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Design method for weak magnetic controller of induction motor based on simplification of voltage loop structure

A technology for induction motors and magnetic controllers, applied in motor generator control, electronically commutated motor control, electromechanical brake control, etc., can solve problems such as system oscillation and instability, and achieve reduced current ripple and voltage loop bandwidth Constant, avoiding the effect of system shock or even instability

Active Publication Date: 2019-10-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the parameter selection of the field weakening controller based on the voltage closed loop is limited to the trial and error method, and the improper selection of the field weakening controller parameters will cause the system to oscillate or even become unstable. Design Method of Induction Motor Field Weakening Controller with Simplified Voltage Loop Structure

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  • Design method for weak magnetic controller of induction motor based on simplification of voltage loop structure
  • Design method for weak magnetic controller of induction motor based on simplification of voltage loop structure
  • Design method for weak magnetic controller of induction motor based on simplification of voltage loop structure

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specific Embodiment approach 1

[0029] Specific Embodiment 1: The design method of the induction motor field weakening controller based on the simplification of the voltage loop structure described in this embodiment, the method includes the following steps:

[0030] Step 1. Resetting the voltage reference and voltage feedback in the induction motor field weakening control model based on voltage closed loop; according to the reset voltage reference and voltage feedback, an improved induction motor field weakening control model based on voltage closed loop is obtained;

[0031] In the improved field-weakening control model of induction motor based on voltage closed-loop, the influence of q-axis voltage command u is analyzed sq * signal to obtain the structural model of the voltage closed loop I;

[0032] In the improved field-weakening control model of induction motors based on voltage closed-loop, the analysis of the influence of the d-axis voltage command u sd * The signal of the voltage closed-loop II s...

specific Embodiment approach 2

[0061] Embodiment 2: The difference between this embodiment and Embodiment 1 is that: the voltage setting and voltage feedback in the induction motor flux-weakening control model based on the voltage closed loop are reset; according to the reset voltage setting and voltage feedback , to obtain an improved induction motor flux-weakening control model based on voltage closed-loop, which is specifically:

[0062] Reset the voltage reference of the induction motor field weakening control model based on the voltage closed loop to u sq,ref * ,in: where u sq,ref * is the given field weakening voltage, u sd * is the d-axis voltage command output by the complex vector current regulator, u max It is given for the original excitation voltage of the induction motor field weakening control model based on the voltage closed loop, that is, the maximum voltage value allowed by the system operation;

[0063] Resetting the voltage feedback for the voltage closed-loop based induction mot...

specific Embodiment approach 3

[0069] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in Step 1, in the improved induction motor flux-weakening control model based on voltage closed-loop, the influence of the q-axis voltage command u is analyzed. sq * signal to obtain the structural model of the voltage closed-loop I; in the improved induction motor flux-weakening control model based on the voltage closed-loop, analyze the influence of the d-axis voltage command u sd * The signal of the voltage closed-loop II structure model is obtained; specifically:

[0070] In the improved induction motor field weakening control model based on voltage closed loop, such as image 3 As shown, the analysis affects the output voltage command signal u of the complex vector current regulator sq * There are: Back EMF term u sq,EMF , d-axis current error Δi sd Through the coupling term of the complex vector current regulator, the q-axis current error Δi sq Through the proportional-integr...

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Abstract

The invention relates to a design method for a weak magnetic controller of an induction motor based on simplification of a voltage loop structure, belongs to the technical field of motor control, andsolves the problems that parameter selection of the voltage closed loop based weak magnetic controller is limited to a trial and error procedure and improper parameter selection may cause oscillationeven instability of the system. According to the method, voltage giving and voltage feedback are reset; a control structure of first and second voltage closed loops is selected from a voltage closed loop based weak magnetic control system structure according to signals influencing output voltage instructions usq* and usd* of a current regulator, and the control structure of the first and second voltage closed loops is simplified; and the weak magnetic controller is set as a PI structure, and system response is corrected via a low band correction principal. The method can be applied to design of the weak magnetic controller of the induction motor.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a design method of a field-weakening controller of an induction motor based on a simplified voltage loop structure. Background technique [0002] High-end industrial applications require high precision, high efficiency, and high quality, prompting the development of motor drive systems in the direction of high speed. Induction motors are widely used for their price advantage, high reliability, wide speed range and good overload capacity. At present, the high-speed induction motor frequency conversion drive has been applied in electric vehicles, electric locomotives, compressors, CNC machine tool spindle drives, electric locomotives and other occasions. Taking CNC machine tools as an example, as the core component of the drive system, the performance of spindle drive control directly determines the overall level of CNC machine tools. The use of direct drive can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00
CPCH02P21/0089
Inventor 王勃张静于泳张旭徐殿国
Owner HARBIN INST OF TECH
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