Control method and device for intelligently calibrating special-purpose frequency converter for synchronous motor, and frequency converter

Abstract

The invention discloses a control method and device for intelligently calibrating a special-purpose frequency converter for a synchronous converter, and the frequency converter. The control method comprises the steps of obtaining feedback information from an excitation cabinet, and confirming completion of excitation; starting an intelligent calibration function; and implementing intelligent calibration regularly so that a rotor is adjusted to a preset position. The method, device and frequency converter provided by the invention can reduce the cost of hardware design, simplifies the onsite installation difficulty, can reduce the fault probability, and is easy to maintain.

Description

technical field [0001] The invention relates to the technical field of intelligent pole calibration control of a frequency converter dedicated to a synchronous motor, in particular to a method and device for intelligent pole calibration control of a frequency converter dedicated to a synchronous motor and a frequency converter. Background technique [0002] In the existing field of AC motors, AC motors can be classified into asynchronous motors and synchronous motors. Due to the high controllability of the motor speed, higher load disturbance resistance and other reasons, the proportion of synchronous motor applications in the total motor volume continues to increase, especially due to technological reasons, most of the ultra-high-power and high-power motors are synchronous motors. They are an important load for high-voltage frequency converters. [0003] However, the power supply that provides electric energy for the three-phase symmetrical winding of the stator of a synch...

AI Technical Summary

Problems solved by technology

[0010] 2) It is inconvenient to install on the project site, and even cannot meet the installation conditions, which limits the application occasions of the equipment

First, the installation of the absolute encoder requires a turning hole in the motor shaft, which increases the difficulty of installation; second, the power supply problem of the absolute encoder; third, the wiring of the encoder signal cable needs to consider the anti-interference problem; fourth, the encoder The distance of signal transmission is limited, which affects the application range of the inverter, or needs to add signal repeaters, increasing system complexity and failure rate

[0011] 3) High failure rate and difficult to maintain

The life of an absolute encoder largely depends on the quality of the installation and the quality of the power supply. It is easy to be damaged in actual use, and the maintenance is troublesome.

Images