CN102624296A - Star-delta starting circuit and air conditioner with same - Google Patents
Star-delta starting circuit and air conditioner with same Download PDFInfo
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- CN102624296A CN102624296A CN2011100302648A CN201110030264A CN102624296A CN 102624296 A CN102624296 A CN 102624296A CN 2011100302648 A CN2011100302648 A CN 2011100302648A CN 201110030264 A CN201110030264 A CN 201110030264A CN 102624296 A CN102624296 A CN 102624296A
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- 238000004804 winding Methods 0.000 claims description 39
- 238000012360 testing method Methods 0.000 claims description 7
- 230000003111 delayed effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 6
- 238000013021 overheating Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
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Abstract
The invention provides a star-delta starting circuit and an air conditioner with the same, wherein the star-delta starting circuit is used for controlling the starting of a motor and comprises the following components: a first contactor; a second contactor; a third contactor; the star-delta starting circuit also comprises a relay which is provided with a fourth coil and a normally closed fourth contact, and the normally closed fourth contact is connected between the first coil and the first output end of the controller; the third contactor also comprises a normally closed first auxiliary contact which is connected between the first output end of the controller (10) and the fourth coil; the relay controls the on-off of the first coil according to the state of the first auxiliary contact of the third contactor after the first main contact is closed for a preset time. By applying the scheme of the invention, the motor can be protected.
Description
Technical field
The present invention relates to a kind of adjusting device of motor, relate in particular to a kind of star triangle start circuit and have its air conditioner.
Background technology
Motor of the prior art often adopts star triangle start mode.Star triangle start mode refers to, and the motor winding is connected into star during startup, and after startup finished to get into running status, the motor winding was formed triangle.
Fig. 1 shows the structural representation of star triangle start circuit of the prior art.As shown in Figure 1, star triangle start circuit of the prior art comprises contactor KM1 ', KM2 ' and KM3 '.Compressor M (motor) receives three contactor KM1 ', KM2 ' and KM3 ' control.During startup, the coil KM1 '-1 of KM1 and KM2 and KM2 '-1 get electric, are in "on" position, the main contacts KM1 '-2 of KM1 and KM2 and KM2 '-2 adhesive; Compressor (motor) realizes that star starts, and coil KM2 '-1 dead electricity of KM2 is in off-position after 5 seconds; The main contacts KM2 '-2 of KM2 breaks off, and the coil KM3 '-1 of KM3 must be electric after 40 milliseconds, is in "on" position; Main contacts KM3 '-2 adhesive of KM3, the winding of compressor (motor) is formed triangle, accomplishes to start.Because the main contacts KM2 '-2 of KM2 and KM3 and KM3 '-2 can not be closed simultaneously, therefore between contactor KM2 ' and KM3 ', set up and be equipped with interlock, as between the coil KM2 '-1 of KM2 ' and KM3 ' and KM3 '-1, increasing mechanical interlock.For example, can realize mechanical interlocked through the auxiliary contact KM2 '-3 of the second contactor KM2 ' shown in Fig. 1 and the auxiliary contact KM3 '-3 of the 3rd contactor KM3 '.
But if the mechanical interlocked control signal (or time relay of control contactor KM2 ' and KM3 ') that is stuck perhaps mainboard output between the star triangle start device breaks down; May cause star triangle start circuit can't the winding of motor be become triangle from star; Motor will be in the star running always; Then the power owing to motor can't drive load, thereby can cause motor overheating to be damaged.
Summary of the invention
The air conditioner that technical problem to be solved by this invention is that a kind of star triangle start circuit is provided and has it makes and breaks down and can't the winding of motor can be protected motor when star becomes triangle at star triangle start circuit.
