Magnetic circuit system with low coil power consumption and high-voltage direct current contactor

Abstract

The utility model relates to the technical field of contactors, in particular to a magnetic circuit system with low coil power consumption and a high-voltage direct-current contactor, the magnetic circuit system comprises a static assembly part and a movable assembly part, and the magnetic circuit design is optimized by additionally arranging structures such as a coil, a U-shaped yoke, a magnetic conductive cylinder, magnetic steel and a static iron core. Specifically, the special polarity design and position layout of the magnetic steel are combined with the cooperation of the static iron core and the magnetic conductive cylinder, so that the electromagnetic attraction force is greatly improved, the contactor can complete the attraction and release of the contacts in a short time, the working reliability is remarkably improved, the magnetic field energy is effectively concentrated, and the energy input required by the coil is reduced. And the coil driving power consumption is reduced while the strong electromagnetic attraction is realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of contactors, in particular to a magnetic circuit system with low coil power consumption and a high-voltage direct-current contactor. BACKGROUND

[0002] A contactor is an electronic control device with a control system (also known as an input circuit) and a controlled system (also known as an output circuit), which is usually applied in an automatic control circuit. It is actually a kind of "automatic switch" that uses a small current to control a large current. Therefore, it plays a role of automatic regulation, safety protection, and circuit conversion in the circuit. A high-voltage direct-current contactor is a contactor with the ability to handle high power. It has unmatched reliability and long service life under harsh conditions such as high voltage and large current, and is widely used in various fields, such as the new energy vehicle field. The high-voltage direct-current contactor is concerned because it can handle high power and maintain reliability and long life in a high-voltage, high-current environment. In recent years, with the rapid development and technological progress of the new energy vehicle industry, the demand for high-voltage direct-current contactors continues to grow, and it has gradually become one of the core components to ensure the stable operation of the vehicle electrical system.

[0003] The inside of the contactor is composed of a coil and a metal contact. The coil realizes the conversion of electric energy into magnetic energy, attracts the metal contact, and achieves the purpose of closing the contact. When the input quantity in the circuit meets the preset conduction condition, the metal contact in the contactor is attracted, the internal circuit of the contactor is closed, and the circuit to which the contactor is applied shows an attracted conduction state. When the input quantity in the circuit meets the preset off condition, the metal contact in the contactor is separated, the internal circuit of the contactor is broken, and the circuit to which the contactor is applied shows a release off state.

[0004] However, the main problem existing in the prior art is that it is difficult to balance the strong electromagnetic attraction and the low power consumption characteristics. On the one hand, in order to ensure sufficient short-circuit resistance, a larger coil volume and higher driving power consumption are often required. On the other hand, in the pursuit of lightweight and energy-saving and consumption-reducing goals, it is desired to reduce the coil size and energy loss as much as possible. This contradiction makes it a technical problem to be solved how to realize fast attraction conduction or release off in a limited coil winding space to reduce the coil power consumption. CONTENT OF THE INVENTION

[0005] In order to overcome the above technical problems, the purpose of the application is to provide a magnetic circuit system with low coil power consumption and a high-voltage direct-current contactor.

[0006] In a first aspect, the magnetic circuit system with low coil power consumption provided by the application adopts the following technical scheme:

[0007] The application discloses a magnetic circuit system with low coil power consumption, which comprises a static component part and a dynamic component part, the static component part is provided with a group of symmetrically distributed static contacts, the dynamic component part comprises a push rod assembly, a yoke plate, a small spring, a dynamic iron core and a metal shell, one end of the push rod assembly is provided with a dynamic spring sheet, the end of the push rod assembly away from the dynamic spring sheet penetrates through the yoke plate, the small spring is arranged on the push rod assembly and abuts against the yoke plate, the dynamic iron core is screwed on the push rod assembly and abuts against the end of the small spring away from the yoke plate, the metal shell is arranged on the outer periphery of the dynamic iron core and is fixed on the yoke plate, the static component is arranged on the outer periphery of the push rod assembly and is fixed on the yoke plate, and the static contacts are oppositely arranged with the dynamic spring sheet, further comprising a coil, a U-shaped yoke, a magnetic conducting cylinder, a magnetic steel and a static iron core, the static iron core is riveted on one end of the U-shaped yoke towards the yoke plate, the U-shaped yoke is located on one side of the dynamic iron core and is riveted on the yoke plate, the magnetic steel is arranged on the static iron core, the magnetic conducting cylinder abuts against the magnetic steel, the magnetic steel is located between the static iron core and the magnetic conducting cylinder, one side of the magnetic steel towards the magnetic conducting cylinder is N-pole, and one side of the magnetic steel towards the static iron core is S-pole, the coil is arranged on the circumferential side of the magnetic conducting cylinder, and the metal shell is inserted into the magnetic conducting cylinder.

