CN108649530B - Temperature control weak current and strong current isolation circuit of three-phase motor - Google Patents
Temperature control weak current and strong current isolation circuit of three-phase motor Download PDFInfo
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- CN108649530B CN108649530B CN201810753943.XA CN201810753943A CN108649530B CN 108649530 B CN108649530 B CN 108649530B CN 201810753943 A CN201810753943 A CN 201810753943A CN 108649530 B CN108649530 B CN 108649530B
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- 238000002955 isolation Methods 0.000 title claims abstract description 35
- 238000002844 melting Methods 0.000 claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/50—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the appearance of abnormal wave forms, e.g. ac in dc installations
Abstract
The invention discloses a temperature-control weak current and strong current isolation circuit of a three-phase motor, which comprises an external 380V three-phase alternating current power supply, a three-phase motor M, an isolation circuit and a working circuit; the isolation circuit comprises an isolation direct-current power supply DCC, a thermosensitive element PTC, a micro relay KA and fast melting fuses FU1 and FU2; the working circuit comprises a working direct-current power supply DC, a stop button SB1, a start button SB2, a running contactor KM, a computer board IC, a normally open contact IC1 of the computer board IC and fast melting fuses FU3 and FU4. The technical scheme of the invention has the characteristics of simple structure and simple and convenient operation, skillfully increases isolation weak current, is suitable for a wide automatic control system, avoids strong current from entering a working weak current system, has strong practicability and remarkable economic and social benefits.
Description
Technical Field
The invention relates to a control circuit, in particular to a temperature-control weak current and strong current isolation circuit of a three-phase motor.
Background
The temperature controller of the motor is buried on the coil of the bridge wire of the three-phase motor by a PTC temperature control element, generally adopts a ceramic PTC thermal sensitive element at 80 ℃, is led out by two wires, and is connected in series to the weak current control loop of the three-phase motor, which is equivalent to a normally closed contact. The temperature of the coil is directly detected, when the three-phase motor is in phase failure and the load is too large, the winding is overheated, the PTC element is jumped off when the temperature exceeds 80 ℃, and the weak current control loop is disconnected, so that the protection effect of the three-phase motor is realized.
However, when severe burnout of the three-phase motor winding coil occurs, insulation between the coil L and the temperature control element PTC breaks down. At this time, the AC380V can enter a low-voltage Direct Current (DC) circuit, so that electrical equipment such as an IC computer board of the DC circuit is damaged, and great economic loss is caused.
Therefore, the temperature control weak current and strong current isolation circuit of the three-phase motor is designed, and has great economic and social significance.
Disclosure of Invention
The invention aims to design a temperature-control weak current and strong current isolation circuit of a three-phase motor, which overcomes the defects of the prior art, has simple structure, simple and convenient operation, is stable and reliable, avoids the damage of a computer board in a weak current circuit when a winding coil of the three-phase motor is seriously burnt out, prevents strong current from channeling into a low-voltage Direct Current (DC) circuit, and effectively protects electric equipment of a working circuit.
In order to achieve the purpose, the temperature control weak current and strong current isolation circuit of the three-phase motor comprises an external 380V three-phase alternating current power supply and a three-phase motor M, wherein a breaker QF1 is connected in series between the 380V three-phase alternating current power supply and the three-phase motor M; the method is characterized in that: the motor temperature control weak current and strong current isolation circuit also comprises an isolation circuit and a working circuit; the isolation circuit comprises an isolation direct-current power supply DCC, a thermosensitive element PTC, a micro relay KA and fast melting fuses FU1 and FU2; the working circuit comprises a working direct current power supply DC, a stop button SB1, a start button SB2, a running contactor KM, a computer board IC, a normally open contact IC1 of the computer board IC and insurance FU3 and FU4; each phase of power supply of the 380V three-phase alternating current power supply is respectively connected with a three-phase power supply end of the three-phase motor M in series after passing through a main contact KM1 of an operation contactor KM; the isolated direct-current power supply DCC is externally connected with a 5V direct-current power supply, and the working direct-current power supply DC is externally connected with a 12V direct-current power supply; the heat sensitive element PTC is arranged on a winding coil L inside the three-phase motor M;
the positive electrode of the 5V isolated direct current power supply DCC of the isolation circuit is respectively connected with the fast melting fuse FU1, the coil of the micro relay KA and the thermosensitive element PTC arranged in the three-phase motor M in series and then grounded; one end of the fast melting insurance FU2 is connected with the negative electrode of the 5V isolated direct current power supply DCC, and the other end of the fast melting insurance FU2 is grounded;
the positive electrode of the 12V working DC power supply DC of the working circuit is respectively connected with the insurance FU3, the stop button SB1, the start button SB2, the normally open contact IC1 of the computer board IC, the coil of the operation contactor KM and the insurance FU4 in series and then is connected with the negative electrode of the 12V working DC power supply DC; the normally open contact KM2 of the operation contactor KM is connected with a starting button SB2 in parallel; one end of the computer board IC is connected with a normally open contact KA1 of the micro relay KA in series, then is connected with the positive electrode of the 12V working direct current power supply DC after passing through the safety FU3, and the other end of the computer board IC is connected with the negative electrode of the 12V working direct current power supply DC after being connected with the safety FU4 in series; the main contact KM1 of the operation contactor KM is connected in series between the breaker QF1 and the three-phase motor M.