In order to solve the problems of the technologies described above; According to an aspect of the present invention; A kind of star triangle start circuit is provided, has been used to control the startup of motor, having comprised: first contactor; First main contacts that has first coil and often open, first main contacts are connected between first end of AC power and motor winding; Second contactor, second main contacts that has second coil and often open, second main contacts is connected with second end of motor winding, is used to make the motor winding to form the Y-connection mode; The 3rd contactor, the 3rd main contacts that has tertiary coil and often open, the 3rd main contacts are connected between second end of AC power and motor winding, are used to make the motor winding to form the triangle connected mode; Controller has first output, second output and the 3rd output, and first output is connected with first coil; Second output is connected with second coil; The 3rd output is connected with tertiary coil, and controller is used to control the break-make of first coil, second coil and tertiary coil, and star triangle start circuit also comprises relay; Have the 4th coil and the 4th normally closed contact, the 4th normally closed contact is connected between first output of first coil and controller; The 3rd contactor also comprises the first normally closed auxiliary contact, is connected between first output and the 4th coil of controller; Wherein, relay is according to the break-make from first main contacts State Control first coil of first auxiliary contact of the 3rd contactor after the closed scheduled time.
Further, relay is a time-delay relay, and the 4th contact is a delayed contact, when being kept closed through first auxiliary contact after the scheduled time, postponing the contact and breaks off, and makes first coil blackout.
Further, the 3rd contactor also comprises the second normally closed auxiliary contact, is connected between second output of second coil and controller, is used for when tertiary coil is in "on" position, makes second coil blackout.
Further, second contactor also comprises the first normally closed auxiliary contact, and the first normally closed auxiliary contact of second contactor are connected between second output of tertiary coil and controller, are used for when second coil is in "on" position, makes the tertiary coil outage.
Further, when first auxiliary contact through the 3rd contactor after the scheduled time were kept closed, controller sent the control command of the 4th contact disconnection that makes relay.
Further, controller comprises detection module, is used to obtain the state of first auxiliary contact.
According to another aspect of the present invention; A kind of star triangle start circuit also is provided, has been used to control the startup of motor, having comprised: first contactor; First main contacts that has first coil and often open, first main contacts are connected between first end of AC power and motor winding; Second contactor, second main contacts that has second coil and often open, second main contacts is connected with second end of motor winding, is used to make the motor winding to form the Y-connection mode; The 3rd contactor, the 3rd main contacts that has tertiary coil and often open, the 3rd main contacts are connected between second end of AC power and motor winding, are used to make the motor winding to form the triangle connected mode; Controller; Have first output, second output and the 3rd output, first output is connected with first coil, and second output is connected with second coil; The 3rd output is connected with tertiary coil; Controller is used to control the break-make of first coil, second coil and tertiary coil, and the 3rd contactor also comprises the first normally closed auxiliary contact, is provided with in the controller to detect the first auxiliary contact switch status detection circuit; First auxiliary contact are connected on the testing circuit of controller; Controller is controlled the break-make electricity condition of first coil according to the on off operating mode from first main contacts, first auxiliary contact after the closed scheduled time.
According to a further aspect of the invention, a kind of air conditioner is provided also, has comprised the star triangle start circuit that is used for actuating motor, star triangle start circuit is above-mentioned star triangle start circuit.
Use technical scheme of the present invention; Through in star triangle start circuit, the 4th relay being set; Make the 4th relay through after the scheduled time according to the break-make of State Control first coil of first auxiliary contact of the 3rd contactor; Perhaps through in star triangle start circuit control device, testing circuit being set, controller can be according to the break-make of State Control first coil of first auxiliary contact of the 3rd contactor.Whether break down thereby make star triangle start circuit judge that the star triangle switches according to the state of the 3rd contactor, and being connected between the winding that when breaking down, breaks off motor and the AC power, make motor out of service.Thereby, can avoid star triangle start circuit with the winding of motor when star becomes triangle, motor to occur and to be in the situation that running status causes motor overheating to be damaged, make motor obtain protection.
Except top described purpose, feature and advantage, the present invention also has other purpose, feature and advantage.To do further detailed explanation to the present invention with reference to figure below.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the structural representation of star triangle start circuit of the prior art;
Fig. 2 shows the structural representation according to the star triangle start circuit of the embodiment of the invention one; And
Fig. 3 shows the structural representation according to the star triangle start circuit of the embodiment of the invention two.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Specify the structure of star triangle start circuit below in conjunction with Fig. 2 and Fig. 3.
