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]

5.3 Faster Startup Timing

Option 1: Initial Position Detection (IPD):

  1. Go to Optimal Startup in the Optimization Wizards page, select IPD, and click the Next button.
  2. Increase IPD current threshold (A) [IPD_CURR_THR] to the rated current of the motor.
  3. Increase IPD clock value [IPD_CLK_FREQ] to a higher frequency up to a value where the device does not trigger IPD frequency fault.
  4. Set IPD repeating times [IPD_REPEAT] to 1 time.
  5. Set Open loop current limit configuration [OL_ILIMIT_CONFIG] to Open loop current limit defined by ILIMIT.
  6. Increase Open loop acceleration coefficient A1 [OL_ACC_A1] and Open loop acceleration coefficient A2 [OL_ACC_A2].
    Note: A1 and A2 can be increased until open loop current reaches Lock detection current threshold [LOCK_ILIMIT]. Open loop current can be measured using oscilloscope.

    Increasing Open loop acceleration coefficient A1 [OL_ACC_A1] and Open loop acceleration coefficient A2 [OL_ACC_A2] might trigger LOCK_LIMIT fault. If this happens, reduce A1 and A2 until LOCK_LIMIT fault no longer triggers.

  7. For ultra-fast startup time (less than 100 ms) it is recommended to follow below steps.
    1. Disable auto-handoff [AUTO_HANDOFF].
    2. Configure open to closed loop handoff threshold [OPN_CL_HANDOFF_THR] to a value lesser than or equal to 20 Hz.
  8. For startup times above 100ms, it is recommended to follow below steps:
    1. Enable auto-handoff [AUTO_HANDOFF].
    Note: If Abnormal speed fault [ABN_SPEED] gets triggered, it is recommended to decrease open loop acceleration constants [OL_ACC_A1] and [OL_ACC_A2] and also retune IPD by increasing the IPD current threshold [IPD_CURR_THR] and IPD repeat times [IPD_REPEAT].
  9. Increase Closed loop acceleration rate [CL_ACC].
    Note: LOCK_LIMIT fault handling:

    Closed loop acceleration rate [CL_ACC] can be increased until closed loop current reaches Lock detection current threshold [LOCK_ILIMIT]. Closed loop current can be measured using oscilloscope. Increasing closed loop acceleration rate [CL_ACC] might trigger LOCK_LIMIT. If this happens, reduce closed loop acceleration rate [CL_ACC] until no longer triggers.

Option 2: Align

  1. Go to Optimal Startup in the Optimization Wizards page, select Align, and click the Next button for instructions to set up the Align startup method.
  2. Configure align time [ALIGN_TIME] to 10 ms.
  3. Follow Step 6 to Step 9 in Option 1.

Figure 5-4 shows FG, phase current and motor electrical speed waveform. Motor takes 50 ms to reach target speed from zero speed.

Phase Current, FG and Motor Speed - Faster Startup Time Figure 5-4 Phase Current, FG and Motor Speed - Faster Startup Time
Note: If Abnormal speed fault [ABN_SPEED] or Loss of sync [LOSS_OF_SYNC] fault gets triggered, it is recommended to follow below debug steps:
  1. Select Double align as the motor startup method in [MTR_STARTUP].
  2. Increase align time [ALIGN_TIME].
  3. Configure align current threshold [ALIGN_OR_SLOW_CURRENT_ILIMIT] to 50% of ILIMIT.
  4. Configure First cycle frequency select [FIRST_CYCLE_FREQ_SEL] to 0.