CN101022215A - Phase switch device for three-phase motor - Google Patents
Phase switch device for three-phase motor Download PDFInfo
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- CN101022215A CN101022215A CNA2007100052877A CN200710005287A CN101022215A CN 101022215 A CN101022215 A CN 101022215A CN A2007100052877 A CNA2007100052877 A CN A2007100052877A CN 200710005287 A CN200710005287 A CN 200710005287A CN 101022215 A CN101022215 A CN 101022215A
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Abstract
The invention provides a phase switching unit, including: phase switching relay composed of sequent two groups of relay of positive phase relay and reversed phase relay for switching three-phase alternating-current supply; primary relay for switching and cutting the driving phase switching relay; selective relay for selecting one of positive phase relay and reversed phase relay of phase switching relay; three groups of phase detecting circuit for detecting different phase signal of the three-phase alternating-current supply of load side of phase switching relay at the zero cross; and control part for cutting primary relay and selective relay then switching on the control primary relay when the signal sequence detected by the three phase detecting circuit is not positive after switching on the control primary relay and preventing to switch the primary relay when detecting more than one phase detecting circuit in the three groups to output during the period of cutting the primary relay.
Description
Technical field
The present invention relates to a kind ofly in the threephase motor of the compressor that drives air conditioner etc., three-phase alternating-current supply is anti-phase when connecting, the protective device during phase shortage.
Background technology
The threephase motor that does not allow to drive the compressor of air conditioner etc. makes the compressor reverse rotation; in addition, because phase current increases under non-full-phase state, the motor heating; and become the reason of fault, therefore need be when the anti-phase connection of three-phase alternating-current supply, protect during phase shortage.
In the past, the protective device during as anti-phase connect of threephase motor, during phase shortage for example, possessed: connect and disconnect the motor driven relay (relay) of three-phase alternating-current supply to the supply circuit of threephase motor; Switching is to the phase place transfer relay of the phase sequence of the three-phase alternating-current supply of motor driven relay supply; And, at the three-phase alternating-current supply that offers motor driven relay is when pursuing the phase sequence of the regulation that staggers each other mutually, the a plurality of anti-phase relay that prevents of circuit-closing contacts respectively, under the situation that each anti-phase at least one contact that prevents relay disconnects, switch the phase sequence (for example with reference to patent documentation 1) of the three-phase alternating-current supply that the motor driven relay side is supplied with by the phase place transfer relay.
Fig. 4 is the structure chart that the phase shortage of patent documentation 1 described threephase motor in the past, anti-phase operation prevent circuit.This phase shortage, anti-phase operation prevent circuit, comprising: the motor drive circuit 10 that drives threephase motor 2 by the three-phase alternating-current supply of power supply 1; Switching is from positive, the anti-phase transfer relay circuit 20 of the phase sequence of the three-phase alternating-current supply of power supply 1 supply; The first anti-phase relay 30 that prevents of circuit-closing contacts when the three-phase alternating-current supply of supplying with from power supply 1 is the phase sequence of regulation; At the three-phase alternating-current supply of supplying with from power supply 1 is the relative first anti-phase second anti-phase relay 40 that prevents of circuit-closing contacts when preventing that relay 30 from staggering the phase sequence of regulation of a phase; Comprise the first and second anti-phase phase shortage/anti-phase testing circuit 50 that prevents the contact of relay 30,40; Send the alarm device 60 of the alarm of regulation; Detect the motor drive circuit 10 of the open and-shut mode of phase shortage/anti-phase testing circuit 50; And, the control part 70 of control positive/anti-phase transfer relay circuit 20 and alarm device 50.
Motor drive circuit 10 is arranged on motor 2 one sides, the power-supply circuit that opens and closes motor 2 by the relay that is connected with control part 70 11.
Positive/anti-phase transfer relay circuit 20 is arranged on power supply 1 one sides, and by the relay 21 that is connected with control part 70, the phase of selecting ground switching three-phase alternating-current supply is two power-supply circuits of opposite phase sequence each other, switches the phase sequence of supply power.
