_mtr1.h file.

    USER_M1_FWC_VREF = VsRef_pu's value. The factor of the reference voltage for Field Weakening Control.

    USER_M1_FWC_KP = Kp_fwc's value. The Kp gain of PI regulator for Field Weakening Control

    USER_M1_FWC_KI = Ki_fwc's value. The Ki gain of PI regulator for Field Weakening Control

  5. MTPA control parameters are calculated according to the motor parameters, Ld, Lq, and ψm, so there are not any additional parameters to be tuned online.