CN108494293A - Principal and subordinate's communication circuit between mine-used frequency-converter and motor load balance control system - Google Patents
Principal and subordinate's communication circuit between mine-used frequency-converter and motor load balance control system Download PDFInfo
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- CN108494293A CN108494293A CN201810540351.XA CN201810540351A CN108494293A CN 108494293 A CN108494293 A CN 108494293A CN 201810540351 A CN201810540351 A CN 201810540351A CN 108494293 A CN108494293 A CN 108494293A
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- frequency converter
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- principal
- circuit
- communication circuit
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- 238000004891 communication Methods 0.000 title claims abstract description 132
- 238000002955 isolation Methods 0.000 claims abstract description 42
- 230000005611 electricity Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 241000233805 Phoenix Species 0.000 claims description 3
- 239000003245 coal Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000005065 mining Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention relates to the principal and subordinate's communication circuits and motor load balance control system between a kind of mine-used frequency-converter, the former includes the electric frequency converter circuit and power isolation circuit being sequentially connected electrically, electric frequency converter circuit is equipped with power input, the power input of output end connection 485 transponder chips of isolation of power isolation circuit；The latter includes master and slave frequency converter, master and slave frequency converter bus communication module and master and slave frequency converter principal and subordinate communication circuit are separately installed in the master board of master and slave frequency converter, respectively with host computer two-way communication link, two PORT COMs on principal and subordinate's communication circuit are connect with principal and subordinate's communication circuit of the master board of frequency converter where it and another frequency converter master and slave frequency converter bus communication module respectively.The present invention can make communication reliability between principal and subordinate's frequency converter and repair convenience be significantly improved, and have the operation occasion of certain risk suitable for working face in the pit.
Description
Technical field
The present invention relates between a kind of mine-used frequency-converter principal and subordinate's communication circuit and apply the shearer haulage of this circuit
Motor load balance control system has certain risk suitable for working face in the pit, needs reliable communications, is inconvenient to the behaviour repaired
Make occasion.
Background technology
Shearer haulage governing system generally use " one-to-one " mode, i.e. two frequency converters drag two traction electricity respectively
Machine, two frequency converters are arranged respectively to host and slave.Reason is that one-to-one mode is more prominent than one drag two mode advantage,
Each traction electric machine can be accurately controlled, control accuracy is high, and the control of trailer system and protective value are more perfect, trouble hunting
It is more convenient.Furthermore the frequency converter of one drag two mode is since the balancing the load without two motors controls, to prevent motor when type selecting
The allowance of overload will be stayed bigger, be unfavorable for cost control.
Since underground coal mine work condition environment is complicated and changeable, shearer haulage power deficiency is often to influence what coal mine normally produced
Serious problems.Under one-to-one control mode, the balancing the load control of two motors is most important, if control is bad, two
Motor output is inconsistent, and dynamic response is not caught up with, and is easy to cause single motor overload, motor can be burnt when serious.
In recent years, the control of traction motor for coal mining machine balancing the load is usually using frequency converter principal and subordinate's sharing of load based on optical fiber
Function, slave follow the torque actual value of host, are adjusted by speed and realize torque balance, to realize balancing the load control,
Typical application is principal and subordinate's function using ABB AB's ACS800 frequency converters.
ACS800 frequency converter principal and subordinate's links use fiber optic communication medium, optical fiber to be applied in shearer haulage governing system
When, it is limited by conditions such as bad mechanical strength, small, the optical fiber head underground vulnerable to pollution of bending radius, reliability and repair convenience are all
It is not satisfactory.
Invention content
The present invention is intended to provide a kind of principal and subordinate's communication circuit between mine-used frequency-converter and applying the motor of the circuit
Load balancing control system can make the communication reliability between principal and subordinate's frequency converter and repair convenience that can be significantly improved.
The main technical schemes of the present invention have：
A kind of principal and subordinate communication circuit between mine-used frequency-converter, including 485 transponder chips of isolation, electric frequency converter circuit and
Power isolation circuit, it is described electricity frequency converter circuit be equipped with power input, it is described electricity frequency converter circuit output end connection described in
The input terminal of power isolation circuit, the output end of the power isolation circuit connect the power supply of 485 transponder chips of the isolation
Input terminal, two PORT COMs of 485 transponder chips of the isolation are respectively as itself and the first frequency converter and the second frequency converter
The PORT COM communicated.
485 transponder chips of the isolation are preferably full duplex RS-485 transponder chips.
The electricity frequency converter circuit can use self-induction coil to realize boosting.
The power isolation circuit preferably uses DC-DC that single channel power supply chip is isolated.
It is carried out with the first frequency converter on 485 transponder chips of power input and the isolation of the electricity frequency converter circuit
The PORT COM of communication preferably connects the first connector through Shielded Twisted Pair, becomes with second on 485 transponder chips of the isolation
The PORT COM that frequency device is communicated preferably connects the second connector through Shielded Twisted Pair.
Double 20 core plug may be used in first connector.
Phoenix may be used in second connector can pulling and inserting type connector.
A kind of motor load balance control system, including primary transducer and from frequency converter, the primary transducer uses speed
Control, it is described to divide from frequency converter using direct torque, the master board of the primary transducer and from the master board of frequency converter
Primary transducer bus communication module is not installed and from frequency converter bus communication module, the primary transducer bus communication module and
From frequency converter bus communication module respectively with host computer and its where frequency converter master board two-way communication link, the master
Also be separately installed in the master board and the master board from frequency converter of frequency converter primary transducer principal and subordinate's communication circuit and
From the circuit board of frequency converter principal and subordinate's communication circuit, the primary transducer principal and subordinate communication circuit and equal from frequency converter principal and subordinate's communication circuit
Using principal and subordinate's communication circuit between any one aforementioned described mine-used frequency-converter, on the primary transducer principal and subordinate communication circuit with
Two PORT COMs that first frequency converter and the second frequency converter are communicated respectively with the master board of the primary transducer and institute
It states and is connected from frequency converter principal and subordinate's communication circuit communication, it is described to become with the first frequency converter and second from frequency converter principal and subordinate's communication circuit
Two PORT COMs that frequency device is communicated respectively with the master board from frequency converter and the primary transducer master-slave communication
Circuit communication connects.
The primary transducer bus communication module and it is described from frequency converter bus communication module respectively through RS-485 links with
Host computer connection, the primary transducer principal and subordinate communication circuit and from frequency converter principal and subordinate's communication circuit each by double pin
And fixing bolt realizes the connection and fixation between its circuit board and the master board of frequency converter where it, the primary transducer principal and subordinate
Through shielding multiple twin between communication circuit and the PORT COM communicated with the second frequency converter from frequency converter principal and subordinate's communication circuit
Line two-way communication link.
It the primary transducer principal and subordinate communication circuit and is all made of from frequency converter principal and subordinate's communication circuit and aforementioned be equipped with first and patch
Principal and subordinate's communication circuit of part and the second connector, the primary transducer principal and subordinate communication circuit and logical from frequency converter principal and subordinate's communication circuit
Cross the master board that respective first connector connects frequency converter where it, the primary transducer principal and subordinate communication circuit and from frequency conversion
Respective second connector of device principal and subordinate's communication circuit is connected with each other through Shielded Twisted Pair.
The beneficial effects of the invention are as follows：
Principal and subordinate's communication circuit between the mine-used frequency-converter of the present invention realizes the RS-485 master-slave communications between frequency converter,
Transmission medium using universal shield twisted-pair feeder replace fiber optic communication medium, efficiently solve fiber optic communication in down-hole application can
It is low by property, not easy care the problem of, and traffic rate is up to 4Mbit/s, is particularly suitable in having certain danger in working face in the pit
Operation occasion, have good user experience, reliability and safety.
Principal and subordinate's communication circuit support between the mine-used frequency-converter of the present invention directly takes electricity from the master board of frequency converter, then
It is supplied to its core circuit portions to use after isolation, boosting and voltage stabilizing, had not only saved the cost of circuit board, but also reduce electricity
The volume of road plate saves installation space.
Principal and subordinate's communication circuit between mine-used frequency-converter carries out the connection at communication interface using certain connector, is convenient for
Underground quick-replaceable circuit board.
Due to applying principal and subordinate's communication circuit between the mine-used frequency-converter, the control of traction motor for coal mining machine balancing the load
Also more reliable, the work of the motor load balance control system is more stable.
Description of the drawings
Fig. 1 is the schematic block circuit diagram of principal and subordinate's communication circuit between the mine-used frequency-converter of the present invention；
Fig. 2 is to carry out principal and subordinate's communication using principal and subordinate's communication circuit between the mine-used frequency-converter of the present invention between two frequency converters
One embodiment functional block diagram.