The first anti-phase relay 30 that prevents by constituting with each resistor, capacitor and coil that connects respectively mutually of three-phase alternating-current supply, is regulation order, for example R phase → S phase → T phase time at the phase sequence of three-phase alternating-current supply, and coil is by excitation back contact 31 closures.
The second anti-phase relay 40 that prevents, anti-phasely prevent that relay 30 is identical with first, by constituting with each resistor, capacitor and coil that connects respectively mutually of three-phase alternating-current supply, phase sequence at three-phase alternating-current supply, for the relative first anti-phase relay 30 that prevents staggers under the situation of phase sequence, for example T phase → R phase → S phase of a phase, coil is by excitation back contact 41 closures.That is, connect going up mutually of first anti-phase resistor, capacitor and the coil that prevents relay 30 respectively, second anti-phase connecting coil, resistor and the capacitor respectively of preventing in the relay 40.
Phase shortage/anti-phase testing circuit 50 prevents the connection that is one another in series of the contact 31,41 of relay 30,40 with first and second phase shortage, and its two ends are connected with control part 70.
[patent documentation 1] spy opens the 2000-152491 communique.
But, in above-mentioned structure in the past, need to use two anti-phase relays that prevent, this is anti-phase prevent relay by phase-detection with resistance, capacitor and coil with connect the contact that disconnects by this coil and constitute, the size of parts and cost are individual problems.In addition, the positive of positive/anti-phase transfer relay circuit 20 with relay or anti-phase with relay any the situation of contact generation welding under, can produce the phase fault of three phase mains in the moment of switching positive/anti-phase transfer relay circuit 20 by relay 21.In addition, even welding does not take place in relay tip, the phase fault of three phase mains also may take place in the opportunity of the delay of the mechanicalness action of the relay tip according to positive during with relay and anti-phase switching with relay or the state of electric arc, has the problem of fail safe aspect.
Summary of the invention
The present invention is used to solve above-mentioned existing problem just and proposes, its purpose is: provide a kind of small-sized, cheap and improve the phase place switching device shifter of fail safe, this phase place switching device shifter detects anti-phase connection, the phase shortage of three-phase alternating-current supply, can switch to positive under the situation of anti-phase connection.
In order to address the above problem, the phase place switching device shifter of threephase motor of the present invention possesses: motor driven relay, connect the supply circuit of disconnection three-phase alternating-current supply to threephase motor; The phase place transfer relay in order to switch the phase sequence of the three-phase alternating-current supply that this motor driven relay is supplied with, is made of with relay and anti-phase two group relaies with relay the positive of one mutually public, other two-phases connection intersected with each other; Main relay, the connection that drives this phase place transfer relay disconnects; Selective relay is connected in series with this main relay, and the positive of selecting the phase place transfer relay is with relay or anti-phase with one of relay; Three groups of phase detecting circuits detect each phase signal of three-phase alternating current of the load-side of phase place transfer relay constantly in zero crossing; And, control part, control motor driven relay, main relay, selective relay detect the signal that whether has from phase detecting circuit, and judge that the rising of signal or the order of decline carry out whether three groups of interchanges are the judgement of positive, after connecting the above-mentioned main relay of control, judge the order of signal of three groups phase detecting circuit, after being judged as three-phase alternating current under the situation of positive, disconnecting main relay, switch selective relay, connect the control main relay afterwards.
Thus, can constitute phase detecting circuit, can realize the phase place switching device shifter of threephase motor small-sized and at an easy rate by the semiconductor element of photoelectrical coupler etc.
The invention effect
The phase place switching device shifter of threephase motor of the present invention, small-sized, cheap and raising provides a kind of anti-phase connection, phase shortage that detects three-phase alternating-current supply safely, and can switch to the phase place switching device shifter of positive under the situation of anti-phase connection.
Description of drawings
Fig. 1 is the structure chart of phase place switching device shifter of the threephase motor of embodiments of the present invention 1.
Fig. 2 is the phase signal oscillogram of the phase detecting circuit of embodiments of the present invention 1.
Fig. 3 is the flow chart of action of the control part of expression embodiments of the present invention 1.
Fig. 4 is the structure chart of the phase place switching device shifter of threephase motor in the past.