Fig. 2 shows the structural representation according to the star triangle start circuit of the embodiment of the invention one.As shown in Figure 2, be used to control the star triangle start circuit that motor M starts and comprise the first contactor KM1, the second contactor KM2 and the 3rd contactor KM3.Wherein, the first contactor KM1 first main contacts KM1-2 that has the first coil KM1-1 and often open; The second main contacts KM2-2 that the second contactor KM2 has the second coil KM2-1 and often opens; The 3rd main contacts KM3-2 that the 3rd contactor KM3 has tertiary coil KM3-1 and often opens.
As shown in Figure 2, the first main contacts KM1-2 of the first contactor KM1 is connected between first end of AC power and motor M winding; The second main contacts KM2-2 is connected with second end of motor M winding, is used to make motor M winding to form the Y-connection mode; The 3rd main contacts KM3-2 is connected between second end of AC power and motor M winding, is used to make motor M winding to form the triangle connected mode.
And it is as shown in Figure 2; Controller 10 has first output, second output and the 3rd output; First output is connected with the first coil KM1-1; Second output is connected with the second coil KM2-1, and the 3rd output is connected with tertiary coil KM3-1, and controller 10 is used to control the break-make of first coil, second coil and tertiary coil.
In the present embodiment, star triangle start circuit also comprises: relay K T, have the 4th coil KT-1 and the 4th normally closed contact KT-2, and the 4th normally closed contact KT-2 is connected between first output of the first coil KM1-1 and controller.Wherein the 3rd contactor KM3 also comprises the first normally closed auxiliary contact KM3-3, is connected between first output and the 4th coil KT-1 of controller 10.And relay K T basis is from the break-make of the State Control first coil KM1-1 of the first auxiliary contact KM3-3 of the three contactor KM3 of the first main contacts KM1-2 after the closed scheduled time.
In a period of time after the star delta circuit is started working; Through setting to controller 10; Star triangle start circuit should convert the triangle mode into from star fashion and connect; Then the main contacts of KM3 should be in closure state, if the main contacts of KM3 is not closed, means that then controller 10 or mechanical interlocked parts break down.Because the auxiliary contact of contactor and the action of main contacts are consistent; Then in the present embodiment; The first normally closed auxiliary contact KM3-3 of the 3rd contactor KM3 is connected between first output and the 4th coil KT-1 of controller 10, just can judges the state of the main contacts KM3-2 of the 3rd contactor KM3 through the first auxiliary contact KM3-3 of the 3rd contactor KM3.
As shown in Figure 2; Through after the scheduled time, if star triangle start circuit is when star fashion converts the triangle mode into and connects, the main contacts KM3-2 of the 3rd contactor is closed; Then the first normally closed auxiliary contact KM3-3 of the 3rd contactor KM3 opens; The coil KT-1 dead electricity of the 4th relay K T that is attached thereto is in off-position, and coil KM1-1 still is in "on" position.And when star triangle start circuit not when star fashion converts the triangle mode into and connects, the main contacts KM3-2 of the 3rd contactor is in open mode, then the first normally closed auxiliary contact KM3-3 of the 3rd contactor KM3 is closed; The coil KT-1 of the 4th relay K T that is attached thereto gets; Be in "on" position, then the 4th normally closed contact KT-2 of the 4th relay K T can open, then coil KM1-1 dead electricity; Be in off-position; Then the first main contacts KM1-2 opens, and being connected between the winding of motor MM and the AC power is disconnected, and motor is out of service.Thereby, avoided star triangle start circuit with the winding of motor M when star becomes triangle, motor to occur and be in the situation that running status causes motor overheating to be damaged.
In the present embodiment promptly, through the 4th relay K T is set, make the 4th relay according to the scheduled time after the break-make of State Control first coil of first auxiliary contact of the 3rd contactor KM3.Whether break down thereby make star triangle start circuit judge that the star triangle switches according to the state of the 3rd contactor, and being connected between the winding that when breaking down, breaks off motor M and the AC power, make motor out of service.Thereby, can avoid star triangle start circuit with the winding of motor M when star becomes triangle, motor to occur and to be in the situation that running status causes motor overheating to be damaged, make motor obtain protection.
