JPS6077299U

JPS6077299U - Inverter overcurrent stall protection device

Info

Publication number: JPS6077299U
Application number: JP16991383U
Authority: JP
Inventors: 徹宮島
Original assignee: 三菱電機株式会社
Priority date: 1983-11-01
Filing date: 1983-11-01
Publication date: 1985-05-30
Also published as: JPH0329996Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は電源部を含めたインバータの一般的な構成およ
び制御部の構成を示す１１７２図、第２図は従来のイン
バータの過電流失速保護装置の構成を示すブ冶ツク図、
第３図はその作用を説明するためにインバータを構成す
る要素の安全動作領域を示す説明図、第４図は本考案に
係るインバータの過電流失速保護装置の一実施例の構成
を示すブロック図である。１・・・・・・コンバータ、２・・・・・・コンデンサ
、３・・・・・・インバータ、４・・・・・・交流電動
機、５・・・・・・周波数設定器、６・・・・・・運転
、停止スイッチ、７・・・・・・電流検出器、８・・・
・・・単安定マルチバイブレータ、１０・・・・・・加
減速率設定回路、２０．２０ａ・・・・・・過電流失速
保護回路、２２・・・・・・絶対値回路、２３・・・・
・・比較器、２４，２５・・・・・・設定器、２６ａ、
２６ｂ・・・・・・アナログスイッチ、２７ａ、２７ｂ
・・・・・・ＮＯＴ回路。第２図ｒ２０：　　　　ゝひ」　　ｉ ■ コしクスエミツク￥圧（■ン第４図 −撃０Fig. 1 is a block diagram showing the general configuration of an inverter including a power supply unit and the configuration of a control unit, and Fig. 2 is a block diagram showing the configuration of a conventional overcurrent stall protection device for an inverter.
Fig. 3 is an explanatory diagram showing the safe operating area of the elements constituting the inverter to explain its operation, and Fig. 4 is a block diagram showing the configuration of an embodiment of the inverter overcurrent stall protection device according to the present invention. It is. 1...Converter, 2...Capacitor, 3...Inverter, 4...AC motor, 5...Frequency setting device, 6... ...Run, stop switch, 7...Current detector, 8...
... Monostable multivibrator, 10... Acceleration/deceleration rate setting circuit, 20.20a... Overcurrent stall protection circuit, 22... Absolute value circuit, 23...・
... Comparator, 24, 25... Setting device, 26a,
26b...Analog switch, 27a, 27b
・・・・・・NOT circuit. Figure 2 r20: ゝhi'' i

Claims

[Claims for Utility Model Registration] The DC power of the power supply section is converted into AC power and supplied to the AC motor, and the AC power generated as the AC motor decelerates is converted into DC power. A control device for an inverter regenerated in a power distribution section includes a run/stop switch in a frequency setting signal path, and an acceleration/deceleration rate setting circuit capable of suppressing the rate of change over time of the frequency, and the control device controls the rate of increase or decrease of the force when excessive current flows through the inverter. An overcurrent stall protection device for an inverter that applies a frequency change suppression signal to a speed rate setting circuit, comprising: a current detector that detects the current flowing through the inverter; and an absolute value circuit that converts the output signal of the current detector to unipolar. a first setting device for setting an overcurrent stall protection operating point during startup and constant speed operation of the AC motor; a second setting device for setting an overcurrent stall protection operating point during deceleration of the AC motor; , a signal selection circuit that selects and outputs a signal from the first setter when the run/stop switch is on, and a signal from the second setter when the run/stop switch is off; and the absolute value. and a comparator that compares the output of the circuit and the output of the selection circuit and applies a frequency change suppression signal to the acceleration/deceleration rate setting circuit when the output of the absolute value circuit exceeds the output of the selection circuit. Features an inverter overcurrent stall protection device.