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Synchronous fundamental frequency extraction filter

A filter and fundamental frequency technology, which is applied in the field of synchronous fundamental frequency extraction filters, can solve problems affecting system dynamic characteristics, quality factor changes, etc., and achieve high universality, high-pass frequency band, efficient and stable work effects

Pending Publication Date: 2020-05-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a synchronous fundamental frequency extraction filter, which overcomes the defect that the quality factor of the existing synchronous frequency tracking filter changes with the fluctuation of the input signal frequency and affects the dynamic characteristics of the system

Method used

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Embodiment Construction

[0032] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0033] Such as image 3 As shown, it is a synchronous fundamental frequency extraction filter control block diagram provided by the present invention. The filter is a closed-loop control, including two branches of sine and cosine; the input signal must be multiplied by the filter gain ε to get x(t); x(t) must be multiplied by ω 0 get a(t); a(t) passes through two branches of sine and cosine; the sine branch is multiplied by a(t) by reference signal sin(ω 0 t) gets a(t) 1 ;a(t) 1 Get b(t) through the integration link 1 ; b(t) 1 Then with the reference signal sin(ω 0 t) multiplied to get c(t) 1 ; The cosine branch is multiplied by a(t) by the reference signal cos(ω...

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Abstract

The invention discloses a synchronous fundamental frequency extraction filter, which is in closed-loop control and comprises a sine branch and a cosine branch, wherein multiplying the difference between an input end signal X (t) and an output end signal X * by the filter gain obtains x (t); multiplying the x (t) by the input signal frequency omega0 tracked by the synchronous fundamental frequencyextraction filter obtains a (t); the a (t) to passes through the sine branch and the cosine branch; multiplying the a (t) by a reference signal sin (omega0t) obtains a (t) 1 in the sine branch; b (t)1 is obtained from a (t) 1 through an integration link; multiplying the b (t) 1 by a reference signal sin (omega0t) obtains c (t) 1; in the cosine branch, multiplying a (t) by a reference signal cos (omega0t) obtains a (t) 2; b (t) 2 is obtained from a (t) 2 through an integration link; multiplying the b (t) 2 by a reference signal cos (omega0t) obtains c (t) 2; adding the sine branch and the cosine branch obtains a filter output end signal X *, and the X * is fed back to an input end to form complete closed-loop control. The filter can eliminate input high-frequency harmonic waves, extract fundamental wave components and achieve a phase-shift-free filtering function, so that the control precision is improved, a high pass band is achieved, and the system is easy to stabilize; and the method has relatively high universality.

Description

technical field [0001] The invention relates to a synchronous fundamental frequency extraction filter, which belongs to the technical field of filters in signal processing. Background technique [0002] Permanent magnet synchronous motors have the advantages of high efficiency, high power density, and no carbon brushes, and have been widely used in servo applications. In the field of servo application technology, there are two types of position sensor control and positionless control. The mechanical sensor detects the rotor position of the motor, and calculates the rotor speed by differentiating the rotor position. The obtained speed value often has large noise; For noise, the rotor position of the motor can be obtained directly by the arc tangent of the back EMF, and the rotor speed can be obtained by differential calculation, and the speed value will also have large noise. This kind of noise is adjusted and amplified by the speed loop, which will cause larger glitches in...

Claims

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Application Information

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IPC IPC(8): H03H17/02H02P6/182G05B11/42
CPCH03H17/02H02P6/182G05B11/42H03H2017/0072
Inventor 章春娟王慧贞刘伟峰路通宋洁傅子锐
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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