CN2442435Y - Motor prector only detecting two phase current - Google Patents
Motor prector only detecting two phase current Download PDFInfo
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- CN2442435Y CN2442435Y CN 00251205 CN00251205U CN2442435Y CN 2442435 Y CN2442435 Y CN 2442435Y CN 00251205 CN00251205 CN 00251205 CN 00251205 U CN00251205 U CN 00251205U CN 2442435 Y CN2442435 Y CN 2442435Y
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Abstract
The utility model relates to a motor protector for only detecting two-phase current. The existing protector carries out the judgment of over current and phase failure through the test to each phase current of an electric appliance and has complicated structure, large volume and high cost. The product comprises a casing, wherein the inner part of the casing is provided with two mutual inductor coils which are respectively inductive with a tested motor and two signal conversion devices which are composed of impedance components connected in parallel with the mutual inductor coils. One end of each of the two signal conversion devices passes through two diodes and is connected with an over current protection device comprising a comparator A. The output end of the comparator A is connected with a gate circuit. The product is used for the protection of over current or phase failure of a three-phase motor, etc.
Description
The utility model relates to a kind of protective device of induction type electromechanical equipment, particularly overcurrent protection and phase failure protector.
Existing protector is by overcurrent being carried out in the test of each phase current of electrical equipment and phase shortage is judged, its complex structure, and volume is big, cost is high.
The purpose of this utility model is to provide a kind of motor protecter that detects biphase current, and is simple in structure, volume is little, cost is low, can bring convenience to operation and maintenance.
The purpose of this utility model is achieved in that
Only detect the motor protecter of biphase current; its composition comprises: shell; two mutual inductor coils with detected motor induction are installed in the described shell respectively; two chromacoders that the impedance component in parallel with described mutual inductor coil constitutes; one end of these two chromacoders all links to each other with the overcurrent protective device that comprises comparator A behind two diodes, and the output AND circuit of this comparator A links to each other.
The above-mentioned motor protecter that only detects biphase current, described overcurrent protective device comprise comparator A and are installed in the adjustable resistance of the setting protective current on this comparator A.
The above-mentioned motor protecter that only detects biphase current is connected with open phase protection between described two diodes, comprising:
One end of described chromacoder links to each other with the negative level of comparator B or comparator C, and the output of described comparator links to each other with described gate circuit,
The other end of described chromacoder links to each other with the circuit of resistance series connection with the series circuit or the comparator B of resistance with comparator C, and the output of described comparator links to each other with described gate circuit,
One end of described two mutual inductor coils is equipped with the phase-shift discriminator that is made of impedance component.
The above-mentioned motor protecter that only detects biphase current; described phase-shift discriminator comprises behind resistance respectively two circuit that input links to each other with differential amplifier; the two ends of this differential amplifier link to each other by divider resistance; and the output of this differential amplifier links to each other with the open-phase protection circuit of phase shortage; the open-phase protection circuit of this phase shortage comprises; the current rectifying and wave filtering circuit that diode and electric capacity are formed, insert the input of comparator D behind divider resistance, the output of described comparator D links to each other with described gate circuit.
Advantage of the present utility model is:
Only by electrical equipment wherein arbitrarily the induction of biphase current whether just can judge in its three-phase the phase failure and overcurrent, simple in structure, cost is low, volume is little, bring very large convenience to operation and maintenance.
2. judge by the NAND gate circuit that is provided with four inputs that when in arbitrary decision circuitry wherein during the output high level, the output of gate circuit is high level, and cuts off appliance circuit in view of the above.
3. can realize overcurrent protection.When the anode electric current of comparator A surpassed the rated current of controlling by variable resistor, comparator A exported high level, can cause the gate circuit high level, cut off appliance circuit and realized overcurrent protection.
