Rapid switch based on electromagnetic holding device and working method thereof

Abstract

The present invention proposes a fast switch based on an electromagnetic holding device and a working method thereof, comprising: a moving contact, an eddy current repulsion mechanism, an electromagnetic holding device and a control unit; the moving contact is connected to the eddy current repulsion mechanism and the electromagnetic holding device in sequence through a guide rod; the electromagnetic holding device is used to provide a permanent magnetic attraction when not powered on, and to offset the permanent magnetic attraction when powered on; the eddy current repulsion mechanism is used to generate a repulsion force when powered on to push the moving contact to open or close; the control unit is respectively connected to the eddy current repulsion mechanism and the electromagnetic holding device to control the power on and off thereof. The holding force can be adjusted by flexibly adjusting the magnitude of the holding coil current through the control unit, thereby effectively preventing the rebound of the repulsion mechanism caused by the excessive impact of the repulsion disk at the end of the opening and closing, and when the opening and closing state is switched, a pulse current in a certain direction is passed to the holding coil of the previous state in advance to offset the force of the permanent magnet, so that the initial movement speed of the switch is not affected by the holding force.

Description

Technical Field

[0001] The invention belongs to the technical field of switch electrical appliances, and in particular relates to a fast switch based on an electromagnetic holding device and a working method thereof. Background Art

[0002] As the capacity of the power grid continues to expand and the voltage and current levels continue to increase, electrical switches based on eddy current repulsion mechanisms are increasingly attracting attention due to their rapid breaking speed and high breaking capacity. Since the repulsive force generated by the eddy current repulsion mechanism is extremely large, in order to prevent the repulsion disk from rebounding due to excessive impact at the end of the opening and closing, a suitable holding device is required to maintain the opening and closing state. Especially when the contact opening distance is small, the movement stroke of the repulsion disk is short, and the repulsion disk is still in the acceleration process at the end of the movement stroke, resulting in a large impact force, which affects the life of the electrical switch. In addition, if the holding force of the fast switch is too large, it will affect the initial movement speed of the opening and closing, thereby affecting the function and effect of the fast switch.

[0003] At present, there is a contradiction in the design of the holding device of the eddy current repulsion mechanism: in order to prevent the repulsion disk from rebounding due to excessive impact at the end of the opening and closing, it should have a large holding force, but too large a holding force will affect the initial movement speed of the opening and closing. At present, most holding mechanisms use permanent magnets or bistable springs. The problem with the holding device composed of permanent magnets is that the eddy current repulsion mechanism needs to overcome the permanent magnetic holding force in the initial stage of the opening and closing, resulting in a decrease in the initial movement speed, thereby weakening the inherent advantage of the eddy current repulsion mechanism in terms of rapidity. The holding mechanism composed of bistable springs is in a compressed state after the closing and opening actions are completed, thereby providing a certain spring force to maintain the holding state of the opening and closing. This holding mechanism has the disadvantages of being more complicated to install and fix, and having a larger radial size. In addition, since the holding force applied by the bistable spring needs to be overcome in the initial stage of the opening and closing, it will also affect the movement speed in the initial stage of the opening and closing. Summary of the invention

[0004] In view of this, in order to make up for the gaps and shortcomings of the prior art, the purpose of the present invention is to provide a fast switch based on an electromagnetic holding device and a working method thereof, which can quickly and reliably disconnect the circuit, and flexibly adjust the holding coil current by a control unit to adjust the holding force, thereby effectively preventing the eddy current repulsion mechanism from rebounding due to excessive impact of the repulsion disk at the end of opening and closing. When the opening and closing state is switched, a pulse current in a certain direction is passed through the holding coil of the previous state in advance to offset the force of the permanent magnet, so the holding force will not affect the initial movement speed of the eddy current repulsion mechanism.