Specific implementation mode
As shown in Figure 1, the invention discloses principal and subordinate's communication circuit between a kind of mine-used frequency-converter, including isolation 485 is received
Generate device chip 2, electric frequency converter circuit 3 and power isolation circuit 4, the electricity frequency converter circuit be used for by external power supply be converted into
The matched power supply of operating voltage of 485 transponder chips of the isolation which is provided with power input, the electricity frequency converter circuit
Output end connect the input terminal of the power isolation circuit, the power isolation circuit is used for the electric frequency converter circuit
Output is filtered, voltage stabilizing, and the output end of the power isolation circuit connects the power input of 485 transponder chips of the isolation
End powers for 485 transponder chips of the isolation.Two PORT COMs of 485 transponder chips of the isolation are respectively as it
The PORT COM communicated with the first frequency converter and the second frequency converter.Isolation RS- where 485 transponder chips of the isolation
485 transponder chip circuits control for realizing the transmitting-receiving of RS-485 signals.
485 transponder chips of the isolation are preferably full duplex RS-485 transponder chips, have 2.5kV signals and power supply
It is isolated, +/- 15kV ESD are protected, open circuit and the input of short trouble protection receiver, traffic rate reach the advantages such as 16Mbps, work
It is DC 5V or 3.3V to make voltage.
The electricity frequency converter circuit can use self-induction coil to realize boosting, for provide frequency converter master board
DC3.3V power supplys are converted to DC5V power supplys.
The power isolation circuit preferably uses DC-DC that single channel power supply chip is isolated, and has the voltage stabilizings such as DC filtering circuit
Measure, the DC5V power supplys that electric frequency converter circuit is produced generate isolation RS-485 bus power sources after isolation, voltage stabilizing.
485 transponder chips of the isolation, electric frequency converter circuit and power isolation circuit are typically fabricated in one piece of circuit board
On.It is communicated with the first frequency converter on 485 transponder chips of power input and the isolation of the electricity frequency converter circuit
PORT COM preferably connect the first connector 1 through Shielded Twisted Pair, on 485 transponder chips of the isolation with the second frequency converter
The PORT COM communicated preferably connects the second connector 5 through Shielded Twisted Pair.
Double 20 core plug may be used in first connector, can be connected to corresponding frequency converter by double stitch
On double socket in master board, the master board for being connect with the communication of the master board of frequency converter and from frequency converter takes
Electricity.
Second connector may be used Phoenix can pulling and inserting type connector, it is logical for the principal and subordinate between two frequency converters
Underground quick-replaceable circuit board is convenient in fast connection.
RS-485 is communicated between principal and subordinate's communication circuit between the mine-used frequency-converter can realize frequency converter, compared to use
Fiber optic communication, it is at low cost, reliability is high and maintains easily, it can realize that the maximum traffic delay of link is 16ms.
Principal and subordinate's communication circuit between the mine-used frequency-converter uses intrinsic safety structure, meets following national standard：
GB3836.1-2000《Electric Equipment in Explosive Gas Atmosphere part 1：General Requirement》、GB 3836.2-2000《It is explosive
The 4th part of gaseous environment electrical installation：Essential safe type " i "》.
The invention also discloses a kind of (the referred to as motor load balance controls of traction motor for coal mining machine load balancing control system
System processed), as shown in Fig. 2, including primary transducer 1 and from frequency converter 4.The primary transducer and drag one respectively from frequency converter
Traction electric machine M, i.e. the one-to-one method of operation.The primary transducer connects three-phase alternating-current supply by terminal R1, S1, T1, passes through
Terminal U1, V1, W1 terminal connects left traction electric machine；It is described that three-phase alternating-current supply is connected by terminal R2, S2, T2 from frequency converter,
Right traction electric machine is connected by terminal U2, V2, W2 terminal.The primary transducer uses speed control, described to be used from frequency converter
Direct torque.The master board of the primary transducer and that primary transducer bus is separately installed with from the master board of frequency converter is logical
Fast module 2 and from frequency converter bus communication module 5, for realizing Modbus rtu protocols.The primary transducer bus communication mould
Block and from frequency converter bus communication module respectively with host computer 7 (i.e. coalcutter electric control system) and its respectively where frequency conversion
The master board two-way communication link of device.
Also it is separately installed with primary transducer in the master board and the master board from frequency converter of the primary transducer
Principal and subordinate's communication circuit 3 and circuit board from frequency converter principal and subordinate's communication circuit 6, the primary transducer principal and subordinate communication circuit and from frequency conversion
Device principal and subordinate's communication circuit is all made of principal and subordinate's communication circuit between any one mine-used frequency-converter above-mentioned.The primary transducer master
Two PORT COMs communicated with the first frequency converter and the second frequency converter from communication circuit respectively with the primary transducer
Master board and described from frequency converter principal and subordinate's communication circuit two-way communication link, it is described from frequency converter principal and subordinate's communication circuit with
Two PORT COMs that first frequency converter and the second frequency converter are communicated respectively with the master board from frequency converter and institute
State primary transducer master-slave communication circuit two-way communication link, primary transducer with from frequency converter by respective principal and subordinate's communication circuit it
Between communication connection realize RS-485 link connections.
