CN221201029U - Contactor and electrical equipment - Google Patents

Abstract

The present utility model relates to a contactor and an electrical device. The contactor comprises: a movable iron core; a stationary core; a position switch; the third end and the fourth end of the rectifying and filtering circuit are connected with the first end and the second end of the position switch; the first end of the starting winding is connected with the fifth end of the rectifying and filtering circuit, and the second end of the starting winding is connected with the first end of the position switch and is coupled with the movable iron core and the static iron core; the first end of the holding winding is connected with the second end of the starting winding, and the second end of the holding winding is connected with the second end of the rectifying circuit through a unidirectional conduction device and is coupled with the movable iron core and the static iron core; the contactor is started, the position switch is closed, starting current flows through the starting winding, the movable iron core and the static iron core are started to be attracted, and the filtering energy storage device stores energy; in the attraction process of the movable iron core and the static iron core, the position switch is opened, the filtering energy storage device releases energy, the starting winding and the holding winding flow holding current, and the movable iron core and the static iron core of the contactor continue to be attracted until the contactor is in a complete attraction state. The contactor has simple structure and low cost.

Description

Contactor and electrical equipment

Technical Field

The utility model relates to the technical field of electric technology, in particular to a contactor and electric equipment.

Background

With the vigorous development of the automation industry, the artificial intelligence industry, the intelligent sensor, the computer technology, the control technology and the electronic technology, the function of controlling the electrical appliances is more important and the application is more extensive. The control type electric appliances are various, such as alternating current contactors and direct current contactors, and can be used for frequently switching on or switching off various terminal electric appliances in a long distance. Common control of equipment such as motors, transformers, illumination power consumption and the like in daily life. The technology has wide related fields, plays an important role in the development of life and social economic benefits of people in various fields of agriculture, industry, transportation, life and production.

At present, both alternating current contactors and direct current contactors are widely applied to various industries, but the application of the alternating current contactors and the direct current contactors is very wide, and a large amount of electric energy is consumed in the operation of the alternating current contactors and the direct current contactors in the year-round and month-round mode. In order to meet the requirements of green development of national economy, new edition (GB 21518-2022, energy efficiency limit value and energy efficiency grade of an alternating-current contactor) is strongly marked by 1 month 1 day 2024.

However, the energy-saving indexes of the products which are already proposed in the technical field of energy saving of the ac contactor in China are good, and the performances are also various, for example: chinese patent No. CN1107963C (mechanical self-locking AC contactor) adopts the mode of mechanical self-locking and electromagnet unlocking to lock the contact of the AC contactor in a closed state, thus achieving the purpose of energy saving. The power grid emergency power-off fault protection device has the advantages of complex structure, wide product modification range, high modification cost, incapability of being automatically disconnected when the power grid suddenly breaks down, and certain safety problem. Similarly, chinese patent No. ZL200820302979.8 (ac contactor energy saving device) uses dc high voltage start. The direct current low-voltage operation principle achieves the purpose of energy conservation. The electronic component has the defects of high cost, easy aging of the electronic component and inapplicability to use in high-temperature and high-humidity environments. In chinese patent No. 201420101284.9 (an energy-saving ac contactor), a permanent magnet is used as an iron core. The other core is soft magnetic and is wound with a coil that generates reverse magnetic flux. The permanent magnet is used for locking the contact of the contactor to be in a closed state so as to achieve the aim of saving energy. When the contactor needs to be restored to the initial state, the coil in the soft magnetic iron core is electrified to generate reverse magnetic flux to repel the permanent magnet, so that the contactor returns to the original position under the action force of the return spring. The permanent magnet is easy to demagnetize, soft iron is easy to generate remanence, the electronic circuit is high in cost, and if the release circuit fails, the safety is also problematic.

In summary, there is therefore an urgent need for a contactor that is simple in structure and low in cost.

Disclosure of utility model

Accordingly, it is necessary to provide a contactor and an electrical device which are simple in structure and low in cost.