[0005] It mainly includes: moving and static contacts, eddy current repulsion mechanism, electromagnetic holding device and control unit; the guide rod is a transmission rod, which is fixedly connected to the moving contact, the repulsion disk and the holding moving iron core, and the permanent magnet is installed on the holding iron core. When the fast switch closes (opens) the switch, the control unit first controls the opening (closing) switch holding coil to pass a pulse current in a certain direction to offset the permanent magnetic attraction of the permanent magnet and lose the opening (closing) switch holding force. The present invention can adjust the holding force by flexibly adjusting the size of the holding coil current through the control unit, thereby effectively preventing the eddy current repulsion mechanism from rebounding due to the excessive impact of the repulsion disk at the end of the opening and closing, and when the opening and closing state is converted, the holding coil of the previous state is passed with a pulse current in a certain direction in advance, which offsets the force of the permanent magnet, so that the initial movement speed of the eddy current repulsion mechanism is not affected by the holding force.

[0006] The present invention specifically adopts the following technical solutions:

[0007] A fast switch based on an electromagnetic holding device, characterized in that it includes: moving and static contacts, an eddy current repulsion mechanism, an electromagnetic holding device and a control unit; wherein the moving contact is connected to the eddy current repulsion mechanism and the electromagnetic holding device in sequence through a guide rod; the electromagnetic holding device is used to provide permanent magnetic attraction when power is not supplied, and to offset the permanent magnetic attraction when power is supplied; the eddy current repulsion mechanism is used to generate repulsion when power is supplied to push the moving contact to open or close the switch; the control unit is connected to the eddy current repulsion mechanism and the electromagnetic holding device respectively, and is used to control the on and off of the eddy current repulsion mechanism and the electromagnetic holding device.

[0008] Furthermore, the eddy current repulsion mechanism includes: a closing coil, a repulsion disk and an opening coil, the repulsion disk is fixed on the guide rod, and the closing coil and the opening coil are respectively located on both sides of the repulsion disk and are fixed in position; the electromagnetic holding device includes a permanent magnet, a closing holding static iron core, a closing holding coil, a holding moving iron core, an opening holding coil, and an opening holding static iron core; the closing holding static iron core and the opening holding static iron core are respectively located on both sides of the holding moving iron core and are fixed in position, and the closing holding coil and the opening holding coil are respectively sleeved on the closing holding static iron core and the opening holding static iron core.

[0009] Furthermore, the positions of the closing and opening static iron cores correspond to the positions of the closing coil and the opening coil of the eddy current repulsion mechanism, respectively. That is, when the closing coil is located below (or above) the repulsion disk, the closing static iron core is located above (or below) the holding moving iron core, and when the opening coil is located above (or below) the repulsion disk, the opening static iron core is located below (or above) the holding moving iron core.

[0010] Furthermore, the shape of the static iron core is a screw-type or U-shaped shape, or may be other shapes, which is used to make the resultant force on the moving iron core parallel to the direction of the guide rod.

[0011] Furthermore, the permanent magnet is installed on the moving iron core or on the static iron core. It can also be adjusted according to the shape of the iron core.

[0012] Furthermore, the guide rod is a transmission rod, one end of which is fixedly connected to the moving contact and the other end is fixedly connected to the moving iron core. The repulsion disk passes through the guide rod and is fixed on the guide rod. A hole is opened in the middle of the static iron core for closing the switch, and the guide rod passes through the hole.

[0013] Furthermore, the control unit adopts a single chip microcomputer.

[0014] Furthermore, when the rapid switch is closed, the control unit first controls the opening holding coil to pass a pulse current in a certain direction, so that the direction of the magnetic field generated by the coil current is opposite to the direction of the magnetic field generated by the permanent magnet, offsetting the effect of the permanent magnetic attraction of the permanent magnet, and losing the opening holding force. Then the control unit discharges to the closing coil, so that a repulsive force is generated between the closing coil disk and the repulsion disk, and the repulsion disk drives the guide rod to move; when the moving contact moves to the closing position with the guide rod, the control unit controls the closing holding coil to be energized, and the closing holding static iron core generates an electromagnetic attraction to attract and hold the moving iron core, generating an instantaneous holding force to keep the repulsion disk in the closing position; when the repulsion mechanism operates stably, the control unit controls the closing holding coil to be de-energized, and the electromagnetic attraction of the moving and static iron cores disappears, and the contact is kept in the closing position through the guide rod by relying on the permanent magnetic attraction generated by the permanent magnet.

