Motor type contact switch device

Abstract

A motor type contact switch device comprises a shell, a motor, a movable contact bridge assembly with two telescopic ends, a static contact and an elastic piece capable of generating torque. The movable contact bridge assembly is installed on a rotor shaft of the motor, and when the motor is powered on, the motor drives the movable contact bridge assembly to rotate, so that the movable contact bridge assembly is in conductive contact with the static contact, and meanwhile, the elastic piece generates torque; and when the motor is powered off, the movable contact bridge assembly resets under the torque action of the elastic piece and is separated from the conductive contact with the static contact. Coil driving is replaced by motor driving, and the moving contact is contacted with the static contact in a rotating mode instead of being released from the static contact in a linear displacement mode, so that the torque direction for driving the moving contact to rotate and the direction of electric repulsive force borne by the moving contact are not on the same plane, and the influence of the electric repulsive force on the rotation of the moving contact is reduced; the anti-short-circuit current capability is improved, and the service life and the safety of the DC contactor are improved.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, specifically to a motor-type contact switch device applicable in low-voltage power distribution, power control, electric vehicles, energy storage, photovoltaics, and other fields. Background Technology

[0002] A DC contactor is a control component. When the contactor coil is energized, the current flowing through the coil generates a magnetic field. The stationary iron core generates an electromagnetic force that drives the moving iron core and moving contacts, causing normally closed contacts to open and normally open contacts to close. When the coil is de-energized, the electromagnetic force disappears, and the moving iron core and moving contacts are released by the return spring, restoring the contacts to their original position. DC contactors control the coil to frequently connect and disconnect the DC main circuit. They feature large control capacity and remote operation capabilities, making them widely used in automatic control circuits.

[0003] In traditional DC contactors, a closed ceramic structure filled with high-pressure hydrogen is typically used to achieve rapid arc extinguishing. However, the small distance between the moving and stationary contacts makes arc extinguishing difficult and heat dissipation poor. When a short circuit occurs in the DC main circuit, a large electro-repulsive force is instantaneously generated between the moving and stationary contacts due to the short-circuit current. This electro-repulsive force is opposite to the electromagnetic attraction provided by the coil. When the short-circuit current in the main circuit is too large, the generated electro-repulsive force causes the contact spring to continue to compress, subsequently generating an arc in the contact air gap. This not only affects the quality and electrical life of the contacts but also doubles the pressure in the arc-extinguishing chamber, posing a risk of casing rupture. Simultaneously, the electro-repulsive force generated by the short-circuit current also puts pressure on the contact push rod and moving iron core. When the electromagnetic attraction provided by the coil is insufficient to maintain this pressure, it can lead to malfunctions and damage to the control coil, affecting the operation of the DC contactor.

[0004] Traditional DC contactors typically feature a directly connected moving contact bridge structure. During operation, this bridge moves vertically in a linear motion, requiring high flatness and levelness during installation. Insufficient levelness after installation can lead to a time difference in contact between the two points, potentially causing bounce and ultimately affecting the contactor's lifespan. Furthermore, the small distance between the moving and stationary contacts, coupled with the direction of the moving bridge's movement aligning with the coil's suction force, makes the contactor susceptible to malfunctions under vibration and impact. This can result in abnormal connection and disconnection, compromising the contactor's safety. Summary of the Invention

[0005] The purpose of this invention is to replace coil drive with motor drive, and to make the moving contact contact the stationary contact in a rotating manner instead of in a linear displacement manner. This makes the direction of the torque driving the moving contact to rotate and the direction of the electric repulsive force on the moving contact not in the same plane, thereby reducing the influence of the electric repulsive force on the rotation of the moving contact, improving the short-circuit current withstand capability, and improving the service life and safety of the DC contactor.

