Unlock instant, AI-driven research and patent intelligence for your innovation.

AC motor vector control apparatus

A technology of AC motor and vector control, applied in AC motor control, motor control, AC motor angular single-axis angular velocity control, etc., can solve problems such as oscillation and motor control instability, and achieve the effect of simplified suppression

Active Publication Date: 2011-10-26
MITSUBISHI ELECTRIC CORP
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has been widely used in electrified railways in the past, but it is known that when the above-mentioned system is used in electrified railways powered by direct current, the reactor and capacitors for absorbing harmonics arranged on the direct current side of the inverter are known to be The LC filter circuit generates electrical oscillations, the voltage across the capacitor (capacitor voltage) oscillates, and the control of the motor becomes unstable. Non-patent literature 1 and non-patent literature 2 have a damping control method for suppressing this instability. revealed

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • AC motor vector control apparatus
  • AC motor vector control apparatus
  • AC motor vector control apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0055] figure 1 It is a block diagram showing the configuration of the vector control device for an AC motor according to Embodiment 1 of the present invention.

[0056] Such as figure 1 As shown, the main circuit has a DC power supply 1, and an LC filter circuit formed by a reactor 2 and a capacitor 3 in order to suppress the high-order harmonic current from flowing out to the power supply side; it has an inverter using an AC voltage converted to an arbitrary frequency 4. A vector control device 50 for converting the voltage across the capacitor 3 (capacitor voltage) Efc to AC to perform vector control on the AC motor 6.

[0057] The vector control device 50 is composed of a vector control unit 30 and a damping control unit 40, and inputs the signal ωr from the speed detector 7 for detecting the rotation speed of the AC motor 6, and the signals Iu and Iv from the current detectors 5a to 5c for detecting the motor current. , Iw, the voltage Efc of capacitor 3.

[0058] In a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An AC motor vector control apparatus includes a damping control part that provides an automatic calculation of optimum damping manipulation amount to eliminate the necessity of a gain setting itself, thereby simplifying the adjustment operation of the control system. There are included a vector control part (30) that performs a vector control of an AC motor (6) in accordance with a current command or a torque command; and a damping control part (40) that calculates a damping manipulation amount to be used for suppressing the variation of a capacitor voltage (Efc). The damping control part (40) calculates a variation rate of the capacitor voltage (Efc) and uses a damping manipulation amount in accordance with the variation rate to manipulate the current command or torque command of the vector control part (30), thereby controlling an inverter (4) such that the current flowing through the inverter (4) is changed to a direction that suppresses the variation of the capacitor voltage (Efc).

Description

technical field [0001] The invention relates to a vector control device of an AC motor for vector control of the AC motor. Background technique [0002] The technique of vector control of an AC motor using an inverter is widely used in the industry. This technology has been widely used in electrified railways in the past, but it is known that when the above-mentioned system is used in direct current electrified railways, the reactor and capacitors for harmonic absorption arranged on the DC side of the inverter The LC filter circuit generates electrical oscillations, the voltage across the capacitor (capacitor voltage) oscillates, and the control of the motor becomes unstable. Non-Patent Document 1 and Non-Patent Document 2 disclose a damping control method for suppressing this instability. revealed. [0003] Non-Patent Document 1: Akira Kimura et al., "Investigation on the Stabilization of the Control System of an Electric Vehicle Driven by an Induction Motor", Journal of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P27/04H02P21/13H02P21/22H02P23/07H02P23/16
CPCH02P21/05H02P27/04H02P29/026B60L2200/26Y02T10/64H02P21/00H02P27/06B60L9/18
Inventor 北中英俊
Owner MITSUBISHI ELECTRIC CORP