Industrial equipment and frequency conversion control system thereof

Abstract

The present invention discloses an industrial device and a frequency conversion control system thereof. Since Ethernet communication has the advantages of high speed and low cost, the communication method based on Ethernet communication in the present application can improve the efficiency of data interaction between frequency converter control systems and reduce costs. In addition, since the present application is based on two Ethernet interfaces set on each frequency converter, the frequency converters are connected into a chain structure, so that the structures of the frequency converters can be unified, thereby reducing the design cost.

Description

Technical Field

[0001] The present invention relates to the field of frequency converters, in particular to a frequency conversion control system. The present invention also relates to industrial equipment. Background Art

[0002] Some industrial equipment (such as belt conveyors) need to use multiple motors at the same time and ensure that the operating status of each motor is the same. At this time, it is necessary to configure a corresponding frequency converter for each motor (multiple frequency converters are collectively referred to as frequency conversion control systems), and data interaction is required between each frequency converter in order to achieve coordinated control of multiple motors and related management of the frequency converters. However, the existing technology lacks a mature frequency conversion control system, resulting in high cost and low working efficiency of the frequency conversion control system.

[0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present. Summary of the invention

[0004] An object of the present invention is to provide a frequency conversion control system, which improves communication efficiency, reduces costs, unifies the frequency converter structure, and reduces design costs; another object of the present invention is to provide an industrial device including the above-mentioned frequency conversion control system, which improves communication efficiency, reduces costs, unifies the frequency converter structure, and reduces design costs.

[0005] In order to solve the above technical problems, the present invention provides a frequency conversion control system, comprising:

[0006] A master inverter having two Ethernet interfaces, used to send out control parameters corresponding to its own operating state through its own Ethernet interface in the form of broadcast, and also used to send out a query instruction marked with a communication address of a designated slave inverter through its own Ethernet interface;

[0007] One or more slave frequency converters each having two Ethernet interfaces, configured to control their own operation according to the received control parameters so as to achieve the operating state of the master frequency converter, and to send the data specified by the received query instruction to the master frequency converter through their own Ethernet interfaces;

[0008] The two Ethernet interfaces on each of the frequency converters are connected to each other, and the Ethernet interfaces of the frequency converters connect the frequency converters into a chain structure.

[0009] Preferably, the main frequency converter is located at one end of the chain structure.

[0010] Preferably, the query instruction is query data of status data.

[0011] Preferably, the step of sending the query instruction marked with the communication address of the designated slave inverter through the Ethernet interface thereof is as follows:

[0012] In a polling manner, query instructions marked with the communication addresses of the designated slave inverters are sent out in sequence through the Ethernet interface of the device itself, so as to query and obtain the status data of each of the slave inverters.

[0013] Preferably, the sending of the control parameters corresponding to the operating state of the device through the Ethernet interface of the device in the form of broadcast is specifically:

[0014] The control parameters corresponding to its own operating status are sent out through its own Ethernet interface in the form of User Datagram Protocol UDP broadcast.

[0015] Preferably, the frequency conversion control system further comprises a prompter connected to the main frequency converter;

[0016] The main frequency converter is also used to control the prompter to prompt the received query data.

[0017] Preferably, the prompter is a display.

[0018] Preferably, the frequency conversion control system further comprises an alarm connected to the main frequency converter;

[0019] The main frequency converter is also used to control the alarm to sound an alarm when no query data is received within a preset period of time after the query instruction is issued.

[0020] Preferably, the alarm is a voice announcer.

[0021] In order to solve the above technical problems, the present invention further provides an industrial equipment, comprising the above-mentioned variable frequency control system.

[0022] The present invention provides a frequency conversion control system. Since Ethernet communication has the advantages of high speed and low cost, the present application uses Ethernet communication to communicate between frequency converters, which can improve the efficiency of data interaction between frequency converter control systems and reduce costs. In addition, since the present application is based on two Ethernet interfaces set on each frequency converter, the frequency converters are connected into a chain structure, so that the structures of the frequency converters can be unified, reducing the design cost.