4. can realize the open phase protection of sensed phase.Comparator B is used for judging and is subjected to a wherein whether phase failure mutually of sensor circuit, for example two divider resistances of input are got equivalence, when promptly the positive terminal voltage of the input of comparator B is 1/2 Uc, Uc with become the Ic direct ratio, negative terminal voltage is Ua, and Ua also is the voltage signal that is proportional to Ia.In the time of the normal operation of motor, Ic ≈ Ia, and Ua＞1/2Uc, comparator B output low level.If the phase failure of A phase, Ia=0, Ua=0 then, C does not have then Uc＞0 of the phase failure mutually, Ua＜1/2Uc then, comparator B exports high level, then cuts off appliance circuit by gate circuit.
The open phase protection operation principle of comparator C is the same.
5. compare for the two-phase of responding to (A phase, C phase) signal by phase-shift discriminator, distinguishing the whether phase failure of its another phase (B phase), and controlled.When three phase electric machine moves just often, phase phasic difference 120 degree of the output signal of telecommunication on the current transformer La summation current transformer Lc, constitute identification device by differential amplifier and adjustment resistance on every side thereof, carrying out difference with the difference of the different sinusoidal signal of these two phase places that obtain for induction amplifies, differential amplifier is non-zero output since the anode of comparator D near " " potential comparator D output low level.If the B phase phase failure; be output as same-phase on the current transformer La summation current transformer Lc, so differential amplifier is output as zero, the output voltage that causes comparator D thus is a high level; device cuts off drive circuit by the output of gate circuit in view of the above, reaches the purpose of protection motor.
Accompanying drawing 1 is a structural representation of the present utility model.Accompanying drawing 2 is a kind of electrical schematic diagrams of realizing this product.
Be further described below in conjunction with accompanying drawing:
Embodiment 1:
Only detect the motor protecter of biphase current; its composition comprises: shell 1; two mutual inductor coil La and Lc with detected motor induction are installed in the described shell respectively; two chromacoders that the impedance component in parallel with described mutual inductor coil constitutes; comprise: with La parallel resistor R1; with Lc parallel resistor R2; end at chromacoder La; diode D1 link to each other with the overcurrent protective device that comprises comparator A with D5 (being connected on the positive pole of input of described comparator A); the end diode D2 of chromacoder Lc links to each other with the overcurrent protective device that comprises comparator A with D4 (also being connected on the positive pole of input of described comparator A), and the output AND circuit U of this comparator A links to each other.
Embodiment 2:
1 described of embodiment detects the motor protecter of biphase current, and described overcurrent protective device comprises comparator A and is installed in the adjustable resistance W1 that is used to set protective current on the negative pole of this comparator A.
Embodiment 3:
Embodiment 1 or 2 described motor protecters that detect biphase current are connected with open phase protection between described second tube sheet D1 and D5 and diode D2 and the D4, comprising:
An end that has the chromacoder of La links to each other with the negative level of comparator B, and an end that has the chromacoder of coil Lc links to each other with the negative level of comparator C.
The chromacoder that has a La coil links to each other, has the Lc coil by the resistance R 9 and the anode of described another comparator C chromacoder links to each other with the anode of described comparator C by resistance R 10.
The two ends that have the chromacoder of Lc coil link to each other with described anode than device B with resistance R 12 by resistance R 11 respectively.
Described comparator B and comparator C output link to each other with described gate circuit U.
On the signaling conversion circuit that has a La and the circuit that diode D1 contacts mutually, the resistance-capacitance circuit that has capacitor C 1, resistance R 7 in parallel.
On the signaling conversion circuit that has a Lc and the circuit that diode D2 contacts mutually, the resistance-capacitance circuit that has capacitor C 2, resistance R 8 in parallel.