[0015] Furthermore, when the rapid switch opens, the control unit first controls the closing holding coil to pass a pulse current in a certain direction, so that the direction of the magnetic field generated by the coil current is opposite to the direction of the magnetic field generated by the permanent magnet, offsetting the permanent magnetic attraction generated by the permanent magnet, and losing the closing holding force. Then the control unit discharges to the opening coil, so that a repulsive force is generated between the opening coil disk and the repulsion disk, and the repulsion disk drives the guide rod to move. When the moving contact moves to the opening position with the guide rod, the control unit controls the opening holding coil to be energized, so that the static iron core of the opening holding generates an electromagnetic attraction to attract and hold the moving iron core, and generates an instantaneous holding force to keep the repulsion disk in the opening position. When the repulsion mechanism operates stably, the control unit controls the opening holding coil to be de-energized, and the electromagnetic attraction of the moving and static iron cores disappears. Relying on the permanent magnetic attraction generated by the permanent magnet, the contact is kept in the opening position through the guide rod.

[0016] The electromagnetic holding device can effectively prevent the eddy current repulsion mechanism from rebounding due to excessive impact of the repulsion disk at the end of closing or opening, and when switching between opening and closing states, a pulse current in a certain direction is passed through the holding coil in the previous state in advance to offset the force of the permanent magnet, so that the initial movement speed of the eddy current repulsion mechanism is not affected by the holding force.

[0017] Furthermore, the magnitude of the instantaneous holding force is adjusted by changing the magnitude of the opening and closing holding coil current, and the magnitude of the steady-state holding force is adjusted by changing the size of the permanent magnet.

[0018] Compared with the prior art, the present invention and its preferred embodiment provide a fast switch whose initial speed is not affected by the holding force during opening and closing, and whose holding force is flexible and adjustable. The electromagnetic holding device of the fast switch applies a holding current of a specific size to the closing holding coil and the opening holding coil at a specific time, so that the eddy current repulsion mechanism can be stably maintained in the closing and opening positions. When the fast switch is closed (opened), the control unit first controls the opening (closing) holding coil to pass a pulse current in a certain direction to offset the permanent magnetic attraction of the permanent magnet, lose the opening (closing) holding force, and make the initial movement speed of the eddy current repulsion mechanism unaffected by the holding force. This solves the problem that the holding force affects the initial movement speed of the eddy current repulsion mechanism in the initial stage of the opening or closing action in other fast switch holding methods. Therefore, compared with other fast switches, it is faster and more reliable, and can quickly and reliably disconnect the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 This is a schematic diagram of a fast switch structure with a solenoid-type holding core according to Embodiment 1 of the present invention, in which a permanent magnet is installed on the holding static core and is in a closed state;

[0021] Figure 2 This is a schematic diagram of a fast switch structure with a solenoid-type holding core according to Embodiment 1 of the present invention, in which a permanent magnet is installed on the holding static core and is in an open state;

[0022] Figure 3 This is a schematic diagram of a fast switch structure with a U-shaped holding core according to Embodiment 2 of the present invention, in which a permanent magnet is mounted on the holding moving core and is in a closed state;

[0023] Figure 4 This is a schematic diagram of the structure of a fast switch with a U-shaped holding core according to Embodiment 2 of the present invention, in which a permanent magnet is mounted on the holding moving core and is in an open state;

[0024] In the figure: 1 is the static contact, 2 is the moving contact, 3 is the guide rod, 4 is the opening coil, 5 is the repulsion disk, 6 is the closing coil, 7 is the permanent magnet, 8 is the closing holding static iron core, 9 is the closing holding coil, 10 is the holding moving iron core, 11 is the opening holding coil, and 12 is the opening holding static iron core. DETAILED DESCRIPTION

[0025] In order to make the features and advantages of this patent more obvious and easy to understand, two embodiments are specifically cited below for detailed description as follows:

[0026] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] Figure 1 , Figure 2 FIG. 1 is a schematic diagram of the structure of a fast switch based on an electromagnetic holding device according to Embodiment 1 of the present invention. Figure 1 , Figure 2 As shown, the electromagnetic holding device for the eddy current repulsion mechanism includes a static contact 1, a moving contact 2, a guide rod 3, a gate opening coil 4, a repulsion disk 5, a closing coil 6, a permanent magnet 7, a closing holding static iron core 8, a closing holding coil 9, a holding moving iron core 10, a gate opening holding coil 11, and a gate opening holding static iron core 12. This embodiment provides a fast switch whose speed is not affected by the holding force during opening and closing, and whose holding force is flexible and adjustable; the fast switch of this embodiment is mainly composed of an eddy current repulsion mechanism and an electromagnetic holding device. Here, the electromagnetic holding device adopts a solenoid structure. The eddy current repulsion mechanism provides a power source during the opening and closing operation, drives the repulsion disk 5 to move, drives the moving contact 2 and the holding moving iron core 10 to move together through the guide rod, and changes the switch state of the fast switch; the electromagnetic holding device is used to provide the contact with the opening holding force and the closing holding force, so that the switch is in a stable opening state or closing state, and in the initial opening and closing, the corresponding holding coil is passed with a pulse current to offset the permanent magnetic holding force, so that the initial movement speed of the eddy current repulsion mechanism is not affected.

[0028] The eddy current repulsion mechanism mainly includes an opening coil 4, a repulsion disk 5, and a closing coil 6. The opening coil 4 is located above the repulsion disk 5, and the closing coil 6 is located below the repulsion disk 5. The repulsion disk 5 is fixedly connected to the guide rod 3. Its working principle is as follows: when the fast switch needs to be opened, the control unit controls the pulse current to pass through the opening coil 4. Due to the principle of electromagnetic induction, eddy currents will be induced on the repulsion disk 5. The eddy current will be subjected to a downward magnetic field force, namely, eddy current repulsion, causing the repulsion disk 5 to move downward. The repulsion disk 5 drives the moving contact 2 and the moving iron core 10 to move downward together through the guide rod 3, and reaches the opening position and is held in the opening position by the electromagnetic holding device. Similarly, when a closing operation is required, the control unit controls the pulse current to pass through the closing coil 6. Due to the principle of electromagnetic induction, eddy currents will be induced on the repulsion disk 5. The eddy currents will be affected by the upward magnetic field force, namely, eddy current repulsion, causing the repulsion disk 5 to move upward. The repulsion disk 5 drives the moving contact 2 and the moving iron core 10 to move upward together through the guide rod 3, and when they reach the closing position, they are held in the closing position by the electromagnetic holding device.

