An elevator control method, an elevator control device, and a storage medium

Abstract

The embodiment of the application discloses an elevator control method, an elevator control device and a storage medium, and is used in the technical field of elevator control. The method comprises the following steps: when the elevator is in a fault parking state, a star contactor is closed by closing a star short-circuit current, so that the star contactor is operated under a safe current, and damage of the star contactor is effectively avoided; and when the elevator is in a normal parking state and an abnormal parking state, the star process is quickly braked by controlling the opening or closing of an output contactor and the star contactor, and delay of the star action can be effectively avoided. It can be seen that the embodiment of the application can ensure that the star contactor quickly brakes the elevator under the safe current.

Description

Technical Field

[0001] This application relates to the field of elevator control technology, and in particular to an elevator control method, an elevator control device, and a storage medium. Background Technology

[0002] Permanent magnet synchronous traction machines (permanent magnet synchronous motors) possess superior dynamic response performance, high power density, and low energy consumption, and have been widely used in the field of elevator drive units. The brake of the traction machine, as an elevator braking and protection device, is a critical component for the safe operation of the elevator. Insufficient or failed mechanical braking force of the brake can cause elevator slippage or runaway, easily leading to accidents such as overshooting, bottoming out, or shearing. In such cases, a star-shaped braking system is required.

[0003] Star-connection braking refers to star-short-circuiting the three-phase windings of a permanent magnet synchronous traction machine using external wiring or its own circuitry, thus forming a closed electrical circuit. The purpose of star-connection is to short-circuit the three-phase windings of the permanent magnet synchronous traction machine (i.e., the motor) in a star configuration when it loses external power or the brake fails. This transforms the motor into a generator, using the electromagnetic torque generated during the rotation of the traction sheave to compensate for the mechanical torque resulting from the unequal weight of the counterweight and the car. Mechanical energy is converted into electrical energy and dissipated as heat within the resistance of the closed circuit, thereby reducing the elevator speed and maintaining a constant low-speed operation.

[0004] However, due to the limited capacity of the sealing contactor, if the sealing is applied directly when the elevator is running at high speed, the instantaneous current of the sealing will far exceed the rated current of the sealing contactor, which will damage the sealing contactor. If a delay circuit is added to the hardware, the sealing action will be delayed after normal shutdown, which may cause the sealing to fail in case of brake malfunction. Summary of the Invention

[0005] This application provides an elevator control method, an elevator control device, and a storage medium, which can ensure that the sealing contactor can quickly brake the elevator under a safe current.

[0006] This application provides an elevator control method, applied to an elevator control system, including:

[0007] When the elevator is in a normal stopped state, after the control sealing contactor is closed, the output contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator; the elevator control system is connected to the permanent magnet synchronous motor through the output contactor and the sealing contactor.

[0008] When the elevator is in a fault stop state, the output contactor is kept closed to obtain the star-sealed short-circuit current of the permanent magnet synchronous motor, and the star-sealed contactor is closed based on the star-sealed short-circuit current.

[0009] When the sealing contactor is closed, the sealing contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor, and the output contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator.

[0010] Furthermore, the disconnection of the output contactor based on the three-phase output current of the permanent magnet synchronous motor or the operating speed of the elevator includes:

[0011] Once the contacts of the sealing contactor are closed, if the three-phase output current of the permanent magnet synchronous motor is less than a preset current threshold, or if the running speed of the elevator is less than a preset speed threshold, then the output contactor is disconnected.

[0012] Furthermore, obtaining the star-sealed short-circuit current of the permanent magnet synchronous motor includes:

[0013] When the permanent magnet synchronous motor is operating in a short-circuit braking state, the motor speed input current formula of the permanent magnet synchronous motor is:

[0014]

[0015] The star-sealed short-circuit current I of the permanent magnet synchronous motor is obtained, where ω r R is the motor speed. s For the stator resistance, λ f For rotor flux, L d It is the d-axis inductance.

[0016] Furthermore, closing the star-sealing contactor based on the star-sealing short-circuit current includes:

[0017] If the short-circuit current of the sealing star is less than the first rated current corresponding to the sealing star contactor, then the sealing star contactor is closed.

[0018] Furthermore, the disconnection of the star-sealing contactor based on the three-phase output current of the permanent magnet synchronous motor includes:

[0019] When the sealing contactor is closed, the three-phase output current of the permanent magnet synchronous motor is detected;

[0020] If the effective value of the three-phase output current is greater than the second rated current corresponding to the star-sealing contactor, then the star-sealing contactor is disconnected.

