Escalator control and driving system powered by direct current

Abstract

The invention discloses a direct-current power supply escalator control and driving system which is applied to an escalator comprising a motor and comprises a control module and a driving module. The input end of the driving module is connected with the output end of the control module and a direct-current power grid; the output end of the driving module is connected with the input end of the control module and the motor; the input end of the control module is connected with a direct-current power grid; the driving module comprises two driving units which are redundant to each other. The power supply mode of the control module and the driving module is converted from alternating current power supply to direct current power supply, so that the reliability, feasibility, safety and energy-saving effect of operation of the escalator can be ensured; the two driving units which are redundant to each other are adopted to drive the motor to operate, so that when one driving unit breaks down, the other driving unit can drive the motor, and then normal operation of the escalator is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current (DC) power supply input, and in particular to a DC-powered escalator control and drive system. Background Art

[0002] The existing terminal energy-consuming equipment of urban rail transit is all in AC power distribution mode. The escalator control and drive system is designed under AC 380V or AC220V power distribution. The motor of the escalator drive system is generally a full-frequency drive three-phase asynchronous motor. Under the external AC380V input condition, the inverter mainly converts the AC (alternating current) input into the intermediate link DC (direct current) through the inverter, and then drives the three-phase asynchronous motor through the frequency conversion output AC (alternating current) and realizes the speed regulation function; when the inverter fails, in order to ensure the normal operation of the escalator in the subway station, the equipment must have the function of switching to the industrial frequency AC380V to start the motor to maintain the operation of the escalator. The existing escalator control system can invert the AC (alternating current) input into DC (direct current) power of different voltage levels for use by various control components.

[0003] The escalator power supply solution and power quality are the key factors affecting the smooth operation of the equipment. In order to adapt to the new DC power distribution mode, the escalator power input solution is changed from the original AC grid solution to the DC grid solution. The escalator control and drive system solution urgently needs to be redeveloped to ensure the reliability, feasibility, safety and energy saving of the escalator operation. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a DC-powered escalator control and drive system, in which the power input scheme of the escalator is a DC power input, which can ensure the reliability, feasibility, safety and energy-saving effect of the escalator operation.

[0005] In order to solve the above problems, the present invention is implemented according to the following scheme:

[0006] Provided is a DC powered escalator control and drive system, which is applied to an escalator including a motor, and includes: a control module and a drive module;

[0007] The input end of the driving module is connected to the output end of the control module and the DC power grid; the output end of the driving module is connected to the input end of the control module and the motor; the input end of the control module is connected to the DC power grid;

[0008] The driving module includes two driving units which are redundant to each other.

[0009] Compared with the prior art, the beneficial effects of a DC-powered escalator control and drive system of the present invention are as follows: by converting the power supply mode of the control module and the drive module from AC power supply to DC power supply, the reliability, feasibility, safety and energy-saving effect of the escalator operation can be ensured; and two redundant drive units are used to drive the motor to operate, so that when one drive unit fails, the motor can be driven by the other drive unit, thereby ensuring the normal operation of the escalator.

[0010] Optionally, the driving module includes a main driving unit and a backup driving unit that are redundant with each other;

[0011] The input end of the main drive unit is connected to the DC power grid and the output end of the control module, and the output end of the main drive unit is connected to the input end of the control module and the motor;

[0012] The input end of the standby drive unit is connected to the DC power grid and the output end of the control module, and the output end of the standby drive unit is connected to the input end of the control module and the motor.

[0013] Optionally, when the motor is an AC motor, and the main drive unit and the standby drive unit have the same structure, the main drive unit includes a main frequency converter and a main contactor, and the standby drive unit includes a standby frequency converter and a standby contactor;

[0014] The output end of the control module is connected to the input end of the main frequency converter and the main contactor, the input end of the control module is connected to the output end of the main frequency converter, and the main contactor is connected to the AC motor;

[0015] The output end of the control module is connected to the input end of the standby frequency converter and the standby contactor, the input end of the control module is connected to the output end of the standby frequency converter, and the standby contactor is connected to the AC motor.

