CN203095050U - Constant voltage frequency ratio control system of belt conveyor driven by a plurality of motors - Google Patents

Constant voltage frequency ratio control system of belt conveyor driven by a plurality of motors Download PDF

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Publication number
CN203095050U
CN203095050U CN 201320111251 CN201320111251U CN203095050U CN 203095050 U CN203095050 U CN 203095050U CN 201320111251 CN201320111251 CN 201320111251 CN 201320111251 U CN201320111251 U CN 201320111251U CN 203095050 U CN203095050 U CN 203095050U
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China
Prior art keywords
frequency converter
frequency
constant voltage
motors
main frame
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Expired - Fee Related
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CN 201320111251
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Chinese (zh)
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魏学森
刘明光
郭少明
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Shandong Xinfengguang Electronic Technology Development Co., Ltd.
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Shandong Xinfeng Photoelectric Science & Technology Development Co Ltd
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Abstract

The utility model discloses a constant voltage frequency ratio control system of a belt conveyor driven by a plurality of motors. The belt conveyor is driven by a plurality of alternating-current asynchronous motors with the same specification. The constant voltage frequency ratio control system of the belt conveyor driven by the motors is characterized by comprising frequency converters, wherein the number of the frequency converters is equal to the number of the alternating-current asynchronous motors, one of the frequency converters is a main frequency converter, the rest of the frequency converters are slave frequency converters, the main frequency converter achieves communication with an upper computer, the power source input end of each frequency converter is connected with a power grid, the power source output end of each frequency converter is connected with the stator input end of each corresponding alternating-current asynchronous motor, and each frequency converter can detect the active current of each corresponding alternating-current asynchronous motor. According to the constant voltage frequency ratio control system of the belt conveyor driven by the motors, the fact that output torque of each motor is basically consistent is ensured, the problem that the motors are the same in rotary speed but different in output torque due to the facts that the sizes of rotary drums are different, and the sizes of belt contacts are different is solved, and therefore the belt conveyor can be stably started, shut down, and work in high efficiency.

