CN2206518Y

CN2206518Y - Energy-saving contactor for three-phase asynchronous electric motor

Info

Publication number: CN2206518Y
Application number: CN 94206258
Authority: CN
Inventors: 肖冠杰; 李程有; 张振华
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-02
Filing date: 1994-03-02
Publication date: 1995-08-30
Anticipated expiration: 2004-03-02

Abstract

The utility model relates to an energy-saving contactor for a three-phase asynchronous motor, comprising a shell body and a circuit board. The utility model is characterized in that the front side of the shell body is provided with an indicating lamp and a wire connecting hole; the bottom surface of the shell body is provided with a wire plugging hole. The circuit on the circuit board is divided into three groups; each group corresponds to phase current. Each group comprises a thyristor main return circuit and a thyristor protective circuit, an ac to dc power supply circuit, a power supply following ac to dc circuit, a delay time and slow starting circuit and an overcurrent protecting circuit. In the energy-saving contactor for a three-phase asynchronous electric motor, a contactor a mutual inductor are combined into one body with the functions of soft start and over-current protection. Therefore, the problem of phase shifting of a three-phase asynchronous motor is solved. The utility model which can control a motor to run normally in light and heavy runtime is a comparatively ideal energy-saving contactor.

Description

Energy-saving contactor for three-phase asynchronous electric motor

The utility model relates to a kind of motor contactor, is a kind of threephase asynchronous energy-saving contactor that reflects motor-output adjustment size of current.

At present, the contactor that industrial and mining enterprises use is to utilize electromagnet suction and spring reaction power interoperation, and contact is opened or closed electrical equipment, can be divided into A.C. contactor and D.C. contactor by the kind of its contact by electric current.A.C. contactor mainly partly is made up of electromagnetic system, contact system, arc-control device etc., this contactor construction complexity, sensitivity is low, often between the action, be easy to bonding, break not open, the contact poor performance, maintenance capacity is big.

The purpose of this utility model provides a kind of threephase asynchronous energy-saving contactor, to solve the above-mentioned shortcoming of A.C. contactor, promotes using and developing of electric power automatic control and protection motor.

The purpose of this utility model is achieved in that this energy-saving contactor is rectangular or square, form by housing and wiring board two parts, there are three indicator lights in the housing front, showing the motor-output size, six wiring holes are arranged below it, have in the housing bottom surface and corresponding six plug wire holes of wiring hole, three entrance holes wherein, three wire holes have at least 3 boss in housing, above intrinsic wiring board.There is base plate the back.This circuit divides three groups, and every corresponding one group, every group comprises controllable silicon major loop and silicon controlled rectifier protecting circuit, is by bidirectional triode thyristor T ₁With the capacitor C in parallel with it ₁, resistance R ₁, diode D ₁, form, the AC-DC power supply circuits are by transformer B ₁, diode D ₂---D ₅, electrochemical capacitor C ₂, resistance R ₃, R ₄, LED ₁, controllable silicon t ₁With self-lock switch AN ₁, knob AN battle ₂Form; Following power supply AC-DC circuit is by induction coil L ₁Bridge rectifier diode D ₆---D ₉, electrochemical capacitor C ₄Form; Time-delay slow start circuit is by resistance R ₂, electrochemical capacitor C ₃Form, current foldback circuit is by electromagnet l ₁, tongue tube F ₁Form.

During use: inlet wire is connected three phase mains, and outlet connects threephase asynchronous, with AN ₁AN ₂Press, power connection, motor starting, when motor began to start, controllable silicon both end voltage signal was by the secondary transformation, become direct current through full-wave rectification, and electric current is through R ₂To C ₃Slowly charging is simultaneously through current-limiting resistance R ₃And LED ₁To controllable silicon T ₁Gate pole slowly send electricity, and when motor operation increased the weight of, the use electric current of motor rose naturally, follows the increase of power supply inductive current, through full-wave rectification to resistance R ₃The front end power supply, the bidirectional triode thyristor gate pole changes with the electric current increase and decrease angle of flow, thereby can adjust voluntarily motor weight operation different situations, when motor running current overshoot value, electromagnet l ₁Magnetic force greater than design load, the adhesive tongue tube, tongue tube is become normally closed by normal ON state, go into short circuit, the silicon controlled gate pole signal of telecommunication is zero, motor is out of service.

This utility model compared with prior art has the following advantages: 1) be provided with the direct current supply of this phase, solved the phase shift problem of threephase asynchronous; 2) under the weight service conditions, the signal of telecommunication can be controlled motor by adjustment controllable silicon gate signal and normally move; 3) with contactor and instrument transformer, soft start and overcurrent protection four functions molten be one; 4) installation and maintenance are convenient; 5) can economize on electricity 10 than electromagnetic contactor---40%.

Do step explanation below in conjunction with accompanying drawing:

Fig. 1: threephase asynchronous energy-saving contactor structural representation;

Fig. 2: threephase asynchronous energy-saving contactor electrical schematic diagram.

