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On-phase method for alternating current servo system capable of overcoming friction force influence

A technology of AC servo and friction force, applied in the field of phase contrast, can solve the problem of not considering the influence of friction force, etc., and achieve the effect of improving the calculation accuracy

Active Publication Date: 2018-10-26
NANJING COLLEGE OF INFORMATION TECH
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  • Abstract
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Problems solved by technology

[0011] However, the existing alignment technology does not consider the influence of friction, and the process is carried out in the αβ coordinate system

Method used

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  • On-phase method for alternating current servo system capable of overcoming friction force influence
  • On-phase method for alternating current servo system capable of overcoming friction force influence
  • On-phase method for alternating current servo system capable of overcoming friction force influence

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Embodiment Construction

[0030] like Figure 5 and 6 As shown, the method for phase contrast of the AC servo system that overcomes the influence of the friction force disclosed by the present invention includes the following steps:

[0031] Step 1, establish the αβ coordinate system to compensate the influence of friction force, and set the magnetic pole N to be located above the α axis;

[0032] Step 2, start the phase comparison, the specific steps are:

[0033] Step 2.1, Setup Start SVPWM, the magnetic pole rotates clockwise from the initial position, and reaches the position where the magnetic pole N just passes the positive half-axis of the α-axis, that is Figure 5 The position shown in the figure in (1), where U N is the voltage corresponding to the rated current of the motor, t is the time variable of the rotation in this step, and its value range is 0≤t≤T 1 , T 1 is the duration of rotation for this step;

[0034] Step 2.2, Setup Start SVPWM, the magnetic pole rotates counterclockwise...

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Abstract

The invention provides an on-phase method for an alternating current servo system capable of overcoming friction force influence. The on-phase method comprises the following steps: establishing an on-phase coordinate system alpha beta coordinate system for compensating the friction force influence, and setting an on-phase front magnetic pole N to be positioned above alpha axis; and recording the reading of a position encoder by using rotations in different rotation directions, so that an ideal on-phase position x0 for compensating the friction force influence is calculated. According to the on-phase method for the alternating current servo system capable of overcoming the friction force influence, by using a twice on-phase method, the influence of friction force is compensated, and the defects of an existing on-phase technology are recovered.

Description

technical field [0001] The invention relates to a phase contrast method, in particular to a phase contrast method of an AC servo system which overcomes the influence of frictional force. Background technique [0002] Phase reversal is a debugging step before the AC servo system leaves the factory. The purpose is to make the servo accurately obtain the magnetic pole position of the motor rotor at the beginning of normal operation. The current phase-to-phase technology adopted by servo manufacturers ignores the influence of friction, and the servo driver using this existing technology cannot accurately obtain the initial position of the magnetic pole of the motor during operation, thus affecting the overall running performance of the servo. In the vector control scheme of the AC servo system, the actual currents of the two channels of the d-axis and the q-axis in the current loop are transformed from the actual phase currents through CLARK and PARK. The mathematical expression...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18
CPCH02P21/18
Inventor 扶文树储建华赵海峰王刚
Owner NANJING COLLEGE OF INFORMATION TECH
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