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Flux linkage error observation-based acquisition method of full-order flux linkage observer of asynchronous motor without speed sensor

A technology without a speed sensor and a flux observer, which is applied in the direction of controlling generators, motor generators, and electromechanical brakes. It can solve the problems of large motor parameter errors, poor system operation stability, and full-order flux observer observation The problem of low accuracy

Active Publication Date: 2014-04-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that in the existing speed sensorless vector control system, when the motor is running at low speed, the observation accuracy of the full-order flux observer is low due to the large error of the motor parameters, which ultimately leads to poor system operation stability. The present invention Provides a method for obtaining a full-order flux observer without a speed sensor for an asynchronous motor based on observing the flux error

Method used

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  • Flux linkage error observation-based acquisition method of full-order flux linkage observer of asynchronous motor without speed sensor
  • Flux linkage error observation-based acquisition method of full-order flux linkage observer of asynchronous motor without speed sensor
  • Flux linkage error observation-based acquisition method of full-order flux linkage observer of asynchronous motor without speed sensor

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specific Embodiment approach 1

[0102] Specific implementation mode one: see figure 2 Describe this embodiment, the acquisition method of the full-order flux observer of the asynchronous motor without speed sensor based on the observation of flux linkage error described in this embodiment, this method is realized based on the existing full-order flux observer, the The method includes the following steps,

[0103] Step 1. When the following 3 conditions are met, obtain 4 error feedback coefficients, and the 4 error feedback coefficients are g 1 , g 2 , g 3 and g 4 , Substituting the obtained 4 error feedback coefficients into

[0104] G = g 1 - g 2 g 3 ...

specific Embodiment approach 2

[0138] Specific implementation mode two: see figure 1 Describe this embodiment. The difference between this embodiment and the acquisition method of a full-order flux observer without a speed sensor for an asynchronous motor based on the observed flux error in the first embodiment is that in the second step, according to the Know the rotational speed adaptive law equation:

[0139] ω ^ r = k 1 ( e iα λ ^ rβ - e iβ λ ^ rα ) - k 2 ( e λα λ ^ ...

specific Embodiment approach 3

[0168] Specific implementation mode three: see image 3 This embodiment is described. The difference between this embodiment and the acquisition method of a full-order flux observer for an asynchronous motor without a speed sensor based on the observed flux error described in the first embodiment is that the above-mentioned existing full-order flux The chain observer includes Α, B, C, G, 1 / s, speed adaptive rate, angle calculation module, an adder and two subtractors, the described A represents the full-order flux linkage observation matrix, and B represents the voltage input Matrix, C represents the current output matrix, 1 / s represents the integral operation,

[0169] The adder is used to sum the output voltage signal of B, the observation signal of A output and the error compensation signal of G output to obtain the rotor flux linkage differential signal,

[0170] 1 / s is used to perform an integral operation on the differential signal of the rotor flux linkage output by the...

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Abstract

The invention discloses a flux linkage error observation-based acquisition method of a full-order flux linkage observer of an asynchronous motor without a speed sensor and belongs to the field of a speed sensorless vector control full-order flux linkage observer. The problem that the existing speed sensorless vector control system causes low observation accuracy of the full-order flux linkage observer due to larger errors of motor parameters when a motor runs at low speed, and finally, the running stability of the system is poor is solved. A full-order flux linkage observer error feedback matrix coefficient is obtained according to the following rules, namely, the pole real part of the observer is smaller than the pole real part of an asynchronous motor, the real parts are both negative numbers, the zero pole real parts of an estimation rotation speed and a transfer function are both negative numbers, the error between an estimation flux linkage and a real flux linkage is utilized, when the motor runs at low speed, the equivalence of the system is a current model, and when the motor runs at high speed, the equivalence of the system is a voltage model. The rotor flux linkage phase position error coefficient ilambda is utilized and the rotor flux linkage amplitude error coefficient k is introduced, so that the estimation rotating speed precision is increased. The flux linkage error observation-based acquisition method of the full-order flux linkage observer of the asynchronous motor without the speed sensor is particularly used in the field of speed sensorless vector control.

Description

technical field [0001] The invention belongs to the field of a speed sensorless vector control full-order flux linkage observer. Background technique [0002] Asynchronous motor vector control technology can realize the decoupling of torque and flux linkage, and has good dynamic characteristics and steady-state characteristics, so it has been widely used in industrial systems. In many industrial occasions, motors are required to run stably in low-speed areas, such as hoists, winches, excavators, etc., but because the speed sensors required for control are expensive and easily damaged, the reliability of the speed control system is reduced. Increased maintenance costs. However, when the speed sensorless vector control system is running at low speed, due to the large error of the motor parameters, it is easy to cause the system to run unstable. To sum up, in order to avoid the use of speed sensors and enhance the service life of the system, it is necessary to study the low-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/13H02P21/04
Inventor 徐殿国孙伟于泳王勃
Owner HARBIN INST OF TECH
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