CN203151408U

CN203151408U - Soft starting device of motor

Info

Publication number: CN203151408U
Application number: CN 201220749261
Authority: CN
Inventors: 董捷; 任尚策
Original assignee: Zhaoqing Leoch Battery Technology Co Ltd
Current assignee: Zhaoqing Leoch Battery Technology Co Ltd
Priority date: 2012-12-31
Filing date: 2012-12-31
Publication date: 2013-08-21
Anticipated expiration: 2022-12-31

Abstract

Disclosed in the utility model is a soft starting device of a motor. The soft starting device comprises a three-phase asynchronous motor, a soft starter, and a starting circuit. The starting circuit includes a starting switch and a stop switch, wherein the contact of the starting switch is normally open and the contact of the stop switch is normally closed. In addition, the soft starting device also includes a bypass contactor and a bypass switch. And the starting circuit is connected in series with three phases of the three-phase asynchronous motor by a switch. When the soft starting circuit of the motor is employed, the motor in an acid mist dedusting tower can be started and stopped stably, thereby protecting electrical elements in the circuit.

Description

A kind of soft starter for motor device

Technical field

The utility model relates to the electrical applications technical field, especially a kind of soft starter for motor device.

Background technology

In the lead acid accumulator industry, the electric current of motor in the acid mist gas wash tower before startup is very big, the starting current of every motor can be 5～7 times of motor rated current, sizable electric current can cause very big rush of current to electrical network, even cause the overload of electrical network, burning out of electric elements contact, the impact that increases electrical network seriously influences, and influences the operate as normal of other electric components.

Produce bigger electric current in electric motor starting, the stopped process, to the protective device of electrical network, motor, as A.C. contactor, thermal overload relay, fuse etc., produce bigger impact, make the protection component of motor produce overload, cause the damage of protective device.So just caused the unnecessary expense of electric elements

The start-up course of motor former adopt direct startup, reduced-voltage starting, compensator starting, crosstalk resistance startup, star/triangle startups etc. more, it is excessive that but the multiple Starting mode of motor does not all fundamentally solve the electric current that takes place in the electric motor starting process, and the soft start of realization motor, the soft stop of motor are ended.

Soft initiator is a kind of Electric Machine Control equipment that integrates soft start, soft stop, light-load energy saving and multifunction protection.And can regulate various parameters in the start-up course according to the characteristic of motor load, as cut-off current, start-up time etc.

Summary of the invention

The purpose of this utility model provides a kind of utilization soft initiator, the starting drive that the effective soft start of motor, soft stop are ended.Avoid in electric motor starting, stopped process, producing bigger electric current, and realize the protection to electrical network, motor.

For achieving the above object, the utility model provides a kind of soft starter for motor device, comprising:

Threephase asynchronous machine; A soft initiator; Start-up circuit;

Start-up circuit comprises: starting switch, shutdown switch, bypass contactor, by-pass switch;

Start-up circuit is connected in series with the three-phase of threephase asynchronous machine by the 3rd switch.

The application's beneficial effect is: after adopting the soft start of this motor, the motor in the acid mist gas wash tower can be started stably, stop, having protected the electric component in the circuit.Can effectively protect electrical network, avoid the impact to electrical network.The protective device of protection motor reduces the damage to electric component, reduces the expense of spare part.Can effectively stop motor, avoid in motor stops, producing step.

Description of drawings

Fig. 1 is the circuit connection diagram of a kind of soft starter for motor device of the utility model.

Embodiment

By reference to the accompanying drawings the present invention is described in further detail below by embodiment.

Please refer to Fig. 1, the soft starter for motor manipulated or operated apparatus comprises, motor and soft initiator, and start-up circuit 1, start-up circuit 1 comprises: starting switch K1, often leave the contact of starting switch K1; Shutdown switch K2, the contact of shutdown switch K2 is normally closed; Bypass contactor KM1 and by-pass switch K3; Start-up circuit 1 is connected in series with the three-phase of threephase asynchronous machine by the 3rd K switch M2; The 3rd K switch M2 is contactor; Thermal relay FR and contactor K1 series connection connect threephase asynchronous machine.

In practical operation, can regulate the various parameters of start-up course according to the characteristic of motor load, as start-up time etc.As the starting switch K1 that presses the moving device of soft start, its closing of contact, circuit is connected, and starts soft initiator, and the contactor K1 in the circuit connects, starter motor.The output voltage of the thyristor of soft initiator inside increases gradually, and motor also accelerates gradually, and up to arriving rated revolution, start-up course finishes, and realizes the soft start of motor.

After electric motor starting finished, by-pass switch K3 closure was connected bypass contactor KM1.Bypass contactor KM1 replaces the thyristor of soft initiator inside, for the running of motor provides rated voltage.

When the shutdown switch of pressing soft initiator, voltage reduces gradually, and the revolution of motor descends gradually, only to stopping, realizing that the soft stop of motor is ended.

Above content be in conjunction with concrete execution mode to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace.

Claims

1. soft starter for motor device comprises:

Threephase asynchronous machine; Soft initiator; Start-up circuit (1);

Start-up circuit (1) comprising:

Starting switch (K1), often open the contact of described first switch (K1);

Shutdown switch (K2), the contact of described second switch (K2) is normally closed;

Bypass contactor (KM1) and by-pass switch (K3);

It is characterized in that: described start-up circuit (1) is connected in series with the three-phase of threephase asynchronous machine by the 3rd switch (KM2).

2. soft starter for motor device as claimed in claim 1 is characterized in that, also comprises thermal relay (FR), and described thermal relay (FR) and described the 3rd switch (KM2) series connection connect described threephase asynchronous machine.

3. soft starter for motor circuit as claimed in claim 1 or 2 is characterized in that, described the 3rd switch (KM2) is contactor.