In the present embodiment; The 4th relay K T is a time-delay relay, and the 4th contact KT-2 is a delayed contact, wherein; Be the scheduled time start-up time that postpones the contact; If through from the first main contacts KM1-2 after the closed scheduled time the first auxiliary contact KM3-3 still be kept closed, postpone the contact and break off, make first coil KM1-1 outage.
For example, if suppose star triangle start circuit working after 5 seconds, the star triangle start should be accomplished switching.Suppose that simultaneously star triangle start circuit working after 7 seconds, does not still have adhesive if detect KM3-2, think that then star triangle start circuit breaks down.At this moment, be set to 7 seconds the time of delay of time-delay relay KT.After star triangle start circuit was started working, then the main contacts KM1-2 of contactor KM1 and KM2 and KM2-2 were closed, and the main contacts KM3-2 of KM3 is in off-state, and then the first auxiliary contact KM3-3 of KM3 is in closure state.If the star delta circuit is in proper working order, the main contacts KM3-2 of KM3 is closed in 7 seconds, and then the first auxiliary contact KM3-3 of KM3 breaks off, and time-delay relay KT stops timing, and delayed contact KT-2 is closed.And after star triangle start circuit is started working, if the operation irregularity of star delta circuit, break down or controller breaks down as mechanical interlocked; Can't in 7 seconds, make the main contacts KM3-2 of KM3 closed; Then time-delay relay KT will make the delay contact KT-2 of time-delay relay KT open after 7 seconds, thereby make the first coil KM1-1 dead electricity of the first contactor KM1, be in off-position; Thereby being connected between the winding that breaks off motor M and the AC power; Make motor out of service, motor is protected, prevent bigger accident.
As shown in Figure 2; In the present embodiment, the 3rd contactor KM3 also comprises the second normally closed auxiliary contact KM3-4, is connected between second output of the second coil KM2-1 and controller 10; Be used for when tertiary coil KM3-1 is in "on" position, make second coil KM2-1 outage.The second contactor KM2 also comprises the first normally closed auxiliary contact KM2-3; The first normally closed auxiliary contact KM2-3 of the second contactor KM2 is connected between second output of tertiary coil KM3-1 and controller 10; Be used for when the second coil KM2-1 is in "on" position, make tertiary coil KM3-1 outage.In the present embodiment promptly, realize electrical interlocks through the auxiliary contact of the second contactor KM2 and the 3rd contactor KM3.Certainly, also can adopt other interlock mode, make the second contactor KM2 when work, forbid the 3rd contactor KM3 work, make the 3rd contactor KM3 when work, forbid second relay K M2 work simultaneously.
Fig. 3 shows the structural representation according to the star triangle start circuit of the embodiment of the invention two.Present embodiment is equally applicable to the situation that star triangle start circuit breaks down.As shown in Figure 3, in the present embodiment, mainly utilize whether normally closed of main contacts that controller 10 judges the 3rd contactor KM3.
Similar with embodiment one, present embodiment also is to judge through the state of the first auxiliary contact KM3-3 that judges the 3rd contactor KM3 whether the main contacts KM3-2 of the 3rd contactor KM3 is in proper working order.
In the present embodiment, be provided with the testing circuit that detects the first auxiliary contact KM3-3 on off state in the controller 10.After the scheduled time after the first main contacts KM1-2 closure; The first auxiliary contact KM3-3 that controller 10 detects the 3rd contactor KM3 still is in closure state; The main contacts KM3-2 that then means the 3rd contactor KM3 still is in off-state; Controller 10 will make first coil KM1-1 outage by sending controling instruction, thereby the first main contacts KM1-2 is broken off.
Wherein, the concrete connected mode of the first auxiliary contact KM3-3 is as shown in Figure 3, is about to the first auxiliary contact KM3-3 and is connected in the testing circuit.
In the present embodiment, the testing circuit that controller 10 comprises is mainly used in the state of the first auxiliary contact KM3-3 that obtains the 3rd contactor KM3.As the magnitude of voltage of the first auxiliary contact KM3-3 that can be through detecting the 3rd contactor KM3 or the state that current value obtains the first auxiliary contact KM3-3 of the 3rd contactor KM3.Concrete obtain manner is existing in the prior art to be introduced in detail, repeats no more at this.