In the above technical scheme, the invention provides the isolation circuit between the electric devices of the strong current and weak current circuits, and when the winding coil L of the three-phase motor M is seriously burnt out, the insulation between the winding coil L and the thermosensitive element PTC is broken down. At this time, the AC380V will enter the isolation low-voltage direct current isolation circuit and be grounded, and at this time, the fast fuse FU1 or FU2 in the isolation circuit will be instantaneously fused. At this time, the coil of the micro relay KA is released after power failure, the normally open contact KA1 is opened, the computer board IC is powered off, the IC output contact is opened, and the coil of the operation contactor KM is in a power-off state, so that electrical equipment such as the IC computer board and the like is prevented from being damaged, and larger economic loss is avoided. The invention overcomes the defects of the prior art, has simple structure, is stable and reliable, avoids the damage of a computer board in a weak current circuit when the winding coil of the three-phase motor is seriously burnt out, prevents strong current from entering a low-voltage Direct Current (DC) circuit, and effectively protects the electrical equipment of a working circuit.
Drawings
Fig. 1 is a schematic circuit diagram of a temperature-controlled weak current and strong current isolation circuit of a three-phase motor according to the present invention.
Detailed Description
The temperature-controlled weak current and strong current isolation circuit of the three-phase motor is further described in detail below with reference to the accompanying drawings and examples. The accompanying drawings, which are included to provide a further understanding of the invention, illustrate and explain the invention and together with the description serve to explain the invention.
As can be seen from fig. 1, the temperature-controlled weak current and strong current isolation circuit of the three-phase motor in this embodiment includes an external 380V three-phase ac power supply, a three-phase motor M, an isolation circuit and a working circuit. In the present embodiment, a breaker QF1 is connected in series between the 380V three-phase ac power supply and the three-phase motor M. In this embodiment, each phase of power supply of 380V three-phase ac power supply is connected in series with the three-phase power supply terminal of the three-phase motor M after passing through the main contact KM1 of the operation contactor KM, respectively.
As can be seen from fig. 1, the isolation circuit of the present embodiment includes an isolated dc power supply DCC, a heat sensitive element PTC, a micro relay KA, and fast melting fuses FU1 and FU2. The isolated direct-current power supply DCC of the embodiment is externally connected with a 5V direct-current power supply, and the positive electrode of the 5V isolated direct-current power supply DCC of the isolation circuit is respectively connected with the coil of the fast melting safety FU1 and the micro relay KA in series and then grounded; one end of the fast melting fuse FU2 is connected with the negative electrode of the 5V isolated direct current power supply DCC, and the other end is grounded. The thermosensitive element PTC of the present embodiment is provided on the winding coil L inside the three-phase motor M.
As can be seen from fig. 1, the working circuit of the present embodiment includes a working DC power supply DC, a stop button SB1, a start button SB2, a running contactor KM, a computer board IC, a normally open contact IC1 of the computer board IC, and fuses FU3 and FU4. The working direct current power supply DC of this embodiment is externally connected with a 12V direct current power supply. In this embodiment, the positive electrode of the 12V DC power supply DC of the working circuit is connected in series with the safety FU3, the stop button SB1, the start button SB2, the normally open contact IC1 of the computer board IC, the coil of the operation contactor KM, and the safety FU4, respectively, and then is connected to the negative electrode of the 12V DC power supply DC. The normally open contact KM2 of the operation contactor KM is connected with the starting button SB2 in parallel, one end of the computer board IC is connected with the normally open contact KA1 of the micro relay KA in series, and then is connected with the positive electrode of the 12V working DC power supply DC after passing through the safety FU3, and the other end is connected with the negative electrode of the 12V working DC power supply DC after being connected with the safety FU4 in series. In this embodiment, the main contact KM1 of the operating contactor KM is connected in series between the circuit breaker QF1 and the three-phase motor M.
