CN105634337A - Current setting-based AC motor decompression starting device and method - Google Patents
Current setting-based AC motor decompression starting device and method Download PDFInfo
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- CN105634337A CN105634337A CN201610060352.5A CN201610060352A CN105634337A CN 105634337 A CN105634337 A CN 105634337A CN 201610060352 A CN201610060352 A CN 201610060352A CN 105634337 A CN105634337 A CN 105634337A
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- 230000006837 decompression Effects 0.000 title abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 45
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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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- Motor And Converter Starters (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention provides a current setting-based AC motor decompression starting device, which mainly comprises a current transformer, three decimal BCD dial switches and a controller, wherein a power line for supplying electricity to an AC motor passes through a primary winding of the current transformer; an output end of a secondary winding of the current transformer is connected to a current detection port of the controller; the three decimal BCD dial switches are connected to a corresponding current setting port of the controller respectively, and are used for setting the current during Y-delta starting of the AC motor; an output port of the controller is connected to a Y-delta conversion circuit of the AC motor; and an external starting/stopping signal of the AC motor is input unto the corresponding input port of the controller. The invention further provides a method for the current setting-based AC motor decompression starting device. The decompression starting process of the AC motor is stable and free of an impact; and the starting safety of the motor is ensured.
Description
Technical field
The invention belongs to alternating current generator technical field, be specifically related to the alternating current generator pressure-reduction starting device based on current settings and the method for a kind of alternating current generator decompression smooth starting for middle low power.
Background technology
AC induction motor is widely used in the every field of industrial and agricultural production. At present, the starting method of alternating current generator is a lot, and high-power AC motor generally adopts the methods such as soft initiator, rotor string resistance, the rotor string quick reactor of frequency. And the startup major part of middle small machine adopts the method such as Y-�� decompression starting, stator string reactance.
Traditional Y-�� decompression starting is to adopt the conversion that motor stator winding is carried out Y (star) by the method for timing and �� (triangle) couples. Vary in size owing to motor institute is load-carrying, start the required time different in size, if start motor when load is bigger, traditional timing Y-�� startup can cause motor just to carry out Y-�� conversion under larger current, so load can be caused bigger impact, shortening the service life of motor, time serious, meeting motor damage, does not reach the flattening effect of decompression starting.
Summary of the invention
The technical problem to be solved is to provide a kind of alternating current generator pressure-reduction starting device based on current settings and method, it is possible to realizes stator winding Y connection in Y-�� start-up course and, to the smooth conversion of �� connection, ensures the startup safety of motor simultaneously.
In order to solve above-mentioned technical problem, the present invention provides a kind of alternating current generator pressure-reduction starting device based on current settings, is mainly made up of current transformer, three decimal scale BCD toggle switch and controller; Wherein, a winding of a power line described current transformer of traverse powered to alternating current generator, the Secondary Winding outfan of described current transformer connects the current detecting port of described controller; Three decimal scale BCD toggle switch are respectively connecting to the current settings port that described controller is corresponding, and electric current during for the Y-�� of described alternating current generator is started is set; The output port of described controller connects the Y-�� change-over circuit of alternating current generator, the corresponding input port of the outside startup/stop signal input extremely described controller of described alternating current generator.
Further, after the Secondary Winding outfan of described current transformer is sequentially connected with single phase bridge type rectifier circu, filter circuit, potential regulator and analog to digital conversion circuit, it is connected to the current detecting port of described controller.
Further, described current transformer is fixed on the mounting rail of described alternating current generator by screw and an installing rack.
Further, described controller is AT89C52 series monolithic controller.
Further, each BCD toggle switch has 5 pins: 8,4,2,1 and A, A be common port, connect+5V power supply, the numeral on BCD toggle switch from 0 change to 9 time, 8,4,2,1 pin will export corresponding level.
Further, described Y-�� change-over circuit is mainly made up of two relay K 1 and K2, relay K 1 and K2 coil connect the corresponding output port of described controller respectively, outside startup/the stop signal of described alternating current generator is respectively through catalyst KM1, the input port of the contact input extremely described controller of KM2, and when the closing of contact of catalyst KM1, the input port of the controller that this contact connects is high level, the output port of the controller that relay K 1 coil connects is high level, relay K 1 is charged, the stator winding of the auxiliary contact control alternating current generator of relay K 1 is connected into Y shape and starts, when the starting current of alternating current generator reaches the electric current that described three decimal scale BCD toggle switch set, the output port output low level of the controller that relay K 1 coil connects, relay K 1 dead electricity, the output port output high level of the controller that relay K 2 coil connects, relay K 2 is charged, the auxiliary contact of relay K 2 controls the stator winding of alternating current generator and is converted to the connection of �� shape by Y shape connection, and startup terminates, when the closing of contact of catalyst KM2, the input port of the controller that this contact connects is high level, and the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current generator shuts down.
Further, described Y-�� change-over circuit also includes display lamp, and described display lamp is connected to the display lamp of described controller and controls port, and when the stator winding of described alternating current generator is connected into Y shape startup, described display lamp controls port output high level, the charged instruction of display lamp; When the stator winding of described alternating current generator is transferred to the connection of �� shape by Y shape connection, described display lamp controls port output low level, and display lamp dead electricity is extinguished.
The present invention provides a kind of method of above-mentioned alternating current generator pressure-reduction starting device based on current settings, including:
The external start signal of alternating current generator is received by the corresponding input port of controller;
By the starting current of current transformer detection stator in described alternating current generator start-up course, and set the electric current when Y-�� of described alternating current generators starts by three decimal scale BCD toggle switch;
The starting current that described controller detects according to electric current and the described current transformer of described three decimal scale BCD toggle switch setting, the Y-�� startup conversion of described alternating current generator is controlled, make the stator winding of described alternating current generator be connected into Y shape when starting to start, when the starting current of described alternating current generator reaches the electric current of described setting, be converted to �� shape followed by the stator winding controlling described alternating current generator by Y shape connection to couple, terminate Y-�� and start.
Further, described Y-�� change-over circuit is mainly made up of two relay K 1 and K2, when external start signal received by controller, the closing of contact of catalyst KM1, the output port of the controller that relay K 1 coil connects is high level, relay K 1 is charged, and the stator winding of the auxiliary contact control alternating current generator of relay K 1 is connected into Y shape and starts; When the starting current of alternating current generator reaches the electric current of described setting, the output port output low level of the controller that relay K 1 coil connects, relay K 1 dead electricity, the output port output high level of the controller that relay K 2 coil connects, relay K 2 is charged, the auxiliary contact of relay K 2 controls the stator winding of alternating current generator and is converted to the connection of �� shape by Y shape connection, and startup terminates.
Further, when outside stop signal received by controller, the closing of contact of catalyst KM2, the input port of the controller that this contact connects is high level, the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current generator shuts down.
Compared with prior art, technical scheme has the advantages that
1, the alternating current generator pressure-reduction starting device based on current settings of the present invention, simple in construction, cost is low, coordinated by current transformer, controller and three decimal scale BCD toggle switch, realizing in alternating current generator Y-�� start-up course its stator winding from Y connection to the smooth conversion of �� connection, electric motor starting runs safety.
2, the method for the exchange pressure-reduction starting device based on current settings of the present invention, Y-�� start-up course is measured the starting current of Stator Windings of AC Motor by current transformer, and when the electric current that the starting current of motor sets close to three decimal scale BCD toggle switch, controller is made to send Y-�� conversion signal, Y connection when being started by stator winding converts �� connection to, terminate Y-�� to start, so that the decompression starting process of alternating current generator is steady, nothing is impacted, it is ensured that the startup safety of motor.
Accompanying drawing explanation
Fig. 1 is the structural representation of the exchange pressure-reduction starting device based on current settings of the specific embodiment of the invention;
Fig. 2 is the scheme of installation of the current transformer in the exchange pressure-reduction starting device of the specific embodiment of the invention;
Fig. 3 is the circuit structure diagram of the exchange pressure-reduction starting device based on current settings of the specific embodiment of the invention.
Detailed description of the invention
It is described in further detail below in conjunction with the accompanying drawing a kind of exchange pressure-reduction starting device based on current settings to the present invention and method.
As it is shown in figure 1, the present invention provides a kind of alternating current generator pressure-reduction starting device based on current settings, mainly it is made up of 20, three decimal scale BCD toggle switch 26 of current transformer and controller 25; Wherein, to a winding of a power line described current transformer 20 of traverse of the power supply of alternating current generator 11 power supply, the Secondary Winding outfan of described current transformer 20 connects the current detecting port of described controller; Three decimal scale BCD toggle switch 26 are respectively connecting to the current settings port of described controller 25 correspondence, and electric current during for the Y-�� of described alternating current generator 11 is started is set; The output port of described controller 25 connects the Y-�� change-over circuit 12 of alternating current generator 11, the corresponding input port of the outside startup/stop signal input extremely described controller 25 of described alternating current generator 11.
Refer to Fig. 2 and Fig. 3, in the present embodiment, in order to be able to the line current making current transformer 20 be accurately detected when alternating current generator 11 runs, and make Y-�� change-over circuit 12 change by the electric current set, be embodied as according to the following steps:
1. press shown in accompanying drawing 2, a winding by power line 100 traverse current transformer 20, current transformer 20 is by installing rack 111 and is fixed on the mounting rail 110 of alternating current generator 11 with screw 112, and the Secondary Winding of current transformer 20 is its current value detected.
2. refer to Fig. 1 and Fig. 3, the 3 of Secondary Winding side of current transformer 20, No. 4 ends are pressed shown in Fig. 3 and be connected with the 1 of single phase bridge type rectifier circu 21, No. 2 ends respectively, the 3 of single phase bridge type rectifier circu 21, No. 4 ends are sequentially connected with the two ends of the two ends of filter circuit 22, potential regulator 23 respectively, and the outfan of potential regulator 23 connects the input of analog to digital conversion circuit 25. in the present embodiment, filter circuit 22 is mainly made up of filter capacitor C, the 3 of single phase bridge type rectifier circu 21, No. 4 ends are in parallel with filter capacitor 22, potential regulator 23 is by resistance R1, adjustable rheostat RP, resistance R3 is sequentially connected in series and forms, analog to digital conversion circuit 25 is ADC0804 modulus conversion chip, the adjustable side 5 of the adjustable rheostat RP of potential regulator 23 connect ADC0804 modulus conversion chip Vin (+) end, the Vin of resistance R3 and ADC0804 modulus conversion chip (-) end connects and ground connection, the power end VCC of ADC0804 modulus conversion chip connects+5V power supply. the rated value of the Secondary Winding side output electric current of described current transformer 20 is 0.1A, regulate the adjustable rheostat RP of potential regulator 23, can so that current transformer 20 be through the bridge rectifier of single phase bridge type rectifier circu 21, the DC voltage being input to analog to digital conversion circuit after filter circuit 22 filtering is 0-5V, 1.2 times of the rated current of 5V correspondence alternating current generator 11, namely when alternating current generator 11 is in specified running status, the DC voltage of corresponding 4.17V, namely when the electric current of the Secondary Winding side of current transformer 20 is 0.1A, the voltage of No. 5 outfans of adjustable rheostat RP is 4.17V.