[0016] Optionally, the control module is used to:

[0017] Receiving a fault signal and an operating frequency of the main frequency converter or the standby frequency converter;

[0018] Controlling the opening and closing state of the main contactor or the standby contactor according to the fault signal and the operating frequency;

[0019] When the main contactor is in a closed state and the standby contactor is in an open state, the control module controls the main inverter to drive the motor with preset parameters;

[0020] When the main contactor is in an open state and the standby contactor is in a closed state, the control module controls the standby inverter to drive the motor with preset parameters.

[0021] Optionally, when the motor is an AC motor, and the main drive unit and the standby drive unit have different structures, the main drive unit includes a main frequency converter and a main contactor, and the standby drive unit includes a standby starting module and a standby contactor;

[0022] The output end of the control module is connected to the input end of the main frequency converter and the main contactor, the input end of the control module is connected to the output end of the main frequency converter, and the main contactor is connected to the AC motor;

[0023] The output end of the control module is connected to the input end of the standby starting module and the standby contactor, the input end of the control module is connected to the output end of the standby starting module, and the standby contactor is connected to the AC motor.

[0024] Optionally, the control module is used to:

[0025] Receiving a fault signal and an operating frequency of the main frequency converter or the standby starting module;

[0026] Controlling the opening and closing state of the main contactor or the standby contactor according to the fault signal and the operating frequency;

[0027] When the main contactor is in a closed state and the standby contactor is in an open state, the control module controls the main inverter to drive the motor with preset parameters;

[0028] When the main contactor is in an open state and the standby contactor is in a closed state, the control module controls the standby starting module to drive the motor with preset parameters.

[0029] Optionally, when the motor is a DC motor, the main drive unit includes a main speed regulator and a main contactor, and the standby drive unit includes a standby speed regulator and a standby contactor;

[0030] The output end of the control module is connected to the input end of the main speed regulator and the main contactor, the input end of the control module is connected to the output end of the main speed regulator, and the main contactor is connected to the DC motor;

[0031] The output end of the control module is connected to the input end of the standby speed regulator and the standby contactor, the input end of the control module is connected to the output end of the standby speed regulator, and the standby contactor is connected to the DC motor.

[0032] Optionally, the control module is used to:

[0033] Receiving a fault signal and an operating frequency of the main speed regulator or the standby speed regulator;

[0034] Controlling the opening and closing state of the main contactor or the standby contactor according to the fault signal and the operating frequency;

[0035] When the main contactor is in a closed state and the standby contactor is in an open state, the control module controls the main speed regulator to drive the motor with preset parameters;

[0036] When the main contactor is in an open state and the standby contactor is in a closed state, the control module controls the standby speed regulator to drive the motor with preset parameters.

[0037] Optionally, the DC grid is connected to an output terminal of the driving module;

[0038] The driving module receives a feedback signal from the motor and sends the feedback signal to the control module; the control module generates a state conversion signal according to the feedback signal and sends the state conversion signal to the driving module;

[0039] The driving module receives the electric energy fed back by the motor according to the state conversion signal, converts the electric energy into direct current electric energy, and sends the direct current electric energy to the direct current grid.

[0040] Optionally, the control module includes a transformer unit, an input end of which is connected to the DC power grid; the transformer unit is used to convert the DC power grid into multiple DC voltage power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is an overall schematic diagram of the first embodiment;

[0042] Figure 2 It is a partial schematic diagram of Embodiment 1;

[0043] Figure 3 It is a partial schematic diagram of the second embodiment;

[0044] Figure 4 It is a partial schematic diagram of Example 3.

[0045] Explanation of the accompanying drawings: 1. DC power grid; 2. Control module; 3. Drive module; 4. Motor. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0047] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0048] Embodiment 1

[0049] See also Figure 2 As shown, this embodiment discloses a DC-powered escalator control and drive system, which is applied to an escalator including a motor 4. The motor 4 is a driving device of the escalator, responsible for converting electrical energy into mechanical energy to drive the step chain or belt of the escalator to move, thereby realizing the up and down movement of the escalator.

[0050] The escalator control and drive system includes: a control module 2 and a drive module 3; the input end of the drive module 3 is connected to the output end of the control module 2; the output end of the drive module 3 is connected to the input end of the control module 2 and the motor 4; the DC power grid 1 is connected to the input end of the control module 2 and the input end of the drive module 3.

