Escalator control system and method and storage medium

Abstract

The embodiment of the invention relates to the technical field of elevators, and discloses an escalator control system and method and a storage medium. The escalator control system comprises a main controller, a frequency converter, a frequency conversion contactor and a power frequency contactor; the frequency converter comprises a driving module, a power grid synchronization module and a control module; the first end of the power frequency contactor is connected with the output end of a power grid, and the second end of the power frequency contactor is connected with the escalator motor; the input end of the driving module is connected with the output end of the power grid, the output end of the driving module is connected with the first end of the frequency conversion contactor, and the second end of the frequency conversion contactor is connected with the escalator motor; the main controller is connected with the power grid synchronization module, the control module, the frequency conversion contactor and the power frequency contactor. According to the embodiment of the invention, the jitter of switching the escalator motor from the frequency conversion mode to the power frequency mode is reduced, the user experience is improved, and the service life of the escalator motor is prolonged.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of elevator technology, and in particular to an escalator control system, method and storage medium. Background Art

[0002] At present, the bypass frequency conversion control system of the escalator reduces the speed or stops running when the escalator is not in use, and resumes normal operation when someone is using it. This control method can not only save energy, but also reduce the mechanical wear of the escalator and extend the service life of the escalator.

[0003] The soft start mode is often used in the bypass frequency conversion control system of escalators because of its small impact on the power grid, controllable escalator acceleration time, smooth acceleration, and good passenger comfort. In the soft start mode, when the escalator resumes normal operation after someone uses it, the escalator is accelerated by the inverter. When it accelerates to the power frequency speed, the control system switches to power frequency operation.

[0004] However, the existing soft start mode has the following problems: the escalator frequency conversion has large jitter when switching to the working frequency, which affects the passenger experience and reduces the service life of the motor; the contactor will be disconnected when the escalator frequency conversion is switched to the working frequency, and the frequency conversion contactor contacts will arc severely, which will cause great interference to the control system and easily cause the control system to falsely report faults, affecting the normal operation of the escalator. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide an escalator control system, method and storage medium, thereby reducing the jitter of the escalator motor when switching from variable frequency mode to industrial frequency mode, improving the user experience, and increasing the service life of the escalator motor.

[0006] To solve the above technical problems, an embodiment of the present application provides an escalator control system, comprising: a main controller, a frequency converter, a variable frequency contactor, and an industrial frequency contactor; the frequency converter comprises a drive module, a power grid synchronization module, and a control module; the first end of the industrial frequency contactor is connected to the output end of the power grid, and the second end of the industrial frequency contactor is connected to the escalator motor; the input end of the drive module is connected to the output end of the power grid, the output end of the drive module is connected to the first end of the variable frequency contactor, and the second end of the variable frequency contactor is connected to the escalator motor; the main controller is connected to the power grid synchronization module, the control module, the variable frequency contactor, and the industrial frequency contactor; the power grid synchronization module is configured to synchronize the output voltage phase of the drive module with the industrial frequency voltage phase of the power grid; the main controller is configured to control the control module to turn on and off, and control the conduction and disconnection of the variable frequency contactor and the industrial frequency contactor; the drive module is configured to drive the escalator motor to run when the control module is turned on and the variable frequency contactor is turned on; the power grid is configured to drive the escalator motor to run when the industrial frequency contactor is turned on.

[0007] An embodiment of the present application also provides an escalator control method, which is applied to the main controller in the above-mentioned escalator control system; the method includes: controlling the control module to turn on and controlling the variable frequency contactor to turn on and the industrial frequency contactor to turn off, so that the drive module drives the escalator motor to operate; when receiving the phase synchronization signal, controlling the control module to turn off, the variable frequency contactor to turn off, and the industrial frequency contactor to turn on, so that the power grid drives the escalator motor to operate; wherein, the phase synchronization signal is sent by the power grid synchronization module to the main controller when the speed of the escalator is accelerated to the industrial frequency speed and the output voltage phase of the drive module and the industrial frequency voltage phase of the power grid are within a preset error range.

[0008] An embodiment of the present application further provides a computer-readable storage medium storing a computer program, wherein the computer program implements the above-mentioned escalator control method when executed by a processor.

[0009] In some embodiments, the power grid is a three-phase alternating current, the power grid has three output terminals, and the driving module has three input terminals and three output terminals corresponding to the three input terminals one by one;

[0010] In each phase link of the power grid, each output end of the power grid is connected to the escalator motor through one of the industrial frequency contactors; each output end of the power grid is connected to an input end of the drive module, and each output end of the drive module is connected to the escalator motor through one of the variable frequency contactors.