[0023] The present invention also provides an industrial device having the same beneficial effects as the up-conversion control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the structure of a frequency conversion control system provided by the present invention;

[0026] Figure 2 A schematic diagram of the structure of the Ethernet interface on the frequency converter provided by the present invention;

[0027] Figure 3 A schematic structural diagram of another frequency conversion control system provided by the present invention. DETAILED DESCRIPTION

[0028] The core of the present invention is to provide a frequency conversion control system, which improves communication efficiency, reduces costs, unifies the frequency converter structure, and reduces design costs; another core of the present invention is to provide an industrial equipment including the above-mentioned frequency conversion control system, which improves communication efficiency, reduces costs, unifies the frequency converter structure, and reduces design costs.

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a frequency conversion control system provided by the present invention, the frequency conversion control system comprises:

[0031] The master inverter 1 having two Ethernet interfaces is used to send out the control parameters corresponding to its own operating state through its own Ethernet interface in the form of broadcast, and is also used to send out the query instruction marked with the communication address of the designated slave inverter 2 through its own Ethernet interface;

[0032] One or more slave inverters 2 each having two Ethernet interfaces, for controlling their own operation according to the received control parameters so as to achieve the operating state of the master inverter 1, and sending the data specified by the received query instruction to the master inverter 1 through its own Ethernet interface;

[0033] The two Ethernet interfaces on each frequency converter are connected to each other, and the Ethernet interfaces of the frequency converters connect the frequency converters into a chain structure.

[0034] Specifically, to better illustrate the embodiments of the present invention, please refer to Figure 2 , Figure 2 The present invention provides a structural schematic diagram of the Ethernet interface on the inverter. In order to improve the efficiency of data interaction between inverters and reduce communication costs, the embodiment of the present invention adopts Ethernet communication, which is an efficient and low-cost communication method. Considering the need for the master inverter 1 to communicate data with each slave inverter 2, if a large number of Ethernet interfaces are directly set on the master inverter 1 to realize the network cable connection between the master inverter 1 and each slave inverter 2, it is necessary to redesign the main board of the master inverter 1, which increases the size of the master inverter 1. Moreover, when the master inverter 1 in the system fails, it is impossible to flexibly switch other slave inverters 2 to the master inverter 1, and the flexibility is poor. Therefore, after thinking, the applicant found that two Ethernet interfaces can be set on each inverter, and the two Ethernet interfaces on each inverter are connected to each other. In this way, the inverters can be connected in series through the Ethernet cable 3 to realize Ethernet communication between the inverters.

[0035] Specifically, Figure 1 For example, when the master inverter 1 sends data through the Ethernet interface, the data can be transmitted to the slave inverter 2 of station number 2 through the Ethernet cable 3, and can be directly sent to the slave inverter 2 of station number 3 through the Ethernet interface of station number 2. Similarly, the data sent by the master inverter 1 can be transmitted to each slave inverter 2 through the Ethernet channel, with high transmission efficiency and low cost.

[0036] Among them, since each inverter in the present application has two Ethernet interfaces, it is convenient to unify the specifications of each inverter, reduce the design cost, prevent the main inverter 1 from being designed to be larger, and flexibly switch the slave inverter 2 to the main inverter 1.

[0037] Specifically, the master inverter 1 first operates based on relevant control instructions and forms its own operating state, and then the master inverter 1 needs to send control parameters corresponding to its own operating state to each slave inverter 2 so that each slave inverter 2 maintains an operating state consistent with itself.

[0038] The control parameters may be of various types, such as a given frequency, an operating frequency of the main inverter 1 , and a torque current, etc., which are not limited in the embodiment of the present invention.

[0039] Specifically, Figure 2As shown, the two Ethernet interfaces on the inverter need to be connected together (sharing a MAC address). The two Ethernet interfaces are not distinguished from each other and can be plugged in and out interchangeably. In this way, the data sent by the master inverter 1 can be directly sent to each slave inverter 2 without being processed internally by any slave inverter 2, thereby improving communication efficiency.