[0006] To achieve the above objectives, the present invention provides a motor-type contact switch device, comprising a housing, a motor, a contact system, and an elastic element capable of generating torque;

[0007] The contact system includes a moving contact bridge assembly and a stationary contact; the moving contact bridge assembly includes a moving contact bridge that is retractable at both ends, and the stationary contact is disposed on the housing on the outer periphery of the moving contact bridge assembly with an insulating gap;

[0008] One end of the elastic element is fixed to the housing, and the other end is fixedly connected to the moving contact bridge assembly; the motor is fixedly installed in the housing, and the rotor shaft of the motor is fixedly connected to the moving contact bridge assembly;

[0009] When the motor is not powered, the elastic element does not generate torque, and there is a phase angle between the moving contact bridge and the stationary contact, so that the moving contact bridge and the stationary contact are in an insulated interval.

[0010] When the motor is powered on, the rotor shaft of the motor drives the moving contact bridge assembly to rotate, and the two ends of the moving contact bridge make conductive contact with the two stationary contacts respectively. At the same time, the elastic element generates torque. When the motor is powered off, the moving contact bridge assembly resets under the torque of the elastic element and disengages from the conductive contact with the stationary contacts.

[0011] Preferably, the motor includes two stators and a rotor, with the two stators symmetrically arranged in the housing on the outer periphery of the rotor; the rotor includes a rotor shaft and a rotor winding assembly fixed on the rotor shaft, and the moving contact bridge assembly is fixedly arranged on the rotor shaft away from the rotor winding assembly; the rotor winding assembly includes several rotor laminations stacked on the rotor shaft, with a number of winding notches for winding coils evenly opened along the circumferential direction on the rotor laminations, and a winding skeleton formed between two adjacent winding notches, with two sets of winding coils wound on two winding skeletons symmetrically arranged on the rotor laminations.

[0012] Preferably, the stator has an arc-shaped curved structure, and two stators are symmetrically arranged on the inner wall of the housing on the outer periphery of the rotor; the rotor blades are coated with an insulating coating.

[0013] Preferably, the moving contact bridge assembly includes an insulated connecting frame and a moving contact bridge. The moving contact bridge includes two moving contacts, a conductive flexible connector, and a contact spring. The moving contacts are movably spaced on the connecting frame. One end of the contact spring is fixed to the connecting frame, and the other end is connected and fixed to the moving contact. One end of the moving contact extends out of the outer periphery of the connecting frame. The flexible connector connects the two moving contacts. The connecting frame is fixedly mounted on the rotor shaft of the motor, and one end of the elastic member is fixedly connected to the connecting frame. When conductive contact occurs, the rotor shaft of the motor rotates the connecting frame, causing the moving contact to make conductive contact with the stationary contact.

[0014] Preferably, the two stationary contacts are symmetrically arranged on opposite outer sides of the connecting frame. Two opposing sliding grooves are provided on the connecting frame, and the two moving contacts are slidably disposed in the sliding grooves. The moving contacts are connected to the connecting frame through contact springs disposed in the sliding grooves. When the contact system makes conductive contact, under the compression of the stationary contacts, the moving contacts move along the sliding grooves toward the center of the connecting frame, compressing the contact springs.

[0015] Preferably, one end of the moving contact facing the housing is located outside the connecting frame, and the other end is located in the slide groove. The end face of the moving contact located outside the connecting frame is an arc-shaped surface.

[0016] Preferably, a plurality of slit structures for extinguishing arcs are provided along the circumferential direction on the outer peripheral surface of the connecting frame and the corresponding inner wall of the housing.

[0017] Preferably, an annular permanent magnet structure is provided in the housing on the side where the stationary contact and the moving contact are in contact. The magnetic field of the permanent magnet structure can guide the electric arc generated by the contact system into the slit structure to extinguish the arc.

[0018] Preferably, the outer periphery of the annular permanent magnet structure is coated with a high-temperature resistant insulating material.

[0019] Preferably, the chamber containing the contact system is filled with an inert gas.

[0020] Preferably, the elastic element is a torsion spring.

[0021] Preferably, an elastic element base is fixedly disposed in the housing between the motor and the moving contact bridge assembly. The elastic element is mounted on the elastic element base, one end of the elastic element is fixedly connected to the elastic element base, and the other end is connected to the moving contact bridge assembly.