[0011] In some embodiments, the escalator control system further includes a first direction contactor and a second direction contactor; the main controller is connected to the first direction contactor and the second direction contactor; in each phase link of the power grid, there is a first node between the second end of each of the power frequency contactors and the escalator motor, and the second end of each of the variable frequency contactors is connected to the escalator motor through the first node; the first direction contactor is arranged between the first node and the escalator motor; there is a second node between the first direction contactor and the escalator motor, and there is a third node between the second end of the variable frequency contactor and the first node; in the first phase link, the first end of the second direction contactor is connected to the third node in the first phase link, and the second end of the second direction contactor is connected to the second node in the third phase link; in the second phase link, the first end of the second direction contactor is connected to the third node in the second phase link, and the second end of the second direction contactor is connected to the second node in the second phase link; in the third phase link, the first end of the second direction contactor is connected to the third node in the third phase link, and the second end of the second direction contactor is connected to the second node in the first phase link; wherein the conduction states of the first direction contactor and the second direction contactor are opposite.

[0012] In some embodiments, the escalator control system also includes a detection device, and the main controller is connected to the detection device; the detection device is configured to send a target signal of a user entering the escalator to the main controller when the user enters the escalator; the main controller is configured to control the control module to turn on, and control the variable frequency contactor to turn on and the industrial frequency contactor to turn off when receiving the target signal sent by the detection device; the power grid synchronization module is also configured to send a phase synchronization signal to the main controller when the speed of the escalator is accelerated to the industrial frequency speed and the output voltage phase of the drive module and the industrial frequency voltage phase of the power grid are within a preset error range; the main controller is also configured to control the control module to turn off when receiving the phase synchronization signal, and control the variable frequency contactor to turn off and the industrial frequency contactor to turn on after a preset delay T.

[0013] In some embodiments, the preset time delay T is greater than or equal to a filtering period of the frequency converter.

[0014] The technical solution provided by the embodiments of the present application has at least the following advantages:

[0015] The escalator control system of this embodiment sets a power grid synchronization module in the frequency converter. When the drive module of the frequency converter drives the escalator electrode to operate, the power grid synchronization module synchronizes the output voltage phase of the drive module with the power frequency voltage phase of the power grid. Therefore, the main controller can switch the escalator motor from the variable frequency mode to the power frequency mode according to the signal fed back by the power grid synchronization module when the output voltage phase of the drive module is synchronized with the power frequency voltage of the power grid. This solves the problem in the related art that the escalator motor is subjected to a large impact and generates a large jitter when switching to the power frequency mode due to the large synchronization difference between the output voltage phase of the drive module and the power frequency voltage of the power grid. This reduces the jitter of the escalator motor when switching from the variable frequency mode to the power frequency mode, improves the user experience, and increases the service life of the escalator motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 is a circuit structure diagram of an escalator control system according to an embodiment of the present application;

[0018] Figure 2 is a circuit structure diagram of an escalator control system according to an embodiment of the present application;

[0019] Figure 3 is a control timing diagram of an escalator control system according to an embodiment of the present application;

[0020] Figure 4 is a speed curve diagram of an escalator according to an embodiment of the present application;

[0021] Figure 5 It is a flowchart of an escalator control method according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and the specific implementation of the present application should not be construed as any limitation, and the various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0023] In the description of the embodiments of the present application, "at least one" means one or more, "multiple" means two or more, and "at least one group" means one or more groups, unless otherwise clearly and specifically defined.

[0024] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] In the description of the embodiments of the present application, when a certain component “includes” another component, unless otherwise stated, other components are not excluded and other components may be further included.

[0027] An embodiment of the present application relates to an escalator control system, and a specific circuit structure diagram is shown in FIG. Figure 1 As shown, the escalator control system includes: a main controller (not shown), a frequency converter 10, a variable frequency contactor S1, and an industrial frequency contactor S2; the frequency converter 10 includes a drive module 101, a power grid synchronization module 102, and a control module 103.

[0028] Specifically, the first end of the power frequency contactor S2 is connected to the output end of the power grid AC, and the second end of the power frequency contactor S2 is connected to the escalator motor M; the input end of the drive module 101 is connected to the output end of the power grid AC, the output end of the drive module 101 is connected to the first end of the variable frequency contactor S1, and the second end of the variable frequency contactor S1 is connected to the escalator motor M; the main controller is connected to the power grid synchronization module 102, the control module 103, the variable frequency contactor S1, and the power frequency contactor S2.

