Subway platform screen door driving motor

Abstract

The invention discloses a subway platform screen door driving motor which comprises a guide rail set, a rotor set and a security assembly. A plurality of stator sets are arranged in the guide rail set, and each stator set is composed of a magnet yoke body and an electromagnetic coil and used for forming an alternating magnetic field. The rotor group comprises a sliding seat, an inner sliding plate and an excitation body, the excitation body generates alternately changing magnetic fields through an excitation coil and interacts with a stator magnetic field to drive the rotor group to linearly slide along the guide rail, and opening and closing of the shielding door are achieved. The bottoms of the rotor sets are connected with the shielding door, and the multiple rotor sets are arranged at intervals in an optimized mode. And the security assembly comprises a connecting seat, a movable lug block, an electrode strip and a power connection box, and when resistance is encountered during operation, the movable lug block relatively moves to enable the electrode strip to be separated from the electrode column, the excitation circuit is cut off, active power-off shutdown is achieved, and an alarm prompt is given out. The driving motor adopts a magnet-free all-electrical excitation design, is fast in response and low in noise, has good environmental adaptability and safety, and is suitable for high-frequency stable driving control of a rail transit platform screen door system.

Description

Technical Field

[0001] The present invention relates to the technical field of drive motors, in particular to a drive motor for a subway screen door. Background Art

[0002] As the core system of urban rail transit, subway platform screen doors (PSMs) play a critical role in providing isolation and safety during train arrival, parking, and departure. Traditional subway platform screen doors typically utilize a rotary motor coupled with mechanical transmissions such as gears, chains, and screws, combined with a control system for opening and closing. Due to the multi-level coupling involved, these structures often suffer from slow response, high noise levels, wear, and complex maintenance. These doors struggle to meet the high-frequency opening and closing, low-noise, and high-safety requirements of modern subway systems.

[0003] In terms of safety protection, although the existing shield door systems have introduced safety control measures such as anti-pinch sensors or current limiting protection, most of them are passive detection and response mechanisms with delayed response time and rely heavily on software algorithm identification. They are unable to immediately cut off the driving source before actual pinching occurs, and there are hidden dangers of missed judgment, misjudgment or delayed response, which can easily cause passenger injuries or equipment damage.

[0004] In addition, most of the current mainstream linear motor drive solutions rely on permanent magnets as the core components of the mover or stator. Although they have a high thrust density, they are prone to magnetic decay or demagnetization problems in harsh rail transit environments such as high temperature and high-frequency vibration. This not only affects the stability of motor performance, but also increases the difficulty of operation and maintenance and the overall cost.

[0005] Given these challenges, current subway platform screen door drive motors still have significant room for improvement in terms of compactness, rapid response, safety protection, and operational stability. A fully electric excitation drive solution that eliminates the need for permanent magnets, offers high response speed, low noise operation, and integrates a rapid power-off protection mechanism is urgently needed to achieve more efficient, reliable, and safer platform screen door control. Summary of the Invention

[0006] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0007] To this end, the technical solution adopted by the present invention is as follows: a subway screen door drive motor, comprising: a guide rail assembly, a mover assembly, and a security assembly; a plurality of stator assemblies arranged in a straight line are provided on the inner side of the guide rail assembly; the mover assembly comprises a slide, an inner slide, and an excitation body embedded in the surface of the inner slide; the slide is fixed to the bottom end of the inner slide, and the top surface of the slide is in sliding contact with the bottom surface of the guide rail assembly; the top end of the inner slide is fixedly connected to a suspension slide rod slidably mounted on the inner side of the guide rail assembly; The security component includes a connecting seat, a movable ear block, an electrode strip and a power connection box fixed on the inner side of the sliding seat. A number of electrode columns for powering the excitation body are fixedly installed on the inner side of the power connection box. There are two movable ear blocks and they are slidably installed on the inner side of the power connection box. The two ends of the electrode strip are connected to the opposite inner sides of the two movable ear blocks, and the electrode strip is in contact with the surface of the electrode column in the initial state. The electrode strip is an elastic electrode strip structure, which is used to break away from contact with the surface of the electrode column in a bent state. A sliding rod is fixedly installed on the surface of the connecting seat, and the movable ear block is slidably installed on the surface of the sliding rod.