Description

Many motors drag the constant voltage and frequency ratio control system of band conveyor
Technical field
The utility model relates to the constant voltage and frequency ratio control system that a kind of many motors drag band conveyor, in particular, relates in particular to a kind of many motors of the power basically identical of each electrical motor output that can effectively guarantee and drags the constant voltage and frequency ratio control system of band conveyor.
Background technology
Domestic existing most of band conveyors all adopt power frequency to drag, and less use frequency converter drives.Because the long-term power frequency operation of motor is problem such as fluid coupling efficient in addition, it is higher to cause belt transporter to move power consumption, very uneconomical; Because motor can't adopt soft soft stopping, mechanically produce severe impact, the wearing and tearing of acceleration mechanical simultaneously; Problems such as the wearing and tearing of belt, fluid coupling and maintenance all can be brought the cost issues of very big number to enterprise in addition.This is inconsistent with present creation environment type, energy-saving, friendly type society.Therefore, band conveyor carries out the frequency conversion transformation to saving the social energy, increasing economic benefit of enterprises and all have the very economic implications and the social effect of reality.
Present stage,, how to drive multiple electric motors simultaneously with a bigger frequency converter of power adopting frequency converter to drive in the belt conveyor system that many motors drag.Though the frequency of frequency converter output is identical for every motor, because the influence of factors such as cylinder sizes, belt contact causes the real output moment of torsion of each motor to be not quite similar, horsepower output also is not quite similar.Reduced the service life of motor, belt, this also is that frequency converter drags the less reason place of application in the belt conveyor system at multimachine.
Drag in the band conveyor start-up course at many motors, if control is improper, can cause the motor output torque different, even the motor that causes having is in motoring condition, and the motor that has is in generating state.For frequency converter, this situation is fatal, when motor is generating state; can charge to electric capacity by the flywheel diode of IGBT, because the electric capacity front end is a diode rectification, energy Flow is irreversible; the voltage of electric capacity can be more and more higher, until the unit overvoltage protection.Therefore, select suitable mode, making multimachine drag each motor output torque in band conveyor startup, operation and the stopping process consistent is that constant voltage and frequency ratio controllable type frequency converter drives the key point that multimachine drags band conveyor.
Summary of the invention
The utility model provides a kind of many motors of the power basically identical of each electrical motor output that can effectively guarantee to drag the constant voltage and frequency ratio control system of band conveyor in order to overcome the shortcoming of above-mentioned technical matters.
Many motors of the present utility model drag the constant voltage and frequency ratio control system of band conveyor, band conveyor is driven by the identical AC asynchronous motor of a plurality of specifications, its special feature is: described constant voltage and frequency ratio control system comprises the frequency converter that number equates with the AC asynchronous motor number, wherein a frequency converter is the main frame frequency converter, all the other are the slave frequency converter, and the main frame frequency converter is realized the communication with upper computer; The power input of each frequency converter is connected with electrical network, and power output end is connected with the stator input end of corresponding AC asynchronous motor; Be connected through order wire between main frame frequency converter and the slave frequency converter, every frequency converter all can detect the active current of corresponding AC asynchronous motor.
Many motors of the present utility model drag the constant voltage and frequency ratio control system of band conveyor, and the order wire between main frame frequency converter and the slave frequency converter is an optical fiber communication line.Adopt ferry optics comunication, improved communication efficiency and reliability between each frequency converter.
The beneficial effects of the utility model are: constant voltage and frequency ratio control system of the present utility model, in the process that band conveyor starts, moves and stops, the main frame frequency converter is with the mode control frequency of constant voltage and frequency ratio and the output of voltage, and self running frequency, active current is broadcast to all slave frequency converters; The slave frequency converter at first moves according to the mode of constant voltage and frequency ratio with the frequency that receives, and then by regulating the running frequency of self, and self the difference of active volt-amperes and the active volt-amperes of main frame frequency converter transmission is adjusted in the allowed band; Like this, make the running frequency basically identical of each frequency converter output frequency basically identical, each electrical motor; Also make each frequency converter export active current basically identical, each output power of motor basically identical, thereby guaranteed each motor output torque basically identical, overcome because not of uniform size the causing of cylinder sizes, belt contact causes motor with rotating speed but the inconsistent problem of output torque.
Constant voltage and frequency ratio control system of the present utility model can be used constant voltage and frequency ratio controllable type frequency converter to drive multimachine and drag band conveyor, starts reposefully, shuts down, with higher efficient converting operation; When being in an emergency, protect motor, frequency converter reliably.
Description of drawings
Fig. 1 is the constant voltage and frequency ratio control VF curve synoptic diagram of band torque magnification of the present utility model;
Fig. 2 is the mechanical specialities scheme drawing of the AC asynchronous motor of constant voltage and frequency ratio control of the present utility model;
Fig. 3 drags the schematic diagram of the constant voltage and frequency ratio control system of band conveyor for many motors of the present utility model;