In a first aspect, the present application provides a contactor, including a movable iron core and a stationary iron core, further including:

The first end and the second end of the rectifying and filtering circuit are connected with external alternating current;

the first end of the position switch is connected with the third end of the rectifying and filtering circuit, and the second end of the position switch is connected with the fourth end of the rectifying and filtering circuit;

A start winding, a first end of which is connected with a fifth end of the rectifying and filtering circuit, and a second end of which is connected with a first end of the position switch and is coupled with the movable iron core and the static iron core;

a holding winding, wherein a first end of the holding winding is connected with a second end of the starting winding, and the second end of the holding winding is connected with a second end of the rectifying and filtering circuit through a unidirectional conduction device and is coupled with the movable iron core and the static iron core;

When the contactor is started, the position switch is closed, starting current flows through the starting winding, so that the movable iron core and the static iron core of the contactor are started to be attracted, and a filtering energy storage device in the rectifying and filtering circuit stores energy;

In the attraction process of the movable iron core and the static iron core, the position switch is opened, the filtering energy storage device releases energy, and a holding current flows in the starting winding and the holding winding, so that the movable iron core and the static iron core of the contactor continue to be attracted until the contactor is in a complete attraction state.

In one embodiment, the rectifying and filtering circuit includes:

The first end and the second end of the rectifying circuit are connected with external alternating current, and the fourth end of the rectifying circuit is connected with the second end of the position switch;

the first end of the filtering energy storage device is connected with the third section of the rectifying circuit, and the second end of the filtering energy storage device is connected with the first end of the position switch;

When the contactor is started, the rectification circuit rectifies external alternating current to obtain starting voltage, so that starting current flows through the starting winding;

when the position switch is turned on, the rectifying circuit outputs a half-wave rectified voltage so that a holding current flows in the start winding and the holding winding.

In one embodiment, the contactor further comprises:

the trigger head moves along with the movable iron core, and in the attraction process of the movable iron core and the static iron core, the position switch is pushed open by the trigger head.

In one embodiment, the internal resistance of the start winding is less than the internal resistance of the hold winding.

In one embodiment, the rectified current is a bridge rectified current.

In one embodiment, the filter energy storage device is a capacitor.

In one embodiment, the capacitance is less than a predetermined value.

In one embodiment, the unidirectional conducting device is a diode.

In one embodiment, the contactor further comprises a return spring and a normally open contact, wherein the movable iron core and the static iron core are pulled apart under the action of the return spring, and the normally open contact is in an open state.

In a second aspect, the application also provides an electrical device comprising a contactor as described in any one of the embodiments above.

The contactor and the electrical equipment only adopt the rectifying and filtering circuit, the position switch, the starting winding, the holding winding and the unidirectional conduction device, so that components are reduced, the structure is simple and miniaturized, the components all have the characteristic of high-reliability operation, and meanwhile, the service life of the type of contactor is greatly prolonged, a great amount of raw material loss is saved for society, and the cost is reduced. When the contactor is started, the position switch is closed, starting current flows through the starting winding, so that the movable iron core and the static iron core of the contactor are started to be attracted, and the filtering energy storage device stores energy; in the attraction process of the movable iron core and the static iron core, the position switch is opened, the filtering energy storage device releases energy, and the starting winding and the holding winding flow holding current, so that the movable iron core and the static iron core of the contactor continue to be attracted until the contactor is in a complete attraction state, and the starting current during starting is switched to the holding current time period to be limited in a very small range through introducing the position switch, so that the difficult problem in the smooth transition of converting the electromagnet from the starting state to the holding state is perfectly solved under the cooperation of the components.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a circuit diagram of a contactor according to an embodiment;

FIG. 2 is an assembly view of the contactor of the embodiment of FIG. 1;

FIG. 3 is a start-up process of the windings of the contactor of the embodiment of FIG. 1;

FIG. 4 is a state of the hold winding of the contactor of the embodiment of FIG. 1 in normal operation;

FIG. 5 is a schematic view of the embodiment of FIG. 1 in a transient state transitioning from an active state to a hold state;

fig. 6 is a schematic view of the state of current change during transient state transition from the start-up state to the hold state of the contactor of the embodiment of fig. 1.

