SLLA661 April   2025 MCF8315A , MCF8315C , MCF8315C-Q1 , MCF8315D , MCF8316A , MCF8316C-Q1 , MCF8316D , MCF8329A , MCF8329A-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Prerequisites to Run the Motor with MOTORSTUDIO
  6. 3Getting Started with MOTORSTUDIO
    1. 3.1 Motor Parameters
      1. 3.1.1 Manual Measurements
        1. 3.1.1.1 Entering Manual Measurements Into MOTORSTUDIO
      2. 3.1.2 Motor Parameter Extraction Tool Measurements
        1. 3.1.2.1 Motor BEMF Constant Measurement Through MPET – Along With Motor Resistance and Motor Inductance for MCF8315C, 16C
        2. 3.1.2.2 Mechanical Parameters (SPD_LOOP_KP, SPD_LOOP_KI) Measurement Through MPET
  7. 4Motor Runs
  8. 5Summary
  9. 6References

3.1.1 Manual Measurements

In manual measurements, use lab equipment and motor data sheet to identify the motor parameters as mentioned in Table 3-2.

Table 3-2 Manual Measurements and How to Measure Them
Manual Measurements How to Measure
Motor phase resistance Using the instructions in the Motor Parameters FAQ measure the phase resistance and inductance along with the BEMF constant of the motor
Motor phase inductance
Motor BEMF constant
BASE_CURRENT (applicable for MCF8329A only) This register setting depends on the shunt resistor used on the board. Refer the MCF8329A Tuning Guide for calculating BASE_CURRENT
Rated speed of the motor (MAX_SPEED) The maximum rated speed of the 3-phase BLDC motor (in Hz). Typically found in the data sheet of the motor. If the mechanical speed is in RPM (N) convert the value to electrical frequency (f in Hz) using the formula: f = P x N / 120. P is the number of rotor poles
Rated current of the motor

The rated peak phase current value for the 3-phase BLDC motor when this is driven at rated speed and rated voltage with load. Typically found in the data sheet of the motor.
Note: For the MCF8329A, the motor phase resistance and phase inductance has to be measured manually. For MCF8315C/16C, motor phase resistance and phase inductance can be measured automatically in MOTORSTUDIO using MPET. Table 3-2 shows instructions for manual measurements only. However the Motor BEMF constant can be measured either manually or using the MPET for all devices in MOTORSTUDIO.