SLLU374 November   2024 MCF8329A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Hardware Design and Setup
    1. 2.1 Board Design
      1. 2.1.1 External MOSFET Selection
      2. 2.1.2 Gate Resistor Selection
      3. 2.1.3 Bootstrap and GVDD Capacitor Selection
      4. 2.1.4 Current Shunt Resistor Selection
      5. 2.1.5 VREG MOSFET Selection
      6. 2.1.6 Additional External Power Stage Components
  6. 3Connecting to the GUI
  7. 4Spinning Into Closed Loop
    1. 4.1 Essential Configuration
      1. 4.1.1 Loading Recommended Default Values
      2. 4.1.2 Setting Base Current
      3. 4.1.3 Setting Current Limits
      4. 4.1.4 Setting Voltage Limits
      5. 4.1.5 Input the Motor's Phase Resistance and Inductance
      6. 4.1.6 Maximum Electrical Speed (Hz)
      7. 4.1.7 Run MPET to Identify Motor Parameters
        1. 4.1.7.1 Skipping MPET Measurements
    2. 4.2 Testing for Successful Startup Into Closed Loop
  8. 5Basic Controls
    1. 5.1 Speed Input Mode
    2. 5.2 Preventing Back Spin of Rotor During Startup
    3. 5.3 Faster Startup Timing
    4. 5.4 Improving Speed Regulation
    5. 5.5 Limiting and Regulating Supply Power
    6. 5.6 MTPA Tuning
    7. 5.7 Motor Studio Optimization Wizards
  9. 6Fault Handling
    1. 6.1 MPET BEMF FAULT [MPET_BEMF_FAULT]
    2. 6.2 Abnormal BEMF Fault [ABN_BEMF]
    3. 6.3 Lock Current Limit [LOCK_LIMIT]
    4. 6.4 Hardware Lock Current Limit [HW_LOCK_LIMIT]
    5. 6.5 No Motor Fault [NO_MTR]
    6. 6.6 Abnormal Speed [ABN_SPEED]

4.1.3 Setting Current Limits

All the current limits within the MCF8329A are set as a percent of the value programmed into the BASE_CURRENT bit field. For example, if BASE_CURRENT is set to 37.5A and ILIMIT is set to 50%, then the current limit set by ILIMIT will be 18.75A.

HW_LOCK_ILIMIT and LOCK_ILIMIT are configurable current limits intended to protect the system from damage. It is recommended to set these limits to two times higher than the motors rated peak phase current. If the motors rated peak phase current falls between two adjacent limit settings in the configuration, choose the higher of the two settings.

Current Protection Limits Figure 4-4 Current Protection Limits

ILIMIT, OL_ILIMIT, ALIGN_OR_SLOW_CURRENT_ILIMIT, and IPD_CURR_THR are the max current that are used by the motor driver during the various stages of motor operation. It is recommended to set these values to less than or equal to the rated max phase current of the motor.

OL_ILIMIT, ALIGN_OR_SLOW_CURRENT_ILIMIT, and IPD_CURR_THR Current Limits Figure 4-5 OL_ILIMIT, ALIGN_OR_SLOW_CURRENT_ILIMIT, and IPD_CURR_THR Current Limits
ILIMIT Current Limit Figure 4-6 ILIMIT Current Limit