CN112953310A - Star-delta dual-power soft starting device for heavy-load starting of conveyor - Google Patents
Star-delta dual-power soft starting device for heavy-load starting of conveyor Download PDFInfo
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- CN112953310A CN112953310A CN202110403632.2A CN202110403632A CN112953310A CN 112953310 A CN112953310 A CN 112953310A CN 202110403632 A CN202110403632 A CN 202110403632A CN 112953310 A CN112953310 A CN 112953310A
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- 230000008569 process Effects 0.000 abstract description 12
- 239000007858 starting material Substances 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/32—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by star/delta switching
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Abstract
The invention relates to a star-delta dual-power soft starting device for heavy load starting of a conveyor, which is called a soft starter for short and comprises a low-voltage power supply, a three-phase power supply, a motor adopting a star-delta connection method, a frequency converter, a delta contactor KM2, a star contactor KM3, a main contactor KM1 and a low-voltage power supply contactor KM 5; the motor is electrically connected with a three-phase power supply through a main contactor KM1, the star contactor KM3 is connected on a connecting line of a triangular contactor KM2 and a motor terminal, and the low-voltage power supply contactor KM5 is electrically connected between the low-voltage power supply and the motor after being connected with a frequency converter in series; the invention can control the belt conveyor to provide gradually increased voltage, so as to start the minimum current required by the motor, stably accelerate the load starting process by limiting current and reducing torque, reduce the dynamic stress born by the belt conveyor in the starting process, prolong the service life of the belt conveyor, and simultaneously weaken the impact of the motor on a power grid in the starting process.
Description
Technical Field
The invention belongs to the technical field of control of a belt conveyor heavy load starting process, and particularly relates to a star-delta dual-power soft starting device for heavy load starting of a conveyor.
Background
The operating regulation of the belt conveyor stipulates that materials loaded on the belt conveyor need to be emptied before the machine is stopped, the starting power of a soft starter is usually selected according to the rated load of the belt conveyor after the materials are emptied, but because the belt conveyor is in the running process, the working conditions of power failure, mechanical failure and the like which need overload starting when the belt conveyor runs in full load often occur, the selected high-pressure soft starter often cannot meet the requirement of overload starting; if a high-voltage soft starter with higher power is directly selected, the cost of equipment is increased, and the power supply capacity is limited.
Chinese patent 201320160997.8 discloses a star-delta smooth start system for a heavy-duty motor, which comprises a stop button SBO, a start button SBl, a time relay KT, a main contactor KM1, a triangular contactor KM2 and a star contactor KM3, wherein the main contactor KM1, the triangular contactor KM2 and the star contactor KM3 are connected in parallel and in phase-staggered connection between three-phase input current and output motor terminals, the star contactor KM3 is connected on a connecting line between the triangular contactor KM2 and the output motor terminals, and a transition contactor KM4 and a series branch of three-phase transition impedance ZL are connected in parallel at two ends of the triangular contactor KM 2. However, when the star-delta starting is adopted, although the star-delta starting has good current characteristics, the torque characteristics are poor, so that the star-delta starting is only objectively suitable for occasions of no-load or light-load starting and is still not suitable for the working condition of restarting on the belt conveyor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a star-delta dual-power soft starting device for heavy load starting of a conveyor, which is used for completing starting under an overload working condition.
The technical scheme of the invention is as follows:
a star-delta dual-power soft starting device for heavy load starting of a conveyor is called a soft starter for short, and comprises a low-voltage power supply, a three-phase power supply, a star-delta connection motor, a frequency converter, a delta contactor KM2, a star contactor KM3, a main contactor KM1 and a low-voltage power supply contactor KM 5; the motor is electrically connected with a three-phase power supply through a main contactor KM1, the star contactor KM3 is connected on a connecting line of the triangular contactor KM2 and a motor terminal, and the low-voltage power supply contactor KM5 is electrically connected between the low-voltage power supply and the motor after being connected with the frequency converter in series.
Further, the star-delta double-power-supply soft starting device for heavy-load starting of the conveyor also comprises a transition impedance ZLAnd a bypass contactor KM4, the bypass contactor KM4 and a transition impedance ZLAfter being connected in parallel, the star contactor KM3 is electrically connected downstream.
Further, the star-delta dual-power soft starting device for heavy load starting of the conveyor further comprises a starting button SBl, a stopping button SBO and a time relay KT1, wherein the frequency converter comprises a frequency converter stopping contact VF, and the stopping button SBO is connected in series on a control power line L; a branch circuit formed by connecting a starting button SB1 and a first normally open contact of a triangular contactor KM2 in parallel is connected in series with a first normally closed contact of a main contactor KM1, a normally closed contact of a time relay KT1 and a coil of the triangular contactor KM2 and then is connected between a control power line L and a ground line N; a second normally open contact of the triangular contactor KM2 is connected in series with a normally closed contact of the star contactor KM3 and a coil of the low-voltage power supply contactor KM5 and then is connected between a control power line L and a ground line N; a parallel branch of a stop contact VF of the frequency converter and a first normally open contact of the star contactor KM3 is connected in series with a coil of a contactor KM3 and then connected between a control power line L and a ground wire N, and a second normally closed contact of a main contactor KM1 is connected in series with a coil of a time relay KT1 and then connected in parallel with two ends of a star contactor coil KM 3; the parallel branch of the normally open contact of the time relay KT1 and the first normally open contact of the main contactor KM1 is connected in series with the normally closed contact of the triangular contactor KM2 and the coil of the main contactor KM1 and then is connected between a control power line L and a ground line N.
Further, a star-triangle dual-power soft starting device for heavy-load starting of a conveyor further comprises a time relay KT2 and a bypass contactor KM4, a normally closed contact of the bypass contactor KM4 and a coil of the time relay KT2 are connected in parallel at two ends of a coil of a main contactor KM1 after being connected in series, and a normally open contact of the time relay KT2 and a parallel branch of a first normally open contact of the bypass contactor KM4 are connected in series between a control power line L and a ground line N after being connected in series with the bypass contactor KM 4.
Further, the star-delta dual-power soft starting device for heavy load starting of the conveyor further comprises an emergency stop knob SA, and the emergency stop knob SA is connected on a control power line L in series.
Further, a second normally open contact of the main contactor KM1 is connected between a three-phase power supply and a motor terminal, a normally open contact of the low-voltage power supply contactor KM5 is connected between a frequency converter and the motor terminal in series, and a second normally open contact of the bypass contactor KM4 is connected in parallel to a transition impedanceZLAt both ends of the same.
Further, the star-delta double-power-supply soft starting device for heavy load starting of the conveyor starts the motor according to the following steps:
firstly, a frequency converter powered by a low-voltage power supply runs a motor in a triangular connection mode at a low speed until materials on a conveyor are unloaded to be empty;
step two, when the motor runs by inertia speed reduction, the motor is switched to a star connection method, and a three-phase power supply is used for starting and is connected in series with a three-phase transition impedance ZLThe motor is started at medium speed after voltage reduction;
and step three, bypassing the transition impedance ZL when the motor runs at a speed close to the rated speed.
Compared with the prior art, the invention has the beneficial effects that:
the invention is used for the starting control of the conveyor, in particular to the control of the carrying restarting process of the belt conveyor, can control the belt conveyor to stably accelerate the carrying starting process according to the gently increasing voltage provided by the soft starter, the minimum current required by the starting motor and the current-limiting torque-reducing, reduces the dynamic stress born by the belt conveyor in the starting process, prolongs the service life of the belt conveyor, and simultaneously can weaken the impact of the motor on a power grid in the starting process.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.
Fig. 2 is a control circuit diagram according to an embodiment of the invention.
In the figure, a main contactor KM1, a triangular contactor KM2, a star contactor KM3, a bypass contactor KM4, a low-voltage power supply contactor KM5, a start button SBl, a time relay KT1, a stop button SBO, a transition impedance ZLThe frequency converter stops the contact VF.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, a star-delta dual-power soft start device for heavy load start of a conveyor, called a soft starter for short, comprises a low-voltage power supply, a three-phase power supply, a star-delta motor, a frequency converter, a delta contactor KM2, a star contactor KM3, a main contactor KMl and a low-voltage power supply contactor KM 5; the motor is electrically connected with a three-phase power supply through a main contactor KM1, the star contactor KM3 is connected on a connecting line of a triangular contactor KM2 and a motor terminal, and the low-voltage power supply contactor KM5 is electrically connected between the low-voltage power supply and the motor after being connected with a frequency converter in series; the voltage provided by the low-voltage power supply and the voltage provided by the three-phase power supply are set according to the rated voltage of the motor; the voltage provided by the three-phase power supply is the rated voltage marked on the motor nameplate and is the voltage when the voltage normally runs; the voltage provided by the low-voltage power supply enables the power supply voltage of the frequency converter to meet the reference voltage when the motor is started under heavy load, and the value of the voltage is below 50% of the rated voltage of the motor.
