High-speed control method of induction motor with field-weakening operation in voltage extension region

Abstract

An induction motor high speed control method for weak magnetic operation of a voltage expansion region belongs to the motor control technology field, and is aimed at solving the problems of a conventional induction motor high speed weak magnetic control method that the dynamic performance of voltage closed loop weak magnetic control is poor in a voltage expansion region and the utilization rate of DC bus voltage is low. The method includes the following steps: setting a voltage adjusting parameter kext, and obtaining a weak magnetic factor after the voltage adjusting parameter is processed by a voltage given adjustable weak magnetic controller; carrying out calculation and obtaining a torque component amplitude limit initial value; through processing of the rotating speed of a given rotor and the rotating speed of an actual rotor, obtaining a q-axis given voltage value and a d-axis given voltage value; controlling an induction motor by a self-limiting module in a transition section, and then making the inductor motor enter a first weak magnetic region; and in a second weak magnetic region, enabling output |usd| to be stabilized to be equal to an expression shown in the description through PI adjusting until the rotating speed of the rotor reaches a given value. The induction motor high speed control method is used for weak magnetic operation control of a voltage expansion region of an induction motor.

Description

technical field [0001] The invention relates to a high-speed control method of an induction motor with weak magnetic operation in a voltage expansion area, and belongs to the technical field of motor control. Background technique [0002] With the development of science and technology, there are more and more occasions that require high-speed operation of motors, such as CNC machine tools, electric vehicles, compressors for air conditioners or refrigerators, etc. These occasions put forward more requirements for speed regulation of induction motors, such as: wide speed regulation range, stable high-speed operation, maximum torque output capability, full utilization of voltage and current resources, fast response speed, etc. High-speed motors have the following advantages: First, due to the high speed, the volume is smaller than ordinary motors, which can effectively save materials. The second is that it can be connected with the prime mover, canceling the traditional decele...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of poor dynamic performance of the voltage closed-loop field weakening control in the voltage expansion area and low utilization rate of the DC bus voltage in the existing induction motor high-speed field weakening control method, and provides a voltage expansion area weak High Speed ​​Control Method of Induction Motor with Magnetic Operation

Images