[0008] In a preferred example, the present invention can be further configured as follows: the stator group includes a yoke body and two electromagnetic coils arranged on the surface of the yoke body, the yoke body is U-shaped, the two electromagnetic coils are symmetrically arranged about the surface of the slide, and the inner spacing of the yoke body is greater than or equal to the thickness of the inner slide surface, and an alternating current is connected to the electromagnetic coils to generate a constant vertical magnetic field on the inner side of the yoke body, and the magnetic poles of adjacent stator groups are in opposite directions. The yoke body and the symmetrically arranged electromagnetic coils form a stable, vertical magnetic field structure that can efficiently couple with the excitation body in space and improve the efficiency of the electromagnetic force; the U-shaped yoke structure and the design of opposite directions of adjacent stator magnetic poles further enhance the driving force and energy efficiency conversion capabilities of the motor. In a preferred embodiment, the present invention can be further configured as follows: the excitation magnet is embedded in and extends through the surfaces of both sides of the inner slide, arranged opposite the end faces of the electromagnetic coil. The excitation magnet includes a magnetic core and an excitation coil fixedly wound around the outer periphery of the core. A controlled alternating current is supplied through the excitation coil, causing the excitation magnet to generate a magnetic field with alternating directions. The combination of the magnetic core and the excitation coil in the excitation magnet structure controls the direction of the magnetic field through the alternating current, achieving dynamic interaction with the stator magnetic field, forming a highly efficient electromagnetic repulsive force, and improving the response speed and control accuracy of the mover's motion.

[0009] In a preferred example, the present invention can be further configured as follows: hanging sliding ears are fixedly installed on both sides of the slide seat, the surface of the guide rail group is provided with a sliding groove adapted to the hanging sliding ears, a plurality of balls are embedded and installed on the surface of the hanging slide rod, and the balls are in sliding contact with the inner side of the guide rail group, and the diameter of the hanging slide rod is greater than the thickness of the inner slide plate.

[0010] Through the above technical solution, by setting the lifting lugs and cooperating with the guide rail grooves, the precise positioning and limit guiding of the mover in the guide rail can be achieved; the ball structure reduces sliding friction, improves operation smoothness and driving efficiency, and ensures the long-term reliable operation of the shield door in high-speed and frequent operation scenarios.

[0011] In a preferred example, the present invention can be further configured as follows: there are a plurality of mover groups, and the bottom surfaces of the mover groups are connected to the subway screen door via a connecting seat, and the spacing between each mover group is greater than twice the width of the inner slide.

[0012] Through the above technical solution, multiple mover groups are arranged and connected to the shield door, which can achieve uniform force and synchronous drive for the entire door, and improve the balance and stability of the opening and closing process; the optimized spacing avoids interference between movers, which is conducive to the modular expansion and maintenance of the system.

[0013] In a preferred example, the present invention can be further configured as follows: the electrical connection box and the movable ear block are both insulating material components, the number of the electrode strips is two and they are arranged parallel to each other, and they are in contact with each other on both sides of the electrode column, and the two electrode strips are respectively electrically connected to the two poles of the excitation body through the electrode column.

[0014] Through the above technical solution, the electrical connection box and movable ear block structure made of insulating materials are used to effectively isolate the electrical circuit and improve system safety; the elastic structure of the electrode strips and electrode columns can quickly cut off the power under obstruction conditions, realizing delay-free anti-pinch protection control.

[0015] In a preferred example, the present invention can be further configured as follows: the number of excitation bodies on the surface of the inner slide is odd, and the polar directions of the coils on the surfaces of adjacent excitation coils are oriented so that the magnetic poles generated by adjacent excitation coils are in opposite directions.

