JPS59138400U

JPS59138400U - overvoltage protection device

Info

Publication number: JPS59138400U
Application number: JP3244583U
Authority: JP
Inventors: 小林　澄雄
Original assignee: 株式会社東芝
Priority date: 1983-03-07
Filing date: 1983-03-07
Publication date: 1984-09-14

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 the drawing]

第１図ａ、　　ｂは従来の過電圧保護装置を適用した電
動機運転システムを示す構成図、第２図ａ。ｂは本考案の一実施例を示す構成図、第３図ａ。ｂは本考案の他の実施例を示す構成図である。１・・・整流器部、２・・・コンデンサ、３・・・イン
バータ部、４・・・交流電動機、５・・・過電圧保護回
路、５１・・・過電圧検出回路、５２′・・・ベースド
ライブ回路、５３′・・・トランジスタ、５４・・・抵
抗、６・・・トランス、７１〜７４・・・整流器、８１
〜８６・・・ベース抵Ｌ　９１〜９６−・・ドライブト
ランジスタ、１０・・・サーボモータ。Figures 1a and 1b are block diagrams showing a motor operating system to which a conventional overvoltage protection device is applied, and Figure 2a is a diagram. FIG. 3a is a block diagram showing an embodiment of the present invention. b is a block diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Rectifier section, 2... Capacitor, 3... Inverter section, 4... AC motor, 5... Overvoltage protection circuit, 51... Overvoltage detection circuit, 52'... Base drive Circuit, 53'... Transistor, 54... Resistor, 6... Transformer, 71-74... Rectifier, 81
~86...Base resistor L 91~96-...Drive transistor, 10...Servo motor.

Claims

[Scope of utility model registration request]

(1) In a motor that operates a motor by controlling switching of the DC power supply output using a switching circuit consisting of a plurality of transistors, the voltage between the poles of the DC power supply reaches a predetermined voltage or higher due to regenerative energy during braking of the motor. Provided that the discharge circuit comprises a transistor and a resistor provided to short-circuit the poles of the DC power supply, and the base dry power supply of the transistor of the discharge circuit is shared with the base drive power supply of the transistor of the switching circuit. An overvoltage protection device featuring:

(2) The DC power output obtained by rectifying AC power in a rectifier section is applied via a capacitor to an inverter section consisting of a plurality of transistors whose switching is controlled sequentially to convert it into AC power of an arbitrary frequency. In an electric motor that operates at a variable speed, a resistor and a transistor are provided to short-circuit the capacitor terminals when the terminal voltage of the capacitor charged with regenerative energy during braking of the AC motor reaches a predetermined voltage or higher. The overvoltage protection device according to claim 1, which is a registered utility model, comprising a discharge circuit comprising a discharge circuit, the base drive power source of the transistor of the discharge circuit being shared with the base drive power source of the transistor of the inverter section.

(3) The DC power output obtained by rectifying AC power in a rectifier section is applied to a motor drive circuit consisting of a plurality of switching-controlled transistors connected in a bridge circuit via a capacitor to control the DC servo. In a device that operates a motor, the capacitor is composed of a resistor and a transistor provided to short-circuit the capacitor terminals when the terminal voltage of the capacitor charged with regenerative energy during braking of the servo motor reaches a predetermined voltage or higher. The overvoltage protection device according to claim 1, which is a registered utility model, and comprises a discharge circuit, and the base drive power source of the transistor of the discharge circuit is shared with the base drive power source of the transistor of the servo motor drive circuit.