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Speed observation method of linear induction motor

A linear induction motor, observation equation technology, applied in the control of generators, motor generator control, electronic commutation motor control and other directions, can solve the problems of changing motor parameters, reducing the overall efficiency of the motor, etc., to improve accuracy, reduce edge the effect of the effect

Active Publication Date: 2019-03-01
深圳市深信创联智能科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unlike rotary induction motors, since the structure is not closed, there is an edge effect in the linear induction motor, which will reduce the overall efficiency of the motor and change the parameters of the motor

Method used

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  • Speed observation method of linear induction motor
  • Speed observation method of linear induction motor
  • Speed observation method of linear induction motor

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Experimental program
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Embodiment approach

[0023] As an implementation, the flux linkage observation equation of the voltage model is:

[0024]

[0025]

[0026] The flux linkage observation equation of the current model is:

[0027]

[0028]

[0029] in L' m =[1-f(Q)]L m , L s '=L' m +L ls , L r '=L' m +L lr , f(Q)=(1-e -Q ) / Q, Q=T v / T r =DR r / (L m +L lr )v,L m is the stator-rotor mutual inductance, L ls is the stator inductance, L lr is the rotor inductance (secondary leakage inductance), R r is the rotor resistance, R s Is the stator resistance, D is a constant.

[0030] The embodiment of the present invention is different from the traditional MRAS method applied to the rotary induction motor. The embodiment of the present invention is based on the MRAS speed observation method, considers the edge effect of the linear induction motor, introduces the f(Q) factor, and quantifies the edge effect Impact. Since the realization of the system is discrete, let ω r k Time instant represe...

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Abstract

An embodiment of the invention discloses a speed observation method of a linear induction motor. The speed observation method comprises a first configuration step: a voltage model of the linear induction motor and a flux linkage observation equation corresponding to a current model are constructed on the basis of an MRAS speed observation method; a first rotating speed acquiring step: the observedrotating speed, a formula which is as shown in the specification, is acquired according to the output of the voltage model and the current model based on a rotating speed self-adaptation law; a second configuration step: a state observer is constructed on the basis of a luenberger observer to serve as an adjustable model of the linear induction motor, and the linear induction motor is used as a reference model; a second rotating speed acquiring step: the observed rotating speed, a formula which is as shown in the specification, is acquired according to the output of the adjustable model and the reference model based on calculation of the rotating speed self-adaptation law; and a calculation step: the final observation rotating speed omega is obtained through calculation according to the observed rotating speed, a formula which is as shown in the specification and the rotating speed a formula which is as shown in the specification. According to the method, the speed information of theobserved linear induction motor is acquired based on the MRAS method and the luenberger observer through the rotating speed self-adaptation law, the influence of the edge end effect is reduced, and then the precision of speed observation is improved.

Description

technical field [0001] The invention relates to the technical field of linear induction motors, in particular to a speed observation method of linear induction motors. Background technique [0002] Linear induction motors are often used in harsh working environments such as high temperature, high pressure, and humidity in the industry. It puts forward extremely high requirements on the environmental adaptability of the encoder. The scope of application is significant. However, unlike rotary induction motors, since the structure is not closed, there is an edge effect in the linear induction motor, which will reduce the overall efficiency of the motor and change the parameters of the motor. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present invention is to provide a speed observation method of a linear induction motor so as to reduce the influence of edge effects. [0004] In order to solve the above technical problems, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P21/13
CPCH02P21/13H02P21/18
Inventor 温鲜慧王爱玲代雨婷
Owner 深圳市深信创联智能科技有限责任公司
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