[0008] By adopting the technical scheme, the special polarity design and position layout of the magnetic steel can significantly enhance the magnetic field strength, thereby improving the action sensitivity of the dynamic iron core, and improving the electromagnetic attraction force; when the coil is electrified, the generated magnetic field interacts with the permanent magnetic field of the magnetic steel, thereby further enhancing the attraction force on the dynamic iron core, and prompting the dynamic spring sheet to quickly complete the attraction action with the static contact; when the coil is de-energized, due to the particularity of the magnetic circuit design, the dynamic iron core can return to the initial position more quickly, so that the dynamic spring sheet is separated from the static contact in time, and the accelerated release of the contactor contact is realized; the design scheme fully utilizes the limited space, effectively reduces the required driving power consumption of the coil, thereby shortens the response time, and meets the requirements of miniaturization and high efficiency.

[0009] Optionally, one side of the static iron core towards the magnetic conducting cylinder is provided with a first boss, a first through hole is formed in the magnetic steel, when the magnetic steel is arranged on the static iron core, the first boss is matched with the first through hole, and the height of the first boss is higher than the end face of the magnetic steel towards the magnetic conducting cylinder.

[0010] By adopting the technical scheme, the cooperation of the first boss and the first through hole can accurately limit the installation position of the magnetic steel in the axial direction of the coil, and ensure the stable assembly between the magnetic steel and the static iron core. Meanwhile, since the height of the first boss is higher than the end face of the magnetic steel facing the magnetic cylinder, when the coil is powered on, the first boss can guide the magnetic circuit to be transmitted more concentratedly, thereby improving the magnetic field strength and the attraction force, and accelerating the attraction speed of the contactor contact point; when the coil is powered off, the structure helps to quickly change the magnetic circuit path, promotes the reset of the moving iron core, and realizes the rapid release.

[0011] Optionally, when the coil is powered on, the moving iron core pushes the push rod assembly to drive the moving spring plate to attract the static contact, at this time, the moving iron core is displaced in the direction of the push rod assembly; when the distance between the moving iron core and the yoke plate is less than the distance between the moving iron core and the static iron core, the magnetic circuit direction of the magnetic steel sequentially passes through the moving iron core, the yoke plate, the U-shaped yoke, and the static iron core.

[0012] By adopting the technical scheme, when the coil is powered on, the moving iron core pushes the push rod assembly to drive the moving spring plate to attract the static contact, thereby realizing the rapid attraction conduction of the contactor. In this process, the moving iron core is displaced in the direction of the push rod assembly, so that the distance between the moving iron core and the yoke plate is less than the distance between the moving iron core and the static iron core, thereby changing the magnetic circuit path of the magnetic steel. The magnetic circuit direction sequentially passes through the moving iron core, the yoke plate, the U-shaped yoke, and the static iron core, thereby optimizing the magnetic field distribution, enhancing the electromagnetic attraction force, and further improving the attraction speed and reliability. The design effectively reduces the energy consumption in the attraction process, and improves the overall performance of the high-voltage direct-current contactor.

[0013] Optionally, when the coil is powered off, the moving iron core pushes the push rod to drive the moving spring plate to separate from the static contact, at this time, the moving iron core is offset in the direction of the static iron core, and when the distance between the moving iron core and the yoke plate is greater than the distance between the moving iron core and the static iron core, the magnetic circuit direction of the magnetic steel sequentially passes through the moving iron core and the first boss.

[0014] By adopting the technical scheme, when the coil is powered off, the moving iron core is reset under the action of the small spring, drives the push rod to separate the moving spring plate from the static contact, thereby realizing the rapid disconnection of the circuit. In this process, since the magnetic circuit direction of the magnetic steel is adjusted to sequentially pass through the moving iron core and the first boss, the magnetic field distribution is changed, the reset driving force of the moving iron core is further enhanced, the efficiency and reliability of the release process are improved, and the influence of the residual magnetic force on the action stability is effectively reduced.

[0015] Optionally, a gap is reserved between the first boss and the metal shell.

[0016] By adopting the above technical scheme, the gap reserved between the first boss and the metal shell can ensure that the magnetic circuit part will not produce unnecessary friction or interference due to excessive contact between parts during assembly, thereby guaranteeing the stability and reliability of the overall structure. At the same time, this design also helps to optimize the internal space layout, so that the yoke plate can be more closely fitted on the coil, further enhancing the electromagnetic conversion efficiency and reducing energy loss.

[0017] Optionally, the static core is provided with a second boss at one end of the U-shaped yoke, a second through hole is formed on the U-shaped yoke, the second boss is crimped in the second through hole, and the second boss and the second through hole are in interference fit.

[0018] By adopting the above technical scheme, the connection between the static core and the U-shaped yoke is more stable and reliable. Specifically, the interference fit design of the second boss and the second through hole effectively increases the contact area and mechanical strength between the two, thereby enhancing the stability of the entire magnetic circuit structure and avoiding loosening due to vibration or impact. This improvement helps to ensure the performance consistency of the contactor during long-term use, especially in the working state of high-frequency attraction and release, which can significantly improve the application reliability.

[0019] Optionally, the magnetic conducting cylinder, the magnetic steel and the static core have the same outer diameter, the center of the coil is provided with a third through hole and a fourth through hole, the third through hole and the fourth through hole are communicated, the inner diameter of the third through hole is larger than that of the fourth through hole, a third boss is formed between the third through hole and the fourth through hole, the magnetic conducting cylinder, the magnetic steel and the static core are jointly inserted into the third through hole, the magnetic conducting cylinder abuts on the third boss, and the metal shell is inserted into the magnetic conducting cylinder through the fourth through hole.

[0020] By adopting the above technical scheme, the outer diameters of the magnetic conducting cylinder, the magnetic steel and the static core are kept consistent, which can ensure accurate alignment of the three during assembly, thereby improving the overall efficiency of the magnetic circuit. The third through hole and the fourth through hole designed in the center of the coil not only realize reasonable layout in structure, but also further optimize the assembly precision and stability between parts through the setting of the third boss. The metal shell is inserted into the magnetic conducting cylinder through the fourth through hole, which effectively enhances the space utilization of the entire device, reduces unnecessary volume occupation, makes the high-voltage direct-current contactor more compact and portable, and meets the requirements of modern equipment for miniaturization. This design scheme cleverly balances the relationship between magnetic field strength and component size, ensures strong electromagnetic attraction force, significantly reduces manufacturing cost and improves product reliability.

[0021] Optionally, a convex bracket is arranged on one side of the coil towards the yoke plate, and a limiting strip is arranged on the other side of the coil towards the yoke plate, when the coil is assembled, the limiting strip is parallel to the yoke plate and is attached to the side edge of the yoke plate, and the convex bracket is attached to the yoke plate.

[0022] By adopting the above technical scheme, the limiting strip is attached to the side edge of the yoke plate and is parallel to the yoke plate, which effectively prevents the coil from rotating or deviating, and ensures the accuracy of the installation position; the convex bracket is attached to the yoke plate, which further limits the movement of the coil in the vertical direction, thereby improving the stability of the entire structure. This design not only simplifies the assembly process, but also improves the reliability and consistency of the product.

[0023] Optionally, a transient voltage suppression diode is further included, an outgoing pin is arranged on the coil, and the outgoing pin is connected to the transient voltage suppression diode.

[0024] By adopting the above technical scheme, the transient voltage suppression diode can effectively absorb the reverse electromotive force generated by the coil in the instant of disconnection, avoiding damage to other elements of the circuit caused by high voltage, thereby improving the reliability and safety of the entire high-voltage direct-current contactor.

[0025] In a second aspect, the application provides a high-voltage direct-current contactor.

[0026] The high-voltage direct-current contactor provided by the application comprises the magnetic circuit system with low coil power consumption described above.

[0027] In summary, the application includes at least one of the following beneficial effects:

[0028] 1. The special polarity design of the magnetic steel in combination with the static iron core and the magnetic guide cylinder improves the electromagnetic attraction force, enables the contactor to complete the attraction and release of the contact in a short time, significantly improves the working reliability, effectively concentrates the magnetic field energy, reduces the energy input required by the coil, and reduces the coil driving power consumption while achieving strong electromagnetic attraction;

[0029] 2. The reasonable space layout and component integration method minimize the overall volume, meet the miniaturization requirements of the high-voltage direct-current contactor, and adapt to the application requirements of narrow installation environment. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure of embodiment 1 of the application;

[0031] Figure 2 is a sectional view of embodiment 1 of the application;

[0032] Figure 3 is an exploded view of embodiment 1 of the application;

[0033] Figure 4 is a schematic diagram of the magnetic path direction when the moving iron core is attracted upward when the coil of the embodiment 1 of the present application is energized;

[0034] Figure 5 is a schematic diagram of the magnetic path direction when the moving iron core is released downward when the coil of the embodiment 1 of the present application is de-energized;

[0035] Figure 6 is a schematic diagram of the overall structure of the embodiment 2 of the present application.

[0036] Explanation of reference numerals:

[0037] 1, stationary contact; 2, push rod assembly; 3, yoke plate; 4, small spring; 5, moving iron core; 6, metal shell; 7, moving spring plate; 8, coil; 81, third through hole; 82, fourth through hole; 83, third boss; 84, convex petiole; 85, limiting strip; 9, U-shaped yoke; 91, second through hole; 10, magnetic conducting cylinder; 11, magnetic steel; 111, first through hole; 12, stationary iron core; 121, first boss; 122, second boss; 13, transient voltage suppression diode. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The present application can be embodied in various different forms, and is not limited to the embodiments described here.

[0039] In the description of the present application, the expressions of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics expressed in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics expressed can be combined in any one or more embodiments or examples in a suitable manner.

[0040] Unless otherwise defined, 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 is for the purpose of describing the specific embodiments only and is not intended to be limiting of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected; it can also be detachably connected; or it can be integrated; or it can be mechanically connected. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] Some embodiments of the present application will be described in detail with reference to the drawings. Those skilled in the art can combine and combine the different embodiments or examples expressed in the present application and the features of the different embodiments or examples without conflict.

[0043] Embodiment 1: A magnetic circuit system with low coil power consumption, referring to Figure 1 and Figure 2 , including static component part and dynamic component part, the static component part includes symmetrically distributed static contact 1. The dynamic component part includes push rod assembly 2, yoke plate 3, small spring 4, moving iron core 5 and metal shell 6, one end of push rod assembly 2 is fixed with moving spring 7, the other end passes through the center of yoke plate 3, small spring 4 is sleeved on push rod assembly 2 and abuts against yoke plate 3, moving iron core 5 is connected to the end of push rod assembly 2 by thread and presses small spring 4, metal shell 6 is sleeved on the outer periphery of moving iron core 5 and is laser welded on yoke plate 3, static component part is sleeved on the outer periphery of push rod assembly 2, and static component and yoke plate 3 are fixed by laser welding, static contact 1 and moving spring 7 are arranged horizontally opposite.

[0044] Referring to Figure 2 and Figure 3 , the magnetic circuit part further comprises coil 8, U-shaped yoke, magnetic conducting cylinder 10, magnetic steel 11 and static iron core 12, static iron core 12 is riveted to the side of U-shaped yoke facing moving iron core 5 and located at the center. The magnetic steel 11 is sleeved on the static iron core 12, the magnetic conducting cylinder 10 is pressed on the magnetic steel 11, the magnetic steel 11 is made of neodymium iron boron material, the side facing the magnetic conducting cylinder 10 is N pole, and the side facing the static iron core 12 is S pole, the coil 8 is sleeved on the outer periphery of the magnetic conducting cylinder 10, and the metal shell 6 is inserted into the inner cavity of the magnetic conducting cylinder 10.