[0021] Furthermore, when the elevator is in a normal stopped state, controlling the closing of the sealing contactor includes:

[0022] After the elevator has been running at zero speed for a preset time, the pulse broadband modulation (PWM) wave transmission to the permanent magnet synchronous motor is turned off.

[0023] After a preset short delay, the sealing contactor is controlled to close.

[0024] Furthermore, the method also includes: detecting the operating status of the elevator based on preset fault detection rules, so as to determine whether the elevator is operating in a normal stopping state or a fault stopping state.

[0025] This application also provides an elevator control device, applied to an elevator control system, including:

[0026] The disconnection unit is used to disconnect the output contactor based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator after the control star contactor is closed when the elevator is in normal parking state; the elevator control system is connected to the permanent magnet synchronous motor through the output contactor and the star contactor.

[0027] A closing unit is used to control the output contactor to remain closed when the elevator is in a fault stop state, obtain the star-sealed short-circuit current of the permanent magnet synchronous motor, and close the star-sealed contactor based on the star-sealed short-circuit current;

[0028] An execution unit is configured to disconnect the sealing contactor based on the three-phase output current of the permanent magnet synchronous motor after the sealing contactor is closed, and to disconnect the output contactor based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator.

[0029] This application also provides an elevator control device, including:

[0030] Central processing unit, memory, input / output interface, wired or wireless network interface, power supply;

[0031] The memory is either a short-term storage memory or a persistent storage memory;

[0032] The central processing unit is configured to communicate with the memory and execute instructions in the memory on a control plane functional entity to perform the methods described above.

[0033] This application also provides a computer-readable storage medium, characterized in that the computer-readable storage medium includes instructions that, when executed on a computer, cause the computer to perform the method described above.

[0034] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0035] In this embodiment, when the elevator is in a normal stopped state, after the control sealing contactor is closed, the output contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor or the elevator's running speed. The elevator control system is connected to the permanent magnet synchronous motor through the output contactor and the sealing contactor. When the elevator is in a fault stopped state, the control output contactor remains closed, the sealing short-circuit current of the permanent magnet synchronous motor is obtained, and the sealing contactor is closed based on the sealing short-circuit current. After the sealing contactor is closed, the sealing contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor, and the output contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor or the elevator's running speed.

[0036] Specifically, when the elevator is in a fault-stopped state, the sealing contactor is closed by the sealing short-circuit current, and the sealing contactor is opened by the three-phase output current based on the permanent magnet synchronous motor, ensuring that the sealing contactor operates under a safe current and effectively preventing damage to the sealing contactor. Furthermore, in normal and abnormal stopping states, rapid braking during the sealing process is achieved by controlling the opening and closing of the output contactor and the sealing contactor, effectively avoiding delays in sealing action. Therefore, the embodiments of this application can ensure that the sealing contactor can rapidly brake the elevator under a safe current. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0038] Figure 1 This is a flowchart of an elevator control system disclosed in an embodiment of this application;

[0039] Figure 2 This is a structural diagram of an elevator control system disclosed in an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of an elevator control device disclosed in an embodiment of this application;

[0041] Figure 4 This is a schematic diagram of another elevator control device disclosed in an embodiment of this application. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0043] In the description of the embodiments of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0044] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0045] Star-connection braking refers to star-short-circuiting the three-phase windings of a permanent magnet synchronous traction machine (permanent magnet synchronous motor) using external lines or its own circuitry, thus forming a closed electrical circuit. The purpose of star-connection is to short-circuit the three-phase windings in a star configuration when the permanent magnet synchronous traction machine (i.e., the motor) loses external power or the brake fails. This transforms the motor into a generator, using the electromagnetic torque generated during the rotation of the traction sheave to compensate for the mechanical torque resulting from the unequal weight of the counterweight and the car. Mechanical energy is converted into electrical energy and dissipated as heat within the resistance of the closed circuit, thereby reducing the elevator speed and maintaining a constant low-speed operation.

[0046] However, due to the limited capacity of the sealing contactor, if the sealing is applied directly when the elevator is running at high speed, the instantaneous current will far exceed the rated current of the sealing contactor, damaging it. Furthermore, if a delay circuit is added to the hardware, the sealing action will be delayed after a normal stop, potentially causing the sealing to fail in case of brake malfunction. Therefore, this application provides an elevator control method. The applied elevator control system ensures that the sealing contactor can rapidly brake the elevator under safe current conditions. Figure 1 As shown, the specific steps include the following:

[0047] 101. When the elevator is in normal parking state, the output contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor or the elevator's running speed.

