Speed-sensor-less construction method for bearing-less asynchronous motor

A speed sensorless, asynchronous motor technology, applied in the control of generators, motor-generators, and electromechanical brakes, etc., can solve the problems of small local poles of neural networks, affecting control performance, and over-learning, and achieve strong generalization capabilities. and adaptive ability, easy engineering implementation, low cost effect

Inactive Publication Date: 2012-08-08
JIANGSU UNIV
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Problems solved by technology

These speed identification methods do not consider the influence of factors such as rotor eccentricity, magnetic saturation, temperature rise, and load changes during high-speed operation, and have not really realized accurate online identification of speed parameters.
The speed sensorless method based on the neural network inverse system uses the powerful approximation ab

Method used

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  • Speed-sensor-less construction method for bearing-less asynchronous motor
  • Speed-sensor-less construction method for bearing-less asynchronous motor
  • Speed-sensor-less construction method for bearing-less asynchronous motor

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Embodiment Construction

[0014] see Figure 4 , the present invention first establishes the mathematical model of the internal speed subsystem 12 based on the mathematical model of the original system 11 of the bearingless asynchronous motor. The variable constraint relationship determined by the model; then the inverse model containing the speed subsystem 12 is established, that is, the bearingless asynchronous motor speed left inverse system 2; and then the support vector machine 31 with 7 input nodes and 1 output node and 2 The differentiator S constitutes the SVM inverse 32 with 5 input nodes and 1 output node containing the rotational speed subsystem 12; and by adjusting the vector coefficients and thresholds of the SVM 31, the SVM inverse 32 realizes bearingless The function of the asynchronous motor speed left inversion system 2; finally, the support vector machine inverse 32 is connected in series with the original system 11 of the bearingless asynchronous motor to form a speed sensor, which c...

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Abstract

The invention discloses a speed-sensor-less construction method for a bearing-less asynchronous motor, which comprises the following steps of: firstly, constructing an embedded rotating speed subsystem for an original bearingless asynchronous motor system; then, establishing a bearingless asynchronous motor rotating speed left-inverse system of the embedded rotating speed subsystem; subsequently, adopting a static neural network and two differentiators S to form a support vector machine inverse, training the support vector machine, and adjusting and determining all weight coefficients of the support vector machine so as to realize the bearing-less asynchronous motor rotating speed left-inverse system; and finally, inversely connecting the support vector machine behind the original bearing-less asynchronous motor system in series so as to finish the speed-sensor-less construction. The speed-sensor-less control strategy of the bearing-less asynchronous motor based on support vector machine left-inverse omits a mechanical speed sensor and an interface circuit thereof of the original control system, so that the cost of the control system is lowered, and rotating speed identification can be quickly and accurately carried out in the full-speed range. The speed-sensor-less construction method for a bearing-less asynchronous motor has strong adaptability, fault tolerance and robustness.

Description

technical field [0001] The invention is a construction method of a bearingless asynchronous motor without a speed sensor based on the left inverse of a support vector machine, which provides a new control strategy for the speedless operation of a bearingless asynchronous motor, and is suitable for high-performance control of a bearingless asynchronous motor. It belongs to the technical field of electric drive control equipment. Background technique [0002] The high-performance control of a bearingless asynchronous motor is inseparable from the closed-loop control of the speed, so it is necessary to detect the speed of the rotor. The traditional motor rotor speed is detected by a mechanical speed sensor, which has problems such as installation, connection and reliability. For bearingless asynchronous motors, the use of mechanical speed sensors has greater limitations, because the sensor itself is mechanically difficult to achieve high-speed and ultra-high-speed operation of ...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P21/18
Inventor 杨泽斌孙晓东李可黄振跃张新华
Owner JIANGSU UNIV
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