CN2278296Y - Overcurrent and overheat protector for rareearth permanent magnet industrial-frequency three-phase ac generator - Google Patents
Overcurrent and overheat protector for rareearth permanent magnet industrial-frequency three-phase ac generator Download PDFInfo
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- CN2278296Y CN2278296Y CN 96236336 CN96236336U CN2278296Y CN 2278296 Y CN2278296 Y CN 2278296Y CN 96236336 CN96236336 CN 96236336 CN 96236336 U CN96236336 U CN 96236336U CN 2278296 Y CN2278296 Y CN 2278296Y
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- circuit
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- output
- switch
- permanent magnet
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Abstract
The utility model relates to an over current and overheating protector for rare earth and permanent magnet AC generators with industrial frequency and three phases, comprising a power supply K, a power supply circuit, a current sampling circuit, a temperature sensor, a control circuit, and a control switch. The A phase current sampling circuit, the B phase current sampling circuit, and the C phase current sampling circuit of the current sampling circuit are respectively connected with the A phase switch circuit, the B phase switch circuit, and the C phase switch circuit of the control circuit. The output ed of the temperature sensor is connected with an overheating switch circuit of the control circuit. The switching on or the switching off of the control switch is controlled through the control output circuit of the control circuit to make the generator can not be damaged by over current and overheating. The utility model has the advantages of simple structure, safety, etc. The utility model can also be used in other generators with one phase and generators with three phases or motors.
Description
The utility model belongs to when the undesirable variation of normal running conditions occurring departing from can finish emergency protective circuit device technique field automatic switchover, that be exclusively used in specific type of electric machine or electric equipment, relates to specifically to be used for electronic equipment.
On the rare earth permanent magnet power frequency threephase alternator excess-current excess-temperature protective device is not set; in use; often excessive because of the power of electrical appliance; or make that the excessive temperature of this generator that causes of this generator output current is too high because of other reason; or cause the temperature of this generator too high because of other reason; and this generator operate as normal requires the temperature of this generator to be controlled in 0～90 ℃ the scope; surpass this temperature range; this generator will be demagnetized; when if the temperature of this motor surpasses 120 ℃; this generator is scrapped because of magnetic disappears, and has brought the certain economic loss to the user.
The purpose of this utility model is to overcome the shortcoming of above-mentioned generator, for above-mentioned generator provides a kind of excess-current excess-temperature protective device.
For achieving the above object, the solution that the utility model adopts is: it comprises mains switch K, power circuit, current sampling circuit, temperature sensor, control circuit, control switch.The input of mains switch K, control switch and power circuit is connected on the rare earth permanent magnet power frequency threephase alternator output line, the current transformer of current sampling circuit is installed on the output line of rare earth permanent magnet power frequency threephase alternator, temperature sensor is arranged on the rare earth permanent magnet power frequency threephase alternator, the output connection control circuit of power circuit, the input of the output connection control circuit of temperature sensor and current sampling circuit, the output termination control switch of control circuit.Current sampling circuit of the present utility model comprises A phase current sample circuit, B phase current sample circuit, C phase current sample circuit, the current transformer of A phase current sample circuit, B phase current sample circuit, C phase current sample circuit is installed in output line A phase, B phase, the C phase of rare earth permanent magnet power frequency threephase alternator respectively, the input of the output connection control circuit of A phase current sample circuit and B phase current sample circuit and C phase current sample circuit.Control circuit of the present utility model is by the A phase switch circuit, the B phase switch circuit, the C phase switch circuit, excess temperature switching circuit and controlling output circuit connect and compose, the output of the A phase current sample circuit of the input termination current sampling circuit of A phase switch circuit, the output of the B phase current sample circuit of the input termination current sampling circuit of B phase switch circuit, the output of the C phase current sample circuit of the input termination current sampling circuit of C phase switch circuit, the output of the input jointing temp transducer of excess temperature switching circuit, the A phase switch circuit, the B phase switch circuit, the C phase switch circuit, the input of the output termination controlling output circuit of excess temperature switching circuit, the output termination control switch of controlling output circuit.
The components and parts that the A phase current sample circuit of the utility model current sampling circuit, B phase current sample circuit, C phase current sample circuit are used and the annexation of components and parts are identical.The components and parts that A phase switch circuit in the utility model control circuit, B phase switch circuit, C phase switch circuit are used and the annexation of components and parts are identical.
The A phase current sample circuit of the utility model current sampling circuit is: current transformer LM
1Be installed in the output line A phase of rare earth permanent magnet power frequency threephase alternator, the input of output termination bridge rectifier, the output termination filter capacitor C of bridge rectifier
1, C
2
Temperature sensor of the present utility model adopts thermistor R
t
The utlity model has advantages such as simple in structure, safe and reliable, can be used for also can be used on other alternating current generator and the motor on the rare earth permanent magnet industrial frequency AC generator.
Fig. 1 is an electrical principle block diagram of the present utility model.
Fig. 2 is the electrical schematic diagram of an embodiment of the utility model.
Below in conjunction with drawings and Examples the utility model is further described.
In Fig. 1, turn on the power switch K, the input of electricity that rare earth permanent magnet power frequency threephase alternator sends is after mains switch K, control switch, output on the electrical appliance, and electrical appliance is in running order, power circuit is connected simultaneously, for control circuit provides working power.When electrical appliance has super-high-current to pass through, the signal that current sampling circuit is responded to from rare earth permanent magnet industrial frequency AC generator output line is input to control circuit through after this processing of circuit, the drive controlling switch disconnects, and this generator stops output, makes this generator avoid the infringement of overcurrent.When the temperature of rare earth permanent magnet power frequency threephase alternator is too high, temperature sensor is input to control circuit from the excess temperature signal that rare earth permanent magnet industrial frequency AC generator receives after conversion, the drive controlling switch disconnects, and this generator stops output, makes this generator avoid the infringement of excess temperature.
In Fig. 2, be connected with mains switch K, power circuit and control switch on the output line of rare earth permanent magnet power frequency threephase alternator.
The power circuit of present embodiment is by fuse RD
2, transformer B, D
1～4, integrated stable voltage circuit 7812, C
3, C
4Connect and compose D
1～4Connect into bridge rectifier, the elementary end of transformer B is by fuse RD
2Connect rare earth permanent magnet power frequency threephase alternator output line A phase behind the mains switch K, termination B phase in addition, the secondary input that connects bridge rectifier, the output termination C of bridge rectifier
3, C
4And the input of integrated stable voltage circuit 7812, the output of integrated stable voltage circuit 7812 is connected with control circuit.Power circuit provides working power for control circuit.
The current sampling circuit of present embodiment comprises A phase current sample circuit, B phase current sample circuit, C phase current sample circuit.A phase current sample circuit is by current transformer LM
1, D
5～8, C
1, C
2Connect and compose.D
5～8Connect into bridge rectifier, current transformer LM
1Be installed in the input of rare earth permanent magnet power frequency threephase alternator output line A phase, output termination bridge rectifier, the output termination filter capacitor C of bridge rectifier
1, C
2, the output connection control circuit of A phase current sample circuit.Current transformer LM
1The AC signal that receives outputs to control circuit behind rectifying and wave-filtering.B phase current sample circuit is by current transformer LM
2, D
9～12, C
6, C
7Connect and compose, C phase current sample circuit is by current transformer LM
3, D
13～16, C
10, C
11Connect and compose, the components and parts of B phase current sample circuit, C phase current sample circuit and the annexation of components and parts are identical with A phase current sample circuit.
The temperature sensor of present embodiment adopts thermistor R
t, be installed on the coil of rare earth permanent magnet power frequency threephase alternator thermistor R
tA termination positive pole of stabilized voltage supply, other end connection control circuit, thermistor R
tThe temperature signal of the rare earth permanent magnet power frequency threephase alternator coil that receives is converted to the signal of telecommunication outputs to control circuit.
