CN1041074A - AC contact-less switch with kinetic-energy braking - Google Patents
AC contact-less switch with kinetic-energy braking Download PDFInfo
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- CN1041074A CN1041074A CN 89105945 CN89105945A CN1041074A CN 1041074 A CN1041074 A CN 1041074A CN 89105945 CN89105945 CN 89105945 CN 89105945 A CN89105945 A CN 89105945A CN 1041074 A CN1041074 A CN 1041074A
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- thyristor
- kinetic
- braking
- energy braking
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Abstract
The reversible noncontacting switch of three-phase alternating current with kinetic-energy braking function is applicable to the manufacturing machine that needs frequent start-stop, rotating in the industries such as metallurgy, machinery and quick and precisely stop.Owing to divided the braking thyristor groups after the forward and backward according to turning to, and make thyristor when rotating at first the direction of conducting match with the direction of when braking conducting, the present invention makes size that AC contact-less switch can carry out safe and effective kinetic-energy braking, stalling current with the on-off controller adjustment that is provided with in the control circuit.
Description
The invention belongs to electric power and electrical engineering switching device.
In industries such as metallurgy, machinery, used AC contact-less switch more at large, main circuit as shown in Figure 1, wherein bidirectional thyristor 5 also can.Its effect is to substitute A.C. contactor threephase asynchronous is carried out frequent start-stop and rotating control, and this has very big benefit for the manufacturing machine of bearing hard work under mal-condition and streamline.
The shortcoming of this switch is when stopping, if take free parking, then required time is oversize; If take fierce plug braking, process needs and can accelerate, but is difficult for accurate stopping.Needing the occasion of accurate stopping, the reply motor adopts kinetic-energy braking.So main circuit shown in Figure 2 occurred, it is to install controllable rectifying device 6 additional to constitute on the basis of Fig. 1, and its shortcoming is to have adopted two cover thyristor units, and area occupied is big, price is expensive, the operation is also unreliable.
Purpose of the present invention is exactly the shortcoming that overcomes aforementioned circuit, develop a kind of novel AC contact-less switch device with kinetic-energy braking function, can realize frequent start-stop and rotating control to asynchronous motor, can when stopping, realize kinetic-energy braking safely and effectively again, to guarantee the parking quick and precisely of manufacturing machine.
The present invention organically combines the reversible AC contact-less switch circuit of three-phase and kinetic-energy braking circuit, its main circuit as shown in Figure 3, control circuit such as Fig. 4, shown in Figure 5.Being made up of bidirectional thyristor 1,3 just changes thyristor groups, and the control asynchronous motor just changes, and forms the counter-rotating thyristor groups by bidirectional thyristor 2,4, the counter-rotating of control asynchronous motor, and this is identical with method that the general reversible AC contact-less switch of three-phase is controlled rotating.
In order to make AC contact-less switch have the function of kinetic-energy braking, in Fig. 1 circuit, installed additional after the unidirectional thyristor 7, obtain Fig. 3, the present invention divides the kinetic-energy braking thyristor groups that bidirectional thyristor 1 and unidirectional thyristor 7 formed after just changeing, and the kinetic-energy braking in the docking process of back is just being changeed in control; Divide the kinetic-energy braking thyristor groups after bidirectional thyristor 4 and unidirectional thyristor 7 are formed counter-rotating, the kinetic-energy braking after the control inversion in the docking process.In the kinetic-energy braking process after just changeing, control circuit guarantees bidirectional thyristor 1 only a direction conducting, in order to from power supply to the asynchronous motor stator provider to constant DC injection braking electric current, thyristor 7 plays the afterflow effect.In the kinetic-energy braking process after the counter-rotating, bidirectional thyristor 4 is only a direction conducting, in order to from power supply to the asynchronous motor stator provider to constant DC injection braking electric current, thyristor 7 plays the afterflow effect.
Owing to just changeing thyristor groups and just changeing the shared bidirectional thyristor 1 of back braking thyristor groups, because counter-rotating thyristor groups and the shared bidirectional thyristor 4 of counter-rotating back braking thyristor groups, phase fault all can not take place in kinetic-energy braking after therefore no matter just changeing or the kinetic-energy braking after the counter-rotating.
Owing to just changeing back kinetic-energy braking thyristor groups and shared 1 unidirectional thyristor 7 afterflow of counter-rotating back kinetic-energy braking thyristor groups, since when control circuit guarantees just to change starting bidirectional thyristor 1 at first the direction of conducting be exactly the direction of this thyristor conducting when braking, when starting counter-rotating bidirectional thyristor 4 at first the direction of conducting be exactly the direction of this thyristor conducting when braking, therefore, be just to change to start to connect the kinetic-energy braking process or reverse to start to connect all impossible phase fault that takes place of kinetic-energy braking process.
In order to regulate the size of stalling current, the present invention has adopted special method: set up on-off controller 26 in control circuit, the current switching ratio of bidirectional thyristor during with the control kinetic-energy braking, like this, during kinetic-energy braking the triggering signal of bidirectional thyristor not necessarily each cycle of AC power provide once, but the n of a power supply cycle provide once, n is an integer, its scope from 1 to 10, the make-to-break ratio n of on-off controller can give earlier according to capacity motor and being adjusted.