Reference numerals illustrate:

① . Rectifier circuit ②, filter energy storage device ③, start winding ④, hold winding ⑤, position switch ⑥, unidirectional conduction device ⑦, movable iron core ⑧, static iron core ⑨, return spring ⑩, and normally open contact A trigger head.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

The application provides a contactor, which is combined with fig. 1 and 2, wherein fig. 1 is a circuit diagram of the contactor in an embodiment; fig. 2 is an assembled view of the contactor of the embodiment of fig. 1, the contactor including a movable core ⑦, a stationary core ⑧, a rectifying and filtering circuit, a position switch ⑤, a start winding ③, a hold winding ④, and a unidirectional current conducting device ⑥, wherein a first end and a second end of the rectifying and filtering circuit terminate an external alternating current; the first end of the position switch ⑤ is connected with the third end of the rectifying and filtering circuit, and the second end of the position switch ⑤ is connected with the fourth end of the rectifying and filtering circuit; the first end of the starting winding ③ is connected with the fifth end of the rectifying and filtering circuit, and the second end is connected with the first end of the position switch ⑤ and is coupled with the movable iron core ⑦ and the static iron core ⑧; the first end of the hold winding ④ is connected to the second end of the start winding ③, which is connected to the second end of the rectifying and filtering circuit through the unidirectional current-carrying device ⑥, and is coupled to the movable core ⑦ and the stationary core ⑧.

According to the application, only the rectifying and filtering circuit, the position switch ⑤, the starting winding ③, the holding winding ④ and the unidirectional conduction device ⑥ are added, the original electromagnet winding is removed, the number and the volume of newly added parts are controlled, and the possibility of upgrading and reforming the traditional product is facilitated, so that the whole process and the structure of the newly designed energy-saving alternating current contactor are very simplified, the device volume is very compact, and the device is very suitable for updating various related products. The novel product has very ideal effects on energy conservation, operation and the like, and reaches the first-level energy consumption standard in the new national standard (GB 21518-2022, an energy efficiency limit value and an energy efficiency grade of an alternating-current contactor). The novel contactor solves various difficulties in modifying the traditional contactor into energy-saving type, and has the effects of simplification, miniaturization, light weight and energy conservation. And all the newly added elements have the characteristic of high-reliability operation. Meanwhile, because the service life of the energy-saving alternating current contactor is greatly prolonged, a great amount of raw material consumption is saved for society.

In practical application, when the contactor is started, the position switch ⑤ is closed, and a starting current flows through the starting winding ③, so that the movable iron core ⑦ and the static iron core ⑧ of the contactor start to be attracted, and the filtering energy storage device ② in the rectifying and filtering circuit stores energy. With specific reference to fig. 3, fig. 3 illustrates the start-up process of the windings of the contactor of the embodiment of fig. 1, wherein the direction of current flow is indicated by the arrows. The function of the rectification filter circuit can obtain the maximum starting voltage under the condition that the external power supply and the whole mechanism are unchanged, and then the maximum starting current (Iq) is obtained, so that the enough exciting current for starting the electromagnet is met, and the electromagnet in the contactor can be smoothly started to attract.

During the attraction of the movable core ⑦ and the stationary core ⑧, fig. 5 and 6 are combined, wherein fig. 5 is a schematic view of the embodiment of fig. 1 in which the start-up state of the contactor transitions to the hold-up state; fig. 6 is a schematic diagram of a current change state during a transient state of the contactor in the embodiment shown in fig. 1, in which the start-up state transitions to the hold state, the position switch ⑤ is opened, the energy is released from the filter energy storage device ② in the rectifying and filtering circuit, and a hold current flows through the start winding ③ and the hold winding ④, so that the movable core ⑦ and the stationary core ⑧ of the contactor continue to be attracted until the state is completely attracted.

Specifically, the position switch ⑤ in the present embodiment plays a plurality of key roles in the circuit, firstly, when the starting current (Iq) starts the moving iron core ⑦ to move to a distance less than or equal to 1.5mm from the static iron core ⑧, the position switch ⑤ is moved by the trigger head of the following iron core ⑦The top is opened, at this time, the electric energy stored in the filtering energy storage device ②, i.e. the filtering energy storage capacitor and the starting winding ③ form a discharge loop, the loop current (Ic) is released, the Ic continuously maintains the exciting current in the starting winding ③, the electromagnet movable iron core ⑦ continuously moves towards the static iron core ⑧ under the action of electromagnetic force, when the air gap tends to 0 from 1.5mm, the exciting current (Ic) released by the filtering energy storage device ② continuously maintains the exciting current of the starting winding ③ continuously, so that the starting exciting energy is basically unchanged, until the movable iron core ⑦ and the static iron core ⑧ are in a complete attraction state, at this time, the exciting force of the holding current (Ib) completely meets the attraction force of the electromagnet in a normal attraction operation state, and the contactor electromagnet enters a normal operation state.