[0029] The electromagnetic holding device mainly includes a permanent magnet 7, a closing holding static iron core 8, a closing holding coil 9, a holding moving iron core 10, an opening holding coil 11, and an opening holding static iron core 12. The closing holding static iron core 8 is located above the holding moving iron core 10, and the opening holding static iron core 12 is located below the holding moving iron core 10, wherein the holding moving iron core 10 is fixedly connected to the guide rod 3. Its working principle is as follows: when the fast switch is to move from the closed position to the open position, the control unit first controls the closing holding coil 9 to pass a pulse current in a certain direction, so that the direction of the magnetic field generated by the coil current is opposite to the direction of the magnetic field generated by the permanent magnet 7 installed in the closing holding static iron core 8, so as to offset the effect of the permanent magnetic attraction of the permanent magnet 7 installed in the closing holding static iron core 8, and lose the holding force of the closed state. When the moving contact 2 moves to the open position with the guide rod 3, the control unit controls the opening holding coil 11 to energize, so that the opening holding static iron core 12 generates an electromagnetic attraction to attract and hold the moving iron core 10, and generates an instantaneous holding force to keep the repulsion disk 5 in the open position. When the repulsion mechanism stabilizes, the control unit controls the opening holding coil 11 to de-energize, and the electromagnetic attraction of the moving and static iron cores disappears. Relying on the downward permanent magnetic attraction generated by the permanent magnet 7 installed in the opening holding static iron core 12, the contact is kept in the open position through the guide rod. Opening position; when the fast switch is to move from the opening position to the closing position, the control unit first controls the opening holding coil 11 to pass a pulse current in a certain direction, so that the direction of the magnetic field generated by the coil current is opposite to the direction of the magnetic field generated by the permanent magnet 7 installed in the opening holding static iron core 12, so as to offset the effect of the permanent magnetic attraction of the permanent magnet 7 installed in the opening holding static iron core 12, and lose the holding force of the opening state. When the moving contact 2 moves to the closing position with the guide rod 3, the control unit controls the closing holding coil 9 to be energized, so that the closing holding static iron core 8 generates an electromagnetic attraction to attract and hold the moving iron core 10, and generates an instantaneous holding force to keep the repulsion disk 5 in the closing position. When the repulsion mechanism operates stably, the control unit controls the opening holding coil 9 to be de-energized, and the electromagnetic attraction of the moving and static iron cores disappears. Relying on the upward permanent magnetic attraction generated by the permanent magnet 7 installed in the closing holding static iron core 8, the contact is kept in the closing position through the guide rod.

[0030] Figure 3 , Figure 4 FIG. 2 is a schematic diagram of the structure of a fast switch based on an electromagnetic holding device according to Embodiment 2 of the present invention. Figure 3 , Figure 4As shown, the electromagnetic holding device for the eddy current repulsion mechanism includes a static contact 1, a moving contact 2, a guide rod 3, a gate opening coil 4, a repulsion disk 5, a closing coil 6, a permanent magnet 7, a closing holding static iron core 8, a closing holding coil 9, a holding moving iron core 10, a gate opening holding coil 11, and a gate opening holding static iron core 12. This embodiment provides a fast switch whose speed is not affected by the holding force during opening and closing, and whose holding force is flexible and adjustable; the fast switch of this embodiment is mainly composed of an eddy current repulsion mechanism and an electromagnetic holding device. Here, the electromagnetic holding device adopts a U-shaped structure. The eddy current repulsion mechanism provides a power source during the opening and closing operation, drives the repulsion disk 5 to move, drives the moving contact 2 and the holding moving iron core 10 to move together through the guide rod, and changes the switch state of the fast switch; the electromagnetic holding device is used to provide the contact with the opening holding force and the closing holding force, so that the switch is in a stable opening state or closing state, and in the initial opening and closing, the corresponding holding coil is passed with a pulse current to offset the holding force, so that the initial movement speed of the eddy current repulsion mechanism is not affected.

[0031] The eddy current repulsion mechanism mainly includes an opening coil 4, a repulsion disk 5, and a closing coil 6. The opening coil 4 is located above the repulsion disk 5, and the closing coil 6 is located below the repulsion disk 5. The repulsion disk 5 is fixedly connected to the guide rod 3. Its working principle is as follows: when the fast switch needs to be opened, the control unit controls the pulse current to pass through the opening coil 4. Due to the principle of electromagnetic induction, eddy currents will be induced on the repulsion disk 5. The eddy current will be subjected to a downward magnetic field force, namely, eddy current repulsion, causing the repulsion disk 5 to move downward. The repulsion disk 5 drives the moving contact 2 and the moving iron core 10 to move downward together through the guide rod 3, and reaches the opening position and is held in the opening position by the electromagnetic holding device. Similarly, when a closing operation is required, the control unit controls the pulse current to pass through the closing coil 6. Due to the principle of electromagnetic induction, eddy currents will be induced on the repulsion disk 5. The eddy currents will be affected by the upward magnetic field force, namely, eddy current repulsion, causing the repulsion disk 5 to move upward. The repulsion disk 5 drives the moving contact 2 and the moving iron core 10 to move upward together through the guide rod 3, and when they reach the closing position, they are held in the closing position by the electromagnetic holding device.

