CN108599670A - Speed regulation control method for special frequency converter for heavy-load motor - Google Patents
Speed regulation control method for special frequency converter for heavy-load motor Download PDFInfo
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- CN108599670A CN108599670A CN201810426050.4A CN201810426050A CN108599670A CN 108599670 A CN108599670 A CN 108599670A CN 201810426050 A CN201810426050 A CN 201810426050A CN 108599670 A CN108599670 A CN 108599670A
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- Prior art keywords
- load
- frequency converter
- current
- brake
- motor
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Classifications
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- 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
- H02P27/06—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 using dc to ac converters or inverters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
Abstract
The invention discloses a speed regulation control method of a special frequency converter for a heavy load motor, which is characterized in that a load overshoot monitoring circuit is added in a driving circuit and is controlled by a single chip microcomputer, when load overshoot is monitored, the single chip microcomputer responds to drive an IGBT module to prevent the motor from reversing when a large load is judged by monitoring the load current and the phase, in the process, the large current is output, the single chip microcomputer outputs a load starting signal and a protection control signal to the IGBT module, and a load starting program for preventing slipping hooks and a protection program for preventing the IGBT module from being burnt out are started. The working condition of the point-operated lifting slide hook is avoided, another rectifying power supply for the brake coil to work is not needed to be controlled by a switch port of the frequency converter, only the output line of the frequency converter controller is connected with a rectifying bridge in parallel, the direct-current wiring coil works synchronously, a driving circuit is simplified, and the side effect of brake abrasion caused by the original method that the lifting motor is started first and then the brake is released is reduced.
Description
Technical field
The present invention relates to heavy duty motor Special variable frequency speed regulation schemes, for operating modes such as lifting, lifting and elevators.
Background technology
Application effect of the frequency control on crane is very notable, but there is also deficiencies on lifting is applied.Domestic ring
Chain block special converter there is no applicable product.Motor special governor can could meet demand of specialty.
1, universal frequency converter is applied upper defective in lifting
Crane will often carry out crawl and (also cry when mold positions, lifting workpiece to be processed is to operating modes such as lathe stations
Adjusting microinching) operation.It is to carry out occurring when crawl operation when heavy load workpiece needs precise positioning to slip hook phenomenon very much, especially in moment
It is easy to happen when crawl raising.Its endanger be then gently position it is more difficult, it is heavy then injure lathe by a crashing object or workpiece of damaging.
Slipping hook situation under normal circumstances, in the case of underloading in the machinery part of brake will not occur, and only occur when overloaded.
Such case is because there is the universal frequency converter of heavily loaded ability still to have deficiency in lifting operating mode at present.
Start when weight is hung in hovering, when crawl operates raising, the one of brake is opened under brake coil effect
If the starting current that moment starts motor is not sufficiently large and loads larger or close under will will produce rapidly when nominal load
It is sliding, that is, slip hook.
Current all manufacturers are all with setting brake when controlling braking motor in the practical lifting control application of frequency converter
Coil startup time lag prevents from slipping hook phenomenon in the mode of motor starting time, i.e., after first starting hoisting motor, unclamps again
Brake.(note：It is alternating current generator, its restraining coil with brake is direct current to rise and reuse braking motor, and coil unclamps when being powered
Braking)
This mode will use the switch terminal interface of universal frequency converter, and brake coil lag time ginseng is arranged in frequency converter
Number controls the rectification circuit installed outside frequency converter to control brake coil (brake coil by frequency converter switch terminal interface
For DC coil) the startup time.This setting brake coil starts the mode of time lag in practical operation, to ensure
Hook is not slipped, is respectively provided with partially late.In fact the best lag time of science can not be also determined.Specifically, operating each time is all
Start motor under braking state.Therefore, hook method is slipped while preventing from slipping hook phenomenon using this control, bring brake
Wear faster side effect.
Current middle or small tonnage grade crane much uses the conical rotor machine of mature and reliable, and conical rotor machine does not have
There is brake coil.Therefore, their this control modes can not use, and when thereby resulting in the crawl raising under case of heavy load, have
Under slip situation.Crane user can only avoid such operating mode as possible.The change of the commercial third gear bigger than controlled motor of crane production
Frequency device reduces heavy duty and slips hook phenomenon (2.2kw bridge motor 7.5kw frequency converters).
2, domestic ring-chain hoist special converter blank
After ring-chain hoist control panel (no matter non-frequency contactor or frequency converter dual-speed control) is installed in ring-chain hoist
In portion's shell, it is enclosed in compact small space.
Oneself upgrades through starting for current a small number of domestic ring-chain hoist production firms, produces frequency conversion double speed ring-chain hoist.
There is ring-chain hoist dealer to transform non-frequency contactor control single speed ring-chain hoist as frequency conversion double speed loop chain calabash in sales section
Reed.All using universal frequency converter in practice, universal frequency converter is mounted on closed and closely small space,
It is less use and operating mode in short-term due to there are many ring-chain hoist terminal users, is that can use in this case
's.But when summer temperature is high, or using it is frequent when due to that can not radiate, i.e., can overheat report and stop or burn.And not
It can be detected by industry.
According to JB/T12989-2016 hoisting machineries frequency converter standard, wherein adjusting microinching standard is as follows：
" the motor adjusting microinching of 6.2.2.3 band brake logics, after receiving adjusting microinching instruction, frequency converter should be able to be according to setting
Value is started, runs and is stopped by given running frequency and time automatically.Brake should be able to be in frequency converter in the process
It controls lower normal release, close, well ensures that steady, the nothing of hoisting machinery start-stop process slip hook, without unusual fluctuation.”
It is all to be manufactured and installed and used by the method for the above standard requirement, that is, first start electricity to play reuse frequency converter at present
Machine, rear releasing of brake.It can accomplish that steady nothing slips hook, but being seriously worn for brake block will necessarily be caused.
The present invention is not from the motor braking direction of band brake logic, that is, does not study the time point of delay releasing of brake,
The wear-resisting direction of brake block is not studied to solve heavily loaded adjusting microinching, but innovatively by Frequency Converter Control, in controlled motor skill yet
Transient current and short-time current are increased substantially within the scope of art, solving load adjusting microinching, steadily nothing slips hook phenomenon.Rather than pass through system
The given first startup motor of dynamic logic, the time control of rear releasing of brake.
Invention content
The object of the present invention is to provide a kind of heavy duty motor special converter method for controlling speed regulation, it is ensured that load adjusting microinching is flat
Surely, nothing slips hook, without unusual fluctuation phenomenon.
Current all manufacturers are all with setting brake when controlling braking motor in the practical lifting control application of frequency converter
Coil startup time lag prevents from slipping hook phenomenon in the mode of motor starting time, i.e., after first starting hoisting motor, unclamps again
Brake.(note：It is alternating current generator, its restraining coil with brake is direct current to rise and reuse braking motor, and coil unclamps when being powered
Braking)
This mode will use the switch terminal interface of universal frequency converter, and brake coil lag time ginseng is arranged in frequency converter
Number controls the rectification circuit installed outside frequency converter to control brake coil (brake coil by frequency converter switch terminal interface
For DC coil) the startup time.This setting brake coil starts the mode of time lag in practical operation, to ensure
Hook is not slipped, is respectively provided with partially late.In fact the best lag time of science can not be also determined.Specifically, operating each time is all
Start under braking state.Therefore, hook method is slipped while preventing from slipping hook phenomenon using this control, bring brake abrasion
Faster side effect.
Current middle or small tonnage grade crane much uses the conical rotor machine of mature and reliable, and conical rotor machine does not have
There is brake coil.Therefore, their this control modes can not use, and when thereby resulting in crawl raising in load conditions, have
Under slip situation.Crane user can only avoid such operating mode as possible.The change of the commercial third gear bigger than controlled motor of crane production
Frequency device reduces load and slips hook phenomenon (2.2kw bridge motor 7.5kw frequency converters).
After ring-chain hoist control panel (no matter non-frequency contactor or dual-speed control frequency converter) is installed in ring-chain hoist
In portion's shell, it is enclosed in compact small space.
The radiator of universal frequency converter is mounted in ring-chain hoist aft case, some housing bottoms have sheet iron, is to use
It reinforces, is not connected with radiator.Fully rely on the fan in shell and radiator cooling.Since shell is the bad of temperature
Conductor, frequency converter are enclosed in compact small space, and the high temperature for the generation that works can not shed.
The technical scheme is that：A kind of heavy duty motor special converter method for controlling speed regulation, characterized in that control
The driving circuit installed outside frequency converter increases load in the driving circuit to control the time of the lag startup of brake coil
Observation circuit is overshooted, is controlled by microcontroller, improves that electric motor starting is instantaneous and short-term operation electric current by a relatively large margin, is solved in this approach
Hook phenomenon is slipped in heavy duty, and then maintains normal condition when load running；When monitoring load overshoot, by load current and phase
When the monitoring of position is judged to have big load, microcontroller makes a response, and driving IGBT module prevents motor reversal, in this process
In, big electric current output is had, microcontroller will load enabling signal and protection control signal is output to IGBT module, and startup prevents
It slips the load startup program of hook and prevents from burning out the protective program of IGBT module；It is 2.5S that motor starts minimum time twice, short
When be 0.8S, short-time current is 7 times of rated current, and transient current is 12 times of rated current.
The present invention only by frequency-variable controller output line and need to connect rectifier bridge, and direct current is connect brake coil, make electric motor starting with
Releasing of brake works asynchronously.
The radiator of frequency converter of the present invention is mounted in ring-chain hoist aft case, using heating element mounting surface and change
The radiator of frequency device mounting surface one distributes heat by mounting surface by ring-chain hoist casing metal.
The hardware characteristics of the present invention program are：
1, operating mode that crawl raising slips hook is avoided simultaneously, another confession that need not be controlled by frequency converter switch port
The rectifier power source of brake coil work；Only by frequency-variable controller output line and rectifier bridge need to be connect, direct current wiring circle is made to synchronize work
Make, simplify driving circuit, while after subtracting because first starting hoisting motor, unclamps again the brake abrasion that the original method of brake is brought
Side effect.
2, it is integrated radiator that heat spreader structures, which are smooth frequency converter mounting surface and heating element mounting surface,.Fastening
On ring-chain hoist back casing or metal mounting surface, (such as not smooth enough, can to fill out heat-conducting silicone grease etc.) can also install fan simultaneously,
Fan main function is that radiator heat source is made uniformly to flow to frequency-variable controller mounting surface.
3, inventive can be stablized, and installation is simple and convenient, and synchronous control restraining coil does not have to other rectification circuit, subtracts
After first starting hoisting motor, the brake abrasion that the original method of brake is brought is unclamped again, cost is saved, reduces space, make
It is higher than JB/T12989-2016 hoisting machineries frequency converter standard with effect.
Description of the drawings
Fig. 1 (1) is circuit diagram of the present invention.
Fig. 1 (2) is invention software flow chart.
Fig. 1 (3) is that the present invention starts control schematic diagram.
Fig. 2 (1) is the control for brake schematic diagram of current crane practical application.
Fig. 2 (2) is the control for brake schematic diagram of the present invention program.
Fig. 3 (1) is one of heat spreader structures schematic diagram of the present invention.
Fig. 3 (2) is the two of heat spreader structures schematic diagram of the present invention.
It is 1., 2., 3. heating device mounting surface in figure, is 4. frequency converter mounting surface, mounting hole 5. is installed for frequency converter.
