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Permanent magnet synchronous motor initial position detection method based on high-frequency current signal injection

A permanent magnet synchronous motor, initial position detection technology, applied in the direction of motor generator control, electronic commutation motor control, control generator, etc., to achieve the effect of shortening the required time, simplifying the estimation process, and shortening the estimation time

Inactive Publication Date: 2015-05-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] According to the existing literature review, there is currently no article dedicated to the judgment of the positive direction of the d-axis in the pulse vibration high-frequency current injection method

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  • Permanent magnet synchronous motor initial position detection method based on high-frequency current signal injection
  • Permanent magnet synchronous motor initial position detection method based on high-frequency current signal injection
  • Permanent magnet synchronous motor initial position detection method based on high-frequency current signal injection

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Embodiment Construction

[0038]Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0039] like figure 1 As shown, the present invention provides a method for detecting the initial position of a surface-mounted permanent magnet synchronous motor, which specifically includes the following steps:

[0040] Step 1), establish a coordinate system relationship diagram, such as figure 2 As shown, d-q is the actual synchronous rotating coordinate system, In order to estimate the rotor synchronous rotating coordinate system, α-β is the actual two-phase stationary coordinate system, and define the estimated position error Among them, θ is the actual rotor initial position, is the final initial position estimate, The initial value of is 0.

[0041] Step 2), such as image 3 As shown, the q-axis current of the estimated rotor synchronous rotation coordinate system is given as 0, and the d-axis current is given as a pulse vibration h...

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Abstract

The invention discloses a permanent magnet synchronous motor initial position detection method based on high-frequency current signal injection. The method comprises the following step: on the basis of realizing estimation of an initial position by utilizing a fluctuating high frequency current injection method, carrying out d-axis positive direction judgment by extracting d-axis positive direction information included in double injection signal frequency sub-harmonics in d-axis voltage response. According to the method, only high frequency current signals need to be injected in the whole initial position estimation process, and extra signal injection in other forms such as square-wave pulse during the d-axis positive direction judgment process is not needed, so that the estimation time is shortened, and the estimation process is simplified.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for detecting the initial position of a permanent magnet synchronous motor based on high-frequency current signal injection. Background technique [0002] For the method of detecting the initial position of the surface-mounted permanent magnet synchronous motor rotor, since the motor rotor is stationary, the initial position of the rotor cannot be estimated by detecting the back EMF of the motor. High-frequency signal injection method. [0003] Liu Ying, Zhou Bo, Li Shuai, et al. Rotor initial position detection of surface-mounted permanent magnet synchronous motor[J]. Proceedings of the Chinese Society for Electrical Engineering, 2011, 31(18): 48-54. Estimation of rotor synchronous rotation coordinates The d-axis of the system injects a high-frequency sinusoidal voltage signal, detects the q-axis high-frequency current response and establishes a position estimation closed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 刘兵周波李洁王龙倪天恒
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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