[0029] Specifically, the grid synchronization module 102 is configured to synchronize the output voltage phase of the drive module 101 with the industrial frequency voltage phase of the grid AC; the main controller is configured to control the opening and closing of the control module 103, and control the conduction and disconnection of the variable frequency contactor S1 and the industrial frequency contactor S2; the drive module 101 is configured to drive the escalator motor M to operate when the control module 103 is turned on and the variable frequency contactor S1 is turned on; the grid AC is configured to drive the escalator motor M to operate when the industrial frequency contactor S2 is turned on.

[0030] Specifically, when the main controller controls the control module 103 to turn on, the variable frequency contactor S1 is turned on, and the industrial frequency contactor S2 is turned off, the escalator motor M is in the variable frequency mode; when the main controller controls the control module 103 to turn off, the variable frequency contactor S1 is turned off, and the industrial frequency contactor S2 is turned on, the escalator motor M is in the industrial frequency mode.

[0031] The escalator control system of this embodiment sets a power grid synchronization module 102 in the inverter 10. When the drive module of the inverter 10 drives the escalator electrode to operate, the power grid synchronization module 102 synchronizes the output voltage phase of the drive module with the industrial frequency voltage phase of the power grid AC. Therefore, the main controller can switch the escalator motor from the variable frequency mode to the industrial frequency mode according to the signal fed back by the power grid synchronization module 102 when the output voltage phase of the drive module is synchronized with the industrial frequency voltage of the power grid AC. This solves the problem in the related art that the escalator motor is subjected to a large impact and generates a large jitter when switching to the industrial frequency mode due to the large synchronization difference between the output voltage phase of the drive module and the industrial frequency voltage of the power grid AC, thereby reducing the jitter of the escalator motor when switching from the variable frequency mode to the industrial frequency mode, improving the user experience, and increasing the service life of the escalator motor.

[0032] Specifically, the main controller includes: Figure 1 The main controller also includes a receiving end, namely receiving A. Figure 1 The multiple control terminals shown, namely control B, control C, and control D, the main controller receives the phase synchronization signal of the power grid synchronization module 102 through the receiving port A, the main control module controls the opening and closing of the control module 103 through control B, controls the on and off of the power frequency contactor S2 through control C, and controls the on and off of the variable frequency contactor S1 through control D.

[0033] In actual application, the main controller first turns on the control module 103 by controlling B, controls the variable frequency contactor S1 to be turned on by controlling D, and turns off the power frequency contactor S2 by controlling C, so that the control module 103 controls the drive module 101 to work, and the drive module 101 drives the escalator motor M to run, so that the escalator motor M is in the variable frequency mode, and the speed of the escalator increases uniformly; at this time, the power grid synchronization module 102 synchronizes the output voltage phase of the drive module 101 with the power frequency voltage phase of the power grid AC; afterwards, when the speed of the escalator gradually accelerates to the power frequency speed and the output voltage phase of the drive module is synchronized with the power frequency voltage phase of the power grid AC When the industrial frequency voltage phase is within a preset error range, the escalator motor is switched from the variable frequency mode to the industrial frequency mode. Therefore, when the escalator speed is accelerated to the industrial frequency speed and the output voltage phase of the drive module 101 and the industrial frequency voltage phase of the power grid AC are within a preset error range, the grid synchronization module 102 sends a phase synchronization signal to the main controller. When the main controller receives the phase synchronization signal, it switches the escalator motor M from the variable frequency mode to the industrial frequency mode, that is, the main controller controls the control module 103 to be turned off, the variable frequency contactor S1 to be turned off, and the industrial frequency contactor S2 to be turned on, so that the power grid AC drives the escalator motor M to operate.

[0034] Specifically, the preset error range between the phase of the output voltage of the driving module and the phase of the power frequency voltage of the power grid AC is set according to actual needs. For example, the preset error range is within the range of 0 to 3.6°.

[0035] Specifically, the power grid AC is a three-phase alternating current, the power grid AC has three output terminals, and the driving module 101 has three input terminals and three output terminals corresponding to the three input terminals one by one; in each phase link of the power grid AC, each output terminal of the power grid AC is connected to the escalator motor M through an industrial frequency contactor S2; each output terminal of the power grid AC is connected to an input terminal of the driving module 101, and each output terminal of the driving module 101 is connected to the escalator motor M through a variable frequency contactor S1.