3. refer to Fig. 1 and Fig. 3, controller 25 adopts AT89C52 series monolithic controller, and the output port of the DB0-DB7 of ADC0804 modulus conversion chip connects the P3.0-P3.7 port of AT89C52 series monolithic controller. Before carrying out alternating current generator 11 and starting, the Y-�� manually being arranged alternating current generator by three decimal scale BCD toggle switch 26 in accompanying drawing 3 starts the electric current changed, usual switching current is set as about the 80% of Rated motor electric current, three BCD toggle switch 1,2,3 represent-hundred, the individual position setting electric current respectively, the electric current to hundred during the Y-�� startup of alternating current generator 11 can be set, meet the needs of the electric current of various medium and small alternating current generator. Three decimal scale BCD toggle switch 26 are connected with P0.0-P0.3, P0.4-P0.7 port of AT89C52 series monolithic controller and P1.0-P1.3 port respectively. Each BCD toggle switch has 5 pins, they be respectively 8,4,2,1 and A, A be common port, connect+5V power supply, the numeral on toggle switch from 0 change to 9 time, 8421 pins will export corresponding level, such as when BCD toggle switch dial be 1 time, 1 pin and public control end A connect; When dial be 3 time, 1 connects with 2 pins and public control end A, and thus each BCD toggle switch is output as 8421 yards.
4. the actual starting current of the alternating current generator 11 that controller 25 detects according to the electric current summation current transformer 20 that three decimal scale BCD toggle switch 26 set, the Y-�� change-over circuit 12 that alternating current generator 11 is started is controlled. wherein, Y-�� change-over circuit 12 is by two relay K 1, K2 and display lamp H1 is formed, No. 2 ends of the coil of relay K 1 and K2 are connected to P2.5 and the P2.6 port of AT89C52 series monolithic controller, No. 4 ends of No. 2 ends of catalyst KM1 contact (the outside of corresponding alternating current generator starts control signal) and catalyst KM2 contact (outside corresponding to alternating current generator stops control signal) are connected to P2.1 and the P2.2 port of AT89C52 series monolithic controller, the common port 1 of the outside startup/stop signal of alternating current generator 11 is connected with+5V power supply. for indicating the display lamp H1 of the Y-�� start-up course of alternating current generator 11, it is connected to the P2.4 port of AT89C52 series monolithic controller. thus, when controller 25 is when receiving external start signal, the catalyst KM1 closing of contact, the P2.1 port of controller 25 is high level, P2.5 port output high level, and relay K 1 is charged, the stator winding of its auxiliary contact control alternating current generator 11 is connected into Y shape and starts, meanwhile, P2.4 port output high level, the charged instruction of display lamp H1, when the starting current of alternating current generator 11 reaches the electric current that BCD toggle switch 26 sets, P2.5 port output low level, relay K 1 dead electricity, P2.6 port time delay certain time (such as 0.5 second) exports high level afterwards, and relay K 2 is charged, and its auxiliary contact controls the stator winding of alternating current generator 11 and is converted to the connection of �� shape by Y shape connection, startup terminates, alternating current generator 11 operates under �� shape connecting mode, P2.4 port output low level, and display lamp H1 dead electricity is extinguished, when outside stop signal received by controller 25, the catalyst KM2 closing of contact, P2.2 port is high level, P2.6 port output low level, and relay K 2 dead electricity, alternating current generator 11 shuts down.
Therefore, the alternating current generator pressure-reduction starting device based on current settings of the present invention, simple in construction, cost is low, coordinated by current transformer, controller and three decimal scale BCD toggle switch, being capable of in alternating current generator Y-�� start-up course its stator winding from Y connection to the smooth conversion of �� connection, electric motor starting runs safety.
Refer to Fig. 1 to Fig. 3, the present invention also provides for a kind of method of above-mentioned alternating current generator pressure-reduction starting device based on current settings, including:
The external start signal of alternating current generator 11 is received by the corresponding input port of controller 25;
Detected the starting current of stator in described alternating current generator 11 start-up course by current transformer 20, and set the electric current when Y-�� of described alternating current generator 11 starts by three decimal scale BCD toggle switch 26;
The starting current that described controller 25 detects according to electric current and the described current transformer 20 of described three decimal scale BCD toggle switch 26 setting, the Y-�� startup conversion of described alternating current generator 11 is controlled, make the stator winding of described alternating current generator 11 be connected into Y shape when starting to start, when the starting current of described alternating current generator 11 reaches the electric current of described setting, be converted to �� shape followed by the stator winding controlling described alternating current generator 11 by Y shape connection to couple, terminate Y-�� and start.
