JPS6168696U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の電圧型インバータの過電圧吸
収装置の実施例の回路図である。 図中、はインバータ、１は順変換部、２は電
解コンデンサ、３はスイツチ、４は抵抗、５は逆
変換部、６は開閉器、７は電動機、８は計器用変
流器、９は整流回路、１０は増幅器、１１は電流
設定器、１２は比較器を示す。 FIG. 1 is a circuit diagram of an embodiment of an overvoltage absorbing device for a voltage type inverter according to the present invention. In the figure, is an inverter, 1 is a forward conversion section, 2 is an electrolytic capacitor, 3 is a switch, 4 is a resistor, 5 is an inverse conversion section, 6 is a switch, 7 is a motor, 8 is a current transformer for measuring instruments, and 9 is a In the rectifier circuit, 10 is an amplifier, 11 is a current setting device, and 12 is a comparator.

Claims (1)

【実用新案登録請求の範囲】 順変換部と、サイリスタおよび帰還ダイオード
よりなる逆変換部とを有し、その出力側に接続さ
れた多数の電動機群を速度制御する電圧型インバ
ータであつて、電動機群の並列運転時の回生エネ
ルギーを力行運転時の電動機に供給するものにお
いて、 前記電動機群に供給される負荷電流を検出する
負荷電流検出手段と、 前記電動機群が少数台運転時（１台乃至数台分
に相当）の負荷電流に設定された基準信号を出力
する電流設定器と、 前記検出手段からの負荷電流と電流設定器の基
準信号とを比較して電動機群が多数台運転か少数
台運転かを判別する比較器と、 前記比較器から導びかれる信号を基に、多数台
運転であれば開路され、少数台運転であれば閉路
される開閉制御が行なわれ、かつインバータ直流
中間回路に介挿されているスイツチと、 前記スイツチと直列接続された抵抗と を備える電圧型インバータの過電圧吸収装置。[Claims for Utility Model Registration] A voltage-type inverter that has a forward conversion section and an inverse conversion section consisting of a thyristor and a feedback diode, and controls the speed of a large number of motor groups connected to the output side of the voltage-type inverter, A device for supplying regenerative energy during parallel operation of a group of motors to a motor during power running, comprising: load current detection means for detecting a load current supplied to the group of motors; A current setting device outputs a reference signal set to a load current corresponding to several motors (equivalent to several motors), and the load current from the detection means is compared with the reference signal of the current setting device to determine whether a large number of motors are in operation or a small number of motors are being operated. Based on a comparator that determines whether the unit is in operation, and a signal derived from the comparator, opening/closing control is performed in which the circuit is opened if a large number of units are in operation, and closed if a small number of units are in operation. An overvoltage absorption device for a voltage type inverter, comprising: a switch inserted in a circuit; and a resistor connected in series with the switch.