Among the figure: the 1-three-phase alternating-current supply; The 2-threephase motor; The 3-motor driven relay; 4-phase place transfer relay; 401-positive relay; The anti-phase relay of using of 402-; The 5-main relay; The 6-selective relay; The 7-phase detecting circuit; The 8-control part; 9-abnormal show device.
Embodiment
First invention possesses: motor driven relay, connect the supply circuit of disconnection three-phase alternating-current supply to threephase motor; The phase place transfer relay in order to switch the phase sequence of the three-phase alternating-current supply that this motor driven relay is supplied with, is made of with relay and anti-phase two group relaies with relay the positive of one mutually public, other two-phases connection intersected with each other; Main relay, the connection that drives this phase place transfer relay disconnects; Selective relay is connected in series with this main relay, and the positive of selecting the phase place transfer relay is with relay or anti-phase with one of relay; Three groups of phase detecting circuits detect each phase signal of three-phase alternating current of the load-side of phase place transfer relay constantly in zero crossing; And, control part, the control motor driven relay, main relay, selective relay, detect the signal that whether has from phase detecting circuit, and judge that the rising of signal or the order of decline carry out whether three groups of interchanges are the judgement of positive, after connecting the above-mentioned main relay of control, judge the order of signal of three groups phase detecting circuit, be judged as three-phase alternating current not under the situation of positive, after disconnecting main relay, switch selective relay, connect the control main relay afterwards, can constitute phase detecting circuit by the semiconductor element of photoelectrical coupler etc. thus, can realize the phase place switching device shifter of threephase motor small-sized and at an easy rate.
Second invention, especially during the main relay that disconnects control first invention, when detecting in three groups of phase detecting circuits more than one output, forbid above-mentioned main relay is switched to connection, and make the work of abnormal show device, by detecting welding on relay or anti-phase contact at the positive of phase place transfer relay like this, can avoid the generation of the phase fault of three phase mains with one of relay.
The 3rd invention, especially behind the selective relay that switches first invention, judge the order of the signal of three groups of phase detecting circuits, judging that three-phase alternating current is not under the situation of positive, after disconnecting main relay, selective relay is restored, and make the work of abnormal show device, by like this, the generation of the phase fault of the three phase mains that the opportunity of the delay of the mechanicalness action of the relay tip in the time of can avoiding because of positive with relay and anti-phase switching with relay or the state of electric arc cause.
Below, with reference to accompanying drawing embodiments of the present invention are described.In addition, be not to limit the present invention with this execution mode.
(execution mode 1)
Fig. 1 is the structure chart of phase place switching device shifter of the threephase motor of first execution mode of the present invention.This device has: the motor driven relay 3 that drives threephase motor 2 by three-phase alternating-current supply 1; The phase sequence of the three-phase alternating current that switching is supplied with from three-phase alternating-current supply 1 by positive with relay 401 and the anti-phase phase place transfer relay 4 that constitutes with two group relaies of relay 402; Drive the main relay 5 of the connection disconnection of phase place transfer relay 4; The selective relay 6 of the positive usefulness relay 401 of selection phase place transfer relay 4 or any of anti-phase usefulness relay 40; At zero crossing three groups of phase detecting circuits 7 of each phase signal of the three-phase alternating current of the load-side of detected phase transfer relay 4 constantly; Control selective relay 6, detect the order that has or not and judge the rising or the decline of signal, and whether carry out three-phase current be the control part 8 of the judgement of positive from the signal of phase detecting circuit; And, by abnormal show device 9 from the signal work of control part 8.
The positive of phase place transfer relay 4 relay 40 and anti-phase with relay 402, constitute and make the three-phase alternating current of being imported become opposite phase sequence each other, connect the selective relay 6 that disconnects these two relays by selecting a ground, switch the phase sequence of supply power.In addition, by main relay 5, the connection of energy control phase transfer relay 4 disconnects, and whether control is to energising after the phase place transfer relay 4.
With reference to Fig. 3,, the action that above-mentioned control part 8 is implemented is described to the phase place switching device shifter of above such threephase motor that constitutes.