[0022] Preferably, the elastic element base is sleeved on the rotor shaft of the motor, and an annular groove is formed around the rotor shaft on one end face of the elastic element base facing the moving contact bridge assembly, and the elastic element is disposed in the annular groove.

[0023] Preferably, the permanent magnet structure is disposed between the elastic element base and the contact system.

[0024] This invention uses a motor to drive the moving contact bridge assembly to rotate, so that the moving contact makes conductive contact with the stationary contact by rotating instead of linear displacement. This ensures that the torque of the moving contact driven by the motor to rotate and the electric repulsion force after the contact system makes contact are not on the same plane, i.e., not in the same direction. This avoids the electric repulsion force affecting the motor torque, improves the stability of the contact system after contact, and at the same time, increases the service life of the DC contactor.

[0025] By incorporating an elastic element capable of generating torque, the element produces torque during the contact process of the contact system. When the contact system disengages, the torque of the elastic element resets the moving contact bridge assembly, thereby disconnecting the contact system.

[0026] By setting up permanent magnet structures and slit structures, the generated electric arc is elongated, separated, and cooled to extinguish it, thereby improving the arc extinguishing capability.

[0027] The insulated connecting frame isolates the stator and rotor of the motor from the DC main circuit where the stationary contacts are located, allowing them to operate independently and stably.

[0028] When the motor is not powered on, the moving contact and the stationary contact maintain a phase angle to ensure insulation between them.

[0029] By setting a set of oppositely arranged stators and two sets of symmetrically arranged winding coils on the rotor of the motor, the motor will no longer generate torque after rotating a certain angle, thus stopping the moving contact bridge assembly from rotating.

[0030] By setting a contact spring with greater rigidity on the connecting frame of the moving contact bridge assembly, the ability to withstand short-time current is improved by increasing the rigidity of the contact spring; at the same time, the moving contact and the stationary contact conduct electricity through friction, which can eliminate the oxide film on the contacts, thereby reducing the contact resistance.

[0031] By using a moving contact bridge to make conductive contact with the stationary contact in a rotating manner, and maintaining a certain phase angle when not energized, the malfunction of the moving contact can be prevented under vibration and shock conditions. In particular, it can effectively prevent abnormal closing of the DC contactor when the motor winding coil is de-energized, thus improving safety.

[0032] The flexible connector has a certain degree of rigidity and flexibility. The contact springs at both ends and the flexible connector provide preload to the moving contact, realizing synchronous contact and separation of the moving and stationary contacts. At the same time, it can prevent continuous bouncing when the moving and stationary contacts are in contact, thus improving service life. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a motor-type contact switch device.

[0034] Figure 2 This is a schematic diagram of the upper shell structure.

[0035] Figure 3 This is a schematic diagram of the moving contact bridge assembly.

[0036] Figure 4 This is a schematic diagram of the moving contact structure.

[0037] Figure 5 This is a schematic diagram of the installation position of the stator and the lower housing.

[0038] Figure 6 This is a schematic diagram of the stator, lower housing, and rotor mounting positions.

[0039] Figure 7 This is a schematic diagram of the installation position of the rotor and the lower housing.

[0040] Figure 8 This is a schematic diagram of the installation position of the rotor shaft and the moving contact bridge assembly.

[0041] Figure 9 This is a schematic diagram showing the positional relationship between the moving and stationary contacts when the motor is not powered on.

[0042] Figure label:

[0043] 1. Upper housing; 2. Contact spring; 3. Stationary contact; 4. Permanent magnet structure; 5. Elastic element base; 6. Annular groove structure; 7. Stator; 8. Lower housing; 9. Mounting boss; 10. Mounting ridge; 11. Rotor laminations; 12. Winding notch; 13. Winding coil; 14. Rotor shaft; 15. Positioning boss structure; 16. Shoulder structure; 17. Elastic element; 18. Moving contact; 19. Flexible connector; 10. Arc-shaped surface; 11. Connecting frame; 12. Slot; 13. Slit structure. Detailed Implementation