[0036] In one embodiment, Figure 2 As shown, it is a schematic diagram of the circuit structure of the escalator control system of this embodiment. The escalator control system also includes a first direction contactor S3 and a second direction contactor S4; the main controller is connected to the first direction contactor S3 and the second direction contactor S4.

[0037] Specifically, in each phase link of the power grid AC, there is a first node a between the second end of each industrial frequency contactor S2 and the escalator motor M, and the second end of each variable frequency contactor S1 is connected to the escalator motor M through the first node a; the first direction contactor S3 is arranged between the first node a and the escalator motor M; there is a second node b between the first direction contactor S3 and the escalator motor M, and there is a third node c between the second end of the variable frequency contactor S1 and the first node a.

[0038] Specifically, in the first phase link, the first end of the second direction contactor S4 is connected to the third node c in the first phase link, and the second end of the second direction contactor S4 is connected to the second node b in the third phase link; in the second phase link, the first end of the second direction contactor S4 is connected to the third node c in the second phase link, and the second end of the second direction contactor S4 is connected to the second node b in the second phase link; in the third phase link, the first end of the second direction contactor S4 is connected to the third node c in the third phase link, and the second end of the second direction contactor S4 is connected to the second node b in the first phase link.

[0039] Specifically, the control end of the main controller also includes control E and control F. The main controller controls the on and off of the first direction contactor S3 through control E, and the main controller controls the on and off of the second direction contactor S4 through control F; wherein the on states of the first direction contactor S3 and the second direction contactor S4 are opposite.

[0040] In this embodiment, by setting the first direction contactor S3 and the second direction contactor S4 with opposite conduction states, the first direction contactor S3 or the second direction contactor S4 can be selected to be turned on according to the running direction of the escalator motor M. Even if a phase connection error occurs in the escalator motor M during the connection process, the first direction contactor S3 or the second direction contactor S4 can be selected to be turned on according to the actual connection relationship of the escalator motor M, which can improve the fault tolerance of the escalator control system.

[0041] In actual application, the main controller first turns on the control module 103 through control B, controls the frequency conversion contactor S1 to be turned on through control D, controls the power frequency contactor S2 to be turned off through control C, and controls the first direction contactor S3 to be turned on through control E or controls the second direction contactor S4 to be turned on through control F, so that the control module 103 controls the drive module 101 to work, and the drive module 101 drives the escalator motor M to run, so that the escalator motor M is in the frequency conversion mode; thereafter, the speed of the escalator gradually accelerates to the power frequency speed, and at the same time, the power grid synchronization module 102 synchronizes the output voltage phase of the drive module 101 with the power frequency voltage phase of the power grid AC. When the speed of the escalator gradually accelerates to the power frequency speed and the drive module 101 outputs the power When the voltage phase of the driving module 101 and the industrial frequency voltage phase of the power grid AC are within a preset error range, the escalator motor is switched from the variable frequency mode to the industrial frequency mode. Therefore, when the escalator speed is accelerated to the industrial frequency speed and the output voltage phase of the driving module 101 and the industrial frequency voltage phase of the power grid AC are within a preset error range, the power grid synchronization module 102 sends a phase synchronization signal to the main controller. When the main controller receives the phase synchronization signal, it switches the escalator motor M from the variable frequency mode to the industrial frequency mode, that is, the main controller controls the control module 103 to be turned off, the variable frequency contactor S1 to be turned off, and the industrial frequency contactor S2 to be turned on. At this time, the conduction state of the first direction contactor S3 or the second direction contactor S4 does not need to be switched, so that the power grid AC drives the escalator motor M to run.

[0042] Specifically, when the user has not entered the escalator, the escalator control system is in a stopped state, that is, the main controller turns off the control module 103 through control B, thereby turning off the frequency converter 10, and controls the frequency conversion contactor S1 to be turned off through control D, controls the industrial frequency contactor S2 to be turned off through control C, and controls the first direction contactor S3 to be turned on through control E or controls the second direction contactor S4 to be turned on through control F. In order to enable the escalator control system to automatically sense whether a user enters the escalator, the escalator control system also includes a detection device (not shown in the figure), and the main controller is connected to the detection device; the detection device is configured to send a target signal of the user entering the escalator to the main controller when the user enters the escalator; the main controller is configured to control the control module 103 to turn on, and control the variable frequency contactor S1 to turn on, and the industrial frequency contactor S2 to turn off when receiving the target signal sent by the detection device; the power grid synchronization module 102 is also configured to send a phase synchronization signal to the main controller when the speed of the escalator is accelerated to the industrial frequency speed and the output voltage phase of the drive module 101 and the industrial frequency voltage phase of the power grid AC are within a preset error range; the main controller is also configured to control the control module 103 to turn off when receiving the phase synchronization signal, and control the variable frequency contactor S1 to turn off and the industrial frequency contactor S2 to turn on after a preset delay T.