Among Fig. 1: housing (1) adopts plastics to make, be its positive middle part of concave shape three light emitting diode lamps (3) are arranged, to show every phase working condition, six wiring holes (5) are arranged below it, at housing bottom surface and corresponding six plug wire holes of wiring hole (6), 3 entrance holes wherein, 3 wire holes are arranged, there are at least 3 boss (4) housing (1) inboard, there is screw at its center, by screw wiring board (2) is arranged above, and there is base plate (7) back, base plate (7) leans on screw with housing (1) or cements in, and (7) four jiaos of base plates or four limits are provided with screw hole.

Among Fig. 2: bidirectional triode thyristor T ₁Have 3 groups, every group of correspondence one is electric mutually, every group of controllable silicon T ₁On be parallel with by capacitor C ₁, meet diode D ₁Plus earth, diode is parallel with resistance R ₁With diode D ₁The silicon controlled rectifier protecting circuit of forming (8), AC-DC power supply circuits (9) are by self-lock switch AN ₁, transformer B ₁With bidirectional triode thyristor T ₁Parallel connection is through D ₂---D ₅Meet electrochemical capacitor C after the diode bridge rectification ₂Anodal, ground connection meet switching tube F ₁Positive pole, order simultaneously is to controllable silicon t ₁Positive pole, connecting resistance R ₄, meet rotary switch AN ₂Meet controllable silicon t ₁Gate pole, t ₁Negative pole connecting resistance R ₃, light-emitting diode LFD ₁, meet controllable silicon T ₁Gate pole, connecting resistance R simultaneously ₂Meet electrochemical capacitor C ₃Positive pole, the slow start circuit (10) that minus earth is formed; Following power supply AC-DC power supply circuits (12) is by inductance coil L ₁, rectifier diode D ₆---D ₉, behind bridge rectifier, meet electrochemical capacitor C ₄Positive pole, capacitor C ₄Minus earth; Current foldback circuit (11) is by electromagnet l ₁, the one termination is followed the power supply bridge rectifier, another termination controllable silicon t ₁Negative pole meets tongue tube F by time-delay slow start circuit (10) ₁Minus earth.

Claims

1, a kind of threephase asynchronous energy-saving contactor is rectangular or square; form by housing (1) wiring board (2); it is characterized in that: there are three indicator lights (3) in housing (1) front; six wiring holes (5) are arranged below it; have and corresponding six plug wire holes of wiring hole (6) in housing (1) bottom surface; at least 3 boss (4) are arranged in housing (1); above intrinsic wiring board (2); there is base plate (7) back; circuit divides three groups on the wiring board; every group of correspondence one is electric mutually, and every group comprises controllable silicon major loop and protective circuit (8), be by bidirectional triode thyristor T ₁With the capacitor C in parallel with it ₁, resistance R ₁, diode D ₁Form, AC-DC power supply circuits (9) are by transformer B ₁, diode D ₂---D ₅, electrochemical capacitor C ₂, controllable silicon t ₁, resistance R ₄, R ₃, LED ₁With self-lock switch AN ₁, push switch AN ₂Form; Following power supply AC-DC circuit (12) is by coil L ₁, rectifier diode D ₆---D ₉, electrochemical capacitor C ₄Form; Time-delay slow start circuit (10) is by resistance R ₂, electrochemical capacitor C ₃Form; Current foldback circuit (11) is by electromagnet l ₁, tongue tube F ₁Form.

2, contactor according to claim 1 is characterized in that: silicon controlled rectifier protecting circuit (8) is by capacitor C in the parallel connection one of bidirectional triode thyristor positive and negative end ₁, resistance R ₁With diode D ₁The circuit of forming, capacitor C ₁Meet diode D ₁Plus earth, diode D ₁Be parallel with resistance R ₁

3, contactor according to claim 1 is characterized in that: AC-DC power supply circuits (9) are by self-lock switch AN ₁, transformer B ₁With bidirectional triode thyristor T ₁Parallel connection, with induced current through D ₂---D ₅Meet electrochemical capacitor C after the diode bridge rectification ₂Anodal, switching tube F ₁Positive pole meets controllable silicon t ₁Positive pole is through resistance R ₄, push switch AN ₂Meet t ₁Gate pole, t ₁Negative pole connecting resistance R ₃, light-emitting diode LFD ₁Meet bidirectional triode thyristor T ₁Gate pole.

4, contactor according to claim 1 is characterized in that: slow start circuit (10) is at controllable silicon t ₁Be connected in series a resistance R between the power supply ₂, meet electrochemical capacitor C ₃Anodal minus earth.

5, contactor according to claim 1 is characterized in that: current foldback circuit (11) is by electromagnet l ₁One termination is followed power supply AC-DC power supply circuits (12), but another termination silicon t ₁Negative pole passes through resistance R ₂, electrochemical capacitor C ₃Meet tongue tube F ₁Minus earth.

6, contactor according to claim 1 is characterized in that: following power supply AC-DC power supply circuits (12) is by coil L ₁Produce induced current, then through diode D ₆---D ₉Meet electrochemical capacitor C behind the bridge rectifier ₄Connect minus earth.