Further, as shown in fig. 1, the star-delta dual-power soft start device for heavy load start of the conveyor further comprises a transition impedance ZLAnd a bypass contactor KM4, the bypass contactor KM4 and a transition impedance ZLAfter being connected in parallel, the star contactor KM3 is electrically connected downstream.
Specifically, as shown in fig. 1 and fig. 2, the star-delta dual-power soft start device for heavy load start of the conveyor further comprises a start button SB1, an emergency stop knob SA, a stop button SB0, a time relay KT1, a time relay KT2 and a bypass contactor KM4, wherein the frequency converter comprises a frequency converter stop contact VF, and the emergency stop knob SA and the stop button SB0 are connected in series on a control power line L; a branch circuit formed by connecting the start button SBl and a first normally open contact of the triangular contactor KM2 in parallel is connected in series with a first normally closed contact of the main contactor KM1, a normally closed contact of the time relay KT1 and a coil of the triangular contactor KM2 and then is connected between a control power line L and a ground line N; the second normally open contact of the triangular contactor KM2 is connected in series with the normally closed contact of the star contactor KM3 and the coil of the low-voltage power supply contactor KM5Between the control power supply line L and the ground line N; a parallel branch of a stop contact VF of the frequency converter and a first normally open contact of the star contactor KM3 is connected in series with a coil of a contactor KM3 and then connected between a control power line L and a ground wire N, and a second normally closed contact of a main contactor KM1 is connected in series with a coil of a time relay KT1 and then connected in parallel with two ends of a star contactor coil KM 3; a parallel branch of a normally open contact of the time relay KT1 and a first normally open contact of the main contactor KM1 is connected in series with a normally closed contact of the triangular contactor KM2 and a coil of the main contactor KM1 and then connected between a control power line L and a ground wire N, and a normally closed contact of the bypass contactor KM4 and a coil of the time relay KT2 are connected in series and then connected in parallel at two ends of a coil of the main contactor KM 1; a parallel branch of a normally open contact of the time relay KT2 and a first normally open contact of the bypass contactor KM4 is connected in series with the bypass contactor KM4 and then is connected between a control power line L and a ground line N; the second normally open contact of the main contactor KM1 is connected between a three-phase power supply and a motor terminal, the normally open contact of the low-voltage power supply contactor KM5 is connected between a frequency converter and the motor terminal in series, and the second normally open contact of the bypass contactor KM4 is connected in parallel with the transition impedance ZLAt both ends of the same.
The star-delta dual-power soft starting device for heavy load starting of the conveyor realizes reliable and stable starting of the motor, can be applied to occasions of heavy load starting of the motor, stably accelerates the starting process by limiting current and reducing moment according to the minimum current required by the starting motor, reduces the dynamic stress borne by the belt conveyor in the starting process, prolongs the service life of the belt conveyor, has small impact of the motor on a power grid due to the reduction of the starting current, and has the advantages of low manufacturing cost and convenient maintenance.