According to another aspect of the present invention, a kind of air conditioner is provided also, has comprised motor M, also comprised the star triangle start circuit that is used for actuating motor M, be connected between motor M and the AC power.Wherein, the star triangle start circuit in this air-conditioning is the star triangle start circuit in the foregoing description.The concrete structure of star triangle start circuit is existing in the above-described embodiments to be introduced in detail, repeats no more at this.
From above description, can find out that the above embodiments of the present invention have realized following technique effect:
When star triangle start circuit not when star fashion converts the triangle mode into and connects, the main contacts of the 3rd contactor is in open mode, then the first normally closed auxiliary contact of the 3rd contactor are closed; The coil of the 4th relay that is attached thereto gets electric, is in "on" position, and then the 4th normally closed contact of the 4th relay can be opened; Coil losing electricity then; Be in off-position, being connected between the winding of motor and the AC power is disconnected, and motor is out of service.Thereby avoided star triangle start circuit with the winding of motor when star becomes triangle, motor to occur and be in the situation that running status causes motor overheating to be damaged, made motor obtain protection.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a star triangle start circuit is used to control the startup of motor, comprising:
First contactor, first main contacts (KM1-2) that has first coil (KM1-1) and often open, said first main contacts (KM1-2) are connected between first end of AC power and motor winding;
Second contactor, second main contacts (KM2-2) that has second coil (KM2-1) and often open, said second main contacts (KM2-2) is connected with second end of said motor winding, is used to make said motor winding to form the Y-connection mode;
The 3rd contactor; The 3rd main contacts (KM3-2) that has tertiary coil (KM3-1) and often open; Said the 3rd main contacts (KM3-2) is connected between second end of said AC power and said motor winding, is used to make said motor winding to form the triangle connected mode;
Controller (10); Have first output, second output and the 3rd output; Said first output is connected with said first coil (KM1-1), and said second output is connected with said second coil (KM2-1), and said the 3rd output is connected with said tertiary coil (KM3-1); Said controller (10) is used to control the break-make of said first coil (KM1-1), said second coil (KM2-1) and said tertiary coil (KM3-1)
It is characterized in that:
Said star triangle start circuit also comprises relay, has the 4th coil (KT-1) and normally closed the 4th contact (KT-2), and said normally closed the 4th contact (KT-2) is connected between first output of said first coil (KM1-1) and said controller;
Said the 3rd contactor also comprises normally closed first auxiliary contact (KM3-3), is connected between first output and said the 4th coil (KT-1) of said controller (10);
Wherein, said relay is according to the break-make from said first main contacts (KM1-2) said first coil of State Control (KM1-1) of first auxiliary contact (KM3-3) of said the 3rd contactor (KM3) after the closed scheduled time.
2. star triangle start circuit according to claim 1; It is characterized in that; Said relay is a time-delay relay, and the 4th contact is a delayed contact, and said first auxiliary contact (KM3-3) are when being kept closed after the said scheduled time of process; Said delay contact is broken off, and makes said first coil (KM1-1) outage.
3. star triangle start circuit according to claim 2; It is characterized in that; Said the 3rd contactor also comprises normally closed second auxiliary contact (KM3-4); Be connected between second output of said second coil (KM2-1) and said controller (10), be used at said tertiary coil (KM3-1) when being in "on" position, make said second coil (KM2-1) outage.
4. according to claim 2 or 3 described star triangle start circuit; It is characterized in that; Said second contactor also comprises normally closed first auxiliary contact (KM2-3); Normally closed first auxiliary contact (KM2-3) of said second contactor (KM2) are connected between second output of said tertiary coil (KM3-1) and said controller (10), are used at said second coil (KM2-1) when being in "on" position, make said tertiary coil (KM3-1) outage.
5. star triangle start circuit according to claim 1; It is characterized in that; First auxiliary contact (KM3-3) of said the 3rd contactor are when being kept closed after the process scheduled time, and said controller sends the control command of the 4th contact (KT-2) disconnection that makes said relay.