When work, the host computer receives user velocity, direction control command, will be including control word, speed preset
Control instruction issue the primary transducer, meanwhile, primary transducer sends control word and torque reference to from frequency converter, from frequency conversion
Device is again to primary transducer Feedback control word and torque actual value.The host computer is also by the RS-485 link monitoring main transformers
Frequency device and status information from frequency converter.
The primary transducer bus communication module and it is described from frequency converter bus communication module respectively through RS-485 links with
Host computer connection, the primary transducer principal and subordinate communication circuit and from frequency converter principal and subordinate's communication circuit each by double pin
And fixing bolt realizes the connection and fixation between its circuit board and the master board of frequency converter where it, the primary transducer principal and subordinate
Through shielding multiple twin between communication circuit and the PORT COM communicated with the second frequency converter from frequency converter principal and subordinate's communication circuit
Line two-way communication link.Since the RS-485 communication links between principal and subordinate's frequency converter can be established by universal shield twisted-pair feeder, it is
System can be achieved to include control word, speed setting value, frequency setting value, status word, speed actual value, frequency actual value, electric current reality
Communication including actual value etc., solve the problems, such as it is low using reliability when fiber optic communication, be not easy to safeguard.
When equipped with the first connector and when the second connector, the primary transducer principal and subordinate communication circuit and from frequency converter principal and subordinate
The master board of frequency converter where communication circuit connects it by respective first connector, the primary transducer principal and subordinate are logical
Fast circuit and mutual through Shielded Twisted Pair such as 4 core Shielded Twisted Pairs from respective second connector of frequency converter principal and subordinate's communication circuit
Principal and subordinate's communication between frequency converter is realized in connection.To keep every frequency converter back panel wiring consistent, the communication core between master and slave frequency converter
Reversal connection line sequence is used when line connects.The primary transducer principal and subordinate communication circuit and from frequency converter principal and subordinate's communication circuit by its respective institute
Frequency converter master board provide power supply, be isolated, boost and voltage stabilizing after use, save corresponding principal and subordinate's communication circuit
Circuit board making cost is conducive to reduce circuit board volume, saves installation space.
The output torque dynamic equilibrium of the motor load balance control system control, control accuracy is high, at low cost, can
It is high by property, it safeguards simple.
Claims (10)
1. principal and subordinate's communication circuit between a kind of mine-used frequency-converter, it is characterised in that：Including 485 transponder chips of isolation, electricity frequency
Conversion circuit and power isolation circuit, the electricity frequency converter circuit are equipped with power input, the output of the electricity frequency converter circuit
End connects the input terminal of the power isolation circuit, and the output end of the power isolation circuit connects 485 transceivers of the isolation
The power input of chip, two PORT COMs of 485 transponder chips of the isolation respectively as it with the first frequency converter and
The PORT COM that second frequency converter is communicated.
2. principal and subordinate's communication circuit between mine-used frequency-converter as described in claim 1, it is characterised in that：The isolation 485 is received
Hair device chip is full duplex RS-485 transponder chips.
3. principal and subordinate's communication circuit between mine-used frequency-converter as described in claim 1, it is characterised in that：The electricity frequency converts electricity
Boosting is realized using self-induction coil in road.
4. principal and subordinate's communication circuit between mine-used frequency-converter as described in claim 1, it is characterised in that：The isolated from power electricity
Single channel power supply chip is isolated using DC-DC in road.
5. principal and subordinate's communication circuit between the mine-used frequency-converter as described in any one of claim 1-4 claims, special
Sign is：It is carried out with the first frequency converter on 485 transponder chips of power input and the isolation of the electricity frequency converter circuit
The PORT COM of communication connects the first connector through Shielded Twisted Pair, on 485 transponder chips of the isolation with the second frequency converter
The PORT COM communicated connects the second connector through Shielded Twisted Pair.
6. principal and subordinate's communication circuit between mine-used frequency-converter as claimed in claim 5, it is characterised in that：First connector
Using double 20 core plug.
7. principal and subordinate's communication circuit between mine-used frequency-converter as claimed in claim 5, it is characterised in that：Second connector
It can pulling and inserting type connector using Phoenix.