Further, the star-delta double-power-supply soft starting device for heavy load starting of the conveyor starts the motor according to the following steps:
firstly, a frequency converter powered by a low-voltage power supply runs a motor in a triangular connection mode at a low speed until materials on a conveyor are unloaded to be empty; the rated voltage of the triangle connection motor is reduced by three times, a low-voltage frequency converter with low price is needed to control the motor to output large torque, materials borne by the rubber belt conveyor are unloaded at low speed, the frequency converter exits from circuit connection after the materials are unloaded to be empty, and the time is about one fifth of the rated rotating speed of the motor;
step two, the low-voltage frequency converter is separated from the control circuit, and when the motor runs by inertia speed reduction, the motor is switched into a star connection method, high voltage is input, a three-phase power supply with rated voltage is used for starting the motor connected with a three-phase transition impedance ZL in series, so that the motor is started at a reduced voltage and at a medium speed, and the rest speed starting task of the rated rotating speed of the motor is completed;
step three, the motor runs at a speed close to the rated speed, the transition impedance ZL is bypassed, and the motor runs at the rated power;
the soft starter and the starting steps of the soft starter are suitable for controlling the motor with the rated voltage in a star connection method; the motor can be reliably and stably started by orderly switching the three starting modes, can run for a long time in a low-speed range, is convenient for speed regulation and control, and has the advantages of large starting torque, compact structure, stable operation, small impact on a power grid, low cost and convenient maintenance.
The starting step process:
when a starting button SB1 is pressed, the triangular contactor KM2 is electrified and attracted, the low-voltage power supply contactor KM5 is electrified and attracted, the frequency converter and the low-voltage power supply are switched on, and the motor is started at a low speed by a triangular connection method; after the materials are unloaded to be empty, the frequency converter is withdrawn from the circuit connection, the frequency converter is stopped, the frequency converter stops the closing of a contact VF, the star-shaped connection method is switched, the star contact KM3 is electrified and attracted, the time-delay relay KT1 is electrified and attracted, the main contact KM1 is electrified and attracted, and the three-phase power supply starts the series connection three-phase transition impedance ZLThe motor is started at medium speed after voltage reduction, the time relay KT2 is actuated, the bypass contactor KM4 is energized and actuated, and the control circuit bypasses the transition impedance ZLThe motor completes starting and runs at rated power.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides a star triangle dual supply soft starting device for conveyer heavy load starts which characterized in that: the power supply system comprises a low-voltage power supply, a three-phase power supply, a motor adopting a star-delta connection method, a frequency converter, a delta contactor KM2, a star contactor KM3, a main contactor KM1 and a low-voltage power supply contactor KM 5; the motor is electrically connected with a three-phase power supply through a main contactor KM1, the star contactor KM3 is connected on a connecting line of the triangular contactor KM2 and a motor terminal, and the low-voltage power supply contactor KM5 is electrically connected between the low-voltage power supply and the motor after being connected with the frequency converter in series.
2. The star-delta dual power supply soft start device for heavy load start of a conveyor according to claim 1, wherein: also includes a transition impedance ZLAnd a bypass contactor KM4, the bypass contactor KM4 and a transition impedance ZLAfter being connected in parallel, the star contactor KM3 is electrically connected downstream.
3. The star-delta dual power supply soft start device for heavy load start of a conveyor according to claim 2, wherein: the device also comprises a starting button SB1, a stopping button SB0 and a time relay KT1, wherein the frequency converter comprises a frequency converter stopping contact VF, and the stopping button SB0 is connected in series on a control power line L; a branch circuit formed by connecting a starting button SB1 and a first normally open contact of a triangular contactor KM2 in parallel is connected in series with a first normally closed contact of a main contactor KM1, a normally closed contact of a time relay KT1 and a coil of the triangular contactor KM2 and then is connected between a control power line L and a ground line N; a second normally open contact of the triangular contactor KM2 is connected in series with a normally closed contact of the star contactor KM3 and a coil of the low-voltage power supply contactor KM5 and then is connected between a control power line L and a ground line N; a parallel branch of a stop contact VF of the frequency converter and a first normally open contact of the star contactor KM3 is connected in series with a coil of a contactor KM3 and then connected between a control power line L and a ground wire N, and a second normally closed contact of a main contactor KM1 is connected in series with a coil of a time relay KT1 and then connected in parallel with two ends of a star contactor coil KM 3; the parallel branch of the normally open contact of the time relay KT1 and the first normally open contact of the main contactor KM1 is connected in series with the normally closed contact of the triangular contactor KM2 and the coil of the main contactor KM1 and then is connected between a control power line L and a ground line N.
4. The star-delta dual power supply soft start device for heavy load start of a conveyor according to claim 3, wherein: still include time relay KT2 and bypass contactor KM4, parallelly connected at main contactor KM 1's coil both ends behind bypass contactor KM 4's the normally closed contact and time relay KT 2's the coil series connection, connect between control power line L and ground wire N behind time relay KT 2's the normally open contact and bypass contactor KM 4's the first normally open contact's the parallelly connected branch road series connection bypass contactor KM 4.