Specific implementation mode
The content of present invention is described in further details below in conjunction with attached drawing
It is appropriate in part such as power device IGBT capacitances, rectifier bridge selection as shown in Fig. 1 (1), Fig. 1 (2), Fig. 1 (3)
Parameter improves 25% or more parameter, such as by power device rectifier bridge, IGBT and capacitance on the basis of normal design：2.2kw becoming
Frequency device normal design rectifier bridge 25A is changed to 35A, and IGBT is changed to 25A by normal design 15A；Storage capacitor is used by normal design
680uf is changed to 1000uf.Increase load overshoot observation circuit in driving circuit, is controlled by microcontroller, improve electricity by a relatively large margin
Machine starts instantaneous and short-term operation electric current, solves heavy duty in this approach and slips hook phenomenon, and then maintains normal condition when load running.
When monitoring load overshoot, when by judging to have big load to the monitoring of load current and phase, monolithic
Machine makes a response, and driving IGBT prevents motor reversal.In this course, big electric current output is had.It is instantaneous and short to provide
When overload current and prevent the output of high current to the damage of IGBT module, CPU, which can pass through, loads enabling signal and protection control
Signal is output to IGBT module, and making driving or protection response, startup prevents from slipping the load startup program of hook or prevent from burning out
The protective program of IGBT module.It is 2.5S to start minimum time twice, is in short-term 0.8S, and short-time current is 7 times of rated current,
Transient current is 12 times of rated current.
As shown in Fig. 2 (1), the control braking time lag method of current crane practical application：(become by individual power supply
Depressor) provide 36v exchange controlled by frequency converter program setting through frequency converter switch port, carry out take-off the brake after startup motor
Lag time control.The controlled motor starting time that lags behind of direct current is set to connect restraining coil again by relay.(relay or
Contactor coil is exchange 36v, and contact control 380v direct currents connect restraining coil)
As shown in Fig. 2 (2), frequency converter output line simultaneously connects a rectifier bridge, and direct current connects restraining coil, it is ensured that start motor with
Take-off the brake synchronizes.Driving circuit is simplified, while being subtracted because first starting motor, pad wear is braked caused by rear take-off the brake.
1., 2., 3. the radiator that can have variously-shaped design is heating device in figure as shown in Fig. 3 (1), Fig. 3 (2)
4. mounting surface is frequency converter mounting surface, 5. install mounting hole for frequency converter.Heat spreader structures of the present invention are that smooth frequency converter is pacified
Dress face and heating element mounting surface (can be smooth can also be out-of-flatness) be integrated radiators, pass through metal fever
Conduction is transmitted and is distributed towards the metals such as body or metal chassis by frequency converter installation.
The above is only the preferred embodiment of the present invention, not does any restrictions to the present invention, every according to hair
Bright technical spirit changes any simple modification, change and equivalent structure made by above example, still falls within the present invention
In the protection domain of technical solution.
Claims (3)
1. a kind of heavy duty motor special converter method for controlling speed regulation, characterized in that the driving that control is installed outside frequency converter
Circuit come control brake coil lag start time, in the driving circuit, increase load overshoot observation circuit, by microcontroller
Control, improves that electric motor starting is instantaneous and short-term operation electric current by a relatively large margin, solves heavy duty in this approach and slips hook phenomenon, and loads fortune
Then maintains normal condition when row；It is big by judging to have to the monitoring of load current and phase when monitoring load overshoot
When load, microcontroller makes a response, and driving IGBT module prevents motor reversal, in this course, has big electric current output,
Microcontroller will load enabling signal and protection control signal is output to IGBT module, start the load startup program for preventing from slipping hook and
Prevent from burning out the protective program of IGBT module；It is 2.5S that motor starts minimum time twice, is in short-term 0.8S, short-time current is volume
7 times of constant current, transient current are 12 times of rated current.
2. heavy duty motor special converter method for controlling speed regulation as described in claim 1, characterized in that only need to be by frequency conversion control
Device output line processed simultaneously connects rectifier bridge, and direct current is connect brake coil, electric motor starting is made to work asynchronously with releasing of brake.