[0045] Specifically, the side of the static iron core 12 facing the magnetic conducting cylinder 10 is provided with a first boss 121, and the magnetic steel 11 is provided with a first through hole 111 matched with the first boss 121. When the magnetic steel 11 is sleeved on the static iron core 12, the first boss 121 is matched with the first through hole 111, and the cooperation of the first boss 121 and the first through hole 111 can accurately limit the installation position of the magnetic steel 11 in the axial direction of the coil 8, and ensure the stable assembly between the magnetic steel 11 and the static iron core 12. At the same time, the height of the first boss 121 is higher than the end face of the magnetic steel 11 facing the magnetic conducting cylinder 10. When the coil 8 is energized, the first boss 121 can guide the magnetic circuit to transmit more concentratedly, thereby improving the magnetic field strength and the attraction force, and accelerating the attraction speed of the contactor contact; when the coil 8 is de-energized, this structure helps to quickly change the magnetic circuit path, promotes the reset of the moving iron core 5, and realizes rapid release.

[0046] Meanwhile, the second boss 122 is arranged at one end of the U-shaped yoke 9, and the second through hole 91 is arranged on the U-shaped yoke 9. The second boss 122 is in interference fit with the second through hole 91. The interference fit design of the second boss 122 and the second through hole 91 effectively improves the contact area and mechanical strength between the two, thereby enhancing the stability of the entire magnetic circuit structure and avoiding the loosening caused by vibration or impact. In order to further strengthen the riveting stability of the two, it is also possible to consider arranging a bract at the inner wall of the second through hole 91 of the U-shaped yoke. When the static iron core 12 is pressed into riveting, the riveting strength is further enhanced. After the static iron core 12 is pressed into riveting, the second boss 122 can also be extruded and expanded for riveting, which can improve the riveting strength of the two. The above improvement helps to ensure the performance consistency of the contactor during long-term use, especially in the working state of high-frequency attraction and release, which can significantly improve the application reliability.

[0047] In the embodiment, the outer diameters of the magnetic conducting cylinder 10, the magnetic steel 11 and the static iron core 12 are the same, the third through hole 81 and the fourth through hole 82 are arranged at the center of the coil 8, the third through hole 81 and the fourth through hole 82 are communicated, and the inner diameter of the third through hole 81 is larger than that of the fourth through hole 82, thereby forming a third boss 83. The magnetic conducting cylinder 10, the magnetic steel 11 and the static iron core 12 are inserted into the third through hole 81, thereby improving the overall efficiency of the magnetic circuit. The magnetic conducting cylinder 10 abuts against the third boss 83, thereby optimizing the assembly precision and stability between the components.

[0048] Specifically, the coil 8 is provided with a limiting strip 85 and a convex bract 84 on one side of the yoke plate 3. The limiting strip 85 is attached to and parallel with the side edge of the yoke plate 3, thereby effectively preventing the coil 8 from rotating or deviating and ensuring the accuracy of the installation position of the coil 8. The convex bract 84 abuts against the yoke plate 3, thereby further limiting the movement of the coil 8 in the vertical direction, thereby improving the stability of the entire structure. This design not only simplifies the assembly process, but also improves the reliability and consistency of the product.

[0049] It should be noted that the metal shell 6 is inserted into the magnetic conducting cylinder 10 through the fourth through hole 82, and a gap is reserved between the first boss 121 and the metal shell 6, which can ensure that the magnetic circuit part will not produce unnecessary friction or interference due to excessive contact between components during assembly, thereby ensuring the stability and reliability of the overall structure. At the same time, this design is also helpful to optimize the internal space layout, so that the yoke plate 3 can be more closely attached to the coil 8, thereby further enhancing the electromagnetic conversion efficiency and reducing energy loss.

