Flux weakening control method based on observation compensation and coupling adjustment
A technology of coupling adjustment and field weakening control, applied in observer control, general control strategy, estimation/correction of motor parameters, etc. To achieve the effect of good dynamic performance, simple form and easy realization
Active Publication Date: 2017-02-22
SOUTHEAST UNIV
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Problems solved by technology
In addition, when adjusting the direct-axis current, there is still a strong coupling problem between the quadrature axis and the direct axis. However, the traditional single current loop adjustment algorithm still uses PI control for the direct-axis current, which is difficult to solve such a strong coupling problem. The dynamic performance of the algorithm is not satisfactory
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[0034] The present invention will be further described below in conjunction with the accompanying drawings.
[0035] The present invention is a field-weakening control method for a servo motor, specifically a field-weakening control method based on observation compensation and coupling adjustment. The steps are as follows: figure 1 As shown, the specific steps are as follows:
[0036] Step 1: The field-weakening enable judgment unit first obtains the field-weakening limit voltage u according to the DC bus voltage smax , and then compare the field weakening limit voltage with the motor terminal voltage u s the size of. if u s ≤u smax , then the field weakening is enabled and enters step 2; if u s > u smax , the field weakening is not enabled, use i d = 0 algorithm.
[0037] Step 2: Direct-axis coupling observation unit, design direct-axis coupling observation algorithm according to the direct-axis voltage equation, and estimate the direct-axis disturbance
[0038] S...
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The invention discloses a flux weakening control method based on observation compensation and coupling adjustment and is suitable for flux weakening control of a servo motor. Aiming at the technical difficulty of strong coupling of a quadrature and direct axis current equation of the servo motor, the flux weakening control method is characterized by comprising the following technical scheme divided into four steps: firstly, judging flux weakening enabled property by comparing the flux weakening limit voltage and the motor terminal voltage; secondly, estimating out the direct-axial disturbance through a direct-axis coupling observation unit if the flux weakening enabled property is judged; then, obtaining the direct-axis voltage through a direct-axis voltage generation unit if the flux weakening enabled property is judged; finally, obtaining quadrature-axis voltage through a quadrature-axis voltage generation unit if the flux weakening enabled property is judged. The flux weakening control method is simple in form and easy to implement, can improve the insufficient dynamic property in the prior art and effectively improves the flux weakening control dynamic property of the servo motor.
Description
technical field [0001] The invention belongs to the technical field of electromechanical control, in particular to a motor field weakening control method based on observation compensation and coupling adjustment. Background technique [0002] With the rapid development of power electronics technology, microelectronics technology and modern control theory, servo motors have been widely concerned and applied in various industries, especially the control precision requirements of machinery manufacturing, robot industry, metallurgy, numerical control and aerospace. higher areas. In recent years, with the continuous development of permanent magnet materials, the demagnetization ability of permanent magnets has been further strengthened, laying a foundation for the further development of servo motor field weakening control; CNC processing equipment, industrial robots and other applications, in order to pursue higher The working efficiency of the servo motor requires that the serv...
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IPC IPC(8): H02P23/14H02P23/12
CPCH02P23/0004H02P23/12H02P23/14
Inventor 李世华吴超李奇杨俊崔宏宇王翔宇
Owner SOUTHEAST UNIV