In this embodiment, when the breaker QF1 is manually turned on during normal power-on, the working DC power supply DC is turned on to the 12V power supply, and the isolated DC power supply DCC is turned on to the 5V power supply. At this time, the PTC of the thermosensitive element is in a closed state, the coil of the micro relay KA is electrified and closed, the normally open contact KA1 of the micro relay KA is closed, the computer board IC is electrified, the normally open contact IC1 of the computer board IC is closed, and the operation contactor KM is in a standby state.
When the start button SB2 is pressed, the operation contactor KM is electrified and self-locked by the main contact KM1 of the operation contactor KM, and the three-phase motor M operates. When the stop button SB1 is pressed, the coil of the operation contactor KM is deenergized, and the three-phase motor M stops operating.
In the present embodiment, when severe burnout occurs in the winding coil L of the three-phase motor M, insulation between the winding coil L and the thermosensitive element PTC breaks down. At this point, AC380V will blow into the isolation circuit and ground, at which point the isolation circuit fuse FU1 or FU2 will blow momentarily. At this time, the coil of the micro relay KA is released when the power is lost, the normally open contact KA1 of the micro relay KA is opened, the computer board IC is powered off, the normally open contact IC1 of the computer board IC is opened, and the operation contactor KM is in a power-off state. Thereby ensuring that electrical equipment such as computer board ICs and the like are prevented from being damaged and avoiding larger economic loss.
In the embodiment, the micro relay KA is used for the relay, so that the relay can bear strong current impact better than the photoelectric coupler and the solid relay, and electrical equipment such as a computer board IC and the like in a weak current part is prevented from being damaged.
The embodiment has the characteristics of simple structure and simple and convenient operation, skillfully adds the isolation circuit, is suitable for a wide automatic control system, avoids strong current from entering a working weak current system, has higher practicability and remarkable economic and social benefits.
The foregoing is merely an embodiment of the present invention, and the present invention is not limited thereto, and any simple modification, variation and equivalent method of the foregoing embodiment according to the technical matter of the present invention still falls within the scope of the technical solution of the present invention.
Claims (1)
1. The motor temperature control weak current and strong current isolation circuit comprises an external 380V three-phase alternating current power supply and a three-phase motor M, wherein a breaker QF1 is connected in series between the 380V three-phase alternating current power supply and the three-phase motor M; the method is characterized in that: the motor temperature control weak current and strong current isolation circuit also comprises an isolation circuit and a working circuit; the isolation circuit comprises an isolation direct-current power supply DCC, a thermosensitive element PTC, a micro relay KA and fast melting fuses FU1 and FU2; the working circuit comprises a working direct current power supply DC, a stop button SB1, a start button SB2, a running contactor KM, a computer board IC, a normally open contact IC1 of the computer board IC and insurance FU3 and FU4; each phase of power supply of the 380V three-phase alternating current power supply is respectively connected with a three-phase power supply end of the three-phase motor M in series after passing through a main contact KM1 of an operation contactor KM; the isolated direct-current power supply DCC is externally connected with a 5V direct-current power supply, and the working direct-current power supply DC is externally connected with a 12V direct-current power supply; the heat sensitive element PTC is arranged on a winding coil L inside the three-phase motor M;
the positive electrode of the 5V isolated direct current power supply DCC of the isolation circuit is respectively connected with the fast melting fuse FU1, the coil of the micro relay KA and the thermosensitive element PTC arranged in the three-phase motor M in series and then grounded; one end of the fast melting insurance FU2 is connected with the negative electrode of the 5V isolated direct current power supply DCC, and the other end of the fast melting insurance FU2 is grounded;