One end of described two mutual inductor coils, the phase-shift discriminator 2 that is made of impedance component is housed, the resistance R 4 that the resistance R 6 that the negative pole that comprises resistance R 3 that the other end that links to each other with the Lc coil links to each other with the differential amplifier input cathode, two ends and differential amplifier and output link to each other respectively, the other end that links to each other with the La coil link to each other with the differential amplifier input anode, the resistance R 5 that an end links to each other with an other end of the chromacoder of band La coil, the other end of this resistance R 5 links to each other with the differential amplifier input anode.Through behind the above-mentioned resistance R 3-R6; the output of this phase-shift discriminator links to each other with the open-phase protection circuit of phase shortage; the open-phase protection circuit of this phase shortage comprises; the current rectifying and wave filtering circuit that diode D3 and capacitor C 3 are formed, the input that behind divider resistance R14 and R15, inserts comparator D; the negative terminal of the input of this comparator D links to each other with described diode D3 output, and the output of described comparator D links to each other with described gate circuit.
Claims (4)
1. motor protecter that only detects biphase current; its composition comprises: shell; it is characterized in that: two mutual inductor coils with detected motor induction are installed in the described shell respectively; two chromacoders that the impedance component in parallel with described mutual inductor coil constitutes; one end of these two chromacoders all links to each other with the overcurrent protective device that comprises comparator A behind two diodes, and the output AND circuit of this comparator A links to each other.
2. according to claim 1 motor protecter that detects biphase current is characterized in that: described overcurrent protective device comprises comparator A and is installed in the adjustable resistance of the setting protective current on this comparator A.
3. according to claim 1 and 2 motor protecter that detects biphase current is characterized in that: be connected with open phase protection between described two diodes, comprising:
One end of described chromacoder links to each other with the negative pole of comparator B or comparator C, and the output of described comparator links to each other with described gate circuit,
The other end of described chromacoder links to each other with the circuit of resistance series connection with the series circuit or the comparator B of resistance with comparator C, and the output of described comparator links to each other with described gate circuit,
One end of described two mutual inductor coils is equipped with the phase-shift discriminator that is made of impedance component.
4. according to claim 3 motor protecter that detects biphase current; it is characterized in that: described phase-shift discriminator comprises behind resistance respectively two circuit that input links to each other with differential amplifier; the two ends of this differential amplifier link to each other by divider resistance; and the output of this differential amplifier links to each other with the open-phase protection circuit of phase shortage; the open-phase protection circuit of this phase shortage comprises; the current rectifying and wave filtering circuit that diode and electric capacity are formed, insert the input of comparator D behind divider resistance, the output of described comparator D links to each other with described gate circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00251205 CN2442435Y (en) | 2000-09-01 | 2000-09-01 | Motor prector only detecting two phase current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00251205 CN2442435Y (en) | 2000-09-01 | 2000-09-01 | Motor prector only detecting two phase current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2442435Y true CN2442435Y (en) | 2001-08-08 |
Family
ID=33609201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00251205 Expired - Fee Related CN2442435Y (en) | 2000-09-01 | 2000-09-01 | Motor prector only detecting two phase current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2442435Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004624A (en) * | 2018-09-14 | 2018-12-14 | 北京安润通电子技术开发有限公司 | A kind of the open phase detection module and its application method of three-phase point machine |
| CN110426550A (en) * | 2019-08-16 | 2019-11-08 | 北京机械设备研究所 | A kind of high-power electric steering engine overcurrent protection signal high speed generating means and method |
-
2000
- 2000-09-01 CN CN 00251205 patent/CN2442435Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004624A (en) * | 2018-09-14 | 2018-12-14 | 北京安润通电子技术开发有限公司 | A kind of the open phase detection module and its application method of three-phase point machine |
| CN109004624B (en) * | 2018-09-14 | 2023-07-14 | 北京安润通电子技术开发有限公司 | Open-phase detection module of three-phase turnout point machine and application method thereof |
| CN110426550A (en) * | 2019-08-16 | 2019-11-08 | 北京机械设备研究所 | A kind of high-power electric steering engine overcurrent protection signal high speed generating means and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |