Quick high-precision method for sampling analog quantity in alternating current speed regulating system of mine hoist

Abstract

The invention discloses a quick high-precision method for sampling the analog quantity in an alternating current speed regulating system of a mine hoist, belonging to a quick high-precision sampling method for a motor. The sampling method comprises a quick high-precision sampling circuit, wherein the circuit is provided with a module with a sigma-delta modulating function, an FPGA (Field Programmable Gate Array) for filtering and a DSP (Digital Signal Processor) for controlling, wherein the output of the module with the sigma-delta modulating function is a pulse stream Mdate and a high-frequency sampling clock input signal Mclk; the pulse stream Mdate and the high-frequency sampling clock input signal Mclk are used as inputs of a filter in the FPGA; and the FPGA communicates with the DSP through an external interface XINTF (eXternal INTerFace). The invention has the advantages that the quick high-precision method is simple, reliable and easy to realize; and high analog-to-digital conversion precision and conversion speed can be obtained by using a proper module with the sigma-delta modulating function. The quick high-precision method is applied to a motor for controlling the extraction of a voltage fundamental wave so as to quickly and accurately extract the fundamental wave of the voltage; and the extracted fundamental wave of the voltage can be directly applied to control or protection of the motor.

Description

technical field [0001] The invention relates to a high-precision and fast analog quantity sampling method for a motor, in particular to a high-precision and fast analog quantity sampling method for an AC speed regulation system of a mine hoist. Background technique [0002] In motor control, it is necessary to detect analog quantities such as motor current and voltage at all times for the control and protection of the motor. Almost all of the current control systems are digital control systems. How to accurately and timely detect these analog quantities and convert them into digital signals for use by the control circuit is a key link in motor control. [0003] In addition, whether vector control or direct torque control is performed on the motor, accurate sampling of the motor voltage is required. Because most of the voltage passed into the motor is obtained through the inverter of the voltage source inverter. What is directly detected by traditional sensors is a series ...

AI Technical Summary

Problems solved by technology

[0011] The purpose of this invention is to provide a high-precision and fast analog quantity sampling method for the AC speed control system of mine hoist, which solves the problem of electronic components existing in the existing analog-to-digital converter Sensitivity to changes in device parameters and complex networks make it impossible to achieve high precision

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