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System and method for estimating magnetic flow of asynchronous machine based on current model

A current model, asynchronous machine technology, applied in control systems, control generators, vector control systems, etc., can solve problems such as increasing phase error

Active Publication Date: 2012-12-12
SUZHOU INOVANCE TECH CO LTD
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Problems solved by technology

[0021] The technical problem to be solved by the present invention is to provide a system and method for estimating the magnetic flux of an asynchronous machine based on a current model in view of the above-mentioned problem that the phase error increases with the increase of the motor rotor speed in the magnetic flux estimation

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  • System and method for estimating magnetic flow of asynchronous machine based on current model
  • System and method for estimating magnetic flow of asynchronous machine based on current model
  • System and method for estimating magnetic flow of asynchronous machine based on current model

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[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0045] Such as figure 2 Shown is a schematic diagram of an embodiment of the current model-based magnetic flux estimation system for asynchronous machines of the present invention. In this embodiment, the magnetic flux estimation system includes a stator current sampling unit 31 , a stator voltage sampling unit 22 , a motor speed sampling unit 23 , a coordinate transformation unit 24 , a magnetic flux calculation unit 25 and a motor control unit 26 . The above-mentioned current sampling unit 31, stator voltage sampling unit 22, motor speed sampling unit 23, coordinate transformation unit 24, magn...

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Abstract

The invention provides a system for estimating the magnetic flow of an asynchronous machine based on a current model. The system comprises a stator current sampling unit, a stator voltage sampling unit, a motor rotation speed sampling unit, a coordinate converting unit, a magnetic flow calculating unit and a motor control unit, wherein the stator current sampling unit, the stator voltage sampling unit and the motor rotation speed sampling unit are respectively used for sampling stator three-phase current and stator three-phase voltage of a three-phase motor, and motor rotor rotation speed; the coordinate converting unit is used for converting the obtained stator three-phase current and the stator three-phase voltage to obtain stator current and stator voltage of alpha axis and beta axis; and the magnetic flow calculating unit is used for calculating magnetic flow amplitude and magnetic filed synchronizing angle of the motor according to the stator current and the stator voltage of the alpha axis and the beta axis, and the motor rotor rotation speed. The invention also provides a corresponding method. A good magnetic flow estimating effect is achieved by de-coupling the cross coupling item of magnetic flow estimation of the alpha axis and the beta axis in a static coordinate system.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a system and method for estimating the magnetic flux of an asynchronous machine based on a current model. Background technique [0002] Asynchronous machine vector control technology includes vector control with speed sensor and vector control without speed sensor. In the vector control mode with speed sensor, in order to achieve good torque control linearity and torque control accuracy, closed-loop control of magnetic flux is usually required, and the magnetic flux amplitude feedback is usually obtained by magnetic flux estimation. In the vector control mode without a speed sensor, in order to obtain the magnetic field control angle or perform speed estimation, it is also necessary to estimate the current flux angle of the motor, which is usually obtained through flux estimation. [0003] It can be seen that the high-precision flux estimation is very important for the vector contro...

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Application Information

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IPC IPC(8): H02P21/14H02P21/16
Inventor 何俊辉
Owner SUZHOU INOVANCE TECH CO LTD
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