Fig. 4 shows the state of the holding winding ④ of the contactor of the embodiment shown in fig. 1 in normal operation, in this embodiment, the contactor electromagnet is in a fully attracted state, and the direction of current flow in the normal operation state is filtered by the energy storage device ②. At this time, the holding current (Ib) of the winding passes through the rectifying circuit ①, the starting winding ③, the holding winding ④ and the unidirectional conduction device ⑥, and the attraction of the electromagnet is maintained by the low voltage and the low current obtained by half-wave rectification of the whole load loop, so that the purposes of direct current silence, low power consumption and energy saving are realized.

The contactor further comprises a return spring ⑨ and a normally open contact ⑩, wherein under the action of the return spring ⑨, the movable iron core ⑦ and the static iron core ⑧ are pulled apart, and the normally open contact ⑩ is in an open state. When the subsequent return spring ⑨ is reset, the movable iron core ⑦ is pulled to be separated from the stationary iron core ⑧, and the normally open contact ⑩ is in an open state.

In the above embodiment, only the rectifying and smoothing circuit, the position switch ⑤, the start winding ③, the hold winding ④ and the unidirectional current-conducting device ⑥ are cited, Therefore, components are reduced, the structure is simple and miniaturized, the components have high-reliability operation characteristics, and meanwhile, the service life of the contactor is greatly prolonged, a large amount of raw material loss is saved for society, and the cost is reduced. When the contactor is started, the position switch ⑤ is closed, and a starting current flows through the starting winding ③, so that the movable iron core ⑦ and the static iron core ⑧ of the contactor start to be attracted, and the filtering energy storage device ② stores energy; During the attraction of the movable core ⑦ and the stationary core ⑧, the position switch ⑤ is opened, the filter energy storage device ② releases energy, A holding current flows through the start winding ③ and the holding winding ④, so that the movable iron core ⑦ and the stationary iron core ⑧ of the contactor continue to be attracted, The starting current is switched to the holding current time period in a very small range by introducing the position switch ⑤ until the electromagnet is in a complete suction state, so that the difficulty in smooth transition of the electromagnet from the starting state to the holding state is perfectly solved under the cooperation of the components, and seamless connection is realized.

In one of the alternative embodiments, the rectifying and filtering circuit includes: the rectification circuit ① is connected with external alternating current at a first end and a second end, and a fourth end is connected with a second end of the position switch ⑤; the first end of the filter energy storage device ② is connected to the third section of the rectifying circuit ①, and the second end is connected to the first end of the position switch ⑤.

In one alternative embodiment, the rectifying circuit ① is a bridge rectified current. The rectifying circuit ① is a full-bridge rectifier, and is provided with a first input pole and a second input pole for connecting an ac input power source Vin, and a first output pole and a second output pole for outputting a dc power Vout. The full bridge rectifier is used for converting alternating current into direct current. The full bridge rectifier includes 4 diodes connected end to end: diode D1, diode D2, diode D3, and diode D4. The anode of the diode D1 is connected to the cathode of the diode D4, the anode of the diode D2 is connected to the cathode of the diode D3, the cathode of the diode D1 is connected to the cathode of the diode D2, and the anode of the diode D3 and the anode of the diode D4 are connected.

The common connection point of the diode D1 and the diode D4 is used as a first input pole of the input power source Vin, and the common connection point of the diode D2 and the diode D3 is used as a second input pole of the input power source Vin. The common connection point of the diode D1 and the diode D2 is used as a first input pole outputting the direct current Vout, and the common connection point of the diode D3 and the diode D4 is used as a second input pole outputting the direct current Vout.

In the positive half cycle of the ac input power Vin, the diode D1 and the diode D3 are turned on, the diode D2 and the diode D4 are turned off, and the current enters from the first input electrode, flows through the diode D1 to reach the first output electrode, flows through the load RL to reach the second output electrode, and flows through the diode D3 to reach the second input electrode. In the negative half cycle of the ac input power Vin, the diode D1 and the diode D3 are turned off, the diode D2 and the diode D4 are turned on, and the current enters from the second input electrode, flows through the diode D2 to reach the first output electrode, flows through the load RL to reach the second output electrode, and flows through the diode D4 to reach the first input electrode. Thus, half cycle signals are always output at the DC voltage output. In theory, vout=0.9 Vin.