[0016] Through the above technical solution, the excitation bodies are arranged as an odd number, and the polarities of adjacent excitation coils are made opposite, which can effectively form a periodic alternating magnetic pole array, improve the linear thrust density of the electromagnetic drive system, and thus improve the operating efficiency and positioning accuracy of the drive system.

[0017] In a preferred embodiment, the present invention can be further configured as follows: one side of each of the two movable ear blocks abuts against the inner wall of the electrical box; a protrusion for fixing a slide rod is provided on the top surface of the connecting seat; the slide rod is arranged parallel to the electrical box and the surface of the connecting seat; one side of the two movable ear blocks abuts against one side of the two protrusions respectively; Specifically, when the movement of the subway shielding door is obstructed, that is, when the anti-pinch protection is triggered, the movement resistance of the iron shielding door is manifested as the thrust of the convex column on the surface of the connecting seat on the movable ear block on one side, and the restriction of the electrical box makes the movable ear block on the other side remain stationary, and a relative movement effect occurs between the two movable ear blocks, squeezing the two electrode strips on the inside to deform and bend, that is, the two electrode strips bend and break away from the contact with the surface of the electrode column, thereby realizing power failure and shutdown of the exciter, and can be connected to alarm prompt and shutdown control systems to realize automatic alarm and shutdown. This mechanical protection structure can effectively prevent pinching and avoid burning of internal components; after the motor is completely powered off, the electrode strips can elastically recover.

[0018] The beneficial effects achieved by the present invention are: 1. In the present invention, by integrating security components into the drive motor and adopting a power-off protection structure in which elastic electrode strips, movable ear blocks, and a power connection box work together, the shield door can actively shut down and issue an alarm when encountering an obstruction during operation, significantly improving the system's anti-pinch capability and operational safety, and avoiding personal injury and equipment damage.

[0019] 2. In the present invention, an electromagnetically driven, fully electrically excited linear motion method is adopted, eliminating the traditional rotary transmission structure. Combined with a low-friction sliding guide and a precisely coupled electromagnetic system, the shield door can achieve rapid response, smooth operation, and significantly reduce noise when opening and closing. It is very suitable for the dual requirements of quietness and speed in subway environments.

[0020] 3. In the present invention, a magnet-free structure design is adopted, which relies entirely on electromagnetic coil excitation to form a magnetic field drive, avoiding the risk of performance degradation of permanent magnets under high temperature or strong impact, while reducing manufacturing and maintenance costs and improving the thermal stability and service life of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic side structural diagram of a guide rail assembly according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the exploded structure of a guide rail assembly according to an embodiment of the present invention; Figure 4 This is a schematic structural diagram of a moving assembly and a security component according to an embodiment of the present invention; Figure 5 This is a schematic structural diagram of a stator assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the exploded structure of the moving assembly and security components according to one embodiment of the present invention; Figure 7 This is a schematic diagram of the exploded structure of a security component according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the electrode column structure according to an embodiment of the present invention; Figure 9 Schematic diagram of the structure of electrode strips and electrode columns in contact and non-contact states according to one embodiment of the present invention.

[0022] Reference numerals: 100, guide rail assembly; 110, stator assembly; 111, yoke body; 112, electromagnetic coil; 200, mover assembly; 210, slide seat; 220, inner slide plate; 230, excitation magnet; 211, hanging slide lug; 221, hanging slide rod; 231, magnetic core; 232, excitation coil; 300, security component; 310, connecting seat; 320, movable ear block; 330, electrode strip; 340, electrical box; 311, sliding rod; 341, electrode column. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0024] It is to be understood that these descriptions are illustrative only and are not intended to limit the scope of the invention.

[0025] A subway screen door driving motor provided by some embodiments of the present invention will be described below with reference to the accompanying drawings.

[0026] Combine Figures 1-9 As shown, a subway screen door driving motor provided by the present invention includes a guide rail assembly 100 , a mover assembly 200 and a security assembly 300 .