[0032] The electromagnetic holding device mainly includes a permanent magnet 7, a closing holding static iron core 8, a closing holding coil 9, a holding moving iron core 10, an opening holding coil 11, and an opening holding static iron core 12. The closing holding static iron core 8 is located above the holding moving iron core 10, and the opening holding static iron core 12 is located below the holding moving iron core 10, wherein the holding moving iron core 10 is fixedly connected to the guide rod 3. Its working principle is as follows: when the fast switch is to move from the closing position to the opening position, the control unit first controls the closing holding coil 9 to pass a pulse current in a certain direction, so that the direction of the magnetic field generated by the coil current is opposite to the direction of the magnetic field generated by the permanent magnet 7, so as to offset the effect of the permanent magnetic attraction of the permanent magnet 7 and lose the holding force of the closing state. When the moving contact 2 moves to the opening position with the guide rod 3, the control unit controls the opening holding coil 11 to be energized, so that the opening holding static iron core 12 generates an electromagnetic attraction to attract and hold the moving iron core 10, and generates an instantaneous holding force to keep the repulsion disk 5 in the opening position. When the repulsion mechanism stabilizes, the control unit controls the opening holding coil 11 to be de-energized, and the electromagnetic attraction of the moving and static iron cores disappears. Relying on the downward permanent magnetic attraction generated by the permanent magnet 7, the contact is kept in the opening position through the guide rod. Open position; when the fast switch is to move from the open position to the closed position, the control unit first controls the open holding coil 11 to pass a pulse current in a certain direction, so that the direction of the magnetic field generated by the coil current is opposite to the direction of the magnetic field generated by the permanent magnet 7, so as to offset the effect of the permanent magnetic attraction of the permanent magnet 7 and lose the holding force of the open state. When the moving contact 2 moves to the closed position with the guide rod 3, the control unit controls the closing holding coil 9 to be energized, so that the closing holding static iron core 8 generates an electromagnetic attraction to attract and hold the moving iron core 10, and generates an instantaneous holding force to keep the repulsion disk 5 in the closed position. When the repulsion mechanism operates stably, the control unit controls the open holding coil 9 to be de-energized, and the electromagnetic attraction of the moving and static iron cores disappears. Relying on the upward permanent magnetic attraction generated by the permanent magnet 7, the contact is kept in the closed position through the guide rod.

[0033] When the present invention is implemented, the electromagnetic holding device of the fast switch applies a holding current of a specific size to the closing holding coil and the opening holding coil at a specific time, so that the eddy current repulsion mechanism can be stably maintained in the closing and opening positions. When the fast switch is closed (opened), the control unit first controls the opening (closing) holding coil to pass a pulse current in a certain direction to offset the permanent magnetic attraction of the permanent magnet, lose the opening (closing) holding force, and make the initial movement speed of the eddy current repulsion mechanism unaffected. The problem that the holding force of other fast switch holding methods affects the initial movement speed of the eddy current repulsion mechanism at the beginning of the opening or closing action is solved. Therefore, compared with other fast switches, it is faster and more reliable, and can quickly and reliably disconnect the circuit.

[0034] Unless otherwise stated, the terms used in any technical solution disclosed in the above embodiments to indicate positional relationships or shapes include states or shapes that are approximate, similar or close thereto.

[0035] This patent is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of fast switches based on electromagnetic holding devices and their working methods under the inspiration of this patent. All equal changes and modifications made according to the scope of the patent application of the present invention should be covered by this patent.

