SLAU927A March   2024  – June 2024 MSPM0G3507

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Hardware Setup
    1. 2.1  EVM Hardware Setup
      1. 2.1.1 EVM Hardware Support
    2. 2.2  Pin Configurations for IPD Usage
    3. 2.3  Pin Configurations for PWM Outputs
    4. 2.4  Pin Configurations for ADC Currents
    5. 2.5  Pin Configurations for ADC Voltages
    6. 2.6  Pin Configurations for Faults
    7. 2.7  Pin Configurations for GPIO Output Functions
    8. 2.8  Pin Configurations for SPI Communication
    9. 2.9  Pin Configurations for UART Communication
    10. 2.10 External Connections for Evaluation Boards
  6. 3Software Setup
    1. 3.1 Software Support
  7. 4GUI Setup
  8. 5Register Map
    1. 5.1 User Control Registers (Base Address = 0x20200400h)
    2. 5.2 User Input Registers (Base Address = 0x20200000h)
    3. 5.3 User Status Registers (Base Address = 0x20200430h)
  9. 6Basic Tuning
    1. 6.1 System Configuration Parameters
      1. 6.1.1 Configuring System Parameters from GUI
      2. 6.1.2 Motor Resistance in Milliohms (mΩ)
      3. 6.1.3 Motor Inductance in Microhenries (μH)
      4. 6.1.4 Saliency of IPMSM Motor
      5. 6.1.5 Motor BEMF Constant
      6. 6.1.6 Base Voltage (V)
      7. 6.1.7 Base Current (A)
      8. 6.1.8 Maximum Motor Electrical Speed (Hz)
    2. 6.2 Control Configurations for Basic Motor Spinning
      1. 6.2.1 Basic Motor Startup
        1. 6.2.1.1 Disable ISD
        2. 6.2.1.2 Motor Start Option - Align
        3. 6.2.1.3 Motor Open Loop Ramp
        4. 6.2.1.4 Motor Open Loop Debug
      2. 6.2.2 Controller Configuration for spinning the Motor in Closed Loop
        1. 6.2.2.1 PI Controller Tuning for Closed Loop Speed Control
        2. 6.2.2.2 Testing for Successful Startup Into Closed Loop
    3. 6.3 Fault Handling
      1. 6.3.1 Abnormal BEMF Fault [ABN_BEMF]
      2. 6.3.2 Monitoring Power Supply Voltage Fluctuations for Voltage Out of Bound Faults
      3. 6.3.3 No Motor Fault [NO_MTR]
  10. 7Advanced Tuning
    1. 7.1 Control Configurations Tuning
      1. 7.1.1  Initial Speed Detection of the Motor for Reliable Motor Resynchronization
      2. 7.1.2  Unidirectional Motor Drive Detecting Backward Spin
      3. 7.1.3  Preventing Back Spin of Rotor During Startup
      4. 7.1.4  Gradual and Smooth Start up Motion
      5. 7.1.5  Faster Startup Timing
      6. 7.1.6  Stopping Motor Quickly
      7. 7.1.7  Flux Weakening : Operating Motor at Speeds Higher than Rated Speed
      8. 7.1.8  Maximum Torque Per Ampere : Improve Efficiency of IPMSM Motors
      9. 7.1.9  Preventing Supply Voltage Overshoot During Motor Stop.
      10. 7.1.10 Protecting the Power Supply
      11. 7.1.11 FOC Bandwidth Selection
  11. 8Hardware Configurations
    1. 8.1 Direction Configuration
    2. 8.2 Brake Configuration
    3. 8.3 Main.h Definitions
    4. 8.4 Real Time Variable Tracking
  12. 9Revision History

6.1.7 Base Current (A)

Base current represents the maximum measurable motor phase current in the motor control system. The user inputs the system base current (in Amps) in the currentBase parameter of the System Configuration page in GUI. The user can compute the system base current based on the current sense amplifier gain (CSAGAIN) in volts/amp and the full-scale ADC voltage (FSV) of 3.3V as shown in Equation 8. There is a factor of 2 considered to support bidirectional current sensing with 1.65V as the zero-current offset.

Equation 8. B a s e C u r r e n t = A D C   F u l l   S c a l e   V a l u e 2 * C S A G A I N V A = 3.3 V 2 * C S A G A I N V A

For example, in a system with CSAGAIN = 0.15V/A , the base current or maximum measurable system current by the ADC is 3.3V / (2 × 0.15V/A) = 11A.

Note: In some driver devices, CSAGAIN can be set as a register over I2C or SPI or by hardware using a resistor value. See the driver data sheet for how to configure the driver CSAGAIN setting.

If the system uses a current sense resistor (RSENSE) with CSAGAIN units mentioned in volts/volt (V/V), the CSA gain in volts/amp can be computed using Equation 9.

Equation 9. C S A G A I N V A = R S E N S E × C S A G A I N   [ V V ]