[0027] The guide rail assembly 100 is equipped with several stator assemblies 110 arranged in a straight line on its inner side. These stator assemblies 110 include a magnetic yoke 111 and two electromagnetic coils 112 arranged on the surface of the yoke 111. The yoke 111 is U-shaped, and the two electromagnetic coils 112 are symmetrically arranged about the surface of the slide 210. The spacing between the two electromagnetic coils 112 on the inner side of the yoke 111 is greater than or equal to the surface thickness of the inner slide 220. When an alternating current is applied to the electromagnetic coils 112, a constant vertical magnetic field is generated on the inner side of the yoke 111. The magnetic poles of adjacent stator assemblies 110 are oriented in opposite directions, thus forming a periodically alternating driving magnetic field structure.

[0028] The mover group 200 includes a slide 210, an inner slide 220 and an excitation magnet 230. The slide 210 is fixedly connected to the bottom end of the inner slide 220, and the top surface of the slide 210 slides and abuts against the bottom surface of the guide rail group 100 to realize the linear movement of the mover group 200. The top of the inner slide 220 is fixedly connected to a hanging slide 221 that is slidably mounted on the inner side of the guide rail group 100. Hanging lugs 211 are fixedly mounted on both sides of the slide 210, and the hanging lugs 211 cooperate with the slide grooves provided on the surface of the guide rail group 100 to provide lateral sliding guidance. A number of balls are embedded in the surface of the hanging slide 221, and the balls slide and abut against the inner side of the guide rail group 100, thereby further reducing friction resistance and improving sliding smoothness; the diameter of the hanging slide 221 is greater than the thickness of the inner slide 220.

[0029] The excitation magnets 230 are embedded in and extend through both sides of the inner slide 220, and are arranged opposite the end faces of the electromagnetic coils 112 in the stator assembly 110. The excitation magnets 230 include a magnetic core 231 and an excitation coil 232 wound and fixed to the outer circumference of the magnetic core 231. When an alternating current with a controlled frequency that matches the phase sequence is passed through the excitation coils 232, the excitation magnets 230 generate a magnetic field with alternating directions. Multiple excitation magnets 230 are arranged in odd numbers on the surface of the inner slide 220, and the winding directions of adjacent excitation coils 232 are arranged in polar orientation, so that adjacent excitation coils 232 generate magnetic poles in opposite directions.

[0030] There are multiple movable groups 200, each connected to the subway platform screen door via a connector 310, enabling synchronized opening and closing of the platform screen door. To ensure smooth operation and optimal spatial arrangement, the spacing between movable groups 200 is greater than twice the width of the inner slide 220.

[0031] In order to realize the automatic power cut-off and anti-pinch protection functions under abnormal conditions, the present invention further provides a security component 300. The security component 300 includes a connecting seat 310, a movable ear block 320, an electrode strip 330 and a power connection box 340.

[0032] The electrical box 340 is fixedly mounted on the inner side of the slide 210 and is made of insulating material. A plurality of electrode posts 341 for supplying power to the excitation element 230 are fixedly mounted on the inner side of the electrical box 340. The electrode posts 341 are electrically connected to the two poles of the excitation element 230 respectively.

[0033] There are two movable ear blocks 320, both of which are made of insulating material and are slidably installed on the inner side of the connection box 340. The two are jointly installed on the sliding rod 311 provided on the top surface of the connecting base 310. The sliding rod 311 is fixed to the surface of the connecting base 310 through a protruding column and is arranged parallel to the surface direction of the connection box 340 and the connecting base 310.

[0034] In this embodiment, one side of each movable lug 320 abuts the inner wall of the electrical box 340, while the other side is connected to the electrode strip 330 via its ends. The electrode strips 330 are two elastic electrode structures, arranged parallel to each other within the interior of the electrical box 340 and abutting against the surfaces of the electrode posts 341. During normal system operation, the electrode strips 330, through their elastic structure, adhere to the electrode posts 341, providing power to the exciter 230.