[0051] When an AC power grid is traditionally used to drive an AC motor, its driving module converts electric energy into AC-DC-AC to drive the AC motor through AC. When the driving module fails, the AC power grid can be directly connected to the AC motor, that is, the AC power grid can directly supply power to the AC motor without going through the driving module. However, the present embodiment uses a DC power grid to drive the AC motor, and the driving module converts electric energy into DC-AC to drive the AC motor through AC. When the driving module fails, the DC power grid cannot directly supply power to the AC motor through the DC power grid as the conventional AC power grid does. Therefore, in the present embodiment, the driving module 3 includes two redundant driving units, so that when one of the driving units fails, the motor 4 can be driven by the other driving unit to ensure the normal operation of the escalator.

[0052] The drive module 3 includes a main drive unit and a backup drive unit which are redundant to each other, that is, the drive module 3 includes two redundant drive units; the input end of the main drive unit is connected to the DC power grid 1 and the output end of the control module 2, and the output end of the main drive unit is connected to the input end of the control module 2 and the motor 4; the input end of the backup drive unit is connected to the DC power grid 1 and the output end of the control module 2, and the output end of the backup drive unit is connected to the input end of the control module 2 and the motor 4.

[0053] In this embodiment, the motor 4 is an AC motor, which is powered by AC power, and the main drive unit and the standby drive unit have the same structure. The main drive unit includes a main inverter INV1 and main contactors KM11 and KM13, and the standby drive unit includes a standby inverter INV2 and standby contactors KM12 and KM14; the output end of the control module 2 is connected to the input end of the main inverter INV1 and the main contactors KM11 and KM13, the input end of the control module 2 is connected to the output end of the main inverter INV1, and the main contactor KM13 is connected to the AC motor; the output end of the control module 2 is connected to the input end of the standby inverter INV2 and the standby contactors KM12 and KM14, the input end of the control module 2 is connected to the output end of the standby inverter INV2, and the standby contactor KM14 is connected to the AC motor.

[0054] The control module 2 is used to: receive the fault signal and operating frequency of the main inverter INV1 or the standby inverter INV2; and control the opening and closing states of the main contactors KM11, KM13 or the standby contactors KM12, KM14 according to the fault signal and the operating frequency.

[0055] When the main contactors KM11 and KM13 are in the closed state and the standby contactors KM12 and KM14 are in the open state, the control module 2 controls the main inverter INV1 to drive the motor 4 with preset parameters; when the main contactors KM11 and KM13 are in the open state and the standby contactors KM12 and KM14 are in the closed state, the control module 2 controls the standby inverter INV2 to drive the motor 4 with preset parameters; the preset parameters include the running speed and output torque of the motor 4. The control module 2 controls the drive module 3 to drive the motor 4 with preset parameters, so that the escalator has a speed control function, which can automatically adjust the running speed and output torque of the motor 4 according to the flow of people riding the escalator, that is, adjust the running speed and output torque of the escalator, and then achieve the purpose of energy saving.

[0056] Next, the driving control method of the motor 4 in this embodiment is described in detail:

[0057] When the main inverter INV1 is required to work normally, the main contactors KM11 and KM13 remain closed. At this time, the standby inverter INV2 is in bypass, that is, the standby inverter INV2 is in a non-working state, and the standby contactors KM12 and KM14 remain open.

[0058] When the control module 2 detects the fault signal of the main inverter INV1, it means that the main inverter INV1 has a fault. At this time, the main contactors KM11 and KM13 are disconnected to put the main inverter INV1 in bypass, that is, the main inverter INV1 is put into a non-working state, so that the staff can repair the main inverter INV1; the control module 2 simultaneously closes the standby contactors KM12 and KM14 to enable the standby inverter INV2 to work normally, ensuring that the AC motor of the escalator can be driven normally by the standby drive unit when the escalator is restarted.

[0059] When the control module 2 detects the fault signal of the standby inverter INV2, it means that the standby inverter INV2 fails. At this time, the standby contactors KM12 and KM14 are disconnected to bypass the standby inverter INV2, that is, the standby inverter INV2 is in a non-working state, so that the staff can repair the standby inverter INV2; the control module 2 closes the main contactors KM11 and KM13 at the same time to make the main inverter INV1 work normally, ensuring that the AC motor of the escalator can be driven normally by the main drive unit when the escalator is restarted.

