High-precision and high-bandwidth signal processing method

Abstract

The invention discloses a high-precision and high-bandwidth signal processing method, which comprises two parts, namely a novel synchronous fundamental frequency extraction filter and a frequency detection unit. The method can accurately estimate the frequency of an input signal by utilizing the frequency detection unit and feed back the frequency to the novel synchronous fundamental frequency extraction filter on the premise that the input signal is known. Therefore, high-frequency harmonics in the input signals are eliminated, fundamental components are extracted, the output estimation signals are free of amplitude attenuation and phase lag relative to the input signals, the control precision is improved, the pass band is high, and the system is easy to stabilize. The signal processing method has high universality, can be widely applied to various fields, and enables the system to work efficiently and stably.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a signal processing technology in a permanent magnet synchronous motor control system. Background technique [0002] The permanent magnet synchronous motor system without position sensor has the advantages of low cost and high robustness, and is currently an important research direction in the field of AC drive. Rotor position estimation is the key to sensorless control of PMSMs. The back-EMF of the motor contains the rotor angle information. In the high-speed area of ​​the motor, the use of back-EMF to estimate the rotor position is the preferred method. [0003] Harmonics and high-frequency noises caused by control algorithms, dead-time effects, load disturbances, etc. make the back EMF estimated by the position sensor contain noise and harmonics. How to extract rotor position information is a difficult research point. The rotor position of the motor can be obtained directly by t...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the large delay in the existing filter, and the existing signal processing method of the filter plus a phase-locked loop has defects such as low observation accuracy and poor real-time performance, and the purpose is to provide a high-precision bandwidth Advanced signal processing method, so that the output estimated signal has neither amplitude attenuation nor phase lag relative to the input signal, which improves the control accuracy and solves the above problems

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