[0043] Specifically, after the main control module turns on the control module 103 and controls the variable frequency contactor S1 to turn on and the industrial frequency contactor S2 to turn off, it also includes: if the target signal of other users entering the escalator sent by the detection device is not received within the preset time interval t, after the preset time interval t, the control module 103 is controlled to be turned off, the variable frequency contactor S1 is turned off, and the industrial frequency contactor S2 is turned off.

[0044] Specifically, the detection device is a sensor, which is arranged at the entrance of the escalator. The detection device is used to send a target signal of a user entering the escalator to the main controller, and the main controller can determine that the user has entered the escalator when receiving the target signal. In actual application, when the sensor detects that a user has entered the escalator, the corresponding target signal is transmitted to the main controller, and the main controller can determine that the user has entered the escalator according to the target signal. The main controller thus controls the control module 103 to turn on, and controls the frequency conversion contactor S1 to turn on and the power frequency contactor S2 to turn off, and then executes the step of switching the escalator motor M from the frequency conversion mode to the power frequency mode; at the same time, the main controller starts timing when receiving the target signal. If the detection device does not send a target signal of other users entering the escalator after a preset time interval t, it means that the current user has finished using it after the preset time interval t, and the main control module controls to turn off the control module 103 through control B, thereby turning off the frequency converter 10, and controlling the frequency conversion contactor S1 to turn off and the power frequency contactor S2 to turn off. If the sensor continues to send a target signal indicating that other users have entered the escalator within the preset time interval t, the timing is restarted with the new target signal as the starting time, and it is continued to be determined whether the preset time interval t has passed.

[0045] Specifically, the preset time interval t can be calculated based on the time t taken by the escalator to move the user from the escalator entrance to the escalator exit. a Determine that the user is in a non-moving state in the escalator, that is, the user is in a stationary state relative to the escalator. The preset time interval t can be slightly greater than the time t a , for example, than time t a 1 second, 2 seconds, 3 seconds, etc., to provide users with enough time to ride the escalator, improve their riding experience, and avoid the problem of waste of resources caused by continuous operation of the escalator.

[0046] Specifically, when the escalator motor M needs to be converted from the variable frequency mode to the industrial frequency mode, if the main control module simultaneously turns off the control module 103 and the variable frequency contactor S1, since the frequency converter 10 itself needs to be filtered after being turned off, it has a certain filtering period. If the variable frequency contactor S1 is turned off during the filtering period, the variable frequency contactor S1 will be disconnected with current when it is turned off, causing arcing of the contacts of the variable frequency contactor S1, and the life of the variable frequency contactor S1 is reduced. In addition, the arcing of the variable frequency contactor S1 interferes with the entire escalator control system, which easily causes the escalator control system to falsely report a fault, affecting the normal operation of the automatic escalator. Therefore, in this embodiment, when the main controller receives the phase synchronization signal sent by the power grid synchronization module 102, the control module 103 is first controlled to be turned off, and the variable frequency contactor S1 is controlled to be turned off and the industrial frequency contactor S2 is turned on at a preset delay T, so that when the variable frequency contactor S1 is disconnected, there is zero current disconnection and no arcing effect, thereby improving the service life of the variable frequency contactor S1 and improving the anti-interference ability of the escalator control system.

[0047] Specifically, the preset delay T is greater than or equal to the filtering period of the frequency converter 10. Since the frequency converter 10 needs to filter itself after being turned off, it has a certain filtering period. During the filtering period, there will still be some current in the frequency converter contactor S1. After the filtering period ends, there is no current in the frequency converter contactor S1. At this time, the frequency converter contactor S1 is turned off and the power frequency contactor S2 is turned on, which increases the service life of the frequency converter contactor S1 and improves the anti-interference ability of the escalator control system. The filtering period of the frequency converter 10 is generally set in the parameters of the frequency converter 10. For example, the filtering period of the frequency converter 10 can be 5ms, 10ms, etc.; in order to take into account the switching efficiency and achieve no arcing effect, the preset delay T is slightly greater than the filtering period, for example, the preset delay T is greater than 10% or 20% of the filtering period. For example, if the filtering period is 5ms, the preset delay T can be 6ms or 5.5ms; if the filtering period is 10ms, the preset delay T can be 9ms or 8ms;

[0048] Specifically, after the main controller controls the control module 103 to be turned off, the speed of the escalator motor M hardly decreases due to the flywheel inertia and the inertia of the escalator itself. Even if the switch is made after the delay time T, the variable frequency contactor S1 will be controlled to be turned off and the industrial frequency contactor S2 will be turned on. During the whole process, the speed of the escalator hardly decreases, and the switching is not affected. The user basically cannot perceive the change in the escalator speed, which takes into account the user's escalator experience.