The filtering energy storage device ② is located in the filtering loop, and can filter the received direct current to prevent the impurity interference signal from interfering the driving signal. Specifically, the filter circuit includes a passive filter circuit and an active filter circuit. The passive filter circuit can be composed of passive elements (resistor, capacitor and inductor), and the main forms of the passive filter circuit are capacitive filter, inductive filter and duplex filter (including inverted L-shaped filter, LC pi-shaped filter, RC pi-shaped filter and the like). The active filter circuit may also consist of active elements (bipolar, unipolar, integrated op-amp), the main form of which is active RC filtering. In one alternative embodiment, passive components are used for filtering and storing energy, and the filtering and storing device ② is a capacitor. In one alternative embodiment, the capacitance is less than a predetermined value. The problem that the starting exciting current drops too much before the air gap of the electromagnet is 0 in the conversion process is solved by only adding a smaller energy storage capacitor, and smooth attraction of the electromagnet of the contactor is ensured.

When the contactor is started, the rectification circuit ① rectifies external alternating current to obtain a starting voltage, so that a starting current flows through the starting winding ③.

In one embodiment, the contactor further comprises: trigger headThe trigger head/>The following iron core ⑦ moves, and the position switch ⑤ is triggered during the attraction process of the moving iron core ⑦ and the static iron core ⑧And (5) pushing open. When the position switch ⑤ is turned on, the rectifier circuit ① outputs half-wave rectified voltage, so that holding current flows in the starting winding ③ and the holding winding ④, meanwhile, because the position switch ⑤ is turned off, the power supply mode of the bridge rectifier circuit ① and the capacitor filter when the contactor electromagnet is started is converted into the power supply mode of the half-wave rectified power supply, the voltage in the electromagnet power supply loop is greatly reduced, and the internal resistance of the starting winding ③ is smaller than that of the holding winding ④, so that the starting winding ③ with the internal resistance of only hundreds of ohms is connected in series with the holding winding ④ with the internal resistance of thousands of ohms when the excitation loop is started, the internal resistance of the whole excitation winding is greatly increased, the loop current of the electromagnet winding is greatly reduced, which is hundreds of times lower than the current when the contactor electromagnet is started, and the power consumption of the contactor electromagnet is greatly reduced, and the purpose of saving energy is achieved.

In the above embodiment, the circuit is skillfully designed to increase the starting voltage (increase the starting current) by rectifying and filtering with a capacitor and simultaneously has an energy storage scheme, the starting exciting current is supplemented by a method of discharging a capacitor and a starting winding ③ loop, and meanwhile, under the cooperation of an air gap position switch ⑤, the problem that the current in the starting winding ③ is switched from starting to maintaining instant is basically solved, and the problem is similar to seamless connection.

In one alternative embodiment, unidirectional conductive device ⑥ is a diode. The reasonable design of the position switch ⑤ and the unidirectional conduction device ⑥ ensures that when the air gap position switch ⑤ is opened, the power supply loop of the rectifying circuit and the capacitor filtering (high voltage) is switched to the half-wave rectifying (low voltage) power supply loop, the voltage in the electromagnet power supply loop is greatly reduced, and the starting winding ③ with the internal resistance of only hundreds of ohms is connected in series with the holding winding ④ with the internal resistance of thousands of ohms when the exciting loop is started, so that the internal resistance of the whole exciting winding is greatly increased, the current of the winding loop of the electromagnet is greatly reduced by hundreds of times, the power consumption of the electromagnet of the contactor is greatly reduced, and the energy saving purpose is achieved.

The contactor of the application perfectly solves the difficult problem of the stable transition of the electromagnet from the starting state to the holding state by perfectly conception and reasonable combination of the bridge rectifier circuit ①, the filter energy storage device ②, the starting winding ③, the holding winding ④, the position switch ⑤ and the unidirectional conduction element under the cooperation of the components, and realizes seamless connection.

