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Method for identifying on-line parameters of linear induction motor

A linear induction motor and parameter identification technology, applied in the field of online identification, can solve the problems of complex calculation, large error of motor parameter and motor voltage measurement, etc.

Active Publication Date: 2010-04-14
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art such as complex calculation, dependence on other motor parameters that are difficult to accurately grasp online, and large motor voltage measurement errors, and propose an online identification method for the secondary time constant of a linear induction motor

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  • Method for identifying on-line parameters of linear induction motor
  • Method for identifying on-line parameters of linear induction motor
  • Method for identifying on-line parameters of linear induction motor

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] The present invention is based on the following principles:

[0022] The steady-state phasor diagram of the linear induction motor in the secondary field-oriented mode is as follows: figure 1 shown. Define the primary current angle γ, and arctanγ=I q1 / I d1 , where I q1 is the primary thrust current component, I d1 is the primary excitation current component. Define the motor secondary circuit impedance angle φ 2 ,and ω sl Slip frequency, L 2 Secondary inductance, R 2 secondary resistance.

[0023] Since the primary current phasor I dqs The induced potential in the secondary loop is -jω sl L m I dq1 , the spatial lag current phasor is 90 degrees, j is a complex operator, L m is the magnetizing inductance of the motor, I dq1 is the primary steady-state current phasor. when satisfied relationship, that is, to maintain ...

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Abstract

The invention relates to a method for identifying on-line parameters of a linear induction motor, which realizes the closed-loop control of exciting current component and thrust current component of a motor and enables the exciting current component to be equal to the thrust current component under the directional control of an indirect magnetic field. The method comprises the following steps: adjusting a secondary time constant value used in a motor controller and changing the specified slip frequency and the synchronous frequency of the motor in the controller by an on-line identification arithmetic to adjust the synchronous angle for the magnetic field to locate; searching the minimum value of the input current of the motor in a steady-state operation condition when the load torque is kept constant, enabling the secondary time constant used in the motor controller to be approximate to the real value of the secondary time constant of the motor, therefore realizing the on-line identification of the secondary time constant of the motor. The invention can realize the correct directional control of the indirect magnetic field of the linear induction motor without depending on other motor parameters hard to be controlled exactly through on-line operation, avoid influence of end effect, parameter change and the like on the control performance, does not need the input voltage component of the motor and improves the practicability of a parameter on-line identification system.

Description

technical field [0001] The invention mainly relates to the field of linear induction motor control, and proposes an online identification method for the secondary time constant of the motor. This method can also be applied to the online identification control algorithm of the rotating induction motor. Background technique [0002] The linear induction motor is a widely used linear motor that can directly generate linear mechanical motion. However, due to the special structure, there are edge effects, and the motor parameters change during operation, resulting in inaccurate magnetic field orientation and poor control effect. It is necessary to grasp the motor parameters in real time through online identification. Z.R. Zhang et al. proposed an online parameter identification algorithm for linear induction motors in the literature LIM dynamic performance assessment from parameter identification. (IEEE Industry applicationssociety annual meeting, Vol.1, Aug, 1993: 295-300.) Pe...

Claims

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Application Information

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IPC IPC(8): H02P27/06H02P21/14H02P21/16
Inventor 任晋旗李耀华葛琼璇王珂张瑞华陈峻岭
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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