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Method for estimating power factor of induction motor in any load state

A technology of power factor and induction motor, applied in the direction of design optimization/simulation, etc., can solve the problems of high equipment cost, difficulty in application, discontinuity, etc., and achieve the effect of improving robustness, high accuracy, and low prediction error

Pending Publication Date: 2021-09-03
青岛恒星智能装备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Real-time measurement can also be carried out by installing a power analyzer. The former is only discrete data, which is not continuous, and there are differences between different motors, so it is not accurate; the latter has high equipment costs and is difficult to apply in actual operating occasions.

Method used

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  • Method for estimating power factor of induction motor in any load state
  • Method for estimating power factor of induction motor in any load state
  • Method for estimating power factor of induction motor in any load state

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Embodiment Construction

[0054] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0055] Connect a power analyzer to the induction motor tested before leaving the factory, load different loads, and measure the voltage U, current I, active power P, and reactive power Q of the motor operating under different loads.

[0056] Calculate the power factor of the motor under different loads by the following formula:

[0057]

[0058] ...

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Abstract

The invention discloses a method for estimating a power factor of an induction motor in any load state, and relates to the technical field of motor parameter estimation. For the power factor of the three-phase induction motor under any load, the method comprises the steps: acquiring the data of the motor under different load states, obtaining a data set of the load rate and the power factor through calculation, obtaining a regression model for estimating the power factor through training after the data set is divided, performing verification, obtaining a final model through a lowest generalization error, and then carrying out the test verification. The power factor of the motor in any load state is accurately calculated through the power factor estimation model, and the adjustment of the induction motor capacitor bank is guided. The method is high in accuracy, and the power factor can be rapidly, economically and continuously obtained.

Description

technical field [0001] The invention relates to the technical field of motor parameter estimation, in particular to a method for estimating the power factor of an induction motor under any load state. Background technique [0002] The three-phase induction motor is an industrial power device with an inductive load. It is characterized in that the load is inductive when the load current lags behind the load voltage by a phase difference compared with the power supply. Because the phase difference between the current and the voltage can generate negative power, when the current and voltage are in the same phase again, the same amount of electric energy is needed to establish a magnetic field in the inductive load, so this energy exchange that converts power supply energy into magnetic field energy becomes "Reactive power". [0003] In the process of actually using induction motors, inductive loads always produce low power factor due to consuming more reactive power, which not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/27
CPCG06F30/27
Inventor 王伟华卜祥峰王梓涵杜艳秋
Owner 青岛恒星智能装备有限公司
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