Reliability optimization method and system for polarity identification of permanent magnet synchronous motor magnetic pole

Abstract

The invention discloses a reliability optimization method and system for polarity identification of a permanent magnet synchronous motor magnetic pole. The method comprises the steps: acquiring the rotor initial magnetic pole position information through a pulsating high-frequency voltage signal injection method, and injecting a pulse voltage signal into each of the positive and negative directions of a permanent magnet synchronous motor straight shaft to obtain current sampling data in the positive and negative directions of the straight shaft; based on the current sampling data, setting thelength of the sliding window, and carrying out characteristic value calculation on the current sampling data; and selecting a comparison value from the two eigenvalue sequences to compare eigenvalues,wherein the eigenvalue with a larger eigenvalue is an N pole, and the eigenvalue with a smaller eigenvalue is an S pole. According to the reliability optimization method for identifying the magneticpole polarity of the permanent magnet synchronous motor provided by the invention, the difference between current pulse peak values in positive and negative directions of a direct axis can be increased; based on the permanent magnet synchronous motor stator iron core magnetic saturation nonlinear principle, the polarity of the rotor magnetic pole of the permanent magnet synchronous motor can stillbe stably identified under the working condition environment of large current harmonic waves, and the reliability is optimized and improved.

Description

technical field [0001] The invention belongs to the field of speed sensorless control of permanent magnet synchronous motors, and more specifically relates to a reliability optimization method and system for magnetic pole identification of permanent magnet synchronous motors. Background technique [0002] Permanent magnet synchronous motor has the advantages of simple structure, reliable operation, small size, light weight, high efficiency, high power factor, small moment of inertia, strong overload capacity, etc., and is widely used in various industries of the national economy. In order to meet the needs of high-precision, high-performance permanent magnet synchronous motor AC drive, closed-loop speed control is essential. The realization of speed and position feedback control requires a tachogenerator or a photoelectric encoder to detect the feedback and magnetic pole position. In order to effectively extract the rotor position and speed of the motor, a common method is t...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a method and system for optimizing the reliability of the magnetic pole polarity identification of the permanent magnet synchronous motor, aiming at solving the problem of the magnetic pole polarity existing in the initial position identification process of the existing permanent magnet synchronous motor rotor. The problem of low reliability of gender identification

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