[0035] If an obstacle occurs during operation of the shield door, such as a jam, obstruction by foreign objects, or a person being caught, the sliding rod 311 on the surface of the connecting base 310 transmits resistance to the movable lug 320 via the protruding column at its end, causing one movable lug 320 to move relative to the sliding rod 311 while the other remains stationary. This relative movement causes the electrode strip 330 to deform, breaking contact with the electrode column 341, thereby disconnecting the power supply circuit of the excitation element 230 and achieving active shutdown protection. An alarm can be connected to a warning structure to trigger an abnormal power outage.

[0036] After the fault is resolved, the electrode strip 330 recovers its contact with the electrode column 341 by virtue of its elastic recovery ability, and the excitation current is reconnected, thereby restoring the driving function and allowing the shield door to continue to complete the opening and closing tasks.

[0037] Through the coordination of the above structure, the present invention realizes efficient, safe and stable opening and closing drive of the subway platform screen door, and provides reliable shutdown and alarm protection under abnormal circumstances, which significantly improves the overall reliability and safety of the system.

[0038] The working principle and use process of the present invention: The present invention provides a subway screen door drive motor that achieves linear opening and closing drive control of the screen door through electromagnetic interaction between the stator assembly 110 and the mover assembly 200. It also incorporates security components to provide power-off protection and anti-pinch functions. Its operating principle and usage process are as follows: When the control system applies AC excitation current to each electromagnetic coil 112 in the stator assembly 110, a magnetic field with a stable magnitude and constant direction is formed within the yoke body 111, with magnetic flux lines perpendicular to the surface of the inner slide 220. This magnetic field structure is symmetrically distributed about the inner slide 220 of the mover assembly 200 and forms a coupling relationship with the excitation magnet 230 in the mover assembly.

[0039] The control system synchronously feeds an alternating current with a controlled frequency and phase sequence matching the excitation coil 232 in the excitation element 230, causing the excitation element 230 to generate a magnetic field of constant magnitude and alternating direction. The interaction between the stator's magnetic pole distribution and the mover's magnetic polarity creates a periodically alternating electromagnetic repulsive force between the mover and stator, which in turn propels the mover assembly 200 to slide along the horizontal linear path of the guide rail assembly 100, thereby achieving smooth opening and closing of the screen door.

[0040] When the shield door encounters an obstruction during operation, such as a foreign object getting stuck or someone grabbing it, the resistance causes the projections on the top surface of the connector 310, located on either end of the slide bar 311, to exert relative thrust on the movable lug 320. Restricted by the electrical connection box 340, one of the movable lugs 320 moves while the other remains stationary, resulting in relative displacement. This causes the central electrode strip 330 to deform and bend, breaking contact with the electrode column 341 and severing the power supply circuit to the exciter 230, achieving an active power-off shutdown. This allows the shield door to shut down if obstructed on either side during operation. A shutdown or alarm signal can also be output, prompting manual intervention to prevent damage to motor components or the risk of personal entrapment.

[0041] After the fault is handled, the electrode strip 330 can be restored to contact with the electrode column 341 through elastic recovery, the excitation current can be reconnected, the actuator drive function can be restored, and the subsequent opening and closing tasks of the shield door can be continued.

[0042] In summary, the present invention drives the shield door to slide linearly through the full electric excitation principle and combines the electrode power-off protection structure to ensure the reliability of the motor structure and significantly improve the safety and response efficiency of the shield door opening and closing control.

