JPH0428797U

JPH0428797U -

Info

Publication number: JPH0428797U
Application number: JP6833590U
Authority: JP
Priority date: 1990-06-27
Filing date: 1990-06-27
Publication date: 1992-03-06

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の回路構成図、第２
図は本考案の他の実施例の回路構成図、第３図は
従来例の構成図、第４図は他の従来例の回路構成
図である。１……インバータ装置、２……マグネツトコン
タクタ、３……誘導電動機、５……出力電流検出
器、１１……順変換部、１２……逆変換部、１３
……制御部、２０……電圧設定回路、２１……電
圧設定器、２２……定格電圧設定器、２３……定
格電圧１／√３設定器。 Figure 1 is a circuit configuration diagram of an embodiment of the present invention;
3 is a circuit diagram of another embodiment of the present invention, FIG. 3 is a circuit diagram of a conventional example, and FIG. 4 is a circuit diagram of another conventional example. DESCRIPTION OF SYMBOLS 1... Inverter device, 2... Magnetic contactor, 3... Induction motor, 5... Output current detector, 11... Forward conversion section, 12... Inverse conversion section, 13
...Control unit, 20...Voltage setting circuit, 21...Voltage setting device, 22...Rated voltage setting device, 23...Rated voltage 1/√3 setting device.

Claims

[Claims for Utility Model Registration] (1) In a starting device that directly starts an induction motor using an inverter device as a power source, a frequency is set in a control section of the inverter device to obtain the rotation speed during steady operation. The inverter device comprises a first frequency setting means, a second frequency setting means for setting a frequency lower than the set frequency, and a switching means for switching between the first frequency setting means and the second frequency setting means. The output frequency of the inverter is set by the second frequency setting means to start the induction machine, and when the output current of the inverter device becomes equal to or higher than the set current value, the switching means sets the output frequency to the first frequency setting means. A starting device for an induction motor using an inverter device, characterized in that it is configured to switch. (2) In a starting device that uses an inverter device as a power source to directly turn on and start an induction motor, the control section of the inverter device includes a rated voltage setting means for setting the output voltage to the rated voltage, and approximately 1/√ of this rated voltage. Rated voltage 1/set to voltage 3
√3 setting means, and a switching means for switching between the rated voltage setting means and the rated voltage 1/√3 setting means, the output voltage of the inverter device is set by the rated voltage setting means, and the induction motor is started. , an induction machine using an inverter device, characterized in that the switching means switches to the rated voltage 1/√3 setting means after completion of starting after the output current of the inverter device becomes equal to or higher than the set current value. starting device.