6. star triangle start circuit according to claim 5 is characterized in that said controller (10) comprises detection module, is used to obtain the state of said first auxiliary contact.
7. a star triangle start circuit is used to control the startup of motor, comprising:
First contactor, first main contacts (KM1-2) that has first coil (KM1-1) and often open, said first main contacts (KM1-2) are connected between first end of AC power and motor winding;
Second contactor, second main contacts (KM2-2) that has second coil (KM2-1) and often open, said second main contacts (KM2-2) is connected with second end of said motor winding, is used to make said motor winding to form the Y-connection mode;
The 3rd contactor; The 3rd main contacts (KM3-2) that has tertiary coil (KM3-1) and often open; Said the 3rd main contacts (KM3-2) is connected between second end of said AC power and said motor winding, is used to make said motor winding to form the triangle connected mode;
Controller (10); Have first output, second output and the 3rd output; Said first output is connected with said first coil (KM1-1), and said second output is connected with said second coil (KM2-1), and said the 3rd output is connected with said tertiary coil (KM3-1); Said controller (10) is used to control the break-make of said first coil (KM1-1), said second coil (KM2-1) and said tertiary coil (KM3-1)
It is characterized in that:
Said the 3rd contactor also comprises normally closed first auxiliary contact (KM3-3);
Said controller (10) comprises the testing circuit that is used to detect first auxiliary contact (KM3-3) on off state, and said first auxiliary contact (KM3-3) are connected with the testing circuit of said controller (10);
Said controller (10) is controlled the break-make of first coil (KM1-1) according to the on off operating mode from said first main contacts (KM1-2) said first auxiliary contact (KM3-3) after the closed scheduled time.
8. an air conditioner comprises motor, it is characterized in that, also comprises the star triangle start circuit that is used to start said motor, and said star triangle start circuit is each described star triangle start circuit in the claim 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100302648A CN102624296A (en) | 2011-01-27 | 2011-01-27 | Star-delta starting circuit and air conditioner with same |
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| CN2011100302648A CN102624296A (en) | 2011-01-27 | 2011-01-27 | Star-delta starting circuit and air conditioner with same |
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| CN102624296A true CN102624296A (en) | 2012-08-01 |
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| CN106712644A (en) * | 2017-03-14 | 2017-05-24 | 无锡英威腾电梯控制技术有限公司 | Star-sealing loop of permanent-magnet synchronous motor, protection method and frequency converter thereof |
| CN107959443A (en) * | 2017-12-31 | 2018-04-24 | 广州市大弘自动化科技有限公司 | A kind of motor star triangle start control circuit |
| CN108872839A (en) * | 2018-04-23 | 2018-11-23 | 珠海格力电器股份有限公司 | Method, device and system for detecting pull-in fault of contactor |
| CN108879607A (en) * | 2018-07-26 | 2018-11-23 | 山东金辰机械股份有限公司 | A kind of control device and its control method of contactor for preventing adhesion |
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| CN106712644B (en) * | 2017-03-14 | 2019-02-22 | 无锡英威腾电梯控制技术有限公司 | A kind of permanent magnet synchronous motor envelope star circuit and its guard method and frequency converter |
| CN107959443A (en) * | 2017-12-31 | 2018-04-24 | 广州市大弘自动化科技有限公司 | A kind of motor star triangle start control circuit |
| CN108872839A (en) * | 2018-04-23 | 2018-11-23 | 珠海格力电器股份有限公司 | Method, device and system for detecting pull-in fault of contactor |
| CN108872839B (en) * | 2018-04-23 | 2021-05-04 | 珠海格力电器股份有限公司 | Method, device and system for detecting pull-in fault of contactor |
| CN108879607A (en) * | 2018-07-26 | 2018-11-23 | 山东金辰机械股份有限公司 | A kind of control device and its control method of contactor for preventing adhesion |
| CN108879607B (en) * | 2018-07-26 | 2024-04-30 | 山东金辰机械股份有限公司 | Anti-adhesion control device and control method for contactor |
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Application publication date: 20120801 |