[0048] In this embodiment, the elevator control system is connected to the permanent magnet synchronous motor via an output contactor and a sealing contactor, such as... Figure 2 As shown, the elevator control system is connected to the permanent magnet synchronous motor (PMSM) via output contactor Y and sealing contactor FX. The elevator control system samples the three-phase output current through a three-phase instantaneous value detection module and detects the speed signal from encoder PG through an encoder speed detection module to control the operation of the PMSM. It can be understood that the sealing contactor is used to achieve short-circuit braking of the PMSM; the PMSM is used to control the power supply for the elevator's operation; and the elevator control system uses the output contactor to perform pulse width modulation on the PMSM to achieve elevator operation.

[0049] Generally, the control logic of an elevator control system is as follows: when the elevator stops, the output contactor opens and the star contactor closes; when the elevator starts running, the star contactor opens and the output contactor closes, and the elevator control system begins pulse width modulation (PWM) waveform generation; when the elevator stops, the elevator control system shuts down PWM waveform generation, the output contactor opens, and after a delay, the star contactor closes. However, when the output contactor is opened during elevator stops, current may exist on the output contactor, which can easily cause arcing and damage to the output contactor due to the presence of current.

[0050] Therefore, in this embodiment, when the elevator is in a normal stopping state, after the control star contactor closes, the output contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor or the elevator's running speed. That is, when the elevator is in a non-stop running state, the star contactor is disconnected and the output contactor is closed. When the elevator transitions from a non-stop running state to a normal stopping state, after the control star contactor closes, the output contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor or the elevator's running speed.

[0051] Understandably, when the elevator is in a normal stopping state, the process of controlling the sealing contactor to close can be as follows: after the elevator has been running at zero speed for a preset time, the pulse broadband modulation (PWM) wave transmission to the permanent magnet synchronous motor is turned off. That is, during normal elevator stopping, when the elevator's set speed is zero and the elevator's feedback speed is zero, the elevator control system controls the elevator brake signal to close. After detecting that the elevator brake is closed, the elevator control system turns off the PWM wave transmission after running at zero speed for a preset time. This preset time is generally between 0.5 and 2 seconds, and is not specifically limited here. When the PWM wave transmission is turned off, after a preset short time interval T, the elevator control system controls the sealing contactor to close. This preset short time interval T can be 2 milliseconds or 3 milliseconds, and is not specifically limited here.

[0052] Specifically, once the sealing contactor's contacts are closed (i.e., the elevator control system detects the closure of the sealing contactor's feedback contacts), the elevator control system can detect the three-phase output currents Iu, Iv, and Iw of the permanent magnet synchronous motor. If the three-phase output current of the permanent magnet synchronous motor is less than a preset current threshold (which can be one-tenth or one-eighth of the motor's rated current, without specific limitation here), or if the elevator control system detects that the elevator's running speed is less than a preset speed threshold (which can be 0.002 m / s or 0.003 m / s, without specific limitation here), then the output contactor is disconnected. It can be understood that when the elevator's running speed is less than the preset speed threshold, the three-phase output current of the permanent magnet synchronous motor tends to be zero. Disconnecting the output contactor when the three-phase output current tends to be zero effectively avoids arcing damage to the output contactor.

[0053] At this time, the sealing contactor can be quickly connected (i.e., closed) within a preset short time period T, ensuring that even if the elevator brake malfunctions, the sealing contactor will connect at a very low elevator speed, ensuring that the sealing contactor can play a protective role. This is because if the elevator speed is too high, the sealing contactor will not be able to achieve its short-circuit braking function if it connects too late.

[0054] 102. When the elevator is in a fault-stopped state, the star-sealed contactor is closed based on the star-sealed short-circuit current of the permanent magnet synchronous motor.

[0055] In this embodiment, when the elevator is stopping, a malfunction may occur. When the elevator is in a malfunction stop state, the elevator control system shuts down the PWM wave generation, controls the elevator brake signal to shut down, and controls the output contactor to remain closed. At this time, the motor speed of the permanent magnet synchronous motor can be detected in real time, the star-sealed short-circuit current of the permanent magnet synchronous motor can be obtained based on the motor speed, and the star-sealed short-circuit current can be used to close the star-sealed contactor.

[0056] It is understandable that the elevator's operating status can be detected based on preset fault detection rules to determine whether the elevator is in a normal stopping state or a fault stopping state. The preset fault detection rules can be for detecting the elevator's corresponding brake or the elevator's safety circuit, etc., and are not limited here. If a fault is detected in the brake or safety circuit, it can be determined that the elevator is in a fault stopping state; if no fault is detected, it can be determined that the elevator is in a normal stopping state.

[0057] It is understandable that the permanent magnet synchronous motors used in elevators are surface-mount synchronous motors. In the rotating coordinate system equations of a permanent magnet synchronous motor, L d and L q The inductances are dq-axis inductances and are approximately equal, ω r The motor speed is the angular velocity; when the permanent magnet synchronous motor is operating in short-circuit braking state, the stator voltage v on the dq axis is... d ,v q =0, so the current formula (the equation for effective current and velocity) can be obtained as follows:

[0058]

[0059] By inputting the motor speed of the permanent magnet synchronous motor into the current formula, the star-sealed short-circuit current I of the permanent magnet synchronous motor can be obtained, where R s For the stator resistance, λ f This is the rotor flux.

[0060] After receiving the short-circuit current of the sealing contactor, the sealing contactor is closed based on the short-circuit current of the permanent magnet synchronous motor. Specifically, if the short-circuit current is less than the first rated current of the sealing contactor, the elevator control system controls the sealing contactor to close. This first rated current can be 1.4 or 1.5 times the rated current of the sealing contactor; the specific value is not limited here. This first rated current can be understood as the allowable current of the sealing contactor; that is, the decision to connect the sealing contactor is made by comparing the short-circuit current with the allowable current.

[0061] Understandably, when the short-circuit current of the sealing star is greater than or equal to the first rated current corresponding to the sealing star contactor, the short-circuit current of the sealing star is continuously detected based on the motor speed of the permanent magnet synchronous motor until the short-circuit current of the sealing star is less than the first rated current corresponding to the sealing star contactor, and then the sealing star contactor is closed.

[0062] It is understandable that the specific order of execution between step 102 and step 101 above is not limited here; the corresponding steps are executed according to the elevator's stopping status.

[0063] 103. Three-phase output current disconnection star contactor based on permanent magnet synchronous motor.

[0064] After the sealing contactor is connected, the three-phase output current of the permanent magnet synchronous motor can be monitored to ensure the safety of the sealing contactor; that is, after the sealing contactor is closed, it can be disconnected based on the three-phase output current of the permanent magnet synchronous motor. Specifically, when the sealing contactor is closed, the elevator control system can detect the three-phase output current of the permanent magnet synchronous motor in real time; if the effective value of the three-phase output current is greater than the second rated current corresponding to the sealing contactor, the sealing contactor will be disconnected. This second rated current is greater than the first rated current, and can be 1.8 times or 1.9 times the rated current of the sealing contactor; the specific value is not limited here.

[0065] Understandably, after disconnecting the star-sealing contactor, step 102 can be repeated: closing the star-sealing contactor based on the star-sealing short-circuit current of the permanent magnet synchronous motor, so that the star-sealing contactor is connected under safe current.

[0066] 104. Based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator, disconnect the output contactor.

[0067] After the sealing contactor is closed, the output contactor can be disconnected based on the three-phase output current of the permanent magnet synchronous motor or the elevator's running speed. Specifically, if the three-phase output current of the permanent magnet synchronous motor is less than a preset current threshold, or if the elevator's running speed is less than a preset speed threshold, the output contactor will be disconnected. The specific process is similar to step 101 above, and will not be repeated here.

[0068] As can be seen, in the real-time example of this application, when the elevator is in a fault-stopped state, the sealing contactor is closed by the sealing short-circuit current, and the sealing contactor is opened by the three-phase output current based on the permanent magnet synchronous motor, so that the sealing contactor operates under a safe current, effectively avoiding damage to the sealing contactor; and in normal and abnormal stopping states, rapid braking of the sealing process is achieved by controlling the opening or closing of the output contactor and the sealing contactor, which can effectively avoid delay in sealing action. Therefore, the embodiments of this application can ensure that the sealing contactor can rapidly brake the elevator under a safe current.

[0069] This application also provides an elevator control device, applied to an elevator control system, such as... Figure 3 As shown, it includes:

[0070] The disconnection unit 301 is used to disconnect the output contactor based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator after the control star contactor is closed when the elevator is running in the normal parking state; the elevator control system is connected to the permanent magnet synchronous motor through the output contactor and the star contactor.

[0071] The closing unit 302 is used to control the output contactor to remain closed when the elevator is running in a fault stop state, to obtain the star-sealed short-circuit current of the permanent magnet synchronous motor, and to close the star-sealed contactor based on the star-sealed short-circuit current;

[0072] The execution unit 303 is used to disconnect the sealing contactor based on the three-phase output current of the permanent magnet synchronous motor after the sealing contactor is closed, and to disconnect the output contactor based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator.