[0060] In this embodiment, the control module 2 monitors the operating frequencies of the main inverter INV1 and the standby inverter INV2. When the main inverter INV1 and the standby inverter INV2 are in an available state, that is, when the main inverter INV1 and the standby inverter INV2 can normally drive the AC motor of the escalator, the control module 2 can set the corresponding inverter to be enabled according to different needs according to the equipment status or the activation time point, so as to ensure the effective use of the inverter and extend its life.

[0061] For example, the time period for using the main inverter INV1 and the standby inverter INV2 is set at 1:1, such as odd / even days, odd / even weeks, or the first / second half of a month. The time period can be set by programming the internal program of the control module 2.

[0062] Due to the wide range of usage scenarios of escalators, the control and drive system disclosed in this embodiment is located in an ambient temperature of -20 to 60°C, an operating temperature of 25 to 60°C, and a maximum relative humidity of up to 98%. If electronic components (inverters) are not enabled for a long time, they are likely to be damaged; therefore, when the main inverter INV1 and the standby inverter INV2 are in a fault-free state, they are not allowed to be disabled for more than one month, that is, the time period is not allowed to be greater than one month.

[0063] When the escalator is braked and the downward load is large, the escalator is in a power generation state, that is, the motor 4 is in a power generation state. When the AC power grid is traditionally used to drive the motor, its drive module converts the electric energy into AC-DC-AC to drive the AC motor through AC. However, when the motor 4 is in a power generation state, the drive module can convert AC into DC, but because AC has frequency and phase angle, the drive module cannot convert the DC power of the DC bus into AC and feed it back to the AC power grid. Therefore, when the motor 4 is in a power generation state, the drive module converts AC into DC and then consumes the regenerative energy of the motor through an external braking resistor control unit and a braking resistor. That is, the energy generated by the motor 4 can only increase the DC bus voltage of the driving module 3, and cannot be directly fed back to the traditional AC power grid for reuse. Generally, the energy generated by the motor 4 is consumed in the form of heat through the braking resistor, which wastes the regenerative energy and increases the load of the air-conditioning system used for the environment in which the escalator is located.

[0064] In this embodiment, the output end of the driving module 3 is connected to the DC power grid 1; the driving module 3 receives the feedback signal of the motor 4, and sends the feedback signal to the control module 2, the control module 2 generates a state transition signal according to the feedback signal, and sends the state transition signal to the driving module 3; the driving module 3 receives the electric energy fed back by the motor 4 according to the state transition signal, and converts the electric energy into DC electric energy, and sends the DC electric energy to the DC power grid 1, so as to optimize the energy-saving effect.

[0065] When the motor 4 enters the power generation state, the driving module 3 converts the electric energy fed back by the motor 4 into DC electric energy, which is the regenerative energy. By sending the DC electric energy to the DC power grid 1, the DC power grid 1 can call on the regenerative energy, and the remaining devices in the DC power grid 1 can use the regenerative energy, thereby effectively utilizing the regenerative energy and improving the energy saving effect.

[0066] In this embodiment, the control module 2 includes a transformer unit, the input end of which is connected to the DC power grid 1; the transformer unit is used to convert the DC power grid 1 into multiple DC voltage power supplies; the DC power grid 1 is converted into multiple DC voltage power supplies of different voltage levels through the transformer module to supply power to equipment inside the escalator except the motor 4.

[0067] Embodiment 2

[0068] See also Figure 3 As shown, this embodiment discloses a second DC-powered escalator control and drive system, which differs from the first embodiment in that the structure of the main drive unit is different, and the structure of the standby drive unit is different.

