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An Observation Method of Induction Motor Rotor Flux Linkage

A rotor flux linkage and induction motor technology, applied in the estimation/correction of motor parameters, control of generators, observer control, etc., can solve the problems of low accuracy of flux linkage observation, large discretization error, etc., and achieve easy digital realization , low complexity, simple effect achieved by digitization

Active Publication Date: 2022-03-08
HARBIN KEJIA GENERAL MECHANICAL & ELECTRICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0051] The present invention aims to solve the problem that the discretization error of the existing flux linkage observer is large, resulting in low accuracy of flux linkage observation, and now provides a method for observing the flux linkage of an induction motor rotor

Method used

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  • An Observation Method of Induction Motor Rotor Flux Linkage
  • An Observation Method of Induction Motor Rotor Flux Linkage
  • An Observation Method of Induction Motor Rotor Flux Linkage

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specific Embodiment approach 1

[0091] Specific embodiment one: a method for observing the flux linkage of an induction motor rotor described in this embodiment,

[0092] First, the stator current of the induction motor is collected, and the rotor flux observer is established; then, the rotor flux observer is discretized by the improved Euler method, and the observed values ​​are obtained according to the discretized rotor flux observer. The improved Euler method is a combined discretization method of forward Euler method and trapezoidal discretization method. The observed values ​​are used to control the induction motor.

[0093] Under the condition that the motor accelerates stepwise from 0 speed to the rated speed of 50Hz, the observation results of the induction motor rotor flux linkage based on the forward Euler method and the improved Euler method are compared, as shown in figure 2 with 3 shown. It can be seen from the two figures that the improved Euler discretization method can achieve accurate o...

specific Embodiment approach 2

[0095] Specific embodiment two: This embodiment is to further explain the observation method of a kind of induction motor rotor flux linkage described in specific embodiment one. In this embodiment, the rotor flux observer is the rotor of the induction motor under the αβ coordinate system Flux current model.

specific Embodiment approach 3

[0096] Specific embodiment three: this embodiment is to further explain the observation method of the rotor flux linkage of an induction motor described in specific embodiment one. In this embodiment, the differential expression of the rotor flux observer is as follows:

[0097]

[0098] in, B=λL m , ω r is the angular velocity of the rotor, L m is the mutual inductance, R r is the rotor resistance, L r is the rotor inductance, x is the flux linkage, is the observed value of flux linkage, i s Is the stator current, t is the time.

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Abstract

The invention discloses a method for observing the flux linkage of an induction motor rotor, which relates to the technical field of motor control. The invention aims to solve the problem that the discretization error is large and the accuracy of the flux linkage observation is low when the conventional flux linkage observer is discretized. The method for observing the rotor flux linkage of an induction motor according to the present invention collects the stator current of the induction motor, establishes a rotor flux observer, uses the improved Euler method to discretize the rotor flux observer and obtains observation values, the described The observed values ​​are used to control the induction motor, and the improved Euler method is a combined discretization method of the forward Euler method and the trapezoidal discretization method. The invention is suitable for the observation part of the rotor flux linkage in the induction motor control, so as to improve the accuracy of the flux linkage observation.

Description

technical field [0001] The invention belongs to the technical field of motor control. Background technique [0002] Induction motors are widely used in variable frequency speed control systems due to their simple structure, strong durability, high reliability and low cost. Flux linkage is the magnetic flux linked by conductive coils or current loops. Since the high-precision control process of the induction motor is inseparable from the control of the flux linkage, obtaining high-precision flux linkage information is a crucial link in the induction motor control. [0003] In an actual induction motor digital drive system, the rotor flux observation current model (continuous domain) in the induction motor αβ coordinate system is as follows: [0004] [0005] In the formula, with Respectively represent the observed values ​​of the rotor α-axis and β-axis flux linkage, ω r Indicates the motor speed, i sα and i sβ Respectively represent the stator α-axis and β-axis c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P23/14H02P23/12H02P21/14H02P21/13
Inventor 董蕊
Owner HARBIN KEJIA GENERAL MECHANICAL & ELECTRICAL CO LTD
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