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Method for identifying asynchronous motor parameters offline under stationary state

A technology of asynchronous motor and static state, applied in the field of motor parameter identification, can solve problems such as poor practicability and inaccurate detection accuracy

Active Publication Date: 2013-07-17
三垦力达电气(江阴)有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an off-line parameter identification method in the static state of the motor for the problems of poor practicability and inaccurate detection accuracy in the existing asynchronous motor parameter identification method

Method used

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  • Method for identifying asynchronous motor parameters offline under stationary state
  • Method for identifying asynchronous motor parameters offline under stationary state
  • Method for identifying asynchronous motor parameters offline under stationary state

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Embodiment Construction

[0060] The following is based on figure 1 The T-type equivalent circuit of the motor shown and combined Figure 2-6 The technical solution of the present invention is described in detail as follows.

[0061] The offline parameter identification method of the motor in a stationary state of the present invention is mainly used to calculate the internal parameters of the motor. The method is based on the motor and the inverter connected to the input of the motor. The inverter is mainly used to output motor control signals and The voltage and current response signals of the stator windings of the motor are detected. The asynchronous motor includes a stator and a rotor, and the stator has windings. Specifically, the method of the present invention mainly includes calculating stator resistance, stator leakage inductance, rotor resistance, rotor leakage inductance, and stator-rotor mutual inductance. The specific steps of the method are as follows;

[0062] Step 1: Apply DC voltage excit...

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Abstract

The invention provides a method for identifying asynchronous motor parameters offline under a stationary state. The method comprises the steps of firstly, identifying a stator resistance value of a motor by using a direct current voltammetry; and then taking a single-phase rated-frequency alternating voltage and a single-phase low-frequency alternating voltage as an excitation source respectively to perform a single-phase alternating current test, obtaining steady-state response currents of the motor through detection, and obtaining a motor stator leakage inductance, a rotor inductance, a rotor resistance and a stator-rotor mutual inductance value through calculation. According to the method, calculation is performed in strict accordance with a motor classic equivalent circuit model, the accuracy is high, additionally, the condition that a reference voltage output by a motor controller is not accordant with the actual voltage and effects of the skin effect are further considered, corresponding compensation measures are taken, and the parameter identifying accuracy is further improved.

Description

Technical field [0001] The design of the present invention relates to a motor parameter identification technology, in particular to an off-line identification method of asynchronous motor parameters in a static state. Background technique [0002] In induction motor vector control systems, especially non-PG (rotary encoder) vector control or direct torque control systems, motor parameters play a very important role. The accuracy of motor parameters directly affects key links such as flux observation, speed estimation, and control parameter adjustment. The motor parameters required in vector control cannot be queried on the motor nameplate. Even if some motor parameters are calculated according to the data in the motor product manual, there is usually a large deviation from the actual data. Therefore, motor parameter identification has always been a very important topic in the field of motor control. [0003] Motor parameter identification includes two parts: offline parameter ide...

Claims

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Application Information

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IPC IPC(8): H02P23/14
Inventor 沙友涛
Owner 三垦力达电气(江阴)有限公司
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