[0049] Figure 3As shown, it is a control timing diagram of the escalator control system of this embodiment; in the figure, A represents the situation where the receiving A of the main controller receives the phase synchronization signal sent by the power grid synchronization module 102, the low level indicates that the receiving A does not receive the phase synchronization signal, and the high level indicates that the receiving A receives the phase synchronization signal; in the figure, B represents the situation where the control B of the main controller sends a control signal to the control module 103, the low level indicates that the main controller turns off the control module 103 by controlling B, and the high level indicates that the main controller turns on the control module 103 by controlling B; in the figure, C represents the situation where the control C of the main controller sends a control signal to the power frequency contactor S2, the low level indicates that the main controller turns off the power frequency contactor S2 by controlling C, and the high level indicates that the main controller turns on the power frequency contactor S2 by controlling C turns on the industrial frequency contactor S2; in the figure, D represents the situation where the control D of the main controller sends a control signal to the variable frequency contactor S1, and a low level indicates that the main controller turns off the variable frequency contactor S1 by controlling D, and a high level indicates that the main controller turns on the variable frequency contactor S1 by controlling D; in the figure, E / F represents the situation where the control E or control F of the main controller sends a control signal to the first direction contactor or the second direction contactor, and a low level indicates that the main controller turns off the first direction contactor S3 by controlling E, and a high level indicates that the main controller turns on the first direction contactor S3 by controlling E; or, a low level indicates that the main controller turns off the second direction contactor S4 by controlling F, and a high level indicates that the main controller turns on the second direction contactor S4 by controlling F.

[0050] from Figure 3 It can be seen from the figure that the signals of receiving A, controlling B, controlling C, controlling D and controlling E / F of the main control module change during the whole process from complete stop, variable frequency mode and industrial frequency mode of the escalator control system; before t1, the escalator control system stops completely, and receiving A, controlling B, controlling C, controlling D and controlling E / F are at a low level; at t1, controlling B, controlling D and controlling E / F are switched to a high level, and receiving A and controlling C are still at a low level, that is, the main controller does not receive the phase synchronization signal through receiving A at this time, and the main controller turns on the control module 103 through controlling B, controls the variable frequency contactor S1 to be turned on through controlling D, controls the industrial frequency contactor S2 to be turned off through controlling C, and controls the first direction contactor S3 or the second direction contactor S4 to be turned on through controlling E / F.

[0051] At t2, receiving A switches to a high level, controlling B switches to a low level, controlling C remains at a low level, controlling D remains at a high level, and controlling E / F remains at a high level. That is, at this time, the main controller receives the phase synchronization signal by receiving A, and the main controller turns off the control module 103 by controlling B, controls the variable frequency contactor S1 to turn on by controlling D, controls the industrial frequency contactor S2 to turn off by controlling C, and controls the first direction contactor S3 and the second direction contactor S4 to turn on by controlling E / F. At this time, only the control module 103 is turned off.

[0052] After t2, after a preset time delay T, that is, at t3, receiving A is high, control B is still low, control C is switched to high, control D is switched to low, and control E / F is still at a high level, that is, at this time, the main controller receives the phase synchronization signal through receiving A, the main controller turns off the control module 103 through control B, controls the variable frequency contactor S1 to turn off through control D, controls the power frequency contactor S2 to turn on through control C, and controls the first direction contactor S3 or the second direction contactor S4 to turn on through control E / F. At this time, only the main controller turns off the variable frequency contactor S1 and turns on the power frequency contactor S2 after the preset time delay T of turning off the control module 103. After t3, the states of receiving A, controlling B, controlling C, controlling D, and controlling E / F remain unchanged, and the escalator motor M is completely switched to the power frequency mode, and the escalator motor M runs at a uniform speed according to the power frequency speed.

[0053] like Figure 4 As shown, it is a speed curve diagram of the escalator of this embodiment, wherein Figure 4 The time t1, t2, t3, and T in Figure 3 The times t1, t2, t3, and T are the same. In the figure, B represents the situation where the control B of the main controller sends a control signal to the control module 103. The low level indicates that the main controller turns off the control module 103 through the control B, and the high level indicates that the main controller turns on the control module 103 through the control B.

