Phase adaptive compensation type permanent magnet synchronous motor rotor position and speed estimation method

The invention discloses a phase adaptive compensation type permanent magnet synchronous motor rotor position and speed estimation method. The method comprises the steps of 1, calculating alpha-axis and beta-axis extended counter electromotive forces; 2, filtering harmonic components in the alpha-axis and beta-axis extended counter electromotive forces by adopting a filter, and solving the initial estimation position of the rotor; 3, constructing a pair of sine and cosine alternating current signals with the phase difference of 90 degrees by utilizing the initial estimation position of the rotor, and filtering the pair of alternating current signals through the filter in the step 2; 4, forming a complex number by the pair of alternating current signals filtered in the step 3, and calculating a phase angle; 5, subtracting the phase angle from the initial estimation position of the rotor to obtain a phase delay angle; 6, adding the initial estimation position of the rotor and the phase delay angle to obtain an e