JPS60128498U

JPS60128498U - AC motor control circuit

Info

Publication number: JPS60128498U
Application number: JP1984012908U
Authority: JP
Inventors: 中村　昌典; 猛中西
Original assignee: 株式会社島津製作所
Priority date: 1984-01-31
Filing date: 1984-01-31
Publication date: 1985-08-29

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図はこの考案の一実施例の構成を示す回路図、第２
図は第１図の操作スイッチならびに各リレー接点の動作
タイミング図である。１．２：電源ライン、３：単相交流モータ、４：トライ
アック、５：操作スイッチ、６：ヒユーーズ、７，８：
抵抗、９：整流器、Ｒ１，Ｒ２゜Ｒ３：リレー、Ｒ１−
ａ、Ｒ２−ｂ、Ｒ３−ａ：リレー接点。Figure 1 is a circuit diagram showing the configuration of an embodiment of this invention;
The figure is an operation timing diagram of the operation switch and each relay contact in FIG. 1. 1.2: Power line, 3: Single-phase AC motor, 4: Triac, 5: Operation switch, 6: Fuse, 7, 8:
Resistor, 9: Rectifier, R1, R2゜R3: Relay, R1-
a, R2-b, R3-a: Relay contacts.

Claims

[Scope of utility model registration request]

(1) In a control circuit configured to control a bidirectional thyristor connected to an energizing power supply circuit of an AC motor to control power supply to the AC motor, the fuse is connected in series to the energizing power supply circuit. A bypass circuit is provided which is connected to the detection relay and which is closed in connection with opening of the control circuit of the bidirectional thyristor and connects the fuse directly to the energizing power supply circuit, the bypass circuit being connected to at least the continuity detection relay. The fuse is formed by a series circuit of a normally open contact of the relay for detecting continuity and a protective resistor, and is characterized in that when the relay for continuity detection is energized, a large current is passed through the bypass circuit to blow the fuse. AC motor control circuit.

(2) Control of an AC motor according to claim 1 of the utility model registration claim, wherein the bypass circuit is closed after a predetermined time in connection with opening of the control circuit of the bidirectional thyristor. circuit.

(3) A circuit that closes the bypass circuit after a predetermined time is
A utility model characterized in that the delay relay is interposed in the control circuit of a bidirectional thyristor and is deenergized after a predetermined period of time when the control circuit is opened, and the normally closed contact of the delay relay is connected in series to the bypass circuit. A control circuit for an AC motor according to claim 1 or 2.