At first, energized (S1) detects the input signal (S2) that whether has in the stipulated time T1 (for example during a second) from three groups phase detecting circuit 7.Because the state of the main relay 5 during power connection is for disconnecting, the state of selective relay 6 is selected positive relay 401, therefore under the situation that any signal is transfused to, be estimated as positive with relay 401 or anti-phase, therefore carry out the unusual demonstration of contact welding (S3) with one of relay 402 generation welding.Under situation not, connect main relay 5 (S4), and connect phase place transfer relay 4 from the input signal of the phase detecting circuit 7 of three-phase.Its result selects the state of positive with relay 401 because selective relay 6 is in, so positive is provided for the back level of phase place transfer relay 4.
On the other hand, be not under the situation of positive in input from the phase detecting circuit 7 of three-phase, disconnect main relay 5 (S7), detect the input signal (S8) that whether has from three groups phase detecting circuit 7 once more.Under the situation that is transfused to any signal during the T1, infer positive with relay 401 or anti-phase with one of relay 402 generation welding, therefore carry out the unusual demonstration of contact welding (S3).
During T1, not under the situation from the input signal of the phase detecting circuit 7 of three-phase, with selective relay 6 as anti-phase with relay side (S9), connect main relay 5 (S10) afterwards.At the appointed time T2 (for example during 5 seconds) during be continuously under the situation of input of positive, transfer to common action (S11), but under the situation that can't detect the positive input, disconnect main relay 5 (S12) afterwards, with selective relay 6 as positive with relay side (S13), and carry out abnormal show (S14).Since this moment be estimated as phase shortage unusually, therefore carry out the unusual demonstration of phase shortage.
Thus, can constitute phase detecting circuit, can realize the phase place switching device shifter of small-sized and cheap threephase motor by the semiconductor element of photoelectrical coupler etc.
In addition, during disconnection control main relay, in detecting the phase detecting circuit of three-phase under the situation of more than one output, forbid main relay is switched to connection, and make the work of abnormal show device, can detect welding on relay or anti-phase contact at the positive of phase place transfer relay thus, avoid the generation of the phase fault of three phase mains, and can perceive unusual intuitively with one of relay.
In addition, after switching selective relay, judge the order of the signal of three-phase phase testing circuit, after being judged as three-phase alternating current not under the situation of positive, disconnecting main relay, selective relay is restored, make the work of abnormal show device, by like this, the phase fault of the three phase mains that the opportunity of the delay of the mechanicalness action of the relay tip in the time of can avoiding because of positive with relay and anti-phase switching with relay or the state of electric arc cause, and can perceive unusual intuitively.
As mentioned above, the phase place switching device shifter of threephase motor provided by the invention, small-sized, cheap and improved fail safe, can detect anti-phase connection, the phase shortage of three-phase alternating-current supply, changeable under the situation of anti-phase connection is positive, therefore can be widely applicable for the cooling/refrigerating plant of employing compressor etc.
Claims (3)
1, a kind of phase place switching device shifter of threephase motor is characterized in that:
Possess: motor driven relay, connect the supply circuit of disconnection three-phase alternating-current supply to threephase motor;
The phase place transfer relay in order to switch the phase sequence of the three-phase alternating-current supply that this motor driven relay is supplied with, is made of with relay and anti-phase two group relaies with relay the positive of one mutually public, other two-phases connection intersected with each other;
Main relay, the connection that drives this phase place transfer relay disconnects;
Selective relay is connected in series with this main relay, and the positive of selecting above-mentioned phase place transfer relay is with relay or anti-phase with one of relay;
Three groups of phase detecting circuits detect each phase signal of three-phase alternating current of the load-side of above-mentioned phase place transfer relay constantly in zero crossing; And,
Control part is controlled above-mentioned motor driven relay, main relay, selective relay, detects the signal whether have from above-mentioned phase detecting circuit, and judges that the rising of signal or the order of decline carry out whether three groups of interchanges are the judgement of positive,
After connecting the above-mentioned main relay of control, judge the order of the signal of above-mentioned three groups phase detecting circuit, after being judged as three-phase alternating current not under the situation of positive, disconnecting above-mentioned main relay, switch selective relay, the main relay of connection control afterwards.