[0044] The motor-type contact switch device of the present invention includes a housing, a motor, a contact system, and an elastic element capable of generating torque; the contact system includes a moving contact bridge assembly and a stationary contact; the moving contact bridge assembly includes a moving contact bridge that is retractable at both ends, and the stationary contact is disposed on the housing on the outer periphery of the moving contact bridge assembly with an insulating gap;

[0045] One end of the elastic element is fixed to the housing, and the other end is fixedly connected to the moving contact bridge assembly; the motor is fixedly installed in the housing, and the rotor shaft of the motor is fixedly connected to the moving contact bridge assembly.

[0046] When the motor is not powered, the elastic element does not generate torque, and there is a phase angle between the moving contact bridge and the stationary contact, so that the moving contact bridge and the stationary contact are in an insulated interval state.

[0047] When the motor is powered on, the rotor shaft drives the moving contact bridge assembly to rotate, and the two ends of the moving contact bridge make conductive contact with the two stationary contacts respectively. At the same time, the elastic element generates torque. When the motor is powered off, the moving contact bridge assembly resets under the torque of the elastic element and disengages from the conductive contact with the stationary contacts.

[0048] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solution of this invention.

[0049] Motor-type contact switch device, see Figures 1 to 9 It includes a housing, a motor, a moving contact bridge assembly, a stationary contact, and an elastic element capable of generating torque. The motor, moving contact bridge assembly, and stationary contact include:

[0050] For ease of assembly, in this embodiment, the housing is formed by splicing an upper housing 1 and a lower housing 7. In other embodiments, it can be formed by splicing left and right housings, or by splicing several parts. The upper housing 1 is made of insulating material. The inner wall of the lower housing 7 has a circular structure. An annular mounting boss 701 is provided in the central area of ​​the bottom of the lower housing 7. Four mounting ridges 702 are evenly and symmetrically arranged circumferentially on the inner wall of the lower housing 7, dividing the inner wall of the lower housing 7 into four symmetrical stator mounting areas.

[0051] The motor includes a stator 6 and a rotor. The stator 6 is made of permanent magnet material and has an arc-shaped structure. One stator 6 is installed in each of two symmetrical stator mounting areas on the inner wall of the lower housing 7, so that the two stators 6 are symmetrically arranged in the lower housing 7. The stator 6 is tightly fitted to the inner wall of the lower housing 7 and is positioned by mounting protrusions 702 on both sides of the stator 6.

[0052] The rotor includes a rotor shaft 10 and a rotor winding, with the rotor winding fixedly mounted on the rotor shaft 10. The rotor shaft 10 has a positioning boss structure 101 at one end and a shoulder structure 102 at the other end. The positioning boss structure 101 of the rotor shaft 10 is rotatably mounted in an annular mounting boss 701 that houses the lower housing 7. Bearings are provided at the mounting boss 701 and the positioning boss structure 101 of the rotor shaft 10 to ensure smooth rotation of the rotor shaft 10. The rotor winding is sleeved on the rotor shaft 10 and supported and positioned by the positioning boss structure 101 of the rotor shaft 10. The moving contact bridge assembly is located at the shoulder structure 102 of the rotor shaft 10 and is supported and positioned by the shoulder structure 102, so that the rotor winding and the moving contact bridge assembly are located at opposite ends of the rotor shaft. The rotor winding includes rotor laminations 8 and winding coils 9. The rotor laminations 8 are made of a permanent magnet material with high coercivity, stacked in thin sheets to reduce eddy current losses, and an insulating coating is applied to the surface of the rotor laminations. The outer periphery of the rotor lamination 8 is arc-shaped. Six sets of winding notches 801 are evenly and symmetrically formed along the circumference of the rotor lamination 8. A winding skeleton is formed between two adjacent winding notches. Winding coils 9 are wound on two symmetrical winding skeletons on the rotor lamination 8. The width of one end of the winding skeleton on the outer periphery of the rotor lamination 8 is greater than the width of the winding portion of the winding skeleton to prevent the winding coils 9 from detaching from the rotor lamination 8. Two sets of symmetrically arranged winding coils 9 are formed on the rotor lamination 8, and two stators 6 are symmetrically arranged on the outer periphery of the rotor lamination 8. The purpose of this design is that when the rotor windings of the motor rotate through a certain angle and no longer generate torque, the moving contact bridge assembly automatically stops rotating.

