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Motor control operations UM0432
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Table 9. "3-phase BLAC/DC (trapezoidal)" advanced parameters
Parameter name Description
Switches PWM frequency Pulse width modulation (PWM) frequency in kHz.
Switches PWM minimum off
time
PWM minimum off time in microseconds (µs) to detect the BEMF.
Complementary PWM signal Enables or disables synchronous rectification.
Dead time Value of dead time in µs (only if complementary PWM enabled).
Current loop
Current blanking window
Time window filter in milliseconds to prevent erroneous sampling of the current
after the PWM is turned ON.
Current event counter filter Defines the number of counter events required to validate a current limitation event.
D and Z sampling parameters
Sampling clock Sets the frequency of the sampling clock for D and Z events in kHz.
Unused MCIx input Defines in which state the unused MCI input is fixed, either "Grounded" or "Hi-Z".
Zero crossing
After D blanking window Sets the blanking window after a D event in microseconds (µs).
Z event counter filter Defines the number of counter events required to validate a Z event.
Threshold voltage Voltage set (in volts) for Z detection.
Demagnetization
After C blanking window Sets the blanking window after a C event in microseconds (µs).
D event counter filter Defines the number of counter events required to validate a D event.
Demagnetization method
Three methods are available: "all hardware", "alternate hardware/software" or "all
software".
Demagnetization time
fixed demagnetization time in microseconds (µs) (only with demagnetization
methods “all software”)
Force duty cycle during
demagnetization Allows using a different value of the duty cycle rather than the one in the run time
setting.
Duty cycle Value of duty cycle percentage forced during demagnetization.
Stop condition
Free wheeling After stopping, the motor continues to spin freely.
DC current braking Enables or disables DC current braking.
Brake level Value of duty cycle percentage of PWM brake signal.
Brake time Duration in milliseconds of the active brake.
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