3. heavy duty motor special converter method for controlling speed regulation as described in claim 1, characterized in that the heat dissipation of frequency converter
Device is mounted in ring-chain hoist aft case, using the radiator of heating element mounting surface and frequency converter mounting surface one, by
Mounting surface distributes heat by ring-chain hoist casing metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810426050.4A CN108599670B (en) | 2018-05-07 | 2018-05-07 | Speed regulation control method for special frequency converter for heavy-load motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810426050.4A CN108599670B (en) | 2018-05-07 | 2018-05-07 | Speed regulation control method for special frequency converter for heavy-load motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108599670A true CN108599670A (en) | 2018-09-28 |
| CN108599670B CN108599670B (en) | 2019-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810426050.4A Active CN108599670B (en) | 2018-05-07 | 2018-05-07 | Speed regulation control method for special frequency converter for heavy-load motor |
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Citations (6)
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|---|---|---|---|---|
| CN101388640A (en) * | 2008-07-11 | 2009-03-18 | 上海智大电子有限公司 | Pressure and speed regulating system for semi-digital AC stator |
| CN201294470Y (en) * | 2008-11-06 | 2009-08-19 | 乌鲁木齐希望电子有限公司 | Phase control intelligent electricity-saving controller for three-phase asynchronous motor |
| CN101691192A (en) * | 2009-09-24 | 2010-04-07 | 青岛立邦达工控技术有限公司 | Method for controlling torque of heavy-duty crane at zero speed |
| CN105048414A (en) * | 2015-07-29 | 2015-11-11 | 中国科学院长春光学精密机械与物理研究所 | IGBT (Insulated Gate Bipolar Transistor) protection circuit and protection method in stepping motor driver |
| CN106816854A (en) * | 2015-11-27 | 2017-06-09 | 沈阳高精数控智能技术股份有限公司 | A kind of excessively stream cascade protection method of response servo-drive high |
| CN107094007A (en) * | 2017-03-08 | 2017-08-25 | 全球能源互联网研究院 | A kind of IGBT over-current protection methods and device |
-
2018
- 2018-05-07 CN CN201810426050.4A patent/CN108599670B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388640A (en) * | 2008-07-11 | 2009-03-18 | 上海智大电子有限公司 | Pressure and speed regulating system for semi-digital AC stator |
| CN201294470Y (en) * | 2008-11-06 | 2009-08-19 | 乌鲁木齐希望电子有限公司 | Phase control intelligent electricity-saving controller for three-phase asynchronous motor |
| CN101691192A (en) * | 2009-09-24 | 2010-04-07 | 青岛立邦达工控技术有限公司 | Method for controlling torque of heavy-duty crane at zero speed |
| CN105048414A (en) * | 2015-07-29 | 2015-11-11 | 中国科学院长春光学精密机械与物理研究所 | IGBT (Insulated Gate Bipolar Transistor) protection circuit and protection method in stepping motor driver |
| CN106816854A (en) * | 2015-11-27 | 2017-06-09 | 沈阳高精数控智能技术股份有限公司 | A kind of excessively stream cascade protection method of response servo-drive high |
| CN107094007A (en) * | 2017-03-08 | 2017-08-25 | 全球能源互联网研究院 | A kind of IGBT over-current protection methods and device |
Non-Patent Citations (1)
| Title |
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| 徐立芳: "《工业自动化系统与技术》", 31 August 2014 * |
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| CN108599670B (en) | 2019-07-23 |
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Effective date of registration: 20200116 Address after: 210000, Jiangsu province Nanjing Lishui District Yong Yang Street, Tianshengqiao Road, No. 688 Patentee after: Nanjing Zhuyuan Electronic Technology Co., Ltd Address before: 710077 No. five, No. five, Hua Hua Zhai street, Yanta District, Xi'an, Shaanxi Patentee before: Meng Xiaoli |
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Effective date of registration: 20220513 Address after: 214145 204, building D, information industry science and Technology Park, No. 21, Changjiang Road, Xinwu District, Wuxi City, Jiangsu Province Patentee after: Wuxi Zhongqi Electronic Technology Co.,Ltd. Address before: 210000 Tianshengqiao Avenue 688, Yongyang Street, Lishui District, Nanjing City, Jiangsu Province Patentee before: Nanjing Zhuyuan Electronic Technology Co.,Ltd. |