[0053] An elastic element base 5 is provided above the stator 6 and the rotor windings. The elastic element base 5 is sleeved on the rotor shaft 10 and located between the moving contact bridge assembly and the stator and rotor windings. The elastic element base 5 is supported by the lower housing 7. The upper housing 1 defines the position of the elastic element base 5 to form a limiting structure to prevent its rotation. In this embodiment, the specific structure of the limiting structure is that part of the contact surface between the elastic element base 5 and the upper housing 1 is set as a planar structure, and part of the contact surface is set with an arc-shaped structure to prevent rotation. In order to prevent the elastic element base 5 from rotating, the limiting structure can also be provided with a limiting protrusion on the elastic element base and a limiting notch on the upper housing 1. During assembly, the limiting protrusion is locked in the limiting notch to form a lower limiting structure to prevent rotation. The elastic element base 5 is provided with an annular groove structure 501 around the rotor shaft 10. An annular boss is formed at the center of the annular groove structure 501. The annular boss is sleeved on the outer periphery of the rotor shaft, and an elastic element 11 is sleeved on the outer periphery of the annular boss. The elastic element 11 is a torsion spring capable of generating torque. One end of the elastic element 11 is fixedly connected to the elastic element base 5, and the other end is fixedly connected to the moving contact bridge assembly. When the motor is not energized, the elastic element 11 does not generate torque. To ensure stability between components, a minimum torque is applied to the elastic element during assembly. This torque is a pre-torque during assembly, preventing wobbling and abnormal noise from the connecting bracket connected to the elastic element. This pre-torque is different from the torque generated when the motor is energized, which causes the moving contact bridge assembly to rotate.

[0054] The moving contact bridge assembly includes an insulated connecting frame 14, two moving contacts 12, a conductive flexible connector 13, and a contact spring 2. The connecting frame 14 is made of insulating material and is fixedly mounted on the shoulder structure 102 of the rotor shaft 10, ensuring that the torque generated by the rotor can be transmitted to the moving contact bridge assembly, driving it to rotate. The connecting frame 14 is supported and limited by the shoulder structure 102. One end of the elastic member 11 is fixedly connected to the connecting frame 14. Two sliding grooves 141 are provided on the connecting frame 14. In this embodiment, the two sliding grooves are symmetrically arranged on the connecting frame 14, with one end of the sliding groove 141 facing the rotor shaft direction and the other end facing the stationary contact direction. One end of the sliding groove penetrates the outer peripheral surface of the connecting frame 14. A contact spring 2 and a moving contact 12 are provided on one sliding groove. The moving contact 12 is located on the end of the slide groove facing the housing. One end of the contact spring 2 is fixedly connected to the end of the slide groove facing the rotor shaft, and the other end is fixedly connected to the moving contact 12. The moving contact 12 has an arrow-shaped structure, and the end face facing the housing is an arc-shaped surface 121. One end of the moving contact 12 is located in the slide groove, and the other arc-shaped end is located on the outer periphery of the connecting frame 14. When the end of the moving contact 12 located on the outer periphery of the connecting frame 14 is pressed by an external force through the contact spring 2, it moves along the slide groove towards the rotor shaft. When no external force is applied, it moves along the slide groove towards the outside of the connecting frame 14 under the elastic force of the contact spring 2. The two moving contacts 12 are electrically connected by a conductive flexible connector 13, forming a movable contact bridge structure with retractable ends. The flexible connector 13 possesses both flexibility and rigidity, providing a certain preload to the moving contacts 12 through the flexible connector 13 and the contact spring 2, achieving synchronous contact and separation of the moving and stationary contacts. This also prevents continuous bouncing during contact, improving service life. Both the flexible connector 13 and the moving contacts 12 are made of conductive materials with good electrical conductivity; preferably, they are made of the same material with good electrical conductivity.

