Variable-frequency speed regulation controller

Abstract

The invention relates to a variable-frequency speed regulation controller, which comprises a frequency regulating module, a frequency display module, a phase accumulator module, a waveform storage module and a Clark transformation module. The frequency regulating module is used for inputting acquired frequency set value from a keyboard, the frequency display module is used for receiving signals output by the frequency regulating module and sending the frequency set value input from the keyboard to a display screen to display in real time, the phase accumulator module is used for receiving the signals output by the frequency regulating module and regulating phase to generate required sinusoidal waveform by coordinating with the waveform storage module, the waveform storage module is used for receiving phase values output by a phase accumulator and converting the phase values into sinusoidal voltage amplitude values so that voltage waveforms are generated, and the Clark transformation module is used for receiving sinusoidal voltage output by the waveform storage module and performing vector disintegration of the sinusoidal voltage in the space coordinate system. The structure of the variable-frequency speed regulation controller is simplified, cost is reduced and the variable-frequency speed regulation controller can meet the requirements of various places requiring variable-frequency speed regulation.

Description

technical field [0001] The invention relates to the field of frequency conversion speed regulation control, in particular to a frequency conversion speed regulation controller. Background technique [0002] The basic idea of ​​constant voltage-frequency ratio (VVVF) control is to keep the ratio of the voltage and frequency of the motor at a constant value when the base frequency (generally the rated frequency) is below, so as to ensure the constant rotor flux. The reason for this is that if the magnetic flux is too weak, the iron core of the motor cannot be fully utilized, which is a waste; if the magnetic flux is increased, the iron core will be saturated, resulting in excessive excitation current, and in severe cases, the winding will overheat and damage the motor. When it is above the fundamental frequency, the frequency can be increased all the time, but the voltage cannot be increased higher than the rated voltage, so the frequency is increased by weakening the magneti...

AI Technical Summary

Problems solved by technology

However, in most cases, FPGA still needs the assistance of other microcontrollers such as DSP, and does not have the function of independently realizing frequency conversion and speed regulation, which also affects the stability of control and the cost is also high.

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