the positive electrode of the 12V working DC power supply DC of the working circuit is respectively connected with the insurance FU3, the stop button SB1, the start button SB2, the normally open contact IC1 of the computer board IC, the coil of the operation contactor KM and the insurance FU4 in series and then is connected with the negative electrode of the 12V working DC power supply DC; the normally open contact KM2 of the operation contactor KM is connected with a starting button SB2 in parallel; one end of the computer board IC is connected with a normally open contact KA1 of the micro relay KA in series, then is connected with the positive electrode of the 12V working direct current power supply DC after passing through the safety FU3, and the other end of the computer board IC is connected with the negative electrode of the 12V working direct current power supply DC after being connected with the safety FU4 in series; the main contact KM1 of the operation contactor KM is connected in series between the breaker QF1 and the three-phase motor M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810753943.XA CN108649530B (en) | 2018-07-11 | 2018-07-11 | Temperature control weak current and strong current isolation circuit of three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810753943.XA CN108649530B (en) | 2018-07-11 | 2018-07-11 | Temperature control weak current and strong current isolation circuit of three-phase motor |
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| Publication Number | Publication Date |
|---|---|
| CN108649530A CN108649530A (en) | 2018-10-12 |
| CN108649530B true CN108649530B (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810753943.XA Active CN108649530B (en) | 2018-07-11 | 2018-07-11 | Temperature control weak current and strong current isolation circuit of three-phase motor |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2015596C1 (en) * | 1991-07-02 | 1994-06-30 | Леонид Петрович Дмитренко | Electric motor protection device |
| CN2205076Y (en) * | 1993-03-09 | 1995-08-09 | 金大奎 | Universal solid three phase motor protector |
| CN2255690Y (en) * | 1996-01-12 | 1997-06-04 | 沈骊天 | Electric motor protector |
| CN2311889Y (en) * | 1996-10-18 | 1999-03-24 | 刘志华 | Controller for electric machine |
| CN2512147Y (en) * | 2001-10-30 | 2002-09-18 | 赵峰 | Electric motor starting protector for small air compressor |
| CN2857066Y (en) * | 2005-05-12 | 2007-01-10 | 岳阳华强电力电子有限公司 | Conversion air conditioning electrical system of bus |
| CN204441852U (en) * | 2015-02-05 | 2015-07-01 | 上海和宗焊接设备制造有限公司 | A kind of three-phase overvoltage, under-voltage, phase shortage integrated protective circuit |
| CN204732855U (en) * | 2015-07-22 | 2015-10-28 | 金陵科技学院 | A kind of motor over-temperature controller |
| CN205004732U (en) * | 2015-10-16 | 2016-01-27 | 介国安 | Contactless relay protection ware of intelligent motor power isolation |
| CN106340855A (en) * | 2016-05-22 | 2017-01-18 | 湖南吉利汽车部件有限公司 | Relay protection control device for motor |
| CN108120872A (en) * | 2017-12-27 | 2018-06-05 | 奥克斯空调股份有限公司 | A kind of protection system and method for three-phase electricity air-conditioner controller |
| CN208479171U (en) * | 2018-07-11 | 2019-02-05 | 安徽华茂纺织股份有限公司 | A kind of threephase motor temperature control light current and forceful electric power isolation circuit |
-
2018
- 2018-07-11 CN CN201810753943.XA patent/CN108649530B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2015596C1 (en) * | 1991-07-02 | 1994-06-30 | Леонид Петрович Дмитренко | Electric motor protection device |
| CN2205076Y (en) * | 1993-03-09 | 1995-08-09 | 金大奎 | Universal solid three phase motor protector |
| CN2255690Y (en) * | 1996-01-12 | 1997-06-04 | 沈骊天 | Electric motor protector |
| CN2311889Y (en) * | 1996-10-18 | 1999-03-24 | 刘志华 | Controller for electric machine |
| CN2512147Y (en) * | 2001-10-30 | 2002-09-18 | 赵峰 | Electric motor starting protector for small air compressor |
| CN2857066Y (en) * | 2005-05-12 | 2007-01-10 | 岳阳华强电力电子有限公司 | Conversion air conditioning electrical system of bus |
| CN204441852U (en) * | 2015-02-05 | 2015-07-01 | 上海和宗焊接设备制造有限公司 | A kind of three-phase overvoltage, under-voltage, phase shortage integrated protective circuit |
| CN204732855U (en) * | 2015-07-22 | 2015-10-28 | 金陵科技学院 | A kind of motor over-temperature controller |
| CN205004732U (en) * | 2015-10-16 | 2016-01-27 | 介国安 | Contactless relay protection ware of intelligent motor power isolation |
| CN106340855A (en) * | 2016-05-22 | 2017-01-18 | 湖南吉利汽车部件有限公司 | Relay protection control device for motor |
| CN108120872A (en) * | 2017-12-27 | 2018-06-05 | 奥克斯空调股份有限公司 | A kind of protection system and method for three-phase electricity air-conditioner controller |
| CN208479171U (en) * | 2018-07-11 | 2019-02-05 | 安徽华茂纺织股份有限公司 | A kind of threephase motor temperature control light current and forceful electric power isolation circuit |
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| Publication number | Publication date |
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| CN108649530A (en) | 2018-10-12 |
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