Motor drive control method and system

The invention discloses a motor drive control method and system, and the method comprises the steps: outputting a first high-frequency drive signal based on a first duty ratio, so as to enable the equivalent waveform of the first high-frequency drive signal to be a first equivalent waveform, the amplitude of the first equivalent waveform is the maximum value from 0 to T/2, is gradually reduced from T/2 to t1, is the minimum value from t1 to t2, and is gradually increased from t2 to T, T is a preset dynamic adjustment period, and t1 and t2 are both larger than T/2 and smaller than T; a second high-frequency driving signal is output based on a second duty ratio, so that the equivalent waveform of the second high-frequency driving signal is a second equivalent waveform, the amplitude of the second equivalent waveform is gradually reduced from 0 to t3, the amplitude of the second equivalent waveform is the minimum value from t3 to t4, the amplitude of the second equivalent waveform is gradually increased from t4