In order to regulate braking time, the present invention is provided with braking time controller 24 in control circuit, can adjust different braking times according to the inertia of motor model and manufacturing machine.Time 24, can adjust different braking times according to the inertia of motor model and manufacturing machine.Time controller can also compress the braking time behind the crawl automatically, and motor can not reach rated speed during crawl, the corresponding minimizing of required braking time.
Also be provided with to turn in control circuit and judge and delay circuit 16,17, the normal inching turning after just changeing with realization does not have time-delay, and the reverse inching turning after the counter-rotating does not have time-delay, and this also is the function that the operator welcomes very much.
Fig. 1 is the reversible AC contact-less switch main circuit of three-phase, and among Fig. 1,1,2,3,4,5 are bidirectional thyristor.Fig. 2 is an AC contact-less switch, and other adds a cover controllable rectifying device to realize the main circuit of kinetic-energy braking, and among Fig. 2,1,2,3,4,5 are bidirectional thyristor, and 6 is controllable rectifying device.Fig. 3 is the main circuit with AC contact-less switch of kinetic-energy braking, and among Fig. 3,1,2,3,4 are bidirectional thyristor, and 7 is unidirectional thyristor.Fig. 4 and Fig. 5 are the control circuit of Fig. 3; among Fig. 4 and Fig. 5; 8; 9; 10; 11; 12 respectively is the circuits for triggering of respective thyristor, 13; 14 are and door, and 15 is protective circuit; BH=1 during fault-free; 16; 17 for turning to judgement and delay circuit, and 18 is the synchronizing signal gating circuit, gating synchronizing signal AC+ when just changeing; gating synchronizing signal BC+ during counter-rotating; 19 is voltage comparator, and 20 is voltage comparator, and synchronizing signal is by this comparator during braking; 21 is switching transistor; synchronizing signal is a whole pulse when guaranteeing braking, and 22 is phase-shift circuit, and 23 are and door; 24 is the braking time controller; 25 is NAND gate, and when its output P was low level, motor carried out kinetic-energy braking; 26 is on-off controller, and 27 are braking thyristor selection circuit.Fig. 6 a is the AC supply voltage waveform, and Fig. 6 b is corresponding synchronization waveform.
Fig. 3, Fig. 4 and Fig. 5 constitute embodiments of the invention.
Logical signal Z, F that master switch provides are as shown in table 1:
Table 1
| Handle position | Z | F |
| Counter-rotating | 0 | 1 |
| Stop | 1 | 1 |
Synchronizing signal AC+ and BC+ with the relation of supply voltage UAC and UBC as shown in Figure 6, the t express time.
Be specifically described below
1. rotate and reverse
When placing positive transposition, puts by handle, Z=1, and F=0 is with door 13 output Z
1=1, circuits for triggering 8 and 10 work, just commentaries on classics group bidirectional thyristor 1,3 triggers, and motor just changes.
When handle places backward position, Z=0, F=1 is with door 14 output F
1=1, circuits for triggering 9 and 11 work, counter-rotating group bidirectional thyristor 2,4 triggers, the motor counter-rotating.
2. just changeing in service, handle is got to backward position suddenly
Because F=0 when just changeing turns to judgement and delay circuit 16 to be output as 0.When handle is operated counter-rotating suddenly, though F becomes 1 by 0, turn to judgement and delay circuit 16 outputs to need to become 1 by 0 through about 100ms that delays time, in this section delay time, be output as 0 with door 14, counter-rotating group bidirectional thyristor can not be opened, and guaranteeing the reverse recovery of just commentaries on classics group bidirectional thyristor, otherwise phase fault will take place.After time-delay finished, motor just began plug braking and back-to-back starting.
It is in service to reverse, and handle is got to positive transposition suddenly and put, the process that is taken place and last similar.
3. crawl working condition
Just transporting behind the row when connecing normal inching turning,, turning to and judge and delay circuit 17 outputs are 1 all the time, so continuous normal inching turning does not have time-delay because Z is always 1.
In like manner, the crawl counter-rotating does not also have time-delay continuously.
4. braking working condition
Be 1 with three inputs of door 23, the output signal P=0 of NAND gate 25, Here it is kinetic-energy braking signal.Low level brake signal P one tunnel control signal H makes H=0, thereby blocks and door 13 and 14, because Z
1=0, F
1=0, closed the triggering signal of rotating.Low level brake signal P one road delivers to voltage comparator 20, and the synchronizing signal AC+ that makes the gating circuit gating is through comparator 20 outputs.Low level brake signal P makes switching transistor 21 end again, allows the synchronizing signal of exporting through comparator 20 enter phase-shift circuit 22 and on-off controller 26.The latter's output signal one road is delivered to circuits for triggering 12 and is delivered to braking thyristor selection circuit 27 to trigger afterflow thyristor 7, a road.Because the braking front motor, is selected circuit 27 output Z for just changeing
2=1, F
2=0, then 1 work of circuits for triggering 8 and bidirectional thyristor, bidirectional thyristor 1 and only at AA
1The direction conducting.Owing to just changeing back kinetic-energy braking thyristor 1 and 7 work, asynchronous motor carries out kinetic-energy braking and stops rapidly.