[0040] Specifically, a specific implementation of the present invention is:

[0041] The inverter realizes one master and two slave motor control. The three inverters are configured as one master and two slaves. The inverters are cascaded using network cables. The Ethernet communication IP of each inverter is set in the same network segment and the IPs are different. The network address configuration table of the frequency conversion control system is as follows Table 1:

[0042] Table 1

[0043] Station No. Host (main inverter 1) Slave (Slave inverter 2) 1 Slave 2 IP address 192.168.1.2 192.168.1.3 192.168.1.4 MAC Address 9c:5a:44:3c:89:d0 02:00:00:00:00:00 52:54:4c:19:f7:42

[0044] Specifically, in the master-slave control mode, the host sends control parameters to all slaves through UDP broadcast in a cycle of 1ms. The slaves update the control parameters sent by the host. The host can query the status of a slave in each cycle, and complete the status query of all slaves every 2 cycles. Please refer to Table 2 and Table 3 below. Table 2 is the data structure table of Ethernet master-slave communication, and Table 3 is the data content table of Ethernet master-slave communication:

[0045] Table 2

[0046]

[0047] Table 3

[0048]

[0049]

[0050] Specifically, the host sends broadcast data to the entire network, and the destination IP (Internet Protocol) is xxx.xxx.xxx.255, and the destination MAC (Media Access Control) address is FF:FF:FF:FF:FF:FF. This data passes through the UDP layer and the IP layer and reaches the data link layer. The data propagates on the entire Ethernet, and other slaves in this layer will determine the destination MAC address. Since the destination MAC address is FF:FF:FF:FF:FF:FF, all slaves that receive the data will ignore the comparison of the MAC address and process the received data. There is no need for the slave to receive and forward, and all slaves will receive the host's broadcast data almost at the same time.

[0051] When the status information of a specific slave needs to be obtained, the host sends a data request to the corresponding IP of the slave. The target IP sent is the IP set by the slave, the target MAC address is the MAC address of the slave, and the UDP data content is the filled "request slave reply data command", which is the query instruction. This data passes through the UDP layer and the IP layer and reaches the data link layer. The data is transmitted on the entire Ethernet. In this layer, all other slaves will determine whether their own MAC address matches the destination MAC address. If it does not match, it will not be processed and the data will be discarded directly. If the MAC addresses are consistent, this data will pass through the IP layer and the UDP layer to reach the application receiving the data. After the slave passes the verification, it will reply to the host target IP with its own status.

[0052] The present invention provides a frequency conversion control system. Since Ethernet communication has the advantages of high speed and low cost, the present application uses Ethernet communication to communicate between frequency converters, which can improve the efficiency of data interaction between frequency converter control systems and reduce costs. In addition, since the present application is based on two Ethernet interfaces set on each frequency converter, the frequency converters are connected into a chain structure, so that the structures of the frequency converters can be unified, reducing the design cost.

[0053] To better illustrate the embodiments of the present invention, please refer to Figure 3 , Figure 3 A schematic diagram of the structure of another frequency conversion control system provided by the present invention, based on the above embodiment:

[0054] As a preferred embodiment, the main inverter 1 is located at one end of the chain structure.

[0055] Specifically, arranging the main frequency converter 1 at one end of the chain structure can facilitate the differentiated management of the main frequency converter 1 and improve the management efficiency.

[0056] Of course, in addition to this position, the main inverter 1 may also be located at other positions of the chain structure, which is not limited in the embodiment of the present invention.

[0057] As a preferred embodiment, the query instruction is query data of status data.

[0058] Specifically, the status data is relatively important data of each slave inverter 2, which is related to the stability of operation of each motor.

[0059] Of course, in addition to the status data, the data queried by the query instruction may also be of other types, which is not limited in the embodiment of the present invention.

[0060] As a preferred embodiment, the query instruction marked with the communication address of the designated slave inverter 2 is sent out through its own Ethernet interface as follows:

[0061] In a polling manner, query instructions marked with the communication addresses of the designated slave frequency converters 2 are sent out in sequence through the Ethernet interface thereof, so as to query and obtain the status data of each slave frequency converter 2 .

[0062] Specifically, querying the status data of each slave inverter 2 in turn in a polling manner can improve the query efficiency of the status data and improve the degree of automation.

[0063] Of course, in addition to the polling method, the status data of a single inverter may also be queried each time under the control of the human-machine interaction device, which is not limited in the embodiment of the present invention.

[0064] As a preferred embodiment, the control parameters corresponding to the operating status of the system are sent out through the Ethernet interface of the system in the form of broadcast:

[0065] The control parameters corresponding to its own operating status are sent out through its own Ethernet interface in the form of User Datagram Protocol UDP broadcast.

[0066] Specifically, the UDP broadcast format has the advantages of high speed and strong stability.

[0067] Of course, in addition to the UDP broadcasting form, data broadcasting may also be in other forms, which are not limited in the embodiment of the present invention.