Claims

1. A fast switch based on an electromagnetic holding device, characterized in that: include: Moving and static contacts, eddy current repulsion mechanism, electromagnetic holding device and control unit; wherein the moving contact is connected to the eddy current repulsion mechanism and the electromagnetic holding device in sequence through a guide rod; the electromagnetic holding device is used to provide permanent magnetic attraction when power is not supplied, and to offset the permanent magnetic attraction when power is supplied; the eddy current repulsion mechanism is used to generate repulsion force to push the moving contact to open or close when power is supplied; the control unit is connected to the eddy current repulsion mechanism and the electromagnetic holding device respectively, and is used to control the on and off of the eddy current repulsion mechanism and the electromagnetic holding device; The eddy current repulsion mechanism comprises: a closing coil, a repulsion disk and an opening coil, wherein the repulsion disk is fixed on the guide rod, and the closing coil and the opening coil are respectively located on both sides of the repulsion disk and are fixed in position; the electromagnetic holding device comprises a permanent magnet, a closing holding static iron core, a closing holding coil, a holding moving iron core, an opening holding coil, and an opening holding static iron core; the closing holding static iron core and the opening holding static iron core are respectively located on both sides of the holding moving iron core and are fixed in position, and the closing holding coil and the opening holding coil are respectively sleeved on the closing holding static iron core and the opening holding static iron core; When the fast switch is closed, the control unit first controls the opening holding coil to pass a pulse current in a certain direction, so that the direction of the magnetic field generated by the coil current is opposite to the direction of the magnetic field generated by the permanent magnet, offsetting the effect of the permanent magnetic attraction of the permanent magnet, and losing the opening holding force. Then the control unit discharges to the closing coil, so that a repulsive force is generated between the closing coil disk and the repulsion disk, and the repulsion disk drives the guide rod to move; when the moving contact moves to the closing position with the guide rod, the control unit controls the closing holding coil to be energized, and the closing holding static iron core generates an electromagnetic attraction to attract and hold the moving iron core, generating an instantaneous holding force to keep the repulsion disk in the closing position; when the repulsion mechanism operates stably, the control unit controls the closing holding coil to be de-energized, and the electromagnetic attraction of the moving and static iron cores disappears. Relying on the permanent magnetic attraction generated by the permanent magnet, the contact is kept in the closing position through the guide rod; When the fast switch opens, the control unit first controls the closing holding coil to pass a pulse current in a certain direction, so that the direction of the magnetic field generated by the coil current is opposite to the direction of the magnetic field generated by the permanent magnet, offsetting the permanent magnetic attraction generated by the permanent magnet, and losing the closing holding force. Then the control unit discharges to the opening coil, so that a repulsive force is generated between the opening coil disk and the repulsive disk, and the repulsive disk drives the guide rod to move; When the moving contact moves to the opening position along with the guide rod, the control unit controls the opening holding coil to be energized, so that the static iron core of the opening holding generates electromagnetic attraction to attract and hold the moving iron core, generating an instantaneous holding force to keep the repulsion disk in the opening position; When the repulsion mechanism is stable, the control unit controls the opening holding coil to cut off the power, the electromagnetic attraction of the moving and static iron cores disappears, and the contacts are kept in the opening position through the guide rod by the permanent magnetic attraction generated by the permanent magnet; The magnitude of the instantaneous holding force is adjusted by changing the magnitude of the opening and closing holding coil current, and the magnitude of the steady-state holding force is adjusted by changing the size of the permanent magnet.

2. The fast switch based on the electromagnetic holding device according to claim 1 is characterized in that: The positions of the closing and opening static iron cores respectively correspond to the positions of the closing coil and the opening coil of the eddy current repulsion mechanism.

3. The fast switch based on the electromagnetic holding device according to claim 1 is characterized in that: The shape of the static iron core is a screw-type or U-shaped shape, which is used to make the resultant force on the moving iron core parallel to the direction of the guide rod.

4. The fast switch based on the electromagnetic holding device according to claim 1 is characterized in that: The permanent magnet is installed on the holding moving iron core or on the holding stationary iron core.

5. The fast switch based on the electromagnetic holding device according to claim 1, characterized in that: The guide rod is a transmission rod, one end of which is fixedly connected to the moving contact and the other end is fixedly connected to the moving iron core. The repulsion disk passes through the guide rod and is fixed on the guide rod. A hole is opened in the middle of the static iron core for closing the switch, and the guide rod passes through the hole.

6. The fast switch based on the electromagnetic holding device according to claim 1, characterized in that: The control unit adopts a single chip microcomputer.

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