[0055] Two stationary contacts 3 are disposed at the same horizontal level as the upper housing 1 and the two moving contacts 12. The two stationary contacts 3 are insulated from each other on the upper housing 1. One end of the stationary contact 3 is located outside the upper housing 1, and the other end is located inside the upper housing 1 and outside the connecting frame 14. The part of the upper housing 1 that contacts the stationary contact 3 is made of insulating material. Preferably, the entire upper housing 1 is made of insulating material. The included angle between the two stationary contacts 3 is the same as the included angle between the two moving contacts 12. When the included angle between the two moving contacts 12 is 180 degrees, the included angle between the two stationary contacts 3 is also 180 degrees. That is, when the connecting frame 14 rotates, when one moving contact 12 makes conductive contact with one stationary contact 3, the other moving contact 12 will necessarily make conductive contact with the other stationary contact 3, ensuring that the moving contact and the stationary contact are in conductive contact when in contact.

[0056] When the motor is not energized, there is a phase angle between the stationary contact 3 and the moving contact 12, and this phase angle satisfies the insulation between the stationary contact 3 and the moving contact 12. When the included angle between the two moving contacts 12 and the two stationary contacts 3 is 180 degrees, in order to have the maximum opening distance (break distance) after disconnection, the phase angle between the stationary contact 3 and the moving contact 12 is preferably 90 degrees.

[0057] When the motor rotor winding is energized, the rotor current and the stator magnetic field generate torque, which drives the moving contact bridge assembly to rotate. As the moving contact bridge assembly rotates, the elastic element generates torque. The torque generated by the motor overcomes the torque generated by the elastic element, causing the moving contact bridge assembly to rotate by a corresponding angle (i.e., phase angle), so that the moving contact 12 rotates to the stationary contact 3, closing the moving and stationary contacts and connecting the DC main circuit connected to the stationary contact 3. When the motor rotor winding is de-energized, the torque disappears, and the moving contact bridge assembly resets to its initial position under the torque of the elastic element. The moving and stationary contacts separate, the DC main circuit is disconnected, and the elastic element resets.

[0058] When the moving contact 12 makes conductive contact with the stationary contact 3, the end of the moving contact 12 facing the housing and its arc-shaped surface facilitate conductive contact with the stationary contact 3. Initially, the moving contact 12 experiences relatively little pressure from the stationary contact 3. As the moving contact 12 continues to rotate, the most prominent part of its arc-shaped surface makes conductive contact with the stationary contact 3. At this point, the pressure on the moving contact 12 is at its maximum, and the contact spring 2 is compressed. The direction of the electric repulsive force generated by the conductive contact between the moving contact 12 and the stationary contact 3 is different from the direction of the torque in the direction of rotation of the moving contact 12; they are not on the same plane. This prevents the electric repulsive force from reducing the torque generated by the rotation of the motor rotor windings. Since the contact pressure between the moving and stationary contacts no longer relies on the electromagnetic attraction of the traditional DC contactor coil, the stiffness coefficient of the contact spring can be very large, which can effectively reduce the contact resistance. At the same time, the contact form between the moving and stationary contacts changes, and there is friction when connecting or disconnecting, which can eliminate the film resistance and further reduce the contact resistance. When there is a short circuit current, due to the large pressure of the contact system, it is difficult for the moving and stationary contacts to repel each other. Even if they do repel each other, the contact spring with a large stiffness coefficient will quickly close the moving contact, thus greatly improving the product's short circuit resistance.

[0059] To enhance arc-extinguishing capability, several slit structures 15 are provided on the outer peripheral surface of the connecting frame 14 outside the two moving contacts 12 and on the inner wall of the upper housing 1. When the moving and stationary contacts are connected or disconnected, the generated arc can be cut and cooled by the slit structures 15. Several protruding teeth are provided at intervals along the circumferential direction on the outer peripheral surface of the connecting frame 14 and the inner wall of the upper housing 1, and a slit structure 15 is formed between two adjacent protruding teeth. To further improve arc-extinguishing capability, inert gas can also be filled into the cavity where the contact system is located for arc extinguishing.

