Asynchronous machine stator flux estimation system based on current model and method

A stator flux and current model technology, applied in control systems, control generators, vector control systems, etc., can solve problems such as large phase errors

Active Publication Date: 2015-02-18
SUZHOU INOVANCE TECH CO LTD
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Problems solved by technology

[0025] 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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  • Asynchronous machine stator flux estimation system based on current model and method
  • Asynchronous machine stator flux estimation system based on current model and method
  • Asynchronous machine stator flux estimation system based on current model and method

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Embodiment Construction

[0048] 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.

[0049] like 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 , and a stator magnetic flux calculation unit 25 . The above-mentioned current sampling unit 31, stator voltage sampling unit 22, motor speed sampling unit 23, coordinate transformation unit 24, and stator flux calculat...

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Abstract

The invention provides an asynchronous machine stator flux estimation system based on a current model and a method. The system comprises a stator current sampling unit, a stator voltage sampling unit, a motor speed sampling unit, a coordinate conversion unit and a stator flux calculating unit, wherein the stator current sampling unit, the stator voltage sampling unit and the motor speed sampling unit are respectively used for sampling stator three-phase current, voltage and motor rotor speed of a three-phase motor; the coordinate conversion unit is used for converting the stator three-phase current and the stator three-phase voltage obtained through sampling into stator current and stator voltage of an axis alpha and an axis beta; and the stator flux calculating unit is used for calculating stator flux amplitude of the motor according to the stator current and the stator voltage of the axis alpha and the axis beta and the motor rotor speed. The invention also provides a corresponding method. The system obtains good stator flux estimation effect by decoupling cross coupling items estimated through stator flux of the axis alpha and the axis beta in a static coordinate system.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a current model-based stator magnetic flux estimation system and method for an asynchronous machine. 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 control of ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P25/02
Inventor 何俊辉
Owner SUZHOU INOVANCE TECH CO LTD
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