Permanent magnet synchronous motor rotor position and speed detection method based on orthogonal phase-locked loop

Abstract

The invention discloses a permanent magnet synchronous motor rotor position and speed detection method based on an orthogonal phase-locked loop, and aims to solve the problem of high requirements on rotor position and speed signal precision in vector control of a permanent magnet synchronous motor by utilizing a detection signal of a single linear Hall sensor based on a positive and negative sequence component separation thought. The method comprises the following steps of: extracting a positive sequence component in a single linear Hall sensor detection signal under a rotating coordinate system by utilizing the characteristic that a positive sequence component and a negative sequence component in a Hall signal respectively represent an alternating current quantity and a direct current quantity under the rotating coordinate system, and synchronizing phases between an output signal and an input signal through an orthogonal phase-locked loop; therefore, zero-static-error tracking of an output rotor position estimation value on an input signal phase is realized, and rotor position and speed detection of the permanent magnet synchronous motor is realized. According to the method, the problem that amplitude deviation and phase deviation exist among a plurality of Hall signals in a traditional rotor position detection scheme of the permanent magnet synchronous motor is well solved, the algorithm implementation and the system structure are simple, and the robustness is high.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor rotor position and speed detection technology, in particular to a permanent magnet synchronous motor rotor position and speed detection method based on a quadrature phase-locked loop. Background technique [0002] Permanent magnet synchronous motors have the advantages of high efficiency, high power factor and reliable operation, and are widely used in industrial production, aerospace and household appliances. In the vector control of permanent magnet synchronous motor, the accuracy of rotor position and speed signal is relatively high, and the control system needs to obtain rotor position information in real time. From the perspective of adaptability to various working conditions, the current use of mechanical sensors is to obtain permanent magnet synchronous motor The most reliable solution for rotor position information. [0003] Hall sensors have the advantages of small size, simple str...

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to provide a permanent magnet synchronous motor rotor position and speed detection method based on a quadrature phase-locked loop, which solves the problem of the existence of amplitude values ​​among multiple Hall signals in the traditional rotor position detection scheme of permanent magnet synchronous motors. The problem of deviation and phase deviation, the algorithm is simple to implement, the system structure is simple and robust

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