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Method and system for resonant frequency tracking of linear oscillating motor based on double correlation algorithm

A technology of oscillating motors and resonant frequency, applied in control systems, control generators, vector control systems, etc., can solve problems such as the resonant operating point being easily disturbed, poor dynamic response performance, and large amount of computation, and achieve transient fluctuations Situation suppression, improvement of dynamic performance, and improvement of steady-state performance

Active Publication Date: 2022-07-05
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the existing phase difference control algorithm has the problems of large amount of calculation, poor dynamic response performance and easy to be affected by disturbance near the resonance operating point.

Method used

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  • Method and system for resonant frequency tracking of linear oscillating motor based on double correlation algorithm
  • Method and system for resonant frequency tracking of linear oscillating motor based on double correlation algorithm
  • Method and system for resonant frequency tracking of linear oscillating motor based on double correlation algorithm

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Embodiment

[0046] The motor selected in this embodiment is a stator permanent magnet type double stator linear oscillating motor with a rated power of 120W, a rated operating frequency of 22.1Hz, a stator resistance of 18.4Ω, a stator inductance of 0.755H, a thrust coefficient of 28N / A, and a dynamic The mass of the sub-piston is 1.03kg.

[0047] The invention provides a linear oscillation motor resonance frequency tracking control algorithm, such as figure 1 shown, including the following steps:

[0048] S1. Obtain sampling signals of displacement and current of the linear oscillating motor, and perform quadrature processing on the current signals;

[0049] Specifically, the second-order generalized integrator (SOGI) is used to process the current signal, and the transfer function of SOGI is:

[0050]

[0051] Among them, ω' is the center frequency, which corresponds to the frequency of the current waveform. In the program, ω' is configured as the real-time driving frequency of the...

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Abstract

The invention discloses a method and a system for tracking the resonance frequency of a linear oscillating motor based on a double correlation algorithm, and belongs to the technical field of frequency control of the linear oscillating motor. The method includes using a second-order generalized integrator to process the current signal, and using a dual-correlation phase detection algorithm to perform dual-correlation calculation on the displacement and current sampling signals to obtain the cotangent of the phase difference, and feedback control of the input voltage frequency. The method proposed by the invention can directly obtain the cotangent value of the motor displacement and the current phase difference through calculation, so as to achieve fast and accurate tracking of the resonance operating point of the system, and has the characteristics of fast dynamic response speed and strong anti-interference in steady-state operation. , and the calculation amount of the algorithm itself is very small, the performance requirements of the control chip are very low, and the application is widely used.

Description

technical field [0001] The invention belongs to the technical field of linear oscillation motor frequency control, and more particularly relates to a method and system for tracking the resonance frequency of a linear oscillation motor based on a dual correlation algorithm. Background technique [0002] As a new type of motor, linear oscillating motor has broad application prospects in the field of refrigeration equipment. Compared with traditional rotary compressors, linear compressors driven by linear oscillating motors have many advantages, such as high efficiency, small size, simple structure, low noise and vibration, and flexible control. The working efficiency of a linear compressor is directly related to its working frequency. In order to give full play to the advantages of high working efficiency of a linear compressor, it is necessary to control its working frequency in real time. The mechanical motion model of the linear oscillating motor can be equivalent to a sec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P25/032H02P25/06H02P21/14H02P27/12
CPCH02P25/032H02P25/06H02P21/14H02P27/12
Inventor 徐伟宫逸凡王启哲廖凯举
Owner HUAZHONG UNIV OF SCI & TECH
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