The application also designs, tests and assembles several finished product prototypes on the traditional alternating current contactor. The samples can save more than 80% of energy compared with the traditional AC contactor, and the new samples can compare with the high-reliability operation characteristics of the traditional product, thereby not only saving energy compared with the traditional product, but also prolonging the service life of the contactor.

Further: the application uses direct current to excite from starting to keeping normal operation, eliminates eddy current loss and hysteresis loss of iron core caused by alternating current magnetization. Under the condition that the short circuit ring is not used, the vibration and noise of the iron core are eliminated, and the energy consumed by the short circuit ring part is also saved. The research shows that compared with the traditional alternating current contactor, the contactor disclosed by the application has the energy-saving effect of more than 80%. The power consumed for a large and medium capacity ac contactor during the hold phase is typically between tens to hundreds of watts. The conventional ac contactor of a CJ20-630 consumes approximately 360kw of electricity per year, calculated as 8 hours of operation per day for 360 days per year.

Meanwhile, the use quantity of large and medium-sized capacity alternating current contactors is over tens of millions to one hundred million from the national perspective, the quantity is continuously increased, and the total annual energy consumption is quite huge. In recent years, the development of industrial economy is continuous, and the increasing demand of electric power is leading to the increasingly prominent contradiction between supply and demand of electric power. Meanwhile, china is used as a large resource consumption country, and advocating energy conservation is a necessary trend. The economic growth mode starts to change from the original rough economic growth mode to the intensive economic mode.

In addition, the application also provides electrical equipment comprising the contactor in any one of the embodiments. The electrical devices may include, but are not limited to, various types of terminal electrical devices such as motors, transformers, lighting appliances, and the like, which are common in everyday life.

In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A contactor, includes movable core and quiet iron core, its characterized in that still includes:

The first end and the second end of the rectifying and filtering circuit are connected with external alternating current;

the first end of the position switch is connected with the third end of the rectifying and filtering circuit, and the second end of the position switch is connected with the fourth end of the rectifying and filtering circuit;

A start winding, a first end of which is connected with a fifth end of the rectifying and filtering circuit, and a second end of which is connected with a first end of the position switch and is coupled with the movable iron core and the static iron core;

a holding winding, wherein a first end of the holding winding is connected with a second end of the starting winding, and the second end of the holding winding is connected with a second end of the rectifying and filtering circuit through a unidirectional conduction device and is coupled with the movable iron core and the static iron core;

When the contactor is started, the position switch is closed, starting current flows through the starting winding, so that the movable iron core and the static iron core of the contactor are started to be attracted, and a filtering energy storage device in the rectifying and filtering circuit stores energy;

In the attraction process of the movable iron core and the static iron core, the position switch is opened, the filtering energy storage device releases energy, and a holding current flows in the starting winding and the holding winding, so that the movable iron core and the static iron core of the contactor continue to be attracted until the contactor is in a complete attraction state.

2. The contactor according to claim 1, wherein said rectifying and filtering circuit comprises:

The first end and the second end of the rectifying circuit are connected with external alternating current, and the fourth end of the rectifying circuit is connected with the second end of the position switch;

the first end of the filtering energy storage device is connected with the third section of the rectifying circuit, and the second end of the filtering energy storage device is connected with the first end of the position switch;

When the contactor is started, the rectification circuit rectifies external alternating current to obtain starting voltage, so that starting current flows through the starting winding;

when the position switch is turned on, the rectifying circuit outputs a half-wave rectified voltage so that a holding current flows in the start winding and the holding winding.

3. The contactor according to claim 2, further comprising:

the trigger head moves along with the movable iron core, and in the attraction process of the movable iron core and the static iron core, the position switch is pushed open by the trigger head.

4. A contactor according to claim 3, wherein the internal resistance of said start winding is less than the internal resistance of said hold winding.

5. The contactor according to any of claims 2 to 4, wherein said rectifying circuit is a bridge rectifying current.

6. The contactor according to any of claims 2 to 4, wherein said filter energy storage device is a capacitor.

7. The contactor according to claim 6, wherein the capacitance is less than a predetermined value.

8. The contactor according to any of claims 2 to 4, wherein said unidirectional conducting devices are diodes.

9. The contactor of claim 3, further comprising a return spring and a normally open contact, wherein said movable core is pulled away from said stationary core by said return spring and said normally open contact is in an open state.

10. An electrical apparatus comprising the contactor of any one of claims 1 to 9.