Fig. 4 is a constant voltage and frequency ratio frequency conversion speed-adjusting system schematic diagram;
Fig. 5 is the program flow diagram of main frame frequency converter in the control method of the present utility model;
Fig. 6 is the program flow diagram of slave frequency converter in the control method of the present utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
As shown in Figure 3, provided the schematic diagram that many motors of the present utility model drag the constant voltage and frequency ratio control system of band conveyor, shown AC asynchronous motor is used to order about the operation of band conveyor, and the specification of all electrical motors is identical; Each AC asynchronous motor is controlled it by a frequency converter.One is the main frame frequency converter in all frequency converters, and remaining is the slave frequency converter, and the main frame frequency converter is used to realize and the communicating by letter of upper computer.The power input of frequency converter is connected with electrical network, and power output end is connected with the stator input end of respective electrical motivation; Communicate by optical fiber between main frame frequency converter and all the slave frequency converters, frequency converter also can detect the active current size of respective electrical motivation operation simultaneously.
The frequency converter that the utility model uses is the voltage-source type frequency converter, and it is become by voltage transformer, ac-dc-ac inverter controller, control system and bypass group.It is AC asynchronous motor that controlled many motors drag band conveyor.Adopt ferry optics comunication between each frequency converter, improved communication efficiency and reliability.
The principle explanation: when induction motor drive, total hope keeps main flux Be rated value.By the every emf phase effective value of asynchronous dynamo stator
(1)
As can be known, if omit stator impedance Pressure drop has
(2)
Know by (2) formula, if stator terminal voltage is constant, along with Raise, To reduce.Again by the torque formula
(3)
As can be known, exist Under the identical situation, Reduce to cause the electrical motor output torque to descend, can make the electrical motor stall when serious.Therefore, in Control of Frequency Control Process, should change stator voltage and frequency simultaneously, to keep main flux constant.This is the theoretical foundation place of constant voltage and frequency ratio mode.
Many motors of the present utility model drag the control method of the constant voltage and frequency ratio control system of band conveyor, comprise start-up course, operational process and stopping process, as shown in Figure 5 and Figure 6, provided the program flow diagram of main frame frequency converter and slave frequency converter in the control method of the present utility model respectively;
Described start-up course may further comprise the steps:
A). receive starting-up signal and broadcasting, the main frame frequency converter receives the starting-up signal of this machine or upper computer, and through order wire starting-up signal is broadcast to all slave frequency converters, so that the start of slave frequency converter;
Before startup, the main frame frequency converter judges whether all frequency converters are ready in the system, if all frequency converters are ready, then the main frame frequency converter receives starting-up signal, and all frequency convertor systems start in the apprizing system; If the system failure or frequency converter failure are arranged, the main frame frequency converter does not respond starting-up signal, and system does not allow to start.
B). constant voltage and frequency ratio starts, and the main frame frequency converter is from 0Hz, and according to the pick-up time T1 that sets, gentle acceleration is to the frequency f of setting, according to constant voltage and frequency ratio mode output voltage, to control corresponding motor start-up; The main frame frequency converter is in the process that starts, and constantly running frequency and the active current with self is broadcast to all slave frequency converters by order wire;
In this step, if on the band conveyor load is arranged, main frame frequency converter and slave frequency converter all should increase certain torque magnification, as shown in Figure 1, provided the constant voltage and frequency ratio control VF curve synoptic diagram of band torque magnification, and the setting value of torque magnification want consistent.
As shown in Figure 4, provided constant voltage and frequency ratio frequency conversion speed-adjusting system schematic diagram.
C). the operation of slave frequency converter, the frequency that the slave frequency converter comes the transmission of main frame frequency converter is as the running frequency of self, according to the extremely corresponding electrical motor of the mode output voltage of constant voltage and frequency ratio, so that all AC asynchronous motor are according to the frequency operation of basically identical, execution in step d);
D). whether active current detects, and the slave frequency converter judges that the active current of self output sends and next active current with the main frame frequency converter, in allowed band; If two active currents are in allowed band, then the slave frequency converter keeps current frequency operation; If the difference of two active currents has exceeded allowed band, execution in step e then);
In this step, if the rated current of frequency converter is the M ampere, then described allowed band is meant 0~0.1M ampere, to guarantee the power unanimity or the basically identical of each electrical motor output.In this process, the speed speed that the active current that slave frequency converter response main frame frequency converter is sent is set needs to determine according to field condition; The slave frequency converter responds too fast or crosses and all will cause whole multimachine to drag the belt conveyor system instability slowly, causes the frequency converter protection.
E). by adjusting the frequency of self, the difference that reaches the active current of self output and the active current that main frame sends is in allowed band according to the mode of constant voltage and frequency ratio for the frequency control of slave frequency converter, slave frequency converter;