2, the phase place switching device shifter of threephase motor according to claim 1 is characterized in that,
Possess the abnormal show device that demonstrates to abnormality,
During disconnection control main relay, detect under the situation of more than one output in three groups of phase detecting circuits, forbid above-mentioned main relay is switched to connection, and make the work of above-mentioned abnormal show device.
3, the phase place switching device shifter of threephase motor according to claim 1 is characterized in that,
Possess the abnormal show device that demonstrates to abnormality,
After switching selective relay, judge the order of the signal of three groups of phase detecting circuits, after being judged as three-phase alternating current not under the situation of positive, disconnecting main relay,, make the work of above-mentioned abnormal show device with above-mentioned selective relay recovery.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006036299A JP2007221850A (en) | 2006-02-14 | 2006-02-14 | Phase change system of three-phase motor |
| JP2006036299 | 2006-02-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101022215A true CN101022215A (en) | 2007-08-22 |
| CN100576679C CN100576679C (en) | 2009-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710005287A Active CN100576679C (en) | 2006-02-14 | 2007-02-14 | The phase place switching device shifter of threephase motor |
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| Country | Link |
|---|---|
| JP (1) | JP2007221850A (en) |
| CN (1) | CN100576679C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976994A (en) * | 2010-09-17 | 2011-02-16 | 三一重工股份有限公司 | Conversion circuit, method and system for detecting phase sequence of three-phase power supply, and motor |
| CN103296962A (en) * | 2012-02-29 | 2013-09-11 | 艾默生电气公司 | Speed control of variable-speed and multi-phase motor |
| CN103903912A (en) * | 2014-04-14 | 2014-07-02 | 杭州得诚电力科技有限公司 | Synchronous switch and control method thereof |
| CN110785618A (en) * | 2017-07-03 | 2020-02-11 | 宁波吉利汽车研究开发有限公司 | Method for controlling a heat pump system |
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| JP2009189205A (en) * | 2008-02-08 | 2009-08-20 | Furukawa Rock Drill Co Ltd | Phase switching device |
| CN102545772B (en) * | 2010-12-24 | 2015-07-22 | 珠海格力电器股份有限公司 | Control method for gear shifting of multi-gear motor |
| WO2013145484A1 (en) * | 2012-03-30 | 2013-10-03 | 新電元工業株式会社 | Control circuit and power generating device provided with control circuit |
| JP2017053604A (en) * | 2015-09-11 | 2017-03-16 | 東芝キヤリア株式会社 | Portable type cool box |
| US10944350B2 (en) * | 2017-07-26 | 2021-03-09 | Mitsubishi Electric Corporation | Motor drive device |
| CN108321770A (en) * | 2017-12-29 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of multiphase phase sequence switching device and method |
-
2006
- 2006-02-14 JP JP2006036299A patent/JP2007221850A/en active Pending
-
2007
- 2007-02-14 CN CN200710005287A patent/CN100576679C/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976994A (en) * | 2010-09-17 | 2011-02-16 | 三一重工股份有限公司 | Conversion circuit, method and system for detecting phase sequence of three-phase power supply, and motor |
| CN103296962A (en) * | 2012-02-29 | 2013-09-11 | 艾默生电气公司 | Speed control of variable-speed and multi-phase motor |
| US10084406B2 (en) | 2012-02-29 | 2018-09-25 | Emerson Electric Co. | Speed control of variable-speed multiple-phase motors |
| CN103903912A (en) * | 2014-04-14 | 2014-07-02 | 杭州得诚电力科技有限公司 | Synchronous switch and control method thereof |
| CN110785618A (en) * | 2017-07-03 | 2020-02-11 | 宁波吉利汽车研究开发有限公司 | Method for controlling a heat pump system |
| CN110785618B (en) * | 2017-07-03 | 2021-12-31 | 宁波吉利汽车研究开发有限公司 | Method for controlling a heat pump system |
| US11384968B2 (en) | 2017-07-03 | 2022-07-12 | Ningbo Geely Automobile Research & Development Co. Ltd. | Method for controlling a heat pump system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100576679C (en) | 2009-12-30 |
| JP2007221850A (en) | 2007-08-30 |
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