[0043] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative uses of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0044] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A subway screen door drive motor, characterized in that: include: A guide rail group (100), a mover group (200) and a security component (300), wherein a plurality of stator groups (110) arranged in a straight line are provided on the inner side of the guide rail group (100), the mover group (200) comprises a slide seat (210), an inner slide plate (220) and an excitation body (230) embedded and mounted on the surface of the inner slide plate (220), the slide seat (210) is fixed to the bottom end of the inner slide plate (220), and the top surface of the slide seat (210) is in sliding contact with the bottom surface of the guide rail group (100), and the top end of the inner slide plate (220) is fixedly connected to a suspension slide rod (221) slidably mounted on the inner side of the guide rail group (100); The security component (300) includes a connecting seat (310), a movable ear block (320), an electrode strip (330) and a power connection box (340) fixed on the inner side of the slide seat (210); a plurality of electrode posts (341) for supplying power to the excitation body (230) are fixedly installed on the inner side of the power connection box (340); the number of the movable ear blocks (320) is two and they are slidably installed on the inner side of the power connection box (340); the two ends of the electrode strip (330) are connected to the opposite inner sides of the two movable ear blocks (320), and the electrode strip (330) is in contact with the surface of the electrode post (341) in the initial state; the electrode strip (330) is an elastic electrode strip structure and is used to break away from the surface contact with the electrode post (341) in a bent state; a sliding rod (311) is fixedly installed on the surface of the connecting seat (310), and the movable ear block (320) is slidably installed on the surface of the sliding rod (311).

2. A subway screen door drive motor according to claim 1, characterized in that: The stator group (110) comprises a yoke body (111) and two electromagnetic coils (112) arranged on the surface of the yoke body (111); the yoke body (111) is U-shaped; the two electromagnetic coils (112) are symmetrically arranged about the surface of the slide seat (210); and the inner side spacing of the yoke body (111) is greater than or equal to the surface thickness of the inner slide plate (220); an alternating current is connected to the electromagnetic coils (112) to generate a constant vertical magnetic field inside the yoke body (111); and the magnetic poles of adjacent stator groups (110) are in opposite directions.

3. The subway screen door drive motor according to claim 1, characterized in that: The excitation body (230) is embedded in and penetrates the surfaces of both sides of the inner slide plate (220), and is arranged opposite to the end face of the electromagnetic coil (112). The excitation body (230) includes a magnetic core (231) and an excitation coil (232) wound and fixed on the outer periphery of the magnetic core (231). A controlled alternating current is connected through the excitation coil (232), so that the excitation body (230) generates a magnetic field with alternating directions.

4. The subway screen door drive motor according to claim 1, characterized in that: Hanging lugs (211) are fixedly installed on both sides of the slide seat (210), and the surface of the guide rail group (100) is provided with a slide groove adapted to the hanging lugs (211). A plurality of balls are embedded and installed on the surface of the hanging slide rod (221), and the balls are in sliding contact with the inner side of the guide rail group (100), and the diameter of the hanging slide rod (221) is greater than the thickness of the inner slide plate (220).

5. The subway screen door driving motor according to claim 1, characterized in that: There are a plurality of movable subgroups (200), and the bottom surfaces of the movable subgroups (200) are connected to the subway screen door via a connecting seat (310), and the spacing between the movable subgroups (200) is greater than twice the width of the inner slide plate (220).

6. The subway screen door drive motor according to claim 1, characterized in that: The electrical connection box (340) and the movable ear block (320) are both made of insulating material. There are two electrode strips (330) arranged in parallel with each other and in contact with both sides of the electrode column (341). The two electrode strips (330) are respectively electrically connected to the two poles of the excitation body (230) through the electrode column (341).

7. The subway screen door drive motor according to claim 1, characterized in that: The number of excitation bodies (230) on the surface of the inner slide (220) is odd, and the surface coil directions of adjacent excitation coils (232) are polar, so that the magnetic poles generated by adjacent excitation coils (232) are in opposite directions.

8. The subway screen door drive motor according to claim 1, characterized in that: One side of the two movable ear blocks (320) abuts against the inner wall of the electrical box (340); a convex column for fixing the slide rod (311) is provided on the top surface of the connecting seat (310); the slide rod (311) is arranged parallel to the surface direction of the electrical box (340) and the connecting seat (310); one side of the two movable ear blocks (320) abuts against one side of the two convex columns respectively.

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