Further, described Y-�� change-over circuit is mainly made up of two relay K 1 and K2, when external start signal received by controller, the closing of contact of catalyst KM1, the output port of the controller that relay K 1 coil connects is high level, relay K 1 is charged, and the stator winding of the auxiliary contact control alternating current generator of relay K 1 is connected into Y shape and starts; When the starting current of alternating current generator reaches the electric current of described setting, the output port output low level of the controller that relay K 1 coil connects, relay K 1 dead electricity, the output port output high level of the controller that relay K 2 coil connects, relay K 2 is charged, the auxiliary contact of relay K 2 controls the stator winding of alternating current generator and is converted to the connection of �� shape by Y shape connection, and startup terminates.
Further, when outside stop signal received by controller, the closing of contact of catalyst KM2, the input port of the controller that this contact connects is high level, the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current generator shuts down.
From the above mentioned, the method of the exchange pressure-reduction starting device based on current settings of the present invention, Y-�� start-up course is measured the starting current of the stator winding of alternating current generator by current transformer, and when the electric current that the starting current of motor sets close to three decimal scale BCD toggle switch, controller is made to send Y-�� conversion signal, Y connection when being started by stator winding converts �� connection to, terminate Y-�� to start, so that the decompression starting process of alternating current generator is steady, nothing is impacted, it is ensured that the startup safety of motor.
Claims (10)
1. the alternating current generator pressure-reduction starting device based on current settings, it is characterised in that be mainly made up of current transformer, three decimal scale BCD toggle switch and controller; Wherein, a winding of a power line described current transformer of traverse powered to alternating current generator, the Secondary Winding outfan of described current transformer connects the current detecting port of described controller; Three decimal scale BCD toggle switch are respectively connecting to the current settings port that described controller is corresponding, and electric current during for the Y-�� of described alternating current generator is started is set; The output port of described controller connects the Y-�� change-over circuit of alternating current generator, the corresponding input port of the outside startup/stop signal input extremely described controller of described alternating current generator.
2. alternating current generator pressure-reduction starting device as claimed in claim 1, it is characterized in that, after the Secondary Winding outfan of described current transformer is sequentially connected with single phase bridge type rectifier circu, filter circuit, potential regulator and analog to digital conversion circuit, it is connected to the current detecting port of described controller.
3. alternating current generator pressure-reduction starting device as claimed in claim 1, it is characterised in that described current transformer is fixed on the mounting rail of described alternating current generator by screw and an installing rack.
4. alternating current generator pressure-reduction starting device as claimed in claim 1, it is characterised in that described controller is AT89C52 series monolithic controller.
5. alternating current generator pressure-reduction starting device as claimed in claim 1, it is characterised in that each BCD toggle switch has 5 pins: 8,4,2,1 and A, A is common port, connect+5V power supply, the numeral on BCD toggle switch from 0 change to 9 time, 8,4,2,1 pin will export corresponding level.
6. alternating current generator pressure-reduction starting device as claimed in claim 1, it is characterized in that, described Y-�� change-over circuit is mainly made up of two relay K 1 and K2, relay K 1 and K2 coil connect the corresponding output port of described controller respectively, outside startup/the stop signal of described alternating current generator is respectively through catalyst KM1, the input port of the contact input extremely described controller of KM2, and when the closing of contact of catalyst KM1, the input port of the controller that this contact connects is high level, the output port of the controller that relay K 1 coil connects is high level, relay K 1 is charged, the stator winding of the auxiliary contact control alternating current generator of relay K 1 is connected into Y shape and starts, when the starting current of alternating current generator reaches the electric current that described three decimal scale BCD toggle switch set, the output port output low level of the controller that relay K 1 coil connects, relay K 1 dead electricity, the output port output high level of the controller that relay K 2 coil connects, relay K 2 is charged, the auxiliary contact of relay K 2 controls the stator winding of alternating current generator and is converted to the connection of �� shape by Y shape connection, and startup terminates, when the closing of contact of catalyst KM2, the input port of the controller that this contact connects is high level, and the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current generator shuts down.