In the process that the slave frequency converter is regulated, if the active current that the active current of self sends less than the main frame frequency converter, the output that then increases active current by the frequency output that increases self; If the active current of self then reduces the output of active current greater than the active current that the main frame frequency converter sends by the frequency output that reduces self.
F). the main frame frequency converter reaches setpoint frequency f, and the slave frequency converter is followed running frequency, the active current operation of main frame frequency converter, and many motors drag the start-up course of band conveyor and finish;
Described operational process may further comprise the steps:
G). during main frame frequency converter smooth operation, constantly running frequency, the active current with self is broadcast to all slave frequency converters by order wire;
H). the frequency that the slave frequency converter comes the transmission of main frame frequency converter is as the running frequency of self, according to the mode operation of constant voltage and frequency ratio; And judge self active current and the main frame frequency converter send and the active current of coming whether in allowed band; If two active currents are in allowed band, then the slave frequency converter keeps current frequency operation; If the difference of two active currents has exceeded allowed band, execution in step i then);
I). by adjusting the frequency of self, the difference that reaches the active current of self output and the active current that main frame sends is in allowed band according to the mode of constant voltage and frequency ratio for the frequency control of slave frequency converter, slave frequency converter;
Described stopping process may further comprise the steps:
J). receive shutdown signal and broadcasting, the main frame frequency converter receives the shutdown signal of this machine or upper computer, and T2 deceleration time according to setting according to the constant voltage and frequency ratio mode, is decelerated to 0Hz gradually; The main frame frequency converter is in the process of slowing down, and constantly running frequency and the active current with self is broadcast to all slave frequency converters through order wire;
In stopping process, the frequency reducing time should not be provided with too short, and is too short if the frequency reducing time is provided with, and will cause motor to be in generating state, and energy charges to electric capacity by flywheel diode, causes the frequency converter unit overvoltage protection easily.
K). the operation of slave frequency converter, the frequency that the slave frequency converter comes the transmission of main frame frequency converter is as the running frequency of self, according to the extremely corresponding electrical motor of the mode output voltage of constant voltage and frequency ratio, so that all AC asynchronous motor are according to the frequency operation of basically identical, execution in step m);
M). whether active current detects, and the slave frequency converter judges that the active current of self output sends and next active current with the main frame frequency converter, in allowed band; If two active currents are in allowed band, then the slave frequency converter keeps current frequency operation; If the difference of two active currents has exceeded allowed band, execution in step n then);
N). by adjusting the frequency of self, the difference that reaches the active current of self output and the active current that main frame sends is in allowed band according to the mode of constant voltage and frequency ratio for the frequency control of slave frequency converter, slave frequency converter;
O). when main frame frequency converter output frequency arrives 0Hz, block output, and shutdown signal is issued all slave frequency converters by order wire broadcasting, the slave frequency converter blocks output; Many motors drag the band conveyor stopping process and finish.
The utility model adopts the constant voltage and frequency ratio mode, apply voltage according to predefined VF curve to the armature loop that multimachine drags the motor in the belt conveyor system, its characteristic can be equivalent to stable AC voltage source, its stability approaches common frequency power network most, thereby compare with the frequency converter of other mode and other type, have higher working stability and reliability.Simultaneously,, do not enter common frequency power network between the armature loop of motor and frequency converter, therefore reduced requirement, improved the input power factor of system net capacity because the reactive component of current that multimachine drags each motor in the belt feeder system only flows.
Also comprise the emergency protection process, it may further comprise the steps:
1). when running into the system failure or main frame frequency converter and detected communication failure, main frame frequency converter failure, slave frequency converter failure, electric network fault or electrical fault, the main frame frequency converter stops the armature loop power supply to respective motor immediately, notifies each slave frequency converter suddenly to stop simultaneously; After the slave frequency converter receives and suddenly stops order, stop armature loop power supply immediately to respective motor;
2). when the slave frequency converter has detected communication failure or faults itself, can stop armature loop power supply immediately, and inform the main frame frequency converter to respective motor; After the main frame frequency converter receives and informs, stop armature loop power supply immediately, notify all the other each slave frequency converters suddenly to stop simultaneously to respective motor; Remaining slave frequency converter stops the armature loop output voltage to corresponding motor after receiving and suddenly stopping order immediately.
This just makes multimachine drag between each frequency converter in the belt conveyor system is interlocking, as long as there is a frequency converter heavy fault to occur, then total system will be implemented urgency and stop, to avoid the generation of further fault.
Characteristics of the present utility model are: can use constant voltage and frequency ratio controllable type frequency converter to drive multimachine and drag band conveyor, start reposefully, shut down, with higher efficient converting operation; When being in an emergency, protect motor, frequency converter reliably.
The above is specific embodiment of the utility model and the know-why used, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection domain.

Claims (2)

1. motor more than a kind drags the constant voltage and frequency ratio control system of band conveyor, band conveyor is driven by the identical AC asynchronous motor of a plurality of specifications, it is characterized in that: described constant voltage and frequency ratio control system comprises the frequency converter that number equates with the AC asynchronous motor number, wherein a frequency converter is the main frame frequency converter, all the other are the slave frequency converter, and the main frame frequency converter is realized the communication with upper computer; The power input of each frequency converter is connected with electrical network, and power output end is connected with the stator input end of corresponding AC asynchronous motor; Be connected through order wire between main frame frequency converter and the slave frequency converter, every frequency converter all can detect the active current of corresponding AC asynchronous motor.
2. many motors according to claim 1 drag the constant voltage and frequency ratio control system of band conveyor, it is characterized in that: the order wire between main frame frequency converter and the slave frequency converter is an optical fiber communication line.
CN 201320111251 2013-03-12 2013-03-12 Constant voltage frequency ratio control system of belt conveyor driven by a plurality of motors Expired - Fee Related CN203095050U (en)

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103112702A (en) * 2013-03-12 2013-05-22 山东新风光电子科技发展有限公司 Constant voltage frequency ratio control system and constant voltage frequency ratio control method of multi-motor driving belt conveyor
CN103787043A (en) * 2013-08-09 2014-05-14 华能国际电力股份有限公司 Pipe belt conveyor control device and pipe belt conveyor starting and adjusting method
CN104097915A (en) * 2014-07-08 2014-10-15 万宝矿产有限公司 Synchronizing system of multi-transmission rubber belt conveyor
CN104773465A (en) * 2014-01-14 2015-07-15 深圳市汇拓新邦科技有限公司 Large-scale transmission master-slave control equipment of belt conveyer and operation method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103112702A (en) * 2013-03-12 2013-05-22 山东新风光电子科技发展有限公司 Constant voltage frequency ratio control system and constant voltage frequency ratio control method of multi-motor driving belt conveyor
CN103787043A (en) * 2013-08-09 2014-05-14 华能国际电力股份有限公司 Pipe belt conveyor control device and pipe belt conveyor starting and adjusting method
CN104773465A (en) * 2014-01-14 2015-07-15 深圳市汇拓新邦科技有限公司 Large-scale transmission master-slave control equipment of belt conveyer and operation method thereof
CN104097915A (en) * 2014-07-08 2014-10-15 万宝矿产有限公司 Synchronizing system of multi-transmission rubber belt conveyor
CN104097915B (en) * 2014-07-08 2016-03-16 万宝矿产有限公司 Many drive belts machine synchro system

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Address after: 272500 Shandong Province Economic Development Zone Jining City Wenshang County

Patentee after: Shandong Xinfengguang Electronic Technology Development Co., Ltd.

Address before: 272500 Shandong Province Economic Development Zone Jining City Wenshang County

Patentee before: Shandong Xinfeng Photoelectric Science & Technology Development Co., Ltd.

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Owner name: XINFENGGUANG ELECTRONICS TECHNOLOGY CO., LTD.

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Granted publication date: 20130731

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CF01 Termination of patent right due to non-payment of annual fee