Rotary transformer decoding method and system

Abstract

Embodiments of the invention provide a rotary transformer decoding method and system. The method comprises the steps of acquiring a sine feedback signal and a cosine feedback signal of the rotary transformer, and a rotor rotating speed obtained by a phase-locked loop, then calculating and obtaining a target d-q axis voltage component according to the sine feedback signal and the cosine feedback signal; then determining a negative sequence component weight corresponding to the rotor rotating speed according to rotor rotating speed obtained by the phase-locked loop, and decoupling a positive sequence d-q axis voltage component and a negative sequence d-q axis voltage component according to the negative sequence component weight, so as to obtain a target positive sequence q axis component; and finally, inputting the target positive sequence q axis component into the phase-locked loop so as to obtain an angle and a speed of the rotary transformer. Decoupling input parameters are determinedaccording to the rotor rotating speed obtained by the phase-locked loop, then the phase-locked loop responds more rapidly, for example, when the rotor is in a first speed range, input parameters input in the decoupling unit are reduced, a DDSRF-PLL manner is changed into an SRF-PLL manner for phase locking, so that the phase-locked loop responds more rapidly.

Description

technical field [0001] The invention relates to the technical field of new energy motor control, in particular to a resolver decoding method and system. Background technique [0002] The output voltage of the resolver will change with the rotor angle, so in the motor control system, it is often used to obtain the rotor position of the motor. [0003] Such as figure 1 As shown, the resolver has one primary winding (excitation winding) and two secondary windings (feedback winding), wherein the two secondary windings (u1 and u2) are arranged in a 90-degree quadrature. When a high-frequency excitation voltage is applied to the excitation winding, a high-frequency induced voltage whose amplitude is modulated by the rotor position can be obtained on the feedback winding, and the rotor position of the motor can be obtained through a certain decoding algorithm. [0004] Specifically, such as figure 2 As shown, assuming that a high-frequency excitation sinusoidal voltage u0 is ap...

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Problems solved by technology

[0010] However, the inventors found that the above-mentioned phase-locking method, when the rotor speed is in the low-speed region, takes a long time to obtain the rotor position, which cannot meet the requirements for obtaining the rotor position in real time.

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