Motor Controller PWM Phase Sequence Adjustment

The patent applies preliminary action by pre-defining fixed phase sequences for PWM signals before execution. The control unit determines a phase sequence for PWM signals based on current detection requirements, and adjusts duty cycles while maintaining this predetermined phase sequence. This ensures that current detection is performed during appropriate energization periods while preventing harmful current waveform distortion that would otherwise occur with arbitrary phase changes.

The patent changes the parameter of phase sequence from a dynamic variable to a controlled fixed parameter. By determining a specific phase sequence for PWM signals and maintaining it during duty cycle adjustments, the system transforms the naturally varying phase relationships into a stable, predetermined sequence that enables reliable current detection while eliminating unwanted noise generation.

The patent applies preliminary action by pre-determining the phase sequence of PWM signals before current detection occurs. The control unit establishes a fixed phase sequence that ensures current detection is performed during appropriate energization periods of the PWM signals. This preliminary determination of phase sequence maintains consistent detection timing across different operating conditions while preserving detection accuracy.

The patent uses feedback by detecting phase currents during PWM energization periods and using this information to adjust duty cycles while maintaining the predetermined phase sequence. The current detection results feed back to the control unit, which adjusts duty cycles without altering the established phase sequence, thereby maintaining detection timing consistency while improving control accuracy.