[0060] To improve arc extinguishing capability, a ring-shaped permanent magnet structure 4 is provided on the elastic base 5. The permanent magnet structure 4 is located at the contact surface of the moving and stationary contacts. The permanent magnet structure 4 is made of permanent magnet material, and its surface can be coated with high-temperature resistant insulating material to prevent it from failing due to excessive arc temperature. Because the opening distance between the moving and stationary contacts is relatively large during disconnection, when the moving and stationary contacts separate and generate an arc, the magnetic field generated by the permanent magnet structure 4 forces the arc into the slit structure 15 at the upper housing 1 and the connecting frame 14. Through the rotation of the connecting frame 14, the arc is lengthened, divided, and cooled, achieving rapid arc extinguishing, improving heat dissipation capacity, and avoiding the risk of housing cracking.

[0061] The stationary contact 3 is electrically connected to the external DC main circuit of the contactor. Since the moving contact connecting frame is made of insulating material, complete isolation between the motor drive system and the DC main circuit can be achieved, allowing for independent and stable operation of both systems. The moving contact connecting frame is fixed to the rotor shaft, eliminating relative friction during operation and preventing wear on the upper part of the rotor shaft from affecting the motor drive system, thus extending the service life of the DC contactor.

[0062] The workflow of this invention:

[0063] When the motor is not powered, the moving contact 12 and the stationary contact 3 maintain a certain phase angle. This phase angle satisfies the insulation between the moving contact 12 and the stationary contact 3, and minimizes the torque generated by the elastic element 11.

[0064] When the motor is energized, the rotor windings rotate, causing the moving contact bridge assembly to rotate synchronously. The elastic element base remains stationary. As the moving contact bridge rotates, the elastic element 11 generates torque. This torque increases with further rotation of the moving contact bridge. The torque generated by the motor's rotation overcomes the elastic torque, causing the moving contact bridge assembly to rotate and making conductive contact between the moving and stationary contacts, thus activating the DC main circuit where the stationary contact 3 is located. As the moving contact 12 further contacts the stationary contact 3, the contact spring 2 is compressed. Since the motor has only two symmetrically arranged winding coils 9, once the motor rotor winding assembly has rotated through a certain angle, it no longer generates torque, and the moving contact bridge assembly automatically stops rotating. At this point, the phase angle between the moving and stationary contacts is eliminated, and the moving contact 12 and stationary contact 3 are in complete conductive contact. The N and S poles generated by the winding coils on the rotor plates attract the stator, maintaining this equilibrium state.

[0065] When disconnected, the motor is de-energized, and the moving contact bridge assembly, under the torque of the elastic element, rotates and resets the rotor winding.

Claims

1. An electric motor type contact switch device, characterized by, The utility model provides a contact system of a motor, which comprises a shell, a motor, a contact system, and an elastic member capable of generating torque. The contact system comprises a movable contact bridge assembly and a stationary contact. The movable contact bridge assembly comprises a movable contact bridge with two ends capable of being extended and retracted. The stationary contact is arranged on the shell at the outer circumferential side of the movable contact bridge assembly in an insulating and spaced manner. One end of the elastic member is fixed on the shell, and the other end is fixedly connected with the movable contact bridge assembly.

2. The motor-type contact breaker device according to claim 1, wherein The motor is fixedly installed in the shell, and a rotor shaft of the motor is fixedly connected with the movable contact bridge assembly.

3. The motor-type contact breaker device according to claim 2, wherein When the motor is not powered, the elastic member does not generate torque, and there is a phase angle between the movable contact bridge and the stationary contact, so that the movable contact bridge and the stationary contact are arranged in an insulating and spaced manner.