[0069] In this embodiment, the motor 4 is an AC motor, which is powered by AC power, and the structures of the main drive unit and the standby drive unit are different. The main drive unit includes a main inverter INV and main contactors KM24 and KM25, and the standby drive unit includes a standby starting module ST and standby contactors KM21, KM22, and KM23; the output end of the control module 2 is connected to the input end of the main inverter INV and the main contactors KM24 and KM25, the input end of the control module 2 is connected to the output end of the main inverter INV, and the main contactors KM24 and KM25 are connected to the AC motor; the output end of the control module 2 is connected to the input end of the standby starting module ST and the standby contactors KM21, KM22, and KM23, the input end of the control module 2 is connected to the output end of the standby starting module ST, and the standby contactors KM21, KM22, and KM23 are connected to the AC motor.

[0070] The standby start module includes an inverter and a soft starter. The soft starter is a motor 4 control device that integrates the functions of soft start, soft stop, light load energy saving and multiple protection of the motor 4. Its main components are a three-phase phase-parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor 4; different methods are used to control the conduction angle of the three-phase phase-parallel thyristor so that the input voltage of the controlled motor 4 changes according to different requirements, so as to realize the smooth start of the motor 4 without impact during the whole start process, and the parameters in the start process, such as current limit value, start time, etc., can be adjusted according to the characteristics of the motor load.

[0071] Soft starters and frequency converters are two completely different products. Frequency converters are used in scenarios where speed regulation is required, and their output changes both the voltage and the frequency. Soft starters are actually voltage regulators, which are used in scenarios where motor 4 is started, and their output only changes the voltage but not the frequency. Frequency converters have all the functions of soft starters, but they are much more expensive than soft starters and their structures are much more complicated. Therefore, the starting module including the soft starter is used as a backup drive unit.

[0072] The control module 2 is used to: receive the fault signal and operating frequency of the main inverter INV or the standby starting module ST; control the opening and closing states of the main contactors KM24, KM25 or the standby contactors KM21, KM22, KM23 according to the fault signal and the operating frequency, and the standby contactors KM22 and KM23 are connected in parallel.

[0073] When the main contactors KM24 and KM25 are in the closed state, and the standby contactors KM21, KM22, and KM23 are in the open state, the control module 2 controls the main inverter INV to drive the motor 4 with preset parameters; when the main contactors KM24 and KM25 are in the open state, and the standby contactors KM21 and KM22 and KM23 are in the closed state, the control module 2 controls the standby starting module ST to drive the motor 4 with preset parameters, specifically: when the main contactors KM24, KM25 and the standby contactor KM23 are in the open state, and the standby contactors KM21 and KM22 are in the closed state, the control module 2 controls the standby starting module ST to drive the motor 4 with preset parameters, and the escalator runs upward at this time; when the main contactors KM24, KM25 and the standby contactor KM23 are in the open state, and the standby contactors KM21 and KM22 are in the closed state, the control module 2 controls the standby starting module ST to drive the motor 4 with preset parameters, and the escalator runs upward at this time; when the main contactors KM24, KM25 and When the standby contactor KM22 is in the disconnected state and the standby contactors KM21 and KM23 are in the closed state, the control module 2 controls the standby starting module ST to drive the motor 4 with preset parameters, and the escalator runs downward at this time; that is, in the standby driving unit of the present embodiment, when the motor 4 is driven by the started module ST, the running direction of the escalator is controlled by the opening and closing states of the standby contactors KM22 and KM23; the preset parameters include the running speed and output torque of the motor 4, and the control module 2 controls the driving module 3 to drive the motor 4 with preset parameters, so that the escalator has a speed control function, which can automatically adjust the running speed and output torque of the motor 4 according to the flow of people riding the escalator, that is, adjust the running speed and output torque of the escalator, and thus achieve the purpose of energy saving.

[0074] Next, the driving control method of the motor 4 in this embodiment is described in detail:

[0075] When the main inverter INV is required to work normally, the main contactors KM24 and KM25 remain closed. At this time, the standby starting module ST is in bypass, that is, the standby starting module ST is in a non-working state, and the standby contactors KM21, KM22, and KM23 remain open.

[0076] When the control module 2 detects a fault signal from the main inverter INV, it indicates that a fault has occurred in the main inverter INV. At this time, the main contactors KM24 and KM25 are disconnected to bypass the main inverter INV, that is, the main inverter INV is in a non-working state, so that the staff can repair the main inverter INV. The control module 2 closes the standby contactors KM21 and KM22 at the same time, or closes the standby contactors KM21 and KM23 at the same time according to the initial running direction of the escalator, so that the standby starting module ST can work normally, ensuring that the AC motor of the escalator can be driven normally by the standby drive unit when the escalator is restarted.

