Dead zone compensating method for space vector pulse width modulating output

Abstract

This invention relates to a dead zone compensation method for SVPWM output including: taking an expected value of the output three-phase voltage of a magnet synchronous motor as the pulse width expected value output by modulation of three bridge arm pulse width of an inverter, taking the combined value of the expected values of the pulse width output by the modulation of U, V and W as the voltage space vector output expected value of the inverter of an AC servo system, taking the designed dead zone time of the output pulse modulation as the expected value of the dead zone compensation time and utilizing the polarity of each output phase current of a magnet synchronous motor, the expected value of the voltage space vector and that of the dead zone compensation time to compute the acting time of each voltage space vector.

Description

technical field [0001] The invention belongs to the field of AC servo technology, and in particular provides a dead zone compensation method based on space vector pulse width modulation (SVPWM) output, which eliminates the dead zone through compensation of the SVPWM (Space Vector Pulse Width Modulation) output of the AC servo system The torque ripple of the AC servo system can improve the low-speed performance of the AC servo system. 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. In a modern all-...

AI Technical Summary

Problems solved by technology

A basic control principle of the voltage source inverter is that the device to be turned on should lag behind the device to be turned off by a dead time T d In order to prevent the straight-through of the upper and lower bridge arms (see Figure 7 and Figure 8), this will cause the dead zone effect of the AC servo system

For the AC servo system, the direct impact of the dead zone effect is the torque ripple output by the permanent magnet synchronous motor. Due to the existence of the torque ripple, the low-speed performance of the AC servo system is not good, which is manifested as a sense of stepping or pulse vibration in the output. In addition, this also makes the minimum speed of the system output cannot be guaranteed

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