4. The motor-type contact switch device according to claim 2, characterized in that, When the motor is powered, the rotor shaft of the motor drives the movable contact bridge assembly to rotate, and the two ends of the movable contact bridge are respectively in conductive contact with two stationary contacts, and at the same time, the elastic member generates torque.

5. The motor-type contact switch device according to claim 4, characterized in that, When the motor is powered off, the movable contact bridge assembly is reset under the action of the torque of the elastic member and is separated from the conductive contact with the stationary contact. The motor comprises two stators and a rotor. The two stators are symmetrically arranged in the shell at the outer circumferential side of the rotor. The rotor comprises a rotor shaft and a rotor winding assembly fixed on the rotor shaft. The movable contact bridge assembly is fixedly arranged on the rotor shaft away from the rotor winding assembly. The rotor winding assembly comprises a plurality of rotor sheets stacked and arranged on the rotor shaft. A plurality of winding gaps for winding winding coils are uniformly arranged on the rotor sheets in the circumferential direction. Two winding skeletons are symmetrically arranged on the rotor sheets. The stator has a circular arc bending structure. The two stators are symmetrically arranged on the inner wall of the shell at the outer circumferential side of the rotor. The rotor sheets are coated with an insulating coating. The movable contact bridge assembly comprises an insulating connecting frame and a movable contact bridge. The movable contact bridge comprises two movable contacts, a conductive soft connecting member, and a contact spring. The movable contacts are movably and spacedly arranged on the connecting frame. One end of the contact spring is fixed on the connecting frame, and the other end is fixedly connected with the movable contact. One end of the movable contact extends outward from the connecting frame. The soft connecting member connects the two movable contacts. The connecting frame is fixedly arranged on the rotor shaft of the motor. One end of the elastic member is fixedly connected with the connecting frame. When the movable contacts are in conductive contact, the rotor shaft of the motor rotates with the connecting frame, so that the movable contacts are in conductive contact with the stationary contacts. Two stationary contacts are symmetrically arranged on opposite outer sides of the connecting frame. Two sliding grooves are arranged on the connecting frame. The two movable contacts are slidably arranged in the sliding grooves. The movable contacts are connected with the connecting frame through the contact springs arranged in the sliding grooves. When the contact system is in conductive contact, the movable contacts are displaced along the sliding grooves toward the center of the connecting frame under the extrusion of the stationary contacts, and the contact springs are compressed.

6. The motor-type contact breaker device according to claim 5, wherein The end of the moving contact towards the shell is located outside the connecting frame, and the other end is located in the sliding groove.

7. The motor-type contact switch device according to claim 5, characterized in that, A plurality of arc extinguishing slit structures are arranged on the outer circumferential surface of the connecting frame and the corresponding inner wall of the shell in the circumferential direction.

8. The motor-type contact switch device according to claim 7, characterized in that, An annular permanent magnet structure is arranged in the shell on the side where the static contact and the moving contact are in contact, and the magnetic field of the permanent magnet structure can guide the arc generated by the contact system into the slit structure for arc extinguishing.

9. The motor-type contact switch device according to claim 8, characterized in that, The outer periphery of the annular permanent magnet structure is coated with a high-temperature-resistant insulating material.

10. The motor-type contact switch device according to claim 1, characterized in that, The chamber where the contact system is located is filled with inert gas.

11. Motor type contact switch device according to any of claims 1 to 10, characterized in that The elastic member is a torsion spring.

12. The motor-type contact switch device according to claim 11, characterized in that, An elastic member base is fixedly arranged in the shell between the motor and the moving contact bridge assembly, the elastic member is mounted on the elastic member base, one end of the elastic member is fixedly connected with the elastic member base, and the other end is connected with the moving contact bridge assembly.

13. The motor-type contact switch device according to claim 12, characterized in that, The elastic member base is sleeved on the rotor shaft of the motor, an annular groove is formed in the end face of the elastic member base towards the moving contact bridge assembly around the rotor shaft, and the elastic member is arranged in the annular groove.

14. The motor-type contact switch device according to claim 12, wherein The permanent magnet structure is arranged between the elastic member base and the contact system.

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