Dead zone compensation method for space vector pulse width modulation output based on equivalent vector effect

A space vector pulse width, dead zone compensation technology, applied in the field of AC servo, can solve the problems of complex dead zone compensation methods, etc., to achieve the effect of improving the effect

CN101964597AActive Publication Date: 2011-02-02东元总合科技(杭州)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2011-02-02

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Abstract

The invention discloses a dead zone compensation method for space vector pulse width modulation output based on equivalent vector effect which can effectively avoid output voltage distortion, and is characterized by simple algorithm and strong universality in order to solve the problem that the dead zone compensation method is complicated when space vector pulse width modulation output is employed in the prior art. The compensation method takes the dead zone effect equivalent to the effect of a basic space vector through judging the current direction of each bridge-arm switch device of an inverter and offsets the dead zone effect through increasing or decreasing the non-zero basic space vector action time of a sector area where the modulation vector stays to efficiently realize the dead zone compensation for the space vector pulse width modulation output so as to greatly improve the low-speed control effects.
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Description

technical field

[0001] The invention relates to the field of AC servo technology, more specifically, to a dead zone compensation method based on a space vector pulse width modulation output with equivalent vector action. Background technique

[0002] As one of the main driving sources of modern industrial production, AC servo system is the basic technology of modern industrial production. AC servo system, an automatic control system that plays an important role in supporting technology, has been widely used in many high-tech fields, such as laser processing, robots, CNC machine tools, large-scale integrated circuit manufacturing, office automation equipment, radar and various A military weapon servo system, and a flexible manufacturing system.

[0003] In a modern all-digital AC servo system, the permanent magnet synchronous motor is generally controlled by driving a voltage source inverter through PWM (pulse width modulation) technology. In the inverter, in order to avoid...

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Embodiment Construction

[0025] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0026] The gist of the present invention is to provide a method that can effectively avoid output voltage distortion and has a simple algorithm and strong versatility for the problem that the dead zone compensation method is relatively complicated when using Space Vector Pulse Width Modulation (SVPWM) output in an AC servo system. A dead-zone compensation method based on vector action equivalent space vector pulse width modulation output.

[0027] The present invention is based on the voltage compensation method of the space vector pulse width modulation output equivalent to the vector action. Before the compensation, the direction of the three-phase current of the permanent magnet synchronous motor needs to be determined first. When the directi...