The control circuit of present embodiment is by A, B, C phase switch circuit, and excess temperature switching circuit, controlling output circuit connect and compose.The A phase switch circuit is by BG
1, D
17, W
1, R
1, R
2, C
5Connect and compose W
1Output, the termination D in addition of a termination A phase current sample circuit
17Positive pole and R
1An end, D
17Negative pole and BG
1Base stage and C
5An end connect R
1The other end and C
5Another termination stabilized voltage power supply negative pole, BG
1Collector electrode pass through R
2Connect positive pole of stabilized voltage supply and controlling output circuit.The B phase switch circuit is by BG
2, D
18, W
2, R
2, R
3, C
8Connect and compose, the C phase switch circuit is by BG
3, D
19, W
3, R
2, R
4, C
9Connect and compose, the excess temperature switching circuit is by BG
4, D
20, R
2, R
5, C
12Connect and compose.B phase switch circuit input W
2The output of a termination B phase current sample circuit, C phase switch circuit input W
3The output of a termination C phase current sample circuit, the output termination controlling output circuit of B, C phase switch circuit, the components and parts that B, C phase switch circuit are used and the annexation of components and parts are identical with the A phase switch circuit.The input D of excess temperature switching circuit
20Positive pole and R
5A termination thermistor R
tThe other end, D
20Negative pole and BG
4Base stage and C
12An end connect R
5And C
12Another termination stabilized voltage power supply negative pole, BG
4Collector electrode pass through R
2Connect positive pole of stabilized voltage supply and controlling output circuit.Controlling output circuit is by integrated circuit NE555, D
21, D
22, R
6, C
13, C
14, relay J
2Connect and compose.2 pin and 6 pin of integrated circuit NE555 meet BG
1, BG
2, BG
3, BG
4Collector electrode and C
13An end, 4 pin and 8 pin connect that positive pole of stabilized voltage supply, 1 pin connect the stabilized voltage power supply negative pole, 5 pin meet C
14An end, 3 pin meet D
21And D
22Negative pole and relay J
2One end of coil, C
13And C
14The other end, D
21Positive pole and relay J
2Another termination stabilized voltage power supply negative pole of coil, D
22Positive pole pass through R
6Connect positive pole of stabilized voltage supply, relay J
2Normally-closed contact J
2K
1A termination control switch, another termination mains switch K after the output line A phase of this motor.
The control switch of present embodiment is by often opening button DN
1Normally closed button DN
2, A.C. contactor J
1, fuse RD
1Connect and compose.Normally closed button DN
2A contact and control circuit relay J
2Normally-closed contact J
2K
1Contact connect relay J
2Normally-closed contact J
2K
1Another contact connect rare earth permanent magnet power frequency threephase alternator output line A phase, often open button DN
1Contact and A.C. contactor J
1One end of coil connects, A.C. contactor J
1Normally opened contact J
1K
4Two contacts with often open button DN
1With normally closed button DN
2Another contact connect A.C. contactor J
1The other end of coil and fuse RD
1Connect the back and be connected A.C. contactor J with the output line C of rare earth permanent magnet power frequency threephase alternator
1Normally opened contact J
1K
1, J
1K
2, J
1K
3A contact meet rare earth permanent magnet power frequency threephase alternator output line A, B, C phase, A.C. contactor J respectively
1Normally opened contact J
1K
1, J
1K
2, J
1K
3Another contact connect electrical appliance.When control switch was used for when the electric current of rare earth permanent magnet power frequency threephase alternator output that excessive or temperature is too high, control switch disconnected, and this generator stops output.
The operation principle of present embodiment is as follows:
Closed mains switch K, when the moment of mains switch K closure, 2,6 pin of integrated circuit NE555 are electronegative potential, and at this moment, the circuit of electrical appliance is not connected, and stabilized voltage power supply is through R
2Give C
13Charging, the time is 2 seconds, input 2,6 pin of integrated circuit NE555 become high potential, at this moment by often opening button DN
1, electrical appliance enters operating state.Too much when the electrical appliance electricity consumption, when the electric current of the rare earth permanent magnet power frequency of flowing through threephase alternator output line A (or B, C) phase was excessive, A (or B, C) phase current sample circuit was exported to the BG of A (or B, C) phase switch circuit of control circuit
1(or BG
2, BG
3) Continuity signal, BG be provided
1(or BG
2, BG
3) be switched on, 2 pin of integrated circuit NE555 and 6 pin are that electronegative potential, 3 pin are high potential, relay J
2Work, relay J
2Normally-closed contact J
2K
1Be disconnected, cut off A.C. contactor J
1The coil both end voltage, A.C. contactor J
1Normally opened contact J
1K
1, J
1K
2, J
1K
3Disconnect, rare earth permanent magnet power frequency threephase alternator stops output, makes this generator avoid being damaged because of overcurrent.When the temperature of rare earth permanent magnet power frequency threephase alternator coil is too high, thermistor R
tResistance diminish the BG of the excess temperature switching circuit of control circuit
4Be switched on, 2 pin of integrated circuit NE555 and 6 pin are that electronegative potential, 3 pin are high potential, relay J
2Work, relay J
2Normally-closed contact J
2K
1Be disconnected, cut off A.C. contactor J
1The coil both end voltage, A.C. contactor J
1Normally opened contact J
1K
1, J
1K
2, J
1K
3Disconnect, rare earth permanent magnet power frequency threephase alternator stops output, makes this generator avoid being damaged because of excess temperature.When the temperature of the electric current of rare earth permanent magnet power frequency threephase alternator output and this generator coil just often, the input voltage of A phase, B phase, C phase switch circuit that A phase current sample circuit, B phase current sample circuit, C phase current sample circuit output to control circuit is low, BG
1, BG
2, BG
3Not conducting, thermistor R
tResistance bigger, make the BG of the excess temperature switching circuit of control circuit
4Not conducting, 2 pin of integrated circuit NE555 and 6 pin are that high potential, 3 pin are electronegative potential, relay J
2Do not work relay J
2Normally-closed contact J
2K
1Closure, the A.C. contactor J of control switch
1Normally opened contact J
1K
1, J
1K
2, J
1K
3Conducting, rare earth permanent magnet power frequency threephase alternator is normally exported.