[0054] from Figure 4It can be seen that before t1, the escalator is in a stopped state with a speed of 0. At t1, control B is switched to a high level, and the main controller turns on the control module 103 through control B. Therefore, in the stage from t1 to t2, starting from t1, the escalator begins to uniformly accelerate to the power frequency speed V, and then maintains the power frequency speed V for a period of time until t2. At t2, the main controller receives the phase synchronization signal, and control B is switched to a low level. The main controller turns off the control module 103 through control B, but does not turn off the variable frequency contactor S1 within the preset delay T, nor does it turn on the power frequency contactor S2. Since the escalator motor M has the flywheel inertia and the inertia of the escalator itself, the escalator speed has almost no decrease, and has no effect on the switching; after t2, after the preset delay T, that is, at t3, the variable frequency contactor S1 is turned off, the power frequency contactor S2 is turned on, the escalator motor M is completely switched to the power frequency mode, and the escalator motor M runs at a uniform speed according to the power frequency speed V.

[0055] The division of various components above is only for clear description. When implemented, they can be combined into one component or some components can be split and decomposed into multiple components. As long as they include the same logical relationship, they are all within the protection scope of this application.

[0056] An embodiment of the present application relates to an escalator control method, which is applied to a main controller in the escalator control system of the previous embodiment; Figure 5 FIG. 1 is a flow chart of the escalator control method of this embodiment. The escalator control method of this embodiment includes the following steps:

[0057] Step 201, the control module is turned on and controls the variable frequency contactor to be turned on and the industrial frequency contactor to be turned off, so that the drive module drives the escalator motor to operate.

[0058] Step 202, when a phase synchronization signal is received, the control module is turned off, the variable frequency contactor is turned off, and the industrial frequency contactor is turned on, so that the power grid drives the escalator motor to operate.

[0059] The phase synchronization signal is sent by the grid synchronization module to the main controller when the escalator speed is accelerated to the power frequency speed and the output voltage phase of the drive module and the power frequency voltage phase of the grid are within a preset error range.

[0060] Specifically, when the phase synchronization signal is received, the control module is controlled to be closed, the variable frequency contactor is turned off, and the industrial frequency contactor is turned on, including: when the phase synchronization signal is received, the control module is controlled to be closed; and after a preset delay T after the control module is closed, the variable frequency contactor is controlled to be turned off and the industrial frequency contactor is turned on.

[0061] Specifically, the escalator control system also includes a detection device, and the main controller is connected to the detection device; the detection device is configured to send a target signal of a user entering the escalator to the main controller when the user enters the escalator; before the control module turns on and controls the frequency conversion contactor to be turned on, it also includes: when receiving the target signal sent by the detection device, executing the control module to turn on and control the frequency conversion contactor to be turned on and the industrial frequency contactor to be turned off.

[0062] Specifically, after the main control module turns on the control module and controls the frequency conversion contactor to turn on and the industrial frequency contactor to turn off, it also includes: if the target signal of other users entering the escalator sent by the detection device is not received within the preset time interval t, then after the preset time interval t, the control module is turned off, the frequency conversion contactor is turned off, and the industrial frequency contactor is turned off.

[0063] It is not difficult to find that this embodiment is a method embodiment corresponding to the system embodiment, and this embodiment can be implemented in conjunction with the system embodiment. The relevant technical details mentioned in the system embodiment are still valid in this embodiment, and in order to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied in the system embodiment.

[0064] An embodiment of the present application relates to a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the above method embodiment is implemented.

[0065] That is, those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0066] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. An escalator control system, characterized in that: include: Main controller, frequency converter, frequency conversion contactor, power frequency contactor; the frequency converter includes a drive module, a power grid synchronization module, and a control module; The first end of the power frequency contactor is connected to the output end of the power grid, and the second end of the power frequency contactor is connected to the escalator motor; the input end of the drive module is connected to the output end of the power grid, the output end of the drive module is connected to the first end of the variable frequency contactor, and the second end of the variable frequency contactor is connected to the escalator motor; The main controller is connected to the power grid synchronization module, the control module, the variable frequency contactor, and the power frequency contactor; The power grid synchronization module is configured to synchronize the output voltage phase of the drive module with the power frequency voltage phase of the power grid; The main controller is configured to control the control module to be turned on and off, and to control the conduction and disconnection of the variable frequency contactor and the power frequency contactor; The driving module is configured to drive the escalator motor to operate when the control module is turned on and the variable frequency contactor is turned on; the power grid is configured to drive the escalator motor to operate when the power frequency contactor is turned on.