7. alternating current generator pressure-reduction starting device as claimed in claim 6, it is characterized in that, described Y-�� change-over circuit also includes display lamp, described display lamp is connected to the display lamp of described controller and controls port, and when the stator winding of described alternating current generator is connected into Y shape startup, described display lamp controls port output high level, the charged instruction of display lamp; When the stator winding of described alternating current generator is transferred to the connection of �� shape by Y shape connection, described display lamp controls port output low level, and display lamp dead electricity is extinguished.
8. the method for the alternating current generator pressure-reduction starting device based on current settings as according to any one of claim 1 to 7, it is characterised in that including:
The external start signal of alternating current generator is received by the corresponding input port of controller;
By the starting current of current transformer detection stator in described alternating current generator start-up course, and set the electric current when Y-�� of described alternating current generators starts by three decimal scale BCD toggle switch;
The starting current that described controller detects according to electric current and the described current transformer of described three decimal scale BCD toggle switch setting, the Y-�� startup conversion of described alternating current generator is controlled, make the stator winding of described alternating current generator be connected into Y shape when starting to start, when the starting current of described alternating current generator reaches the electric current of described setting, be converted to �� shape followed by the stator winding controlling described alternating current generator by Y shape connection to couple, terminate Y-�� and start.
9. method as claimed in claim 8, it is characterized in that, described Y-�� change-over circuit is mainly made up of two relay K 1 and K2, when external start signal received by controller, the closing of contact of catalyst KM1, the output port of the controller that relay K 1 coil connects is high level, and relay K 1 is charged, and the stator winding of the auxiliary contact control alternating current generator of relay K 1 is connected into Y shape and starts; When the starting current of alternating current generator reaches the electric current of described setting, the output port output low level of the controller that relay K 1 coil connects, relay K 1 dead electricity, the output port output high level of the controller that relay K 2 coil connects, relay K 2 is charged, the auxiliary contact of relay K 2 controls the stator winding of alternating current generator and is converted to the connection of �� shape by Y shape connection, and startup terminates.
10. method as claimed in claim 9, it is characterized in that, when outside stop signal received by controller, the closing of contact of catalyst KM2, the input port of the controller that this contact connects is high level, the output port output low level of the controller that relay K 2 coil connects, relay K 2 dead electricity, described alternating current generator shuts down.
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| CN201610060352.5A CN105634337A (en) | 2016-01-28 | 2016-01-28 | Current setting-based AC motor decompression starting device and method |
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| CN201610060352.5A CN105634337A (en) | 2016-01-28 | 2016-01-28 | Current setting-based AC motor decompression starting device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201353889Y (en) * | 2008-11-08 | 2009-12-02 | 安徽天源棉花机械自动化研究有限公司 | Energy-saving controller for cotton press |
| US20140070754A1 (en) * | 2012-09-10 | 2014-03-13 | Sandvik Mining And Construction Oy | Mining Vehicle |
| CN104310190A (en) * | 2014-08-26 | 2015-01-28 | 日立电梯（广州）自动扶梯有限公司 | Escalator control system and method for controlling operation of escalator |
| JP2015078607A (en) * | 2013-10-15 | 2015-04-23 | 株式会社神戸製鋼所 | Starting device and starting method of compressor |
-
2016
- 2016-01-28 CN CN201610060352.5A patent/CN105634337A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201353889Y (en) * | 2008-11-08 | 2009-12-02 | 安徽天源棉花机械自动化研究有限公司 | Energy-saving controller for cotton press |
| US20140070754A1 (en) * | 2012-09-10 | 2014-03-13 | Sandvik Mining And Construction Oy | Mining Vehicle |
| JP2015078607A (en) * | 2013-10-15 | 2015-04-23 | 株式会社神戸製鋼所 | Starting device and starting method of compressor |
| CN104310190A (en) * | 2014-08-26 | 2015-01-28 | 日立电梯（广州）自动扶梯有限公司 | Escalator control system and method for controlling operation of escalator |
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Application publication date: 20160601 |
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