Also can go out the rare earth permanent magnet power frequency threephase alternator excess-current excess-temperature protective device of another concrete structure according to above-mentioned principle design.
Claims (4)
1; a kind of rare earth permanent magnet power frequency threephase alternator excess-current excess-temperature protective device; it comprises mains switch K; power circuit; current sampling circuit; temperature sensor; control circuit; control switch; mains switch K; control switch; and the input of power circuit is connected on the rare earth permanent magnet power frequency threephase alternator output line; the current transformer of current sampling circuit is installed on the output line of rare earth permanent magnet power frequency threephase alternator; temperature sensor is arranged on the rare earth permanent magnet power frequency threephase alternator; the output connection control circuit of power circuit; the input of the output connection control circuit of temperature sensor and current sampling circuit; the output termination control switch of control circuit is characterized in that:
Above-mentioned current sampling circuit comprises A phase current sample circuit, B phase current sample circuit, C phase current sample circuit, the current transformer of A phase current sample circuit, B phase current sample circuit, C phase current sample circuit is installed in output line A phase, B phase, the C phase of rare earth permanent magnet power frequency threephase alternator respectively, the input of the output connection control circuit of A phase current sample circuit and B phase current sample circuit and C phase current sample circuit;
Above-mentioned control circuit is by the A phase switch circuit, the B phase switch circuit, the C phase switch circuit, excess temperature switching circuit and controlling output circuit connect and compose, the output of the A phase current sample circuit of the input termination current sampling circuit of A phase switch circuit, the output of the B phase current sample circuit of the input termination current sampling circuit of B phase switch circuit, the output of the C phase current sample circuit of the input termination current sampling circuit of C phase switch circuit, the output of the input jointing temp transducer of excess temperature switching circuit, the A phase switch circuit, the B phase switch circuit, the C phase switch circuit, the input of the output termination controlling output circuit of excess temperature switching circuit, the output termination control switch of controlling output circuit.
2, according to the described rare earth permanent magnet power frequency of claim 1 threephase alternator excess-current excess-temperature protective device, it is characterized in that: the components and parts that the A phase current sample circuit of said current sampling circuit, B phase current sample circuit, C phase current sample circuit are used and the annexation of components and parts are identical; The components and parts that A phase switch circuit in the said control circuit, B phase switch circuit, C phase switch circuit are used and the annexation of components and parts are identical.
3, according to claim 1 or 2 described rare earth permanent magnet power frequency threephase alternator excess-current excess-temperature protective devices, it is characterized in that the A phase current sample circuit of said current sampling circuit is: current transformer LM
1Be installed in the output line A phase of rare earth permanent magnet power frequency threephase alternator, the input of output termination bridge rectifier, the output termination filter capacitor C of bridge rectifier
1, C
2
4, according to the described rare earth permanent magnet power frequency of claim 1 threephase alternator excess-current excess-temperature protective device, it is characterized in that: said temperature sensor is thermistor R
t
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96236336 CN2278296Y (en) | 1996-10-15 | 1996-10-15 | Overcurrent and overheat protector for rareearth permanent magnet industrial-frequency three-phase ac generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96236336 CN2278296Y (en) | 1996-10-15 | 1996-10-15 | Overcurrent and overheat protector for rareearth permanent magnet industrial-frequency three-phase ac generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2278296Y true CN2278296Y (en) | 1998-04-08 |
Family
ID=33912187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96236336 Expired - Fee Related CN2278296Y (en) | 1996-10-15 | 1996-10-15 | Overcurrent and overheat protector for rareearth permanent magnet industrial-frequency three-phase ac generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2278296Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015081576A1 (en) * | 2013-12-07 | 2015-06-11 | 湖南省凯盈科技有限公司 | Electrically chargeable overtemperature/overcurrent protection module |
-
1996
- 1996-10-15 CN CN 96236336 patent/CN2278296Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015081576A1 (en) * | 2013-12-07 | 2015-06-11 | 湖南省凯盈科技有限公司 | Electrically chargeable overtemperature/overcurrent protection module |
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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 |