[0077] When the control module 2 detects the fault signal of the standby starting module ST, it means that the standby starting module ST fails. At this time, the standby contactors KM21, KM22, and KM23 are disconnected to bypass the standby starting module ST, that is, the standby starting module ST is in a non-working state, so that the staff can repair the standby starting module ST; the control module 2 simultaneously closes the main contactors KM24 and KM25 to enable the main inverter INV to work normally, ensuring that the AC motor of the escalator can be driven normally by the main drive unit when the escalator is restarted.

[0078] In this embodiment, the control module 2 monitors the operating frequencies of the main inverter INV and the standby starting module ST. When the main inverter INV and the standby starting module ST are in an available state, that is, when the main inverter INV and the standby starting module ST can normally drive the AC motor of the escalator, the control module 2 can set the corresponding drive unit (inverter or starting module) to be enabled according to different requirements according to the equipment status or the activation time point, so as to ensure the effective use of the drive unit (inverter or starting module) and extend its life.

[0079] For example, the time period for using the main inverter INV and the standby startup module ST is set at 1:29 respectively. The frequency of use of the main inverter INV should be higher than the frequency of use of the standby startup module ST. For example, the main inverter INV is started once every half a month, and the standby startup module ST is started once a month. The time period can be set by programming the internal program of the control module 2.

[0080] Due to the wide range of usage scenarios of escalators, the control and drive system disclosed in this embodiment is located in an ambient temperature of -20 to 60°C, the operating temperature is 25 to 60°C, and the maximum relative humidity can reach 98%. If the electronic components (inverter) are not enabled for a long time, it is easy to cause damage; therefore, when the main inverter INV and the standby start-up module ST are in a fault-free state, it is set that they cannot be disabled for more than one month, that is, the time period is not allowed to be greater than one month.

[0081] Embodiment 3

[0082] See also Figure 4 As shown, this embodiment discloses a third DC-powered escalator control and drive system, which differs from the first embodiment in that the structure of the main drive unit is different, the structure of the backup drive unit is different, and the power supply method of the motor 4 is different.

[0083] In this embodiment, the motor 4 is a DC motor, and its power supply method is DC power; the main drive unit includes a main speed regulator ESC1 and main contactors KM31 and KM33, and the standby drive unit includes a standby speed regulator ESC2 and standby contactors KM32 and KM34; the output end of the control module 2 is connected to the input end of the main speed regulator ESC1 and the main contactors KM31 and KM33, the input end of the control module 2 is connected to the output end of the main speed regulator ESC1, and the main contactors KM31 and KM33 are connected to the DC motor; the output end of the control module 2 is connected to the input end of the standby speed regulator ESC2 and the standby contactors KM32 and KM34, the input end of the control module 2 is connected to the output end of the standby speed regulator ESC2, and the standby contactors KM32 and KM34 are connected to the DC motor.

[0084] The control module 2 is used to: receive the fault signal and operating frequency of the main speed regulator ESC1 or the standby speed regulator ESC2; control the opening and closing state of the main contactor KM31, KM33 or the standby contactor KM32, KM34 according to the fault signal and the operating frequency; when the main contactors KM31 and KM33 are in the closed state and the standby contactors KM32 and KM34 are in the open state, the control module 2 controls the main speed regulator ESC1 to drive the motor 4 with preset parameters; when the main contactors KM31 and KM33 are in the open state and the standby contactors KM32 and KM34 are in the closed state, the control module 2 controls the standby speed regulator ESC2 to drive the motor 4 with preset parameters; the preset parameters include the running speed and output torque of the motor 4, and the control module 2 controls the drive module 3 to drive the motor 4 with the preset parameters, so that the escalator has a speed control function, and realizes automatic adjustment of the running speed and output torque of the motor 4 according to the flow of people riding the escalator, that is, adjusting the running speed and output torque of the escalator, thereby achieving the purpose of energy saving.