[0068] As a preferred embodiment, the frequency conversion control system further includes a prompter 4 connected to the main frequency converter 1;

[0069] The main frequency converter 1 is further used to control the prompter 4 to prompt the received query data.

[0070] Specifically, in order to facilitate the staff to receive the queried data immediately, the main inverter 1 in the embodiment of the present invention can also control the prompter 4 to prompt the received query data.

[0071] As a preferred embodiment, the prompter 4 is a display.

[0072] Specifically, the display has the advantages of intuitive and lasting prompting effect and long service life.

[0073] Of course, in addition to the display, the prompter 4 can also be of other types, which is not limited in the embodiment of the present invention.

[0074] As a preferred embodiment, the frequency conversion control system further includes an alarm 5 connected to the main frequency converter 1;

[0075] The main frequency converter 1 is also used to control the alarm device 5 to sound an alarm when no query data is received within a preset period of time after the query instruction is issued.

[0076] Specifically, the preset duration can be set independently, and the embodiment of the present invention does not limit this.

[0077] Among them, considering that the slave inverter 2 may not be able to feedback the query data, in this case the master inverter 1 can make a judgment through timing, that is, the timing can be started after a query command is issued to a slave inverter 2. If the query data is still not received after the preset time, then it can be determined that the slave inverter 2 is faulty, and the alarm 5 can be controlled to alarm so that the staff can carry out timely maintenance, thereby improving work efficiency.

[0078] As a preferred embodiment, the alarm 5 is a voice announcer.

[0079] Among them, the voice announcer can announce the specific fault of the slave inverter 2, and the cost is relatively low.

[0080] Of course, in addition to the voice announcer, the alarm 5 can also be of other types, which is not limited in the embodiment of the present invention.

[0081] The present invention also provides an industrial device, comprising the variable frequency control system as described in the above embodiment.

[0082] For an introduction to the industrial equipment provided by the embodiment of the present invention, please refer to the aforementioned embodiment of the frequency conversion control system, and the embodiment of the present invention will not be described in detail here.

[0083] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. It should also be noted that in this specification, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0084] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A frequency conversion control system, characterized in that: include: A master inverter having two Ethernet interfaces, used to send out control parameters corresponding to its own operating state through its own Ethernet interface in the form of broadcast, and also used to send out a query instruction marked with a communication address of a designated slave inverter through its own Ethernet interface; One or more slave frequency converters each having two Ethernet interfaces, configured to control their own operation according to the received control parameters so as to achieve the operating state of the master frequency converter, and to send the data specified by the received query instruction to the master frequency converter through their own Ethernet interfaces; The two Ethernet interfaces on each of the frequency converters are connected to each other, and the Ethernet interfaces of the frequency converters connect the frequency converters into a chain structure; Each of the frequency converters is connected to a motor in a one-to-one correspondence, and the master frequency converter and the slave frequency converter are used to control the motor corresponding to themselves; The query instruction is query data of status data; The specific method of sending the query instruction marked with the communication address of the designated slave inverter through the Ethernet interface thereof is as follows: In a polling manner, query instructions marked with the communication addresses of the designated slave inverters are sent out in sequence through the Ethernet interface of the device itself, so as to query and obtain the status data of each of the slave inverters.

2. The frequency conversion control system according to claim 1, characterized in that: The main frequency converter is located at one end of the chain structure.

3. The frequency conversion control system according to claim 1, characterized in that: The method of sending the control parameters corresponding to the operating state of the system through the Ethernet interface of the system in the form of broadcast is as follows: The control parameters corresponding to its own operating status are sent out through its own Ethernet interface in the form of User Datagram Protocol UDP broadcast.

4. The frequency conversion control system according to any one of claims 1 to 3, characterized in that: The frequency conversion control system also includes a prompter connected to the main frequency converter; The main frequency converter is also used to control the prompter to prompt the received query data.

5. The frequency conversion control system according to claim 4, characterized in that: The prompter is a display.

6. The frequency conversion control system according to claim 4, characterized in that: The frequency conversion control system also includes an alarm connected to the main frequency converter; The main frequency converter is also used to control the alarm to sound an alarm when no query data is received within a preset period of time after the query instruction is issued.

7. The frequency conversion control system according to claim 6, characterized in that: The alarm is a voice announcer.

8. An industrial equipment, characterized in that: It comprises the frequency conversion control system as claimed in any one of claims 1 to 7.

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