2. The escalator control system according to claim 1, characterized in that: The power grid is a three-phase alternating current, the power grid has three output terminals, and the driving module has three input terminals and three output terminals corresponding to the three input terminals one by one; In each phase link of the power grid, each output end of the power grid is connected to the escalator motor through one of the industrial frequency contactors; each output end of the power grid is connected to an input end of the drive module, and each output end of the drive module is connected to the escalator motor through one of the variable frequency contactors.

3. The escalator control system according to claim 2, characterized in that: The escalator control system further includes a first direction contactor and a second direction contactor; the main controller is connected to the first direction contactor and the second direction contactor; In each phase link of the power grid, there is a first node between the second end of each of the power frequency contactors and the escalator motor, and the second end of each of the variable frequency contactors is connected to the escalator motor through the first node; The first direction contactor is arranged between the first node and the escalator motor; There is a second node between the first direction contactor and the escalator motor, and there is a third node between the second end of the variable frequency contactor and the first node; In the first phase link, the first end of the second direction contactor is connected to the third node in the first phase link, and the second end of the second direction contactor is connected to the second node in the third phase link; In the second phase link, the first end of the second direction contactor is connected to the third node in the second phase link, and the second end of the second direction contactor is connected to the second node in the second phase link; In the third phase link, the first end of the second direction contactor is connected to the third node in the third phase link, and the second end of the second direction contactor is connected to the second node in the first phase link; The conduction states of the first direction contactor and the second direction contactor are opposite.

4. The escalator control system according to claim 1, characterized in that: The escalator control system further comprises a detection device, the main controller is connected to the detection device; the detection device is configured to send a target signal of a user entering the escalator to the main controller when a user enters the escalator; The main controller is configured to control the control module to start, and control the variable frequency contactor to turn on and the power frequency contactor to turn off when receiving the target signal sent by the detection device; The power grid synchronization module is further configured to send a phase synchronization signal to the main controller when the speed of the escalator is accelerated to the power frequency speed and the output voltage phase of the drive module and the power frequency voltage phase of the power grid are within a preset error range; The main controller is also configured to control the control module to be turned off when receiving the phase synchronization signal, and control the variable frequency contactor to be turned off and the industrial frequency contactor to be turned on after a preset delay T.

5. The escalator control system according to claim 4, characterized in that: The preset time delay T is greater than or equal to the filtering period of the frequency converter.

6. An escalator control method, characterized in that: A main controller applied to the escalator control system according to claim 1; the method comprising: Control the control module to turn on and control the variable frequency contactor to turn on and the power frequency contactor to turn off, so that the drive module drives the escalator motor to operate; When the phase synchronization signal is received, the control module is controlled to be closed, the variable frequency contactor is turned off, and the industrial frequency contactor is turned on, so that the power grid drives the escalator motor to operate; wherein, the phase synchronization signal is sent by the power grid synchronization module to the main controller when the speed of the escalator is accelerated to the industrial frequency speed and the output voltage phase of the drive module and the industrial frequency voltage phase of the power grid are within a preset error range.

7. The escalator control method according to claim 6, characterized in that: When the phase synchronization signal is received, controlling the control module to be turned off, the variable frequency contactor to be turned off, and the power frequency contactor to be turned on includes: When the phase synchronization signal is received, controlling the control module to shut down; And after a preset time delay T after the control module is turned off, the variable frequency contactor is controlled to be turned off and the industrial frequency contactor is controlled to be turned on.

8. The escalator control method according to claim 6 or 7, characterized in that: The escalator control system further comprises a detection device, the main controller is connected to the detection device; the detection device is configured to send a target signal of a user entering the escalator to the main controller when a user enters the escalator; Before controlling the control module to start and controlling the variable frequency contactor to conduct, the method further includes: In case of receiving the target signal sent by the detection device, the steps of controlling the control module to start and controlling the variable frequency contactor to turn on and the power frequency contactor to turn off are performed.

9. The escalator control method according to claim 8, characterized in that: After the control module is controlled to start and control the variable frequency contactor to be turned on and the power frequency contactor to be turned off, the method further includes: If the target signal of other users entering the escalator sent by the detection device is not received within the preset time interval t, then after the preset time interval t, the control module is controlled to be turned off, the variable frequency contactor is turned off, and the power frequency contactor is turned off.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the escalator control method according to any one of claims 6 to 9 is implemented.

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