[0050] Referring to Figure 4The attracting process (the coil 8 is energized) of the embodiment is as follows: when the coil 8 is energized, the moving iron core 5 pushes the push rod assembly 2 to drive the moving contact 7 to attract the static contact 1, so that the contactor is quickly attracted and turned on. In this process, when the distance between the moving iron core 5 and the yoke plate 3 is less than the distance between the moving iron core 5 and the static iron core 12, the magnetic path of the magnetic steel 11 is changed. The magnetic path direction is sequentially through the moving iron core 5, the yoke plate 3, the U-shaped yoke, and the static iron core 12, which optimizes the magnetic field distribution, enhances the electromagnetic attracting force, and further improves the attracting speed and reliability.

[0051] Referring to Figure 5 The releasing process (the coil 8 is de-energized) of the embodiment is as follows: when the coil 8 is de-energized, the moving iron core 5 is reset under the action of the small spring 4, drives the push rod to separate the moving contact 7 from the static contact 1, so that the circuit is quickly turned off. In this process, when the distance between the moving iron core 5 and the yoke plate 3 is greater than the distance between the moving iron core 5 and the static iron core 12, the magnetic path direction of the magnetic steel 11 is adjusted to sequentially pass through the moving iron core 5 and the first boss 121, so that the magnetic field distribution is changed, the reset driving force of the moving iron core 5 is further enhanced, the efficiency and reliability of the releasing process are improved, and the influence of the residual magnetic force on the action stability is effectively reduced.

[0052] It should be noted that, Figure 4 and Figure 5 The arrows in the magnetic circuit part in the drawings represent the magnetic path flowing direction of the magnetic circuit part, which flows out from the N pole of the magnetic steel 11 and finally flows into the S pole of the magnetic steel 11.

[0053] The implementation principle of the embodiment is as follows: the special polarity design and position layout of the magnetic steel 11 can significantly enhance the magnetic field strength, thereby improving the action sensitivity of the moving iron core 5, and thereby improving the electromagnetic attracting force; when the coil 8 is energized, the generated magnetic field interacts with the permanent magnetic field of the magnetic steel 11, further enhancing the attracting force on the moving iron core 5, prompting the moving contact 7 to quickly complete the attracting action with the static contact 1. When the coil 8 is de-energized, due to the uniqueness of the magnetic circuit design, the moving iron core 5 can return to the initial position more quickly, so that the moving contact 7 is separated from the static contact 1 in time, and the accelerated release of the contactor contact is realized; the design scheme fully utilizes the limited space, effectively reduces the coil driving power consumption required by the coil 8, and further shortens the response time, which meets the requirements of miniaturization and high efficiency.

[0054] The embodiment also discloses a high-voltage direct-current contactor, which comprises the magnetic circuit part described in the above embodiment.

[0055] Embodiment 2, referring to Figure 6The transient voltage suppression diode 13 is also included, and a lead-out pin is arranged on the coil 8 and connected to the transient voltage suppression diode 13 by soldering.

[0056] It should be noted that normal mechanical clearance tolerance is reserved between each part of the application, and no friction or interference will be caused in the action process, and each size meets the mechanical design parameters, and the specific matching tolerance value is not specifically described.

[0057] The embodiments of the specific embodiment are the preferred embodiments of the application, not limited to the protection scope of the application, wherein the same parts are represented by the same reference signs. Therefore: any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A magnetic circuit system with low coil power consumption, comprising a static component part and a moving component part, the static component part being provided with a set of symmetrically distributed static contacts (1), the moving component part comprising a push rod assembly (2), a yoke plate (3), a small spring (4), a moving iron core (5) and a metal shell (6), one end of the push rod assembly (2) being provided with a moving spring piece (7), the end of the push rod assembly (2) away from the moving spring piece (7) penetrating through the yoke plate (3), the small spring (4) being arranged on the push rod assembly (2) and abutting against the yoke plate (3), the moving iron core (5) being screwed on the push rod assembly (2) and abutting against the end of the small spring (4) away from the yoke plate (3), the metal shell (6) being sleeved on the outer periphery of the moving iron core (5) and fixed on the yoke plate (3), the static component being sleeved on the outer periphery of the push rod assembly (2) and fixed on the yoke plate (3), and the static contacts (1) and the moving spring piece (7) being oppositely arranged, characterized in that: Further comprise coil (8), U-shaped yoke (9), magnetic cylinder (10), magnetic steel (11) and static core (12), the static core (12) riveting in the U-shaped yoke (9) towards the yoke plate (3) one end, the U-shaped yoke (9) in the dynamic core (5) one side and riveting in the yoke plate (3), the magnetic steel (11) is set in the static core (12), the magnetic cylinder (10) is abutted in the magnetic steel (11), the magnetic steel (11) is located between the static core (12) and the magnetic cylinder (10), the magnetic steel (11) towards the magnetic cylinder (10) one side is N pole, the magnetic steel (11) towards the static core (12) one side is S pole, the coil (8) is set in the magnetic cylinder (10) circumferential side, the metal shell (6) is inserted in the magnetic cylinder (10) inside.