5. The star-delta dual power supply soft start device for heavy load start of a conveyor according to claim 3, wherein: the second normally open contact of the main contactor KM1 is connected between a three-phase power supply and a motor terminal, the normally open contact of the low-voltage power supply contactor KM5 is connected between a frequency converter and the motor terminal in series, and the second normally open contact of the bypass contactor KM4 is connected in parallel with the transition impedance ZLAt both ends of the same.
6. The star-delta dual-power soft start device for heavy load start of a conveyor according to claim 2, wherein the star-delta dual-power soft start device for heavy load start of a conveyor starts a motor according to the following steps:
firstly, a frequency converter powered by a low-voltage power supply runs a motor in a triangular connection mode at a low speed until materials on a conveyor are unloaded to be empty;
step two, when the motor runs by inertia speed reduction, the motor is switched to a star connection method, and a three-phase power supply is used for starting and is connected in series with a three-phase transition impedance ZLThe motor is started at medium speed after voltage reduction;
and step three, bypassing the transition impedance ZL when the motor runs at a speed close to the rated speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110403632.2A CN112953310A (en) | 2021-04-14 | 2021-04-14 | Star-delta dual-power soft starting device for heavy-load starting of conveyor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110403632.2A CN112953310A (en) | 2021-04-14 | 2021-04-14 | Star-delta dual-power soft starting device for heavy-load starting of conveyor |
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| CN202110403632.2A Pending CN112953310A (en) | 2021-04-14 | 2021-04-14 | Star-delta dual-power soft starting device for heavy-load starting of conveyor |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE425704C (en) * | 1920-12-31 | 1926-02-25 | Siemens Schuckertwerke G M B H | Circuit for starting three-phase motors using a star-delta connection |
| US20080024087A1 (en) * | 2005-05-13 | 2008-01-31 | Bixel Paul S | System and Method for Starting a Wound Rotor Motor |
| CN202334404U (en) * | 2011-11-23 | 2012-07-11 | 永贵能源开发有限责任公司 | Star type triangular starter of high-power motor |
| CN203180810U (en) * | 2013-04-02 | 2013-09-04 | 山东商务职业学院 | Heavy-duty motor star-delta smooth starting system |
| CN104050855A (en) * | 2014-07-02 | 2014-09-17 | 黄克亚 | Star-delta starting control experiment board based on PLC |
| CN206977334U (en) * | 2017-08-02 | 2018-02-06 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Marine electric machine star-delta starter |
| CN211046803U (en) * | 2019-12-31 | 2020-07-17 | 武汉钇太自动化设备有限公司 | Star-delta voltage reduction starting circuit |
| CN212627740U (en) * | 2020-07-16 | 2021-02-26 | 杭州临江环保热电有限公司 | Control circuit of fluidization fan |
-
2021
- 2021-04-14 CN CN202110403632.2A patent/CN112953310A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE425704C (en) * | 1920-12-31 | 1926-02-25 | Siemens Schuckertwerke G M B H | Circuit for starting three-phase motors using a star-delta connection |
| US20080024087A1 (en) * | 2005-05-13 | 2008-01-31 | Bixel Paul S | System and Method for Starting a Wound Rotor Motor |
| CN202334404U (en) * | 2011-11-23 | 2012-07-11 | 永贵能源开发有限责任公司 | Star type triangular starter of high-power motor |
| CN203180810U (en) * | 2013-04-02 | 2013-09-04 | 山东商务职业学院 | Heavy-duty motor star-delta smooth starting system |
| CN104050855A (en) * | 2014-07-02 | 2014-09-17 | 黄克亚 | Star-delta starting control experiment board based on PLC |
| CN206977334U (en) * | 2017-08-02 | 2018-02-06 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Marine electric machine star-delta starter |
| CN211046803U (en) * | 2019-12-31 | 2020-07-17 | 武汉钇太自动化设备有限公司 | Star-delta voltage reduction starting circuit |
| CN212627740U (en) * | 2020-07-16 | 2021-02-26 | 杭州临江环保热电有限公司 | Control circuit of fluidization fan |
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