[0085] Next, the driving control method of the motor 4 in this embodiment is described in detail:

[0086] When the main speed regulator ESC1 is required to work normally, the main contactors KM31 and KM33 remain closed. At this time, the standby speed regulator ESC2 is in bypass, that is, the standby speed regulator ESC2 is in a non-working state, and the standby contactors KM32 and KM34 remain open.

[0087] When the control module 2 detects the fault signal of the main speed regulator ESC1, it means that the main speed regulator ESC1 has a fault. At this time, the main contactors KM31 and KM33 are disconnected to bypass the main speed regulator ESC1, that is, the main speed regulator ESC1 is in a non-working state, so that the staff can repair the main speed regulator ESC1; the control module 2 simultaneously closes the standby contactors KM32 and KM34 to enable the standby speed regulator ESC2 to work normally, ensuring that the AC motor of the escalator can be driven normally by the standby drive unit when the escalator is restarted.

[0088] When the control module 2 detects the fault signal of the standby speed regulator ESC2, it means that the standby speed regulator ESC2 has a fault. At this time, the standby contactors KM32 and KM34 are disconnected to put the standby speed regulator ESC2 in bypass, that is, the standby speed regulator ESC2 is in a non-working state, so that the staff can repair the standby speed regulator ESC2; the control module 2 simultaneously closes the main contactors KM31 and KM33 to enable the main speed regulator ESC1 to work normally, ensuring that the AC motor of the escalator can be driven normally by the main drive unit when the escalator is restarted.

[0089] In this embodiment, the control module 2 monitors the operating frequencies of the main speed regulator ESC1 and the standby speed regulator ESC2. When the main speed regulator ESC1 and the standby speed regulator ESC2 are both in an available state, that is, when the main speed regulator ESC1 and the standby speed regulator ESC2 can normally drive the AC motor of the escalator, the control module 2 can set the corresponding frequency converter to be enabled according to different needs according to the equipment status or the activation time point, so as to ensure the effective use of the frequency converter and extend its life.

[0090] For example, the time period for using the main speed regulator ESC1 and the backup speed regulator ESC2 is set at 1:1, such as odd / even days, odd / even weeks, or the first / second half of the month. The time period can be set by programming the internal program of the control module 2.

[0091] Due to the wide range of usage scenarios of escalators, the control and drive system disclosed in this embodiment is located in an ambient temperature of -20 to 60°C, the operating temperature is 25 to 60°C, and the maximum relative humidity can reach 98%. If the electronic components (inverter) are not enabled for a long time, they are likely to be damaged; therefore, when the main speed regulator ESC1 and the standby speed regulator ESC2 are in a fault-free state, it is set that they cannot be disabled for more than one month, that is, the time period is not allowed to be greater than one month.

[0092] The present invention replaces the AC power supply mode in the prior art with a DC power supply mode, which can effectively reduce the impact of power grid harmonics in the AC power supply mode on the escalator, and at the same time reduce the impact of harmonics generated by the escalator on the power grid; and in the AC power supply mode, a frequency converter rectifier module is also required to convert AC power into DC input. In the present invention, there is no link for converting AC input into DC input, which effectively improves conversion efficiency and reduces energy consumption; for the rail transit power supply system, the capacity of the substation / converter station can be greatly reduced, thereby reducing the construction investment of the rail transit station in the power supply system.

[0093] Furthermore, the regenerative energy of the motor 4 is sent to the DC power grid 4 through the drive module 3, thereby reducing the number of brake resistor control units and brake resistors used to consume the regenerative energy of the motor 4 in the escalator, and simplifying the control and drive system of the escalator.

[0094] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A DC powered escalator control and drive system, applied to an escalator including a motor, characterized in that: include: Control module and drive module; The input end of the driving module is connected to the output end of the control module and the DC power grid; the output end of the driving module is connected to the input end of the control module and the motor; the input end of the control module is connected to the DC power grid; The driving module includes two driving units which are redundant to each other.

2. A DC powered escalator control and drive system according to claim 1, characterized in that: The drive module includes a main drive unit and a backup drive unit which are redundant to each other; The input end of the main drive unit is connected to the DC power grid and the output end of the control module, and the output end of the main drive unit is connected to the input end of the control module and the motor; The input end of the standby drive unit is connected to the DC power grid and the output end of the control module, and the output end of the standby drive unit is connected to the input end of the control module and the motor.