The size of stalling current and the length of braking time can by on-off controller 26 and braking time controller 24 give earlier with to adjust.
The present invention is the AC contact-less switch with kinetic-energy braking, owing to divided different braking thyristor groups according to turning to, and make thyristor when running well at first the direction of conducting direction of conducting when braking match, the present invention makes AC contact-less switch can carry out safety, effective kinetic-energy braking, stalling current and braking time can give earlier and to adjust, be particularly suitable in the industries such as metallurgy, machinery, need frequent start-stop, rotating and the occasion of quick and precisely stopping.
Claims (4)
1; three-phase alternating current contactless switching device with kinetic-energy braking; it is by main circuit diagram 3; control circuit Fig. 4 and Fig. 5 form; main circuit comprises 4 bidirectional thyristors and 1 unidirectional thyristor; wherein; bidirectional thyristor 1 and 3 is formed is just changeing thyristor groups; bidirectional thyristor 2 and 4 is formed the counter-rotating thyristor groups; control circuit comprises circuits for triggering 8; 9; 10; 11; 12; with door 13; 14; 23; protective circuit 15; synchronizing signal gating circuit 18; voltage comparator 19; 20; switching transistor 21; phase-shift circuit 22; NAND gate 25; braking time controller 24; the braking thyristor is selected circuit 27; it is characterized in that bidirectional thyristor 1 and unidirectional thyristor 7 formed in the main circuit is just changeing back kinetic-energy braking thyristor groups; bidirectional thyristor 4 and unidirectional thyristor 7 are formed counter-rotating back kinetic-energy braking thyristor groups; in control circuit, set up to turn to and judged and delay circuit 16; 17, set up on-off controller 26.
2, main circuit according to claim 1, it is characterized in that just changeing back kinetic-energy braking thyristor groups and shared 1 unidirectional thyristor 7 of counter-rotating back kinetic-energy braking thyristor groups, just changeing thyristor groups and just changeing shared 1 bidirectional thyristor of back kinetic-energy braking thyristor groups, counter-rotating thyristor groups and shared 1 the two-way brake tube 4 of counter-rotating back kinetic-energy braking thyristor groups.
3, according to claim 1,2 described main circuits, it is characterized in that in the kinetic-energy braking process bidirectional thyristor 1 only a direction conducting, this direction is exactly this thyristor direction of conducting at first when just changeing starting; Bidirectional thyristor 4 is only a direction conducting in the kinetic-energy braking process, this thyristor direction of conducting at first when this direction is exactly the counter-rotating starting.
4, main circuit according to claim 1 and control circuit, the circuits for triggering that just changeing back kinetic-energy braking thyristor groups and counter-rotating back kinetic-energy braking thyristor groups when it is characterized in that kinetic-energy braking all are subjected to the control of on-off controller 26, the triggering signal that provides by this controller is to provide 1 time in several cycles of AC power, n is an integer, its scope from 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105945 CN1014384B (en) | 1989-08-17 | 1989-08-17 | Contactless ac switch with kinetic-energy braking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105945 CN1014384B (en) | 1989-08-17 | 1989-08-17 | Contactless ac switch with kinetic-energy braking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041074A true CN1041074A (en) | 1990-04-04 |
| CN1014384B CN1014384B (en) | 1991-10-16 |
Family
ID=4856577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89105945 Expired CN1014384B (en) | 1989-08-17 | 1989-08-17 | Contactless ac switch with kinetic-energy braking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1014384B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330084C (en) * | 2003-01-27 | 2007-08-01 | 罗姆股份有限公司 | Controller |
| CN109358288A (en) * | 2018-12-17 | 2019-02-19 | 南京埃斯顿自动化股份有限公司 | A kind of fault detection method of servo dynamic brake circuit |
| CN109715899B (en) * | 2016-09-22 | 2021-05-07 | 大众汽车有限公司 | Unlocking unit with variable release switch point |
-
1989
- 1989-08-17 CN CN 89105945 patent/CN1014384B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330084C (en) * | 2003-01-27 | 2007-08-01 | 罗姆股份有限公司 | Controller |
| CN109715899B (en) * | 2016-09-22 | 2021-05-07 | 大众汽车有限公司 | Unlocking unit with variable release switch point |
| US11319734B2 (en) | 2016-09-22 | 2022-05-03 | Volkswagen Aktiengesellschaft | Unlocking unit having a variable trigger switch point |
| CN109358288A (en) * | 2018-12-17 | 2019-02-19 | 南京埃斯顿自动化股份有限公司 | A kind of fault detection method of servo dynamic brake circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1014384B (en) | 1991-10-16 |
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