[0073] This application embodiment also provides an elevator control device 400, such as... Figure 4 As shown, the elevator control device 400 of this application embodiment may include one or more central processing units (CPUs) 401 and a memory 402, wherein the memory 402 stores one or more application programs or data.

[0074] The memory 402 can be volatile or persistent storage. The program stored in the memory 402 can include one or more modules, each module including a series of instruction operations on the electronic device. Furthermore, the central processing unit 401 can be configured to communicate with the memory 402 and execute the series of instruction operations stored in the memory 402 on the elevator control device 400.

[0075] The elevator control device 400 may also include one or more power supplies 405, one or more wired or wireless network interfaces 404, one or more input / output interfaces 403, and / or one or more operating systems, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™, etc.

[0076] The central processing unit 401 can perform the operations performed by the first aspect or any specific method embodiment of the first aspect, which will not be described in detail here.

[0077] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0078] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0079] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0080] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0081] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. An elevator control method, applied to an elevator control system, characterized in that, include: When the elevator is in a normal stopped state, after the control sealing contactor is closed, the output contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator; the elevator control system is connected to the permanent magnet synchronous motor through the output contactor and the sealing contactor. When the elevator is in a fault stop state, the output contactor is kept closed to obtain the star-sealed short-circuit current of the permanent magnet synchronous motor, and the star-sealed contactor is closed based on the star-sealed short-circuit current. When the sealing contactor is closed, the sealing contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor, and the output contactor is disconnected based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator.

2. The elevator control method according to claim 1, characterized in that, The three-phase output current based on the permanent magnet synchronous motor or the running speed of the elevator, the disconnection of the output contactor includes: Once the contacts of the sealing contactor are closed, if the three-phase output current of the permanent magnet synchronous motor is less than a preset current threshold, or if the running speed of the elevator is less than a preset speed threshold, then the output contactor is disconnected.

3. The elevator control method according to claim 1, characterized in that, The process of obtaining the star-sealed short-circuit current of the permanent magnet synchronous motor includes: When the permanent magnet synchronous motor is operating in a short-circuit braking state, the motor speed input current formula of the permanent magnet synchronous motor is: ； The star-sealed short-circuit current I of the permanent magnet synchronous motor is obtained, wherein, This refers to the motor speed. For stator resistance, For rotor flux, It is the d-axis inductance.

4. The elevator control method according to claim 1, characterized in that, The method of closing the star-sealing contactor based on the star-sealing short-circuit current includes: If the short-circuit current of the sealing star is less than the first rated current corresponding to the sealing star contactor, then the sealing star contactor is closed.

5. The elevator control method according to claim 1, characterized in that, The method of disconnecting the star-sealing contactor based on the three-phase output current of the permanent magnet synchronous motor includes: When the sealing contactor is closed, the three-phase output current of the permanent magnet synchronous motor is detected; If the effective value of the three-phase output current is greater than the second rated current corresponding to the star-sealing contactor, then the star-sealing contactor is disconnected.

6. The elevator control method according to claim 1, characterized in that, When the elevator is in a normal stopped state, controlling the closing of the sealing contactor includes: After the elevator has been running at zero speed for a preset time, the pulse broadband modulation (PWM) wave transmission to the permanent magnet synchronous motor is turned off. After a preset short delay, the sealing contactor is controlled to close.

7. The elevator control method according to claim 1, characterized in that, The method further includes: detecting the operating status of the elevator based on preset fault detection rules, so as to determine whether the elevator is operating in a normal stopping state or a fault stopping state.

8. An elevator control device, applied to an elevator control system, characterized in that, include: The disconnection unit is used to disconnect the output contactor based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator after the control star contactor is closed when the elevator is running in the normal parking state. The elevator control system is connected to the permanent magnet synchronous motor via the output contactor and the sealing contactor; A closing unit is used to control the output contactor to remain closed when the elevator is in a fault stop state, obtain the star-sealed short-circuit current of the permanent magnet synchronous motor, and close the star-sealed contactor based on the star-sealed short-circuit current; An execution unit is configured to disconnect the sealing contactor based on the three-phase output current of the permanent magnet synchronous motor after the sealing contactor is closed, and to disconnect the output contactor based on the three-phase output current of the permanent magnet synchronous motor or the running speed of the elevator.

9. An elevator control device, characterized in that, include: Central processing unit, memory, input / output interface, wired or wireless network interface, power supply; The memory is either a short-term storage memory or a persistent storage memory; The central processing unit is configured to communicate with the memory and execute instructions in the memory on a control plane functional entity to perform the method described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 1 to 7.

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