BLDC motor phase detection method based on back electromotive force wave crests and wave troughs
A technology of phase detection and back EMF, applied in the direction of electronically commutated motor control, electrical components, control systems, etc., can solve the problems of large changes in detection results, large influence of reference phase, reference phase fluctuations, etc., to avoid excessive detection errors Large and strong anti-disturbance effect
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Embodiment 1
[0017] 1a. The back EMF peak and valley detection is performed through the drive line of the BLDC motor, and the periodic signal of the potential change with time is obtained;
[0018] 1b. The periodic signal that the potential changes with time is transmitted to the filter circuit module, and the analog signal is obtained after being filtered by the filter circuit module, and the analog signal is converted into a digital pulse signal I through a differential trigger circuit; figure 1 As shown, digital pulse signal I generates digital pulses at π of phase a, 2π / 3 of phase b, and π / 3 of phase c.
[0019] 1c. The digital pulse is used for phase angle compensation in the CPU of the DSPIC microcontroller to obtain the commutation angle of the BLDC motor.
Embodiment 2
[0021] 2a. The back EMF peak and valley detection is performed through the drive line of the BLDC motor, and the periodic signal of the potential change with time is obtained;
[0022] 2b. The periodic signal that the potential changes with time is transmitted to the high-speed ADC and converted into a digital pulse signal II, and the digital pulse signal II is filtered by a digital filter to obtain a digital pulse signal III, and the digital pulse signal III is then passed through a peak and valley detection algorithm to obtain a digital pulse signal IV; if figure 1 As shown, digital pulse signal IV generates digital pulses at π of phase a, 2π / 3 of phase b, and π / 3 of phase c.
[0023] 2c. The digital pulse is used for phase angle compensation in the CPU of the DSPIC microcontroller to obtain the commutation angle of the BLDC motor.
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