3. A DC powered escalator control and drive system according to claim 2, characterized in that: When the motor is an AC motor, and the main drive unit and the standby drive unit have the same structure, the main drive unit includes a main frequency converter and a main contactor, and the standby drive unit includes a standby frequency converter and a standby contactor; The output end of the control module is connected to the input end of the main frequency converter and the main contactor, the input end of the control module is connected to the output end of the main frequency converter, and the main contactor is connected to the AC motor; The output end of the control module is connected to the input end of the standby frequency converter and the standby contactor, the input end of the control module is connected to the output end of the standby frequency converter, and the standby contactor is connected to the AC motor.

4. A DC powered escalator control and drive system according to claim 3, characterized in that: The control module is used for: Receiving a fault signal and an operating frequency of the main frequency converter or the standby frequency converter; Controlling the opening and closing state of the main contactor or the standby contactor according to the fault signal and the operating frequency; When the main contactor is in a closed state and the standby contactor is in an open state, the control module controls the main inverter to drive the motor with preset parameters; When the main contactor is in an open state and the standby contactor is in a closed state, the control module controls the standby inverter to drive the motor with preset parameters.

5. The DC-powered escalator control and drive system according to claim 2, characterized in that: When the motor is an AC motor, and the main drive unit and the standby drive unit have different structures, the main drive unit includes a main frequency converter and a main contactor, and the standby drive unit includes a standby starting module and a standby contactor; The output end of the control module is connected to the input end of the main frequency converter and the main contactor, the input end of the control module is connected to the output end of the main frequency converter, and the main contactor is connected to the AC motor; The output end of the control module is connected to the input end of the standby starting module and the standby contactor, the input end of the control module is connected to the output end of the standby starting module, and the standby contactor is connected to the AC motor.

6. A DC powered escalator control and drive system according to claim 5, characterized in that: The control module is used for: Receiving a fault signal and an operating frequency of the main frequency converter or the standby starting module; Controlling the opening and closing state of the main contactor or the standby contactor according to the fault signal and the operating frequency; When the main contactor is in a closed state and the standby contactor is in an open state, the control module controls the main inverter to drive the motor with preset parameters; When the main contactor is in an open state and the standby contactor is in a closed state, the control module controls the standby starting module to drive the motor with preset parameters.

7. A DC powered escalator control and drive system according to claim 2, characterized in that: When the motor is a DC motor, the main drive unit includes a main speed regulator and a main contactor, and the standby drive unit includes a standby speed regulator and a standby contactor; The output end of the control module is connected to the input end of the main speed regulator and the main contactor, the input end of the control module is connected to the output end of the main speed regulator, and the main contactor is connected to the DC motor; The output end of the control module is connected to the input end of the standby speed regulator and the standby contactor, the input end of the control module is connected to the output end of the standby speed regulator, and the standby contactor is connected to the DC motor.

8. A DC powered escalator control and drive system according to claim 7, characterized in that: The control module is used for: Receiving a fault signal and an operating frequency of the main speed regulator or the standby speed regulator; Controlling the opening and closing state of the main contactor or the standby contactor according to the fault signal and the operating frequency; When the main contactor is in a closed state and the standby contactor is in an open state, the control module controls the main speed regulator to drive the motor with preset parameters; When the main contactor is in an open state and the standby contactor is in a closed state, the control module controls the standby speed regulator to drive the motor with preset parameters.

9. The DC-powered escalator control and drive system according to claim 1, characterized in that: The DC grid is connected to the output end of the driving module; The driving module receives a feedback signal from the motor and sends the feedback signal to the control module; the control module generates a state conversion signal according to the feedback signal and sends the state conversion signal to the driving module; The driving module receives the electric energy fed back by the motor according to the state conversion signal, converts the electric energy into direct current electric energy, and sends the direct current electric energy to the direct current grid.

10. The DC-powered escalator control and drive system according to claim 1, characterized in that: The control module comprises a transformer unit, the input end of which is connected to the DC power grid; the transformer unit is used to convert the DC power grid into a multi-channel DC voltage power supply.

Images