8. a kind of motor load balance control system, it is characterised in that：Including primary transducer and from frequency converter, the primary transducer
It is described to use direct torque, the master board of the primary transducer and the master control from frequency converter from frequency converter using speed control
It is separately installed with primary transducer bus communication module in making sheet and from frequency converter bus communication module, the primary transducer bus is logical
Fast module and from frequency converter bus communication module respectively with host computer and its where frequency converter master board two-way communication connect
It connects, it is logical that primary transducer principal and subordinate is also separately installed in the master board and the master board from frequency converter of the primary transducer
Fast circuit and circuit board from frequency converter principal and subordinate's communication circuit, the primary transducer principal and subordinate communication circuit and logical from frequency converter principal and subordinate
Fast circuit is all made of principal and subordinate's communication circuit between the mine-used frequency-converter described in any one of claim 1-7 claims,
The two PORT COMs difference communicated with the first frequency converter and the second frequency converter on the primary transducer principal and subordinate communication circuit
With the master board of the primary transducer and it is described connect from frequency converter principal and subordinate's communication circuit communication, it is described logical from frequency converter principal and subordinate
Two PORT COMs communicated with the first frequency converter and the second frequency converter on fast circuit respectively with the master from frequency converter
Control panel is connected with the primary transducer master-slave communication circuit communication.
9. motor load balance control system as claimed in claim 8, it is characterised in that：The primary transducer bus communication mould
Block and it is described respectively connect from frequency converter bus communication module with the host computer through RS-485 links, the primary transducer principal and subordinate
Communication circuit and from frequency converter principal and subordinate's communication circuit each by double pin and fixing bolt realize its circuit board with its where
Connection between the master board of frequency converter and fixation, the primary transducer principal and subordinate communication circuit and from frequency converter principal and subordinate's communication circuit
Through Shielded Twisted Pair two-way communication link between the PORT COM that upper and the second frequency converter is communicated.
10. motor load balance control system as claimed in claim 9, it is characterised in that：The primary transducer principal and subordinate communication
Circuit and the principal and subordinate's communication being all made of from frequency converter principal and subordinate's communication circuit between the mine-used frequency-converter described in claim 5,6 or 7
Circuit, the primary transducer principal and subordinate communication circuit connect it with from frequency converter principal and subordinate's communication circuit by respective first connector
The master board of place frequency converter, the primary transducer principal and subordinate communication circuit and from frequency converter principal and subordinate communication circuit respective second
Connector is connected with each other through Shielded Twisted Pair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810540351.XA CN108494293A (en) | 2018-05-30 | 2018-05-30 | Principal and subordinate's communication circuit between mine-used frequency-converter and motor load balance control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810540351.XA CN108494293A (en) | 2018-05-30 | 2018-05-30 | Principal and subordinate's communication circuit between mine-used frequency-converter and motor load balance control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108494293A true CN108494293A (en) | 2018-09-04 |
Family
ID=63352606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810540351.XA Withdrawn CN108494293A (en) | 2018-05-30 | 2018-05-30 | Principal and subordinate's communication circuit between mine-used frequency-converter and motor load balance control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108494293A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532118A (en) * | 2020-11-11 | 2021-03-19 | 上海辛格林纳新时达电机有限公司 | Frequency converter multi-machine synchronous control system and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201854229U (en) * | 2010-10-25 | 2011-06-01 | 四川省安普瑞自动化设备有限公司 | Multi-motor synchronous control system for band conveyor |
| CN203398982U (en) * | 2013-04-26 | 2014-01-15 | 武汉港迪电气有限公司 | A combining device for low-voltage large-power frequency converters |
| CN206481216U (en) * | 2017-02-24 | 2017-09-08 | 长春键坤联合科技发展有限公司 | Transformation isolation module and encoder |
| CN208257699U (en) * | 2018-05-30 | 2018-12-18 | 天地科技股份有限公司上海分公司 | Principal and subordinate's communication circuit and motor load balance control system between mine-used frequency-converter |
-
2018
- 2018-05-30 CN CN201810540351.XA patent/CN108494293A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201854229U (en) * | 2010-10-25 | 2011-06-01 | 四川省安普瑞自动化设备有限公司 | Multi-motor synchronous control system for band conveyor |
| CN203398982U (en) * | 2013-04-26 | 2014-01-15 | 武汉港迪电气有限公司 | A combining device for low-voltage large-power frequency converters |
| CN206481216U (en) * | 2017-02-24 | 2017-09-08 | 长春键坤联合科技发展有限公司 | Transformation isolation module and encoder |
| CN208257699U (en) * | 2018-05-30 | 2018-12-18 | 天地科技股份有限公司上海分公司 | Principal and subordinate's communication circuit and motor load balance control system between mine-used frequency-converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532118A (en) * | 2020-11-11 | 2021-03-19 | 上海辛格林纳新时达电机有限公司 | Frequency converter multi-machine synchronous control system and control method |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180904 |
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| WW01 | Invention patent application withdrawn after publication |