2. A magnetic circuit system with low coil power loss according to claim 1, characterized in that: The static core (12) towards the magnetic cylinder (10) one side is provided with first boss (121), the magnetic steel (11) is provided with first through hole (111), when the magnetic steel (11) is set in the static core (12), the first boss (121) is matched with the first through hole (111), and the height of the first boss (121) is higher than the end face of the magnetic steel (11) towards the magnetic cylinder (10).

3. A magnetic circuit system with low coil power loss according to claim 2, characterized in that: When the coil (8) is energized, the dynamic core (5) pushes the push rod assembly (2) and drives the dynamic spring sheet (7) and the static contact (1) to attract, at this time, the dynamic core (5) is displaced along the direction of the push rod assembly (2);When the distance between the dynamic core (5) and the yoke plate (3) is less than the distance between the dynamic core (5) and the static core (12), the magnetic circuit direction of the magnetic steel (11) passes through the dynamic core (5), the yoke plate (3), the U-shaped yoke and the static core (12) in turn.

4. The magnetic circuit system with low coil power loss according to claim 2, characterized in that: When the coil (8) is de-energized, the dynamic core (5) pushes the push rod and drives the dynamic spring sheet (7) and the static contact (1) to separate, at this time, the dynamic core (5) is offset along the direction of the static core (12), when the distance between the dynamic core (5) and the yoke plate (3) is greater than the distance between the dynamic core (5) and the static core (12), the magnetic circuit direction of the magnetic steel (11) passes through the dynamic core (5) and the first boss (121) in turn.

5. The magnetic circuit system with low coil power loss according to claim 2, characterized in that: The first boss (121) and the metal shell (6) are reserved with a gap.

6. The magnetic circuit system of claim 1, wherein: The static core (12) towards the U-shaped yoke (9) one end is provided with second boss (122), the U-shaped yoke (9) is provided with second through hole (91), the second boss (122) is crimped in the second through hole (91), and the second boss (122) and the second through hole (91) are interference fit.

7. The magnetic circuit system of claim 1, wherein: The outer diameter of the magnetic conducting cylinder (10), the magnetic steel (11) and the static iron core (12) is the same, the center of the coil (8) is provided with a third through hole (81) and a fourth through hole (82), the third through hole (81) and the fourth through hole (82) are communicated, the inner diameter of the third through hole (81) is larger than that of the fourth through hole (82), a third boss (83) is formed between the third through hole (81) and the fourth through hole (82), the magnetic conducting cylinder (10), the magnetic steel (11) and the static iron core (12) are jointly inserted into the third through hole (81) and the magnetic conducting cylinder (10) abuts on the third boss (83), and the metal shell (6) is inserted into the magnetic conducting cylinder (10) through the fourth through hole (82).

8. A magnetic circuit system with low coil power loss according to claim 7, characterized in that: The coil (8) is provided with a convex petiole (84) and a limiting strip (85) on one side of the yoke plate (3), when the coil (8) is assembled, the limiting strip (85) is parallel to the yoke plate (3) and is attached to the side edge of the yoke plate (3); the convex petiole (84) abuts on the yoke plate (3).

9. The magnetic circuit system of claim 1, wherein: A transient voltage suppression diode (13) is further included, the coil (8) is provided with a lead-out pin, and the lead-out pin is connected with the transient voltage suppression diode (13).

10. A high voltage DC contactor characterized by: The magnetic circuit system with low coil power consumption comprises the coil as claimed in any one of claims 1-9.

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