KR200161724Y1 - The power saving and power factor improving apparatus of a motor - Google Patents
The power saving and power factor improving apparatus of a motor Download PDFInfo
- Publication number
- KR200161724Y1 KR200161724Y1 KR2019970003766U KR19970003766U KR200161724Y1 KR 200161724 Y1 KR200161724 Y1 KR 200161724Y1 KR 2019970003766 U KR2019970003766 U KR 2019970003766U KR 19970003766 U KR19970003766 U KR 19970003766U KR 200161724 Y1 KR200161724 Y1 KR 200161724Y1
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- South Korea
- Prior art keywords
- power
- current
- capacitor
- load
- triac
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/26—Power factor control [PFC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
- H02P2201/15—Power factor Correction [PFC] circuit generating the DC link voltage for motor driving inverter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Electrical Variables (AREA)
Abstract
본 고안은 유도전동기의 소모전력절감 및 역률개선기에 관한 것으로 유도전동기에 병렬로 설치되는 캐패시터를 입력 전압 영전위에서 연결시켜 다음 반 싸이클에서 흐르려는 전류 즉 전압과 전류의 극성이 반대인 무효 전류를 차단시켜 입력전압이 영전위에서 전류를 차단하는 순간 부하가 가지고 있는 에너지를 캐패시터로 방출시키므로서 극성이 반대인 다음 반 싸이클에서 전류가 원활히 흐를수 있도록 구성하여 무효 전력(SIN θ)을 없애서 실효 전류를 감소시키는 것이다.The present invention is related to power consumption reduction and power factor improvement of induction motors.The capacitors installed in parallel with induction motors are connected at the input voltage zero potential to block the current to flow in the next half cycle, that is, the reactive currents with opposite polarity of voltage and current. When the input voltage cuts off the current at zero potential, it releases the energy of the load to the capacitor, so that the current flows smoothly in the next half cycle of opposite polarity, eliminating the reactive power (SIN θ) to reduce the effective current. It is to let.
Description
제1도는 본 고안의 회로도1 is a circuit diagram of the present invention
제2도는 본 고안을 사용하였을때의 전류파형도2 is a current waveform when using the present invention
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 영전위 검출기 2 : 마이콤1: zero potential detector 2: micom
3, 8 : 트라이액 4 : 충전검출기3, 8: Triac 4: Charge detector
5 : 전압검출기 6 : 캐패시터5: voltage detector 6: capacitor
7 : 유도코일7: induction coil
본 고안은 교류유도전동기의 소모전력 절감 및 역률개선기에 관한 것으로 입력전압이 영으로 되는 순간에 부하(유도전동기)에 흐르는 전류, 즉 부하가 유도성으로 인하여 전압보다 전류가 늦어서 발생하는 전자에너지를 캐패시터로 단락(Short Circuit)시키므로서 입력전류를 차단시키고 부하에 축적된 에너지를 단락된 캐패시터로 흐르게 하므로서 효율을 증대시키고 입력전원의 역률을 개선토록 한것이다.The present invention relates to power consumption reduction and power factor improvement of AC induction motors. The current flowing through the load (induction motor) at the moment when the input voltage becomes zero, that is, the electronic energy generated when the current is later than the voltage due to the inductive load, By short circuiting the capacitor, the input current is cut off, and the energy stored in the load flows to the shorted capacitor, thereby increasing efficiency and improving the power factor of the input power.
종래에는 역률을 개선하기 위한 수단으로 부하에 캐패시터를 병열로 연결하여 부하의 유도성 리액턴스를 상쇄시키는 방법이 있잇으나 이는 부하에 따라 개별적으로 캐패시터의 크기를 산정하여야 하고, 설혹 산정된 캐패시터를 설치한다 하더라도 부하(기계적 회전력 부하)의 변동에 따라 유도성 리액턴스가 달라지기 때문에 정확한 캐패시터의 크기를 설정할 수 없으므로 역률을 개선하는데 한계가 있었다.Conventionally, as a means for improving the power factor, there is a method of canceling the inductive reactance of the load by connecting the capacitors in parallel to the load. However, the size of the capacitor must be separately calculated according to the load, and the calculated capacitor is installed. Even so, the inductive reactance varies according to the change in the load (mechanical torque), and therefore, there is a limit in improving the power factor because the exact capacitor size cannot be set.
본 고안은 이러한 종래의 불완전한 문제점을 감안하여 안출한 것인바, 이를 첨부도면에 의거하여 상세히 설명하면 다음과 같다.The present invention is devised in view of such a conventional incomplete problem, it will be described in detail based on the accompanying drawings as follows.
입력전원에 연결한 영전위검출기(1)의 출력단과, 출력전원에 연결한 캐피시터(6), 유도코일(7)및 트라이액(8)의 유도코일(7)과 트라이액(8)사이에 연결된 충전감지기(4)의 출력단과 입력전원에 연결한 트라이액(3)과 출력전원에 연결한 캐패시터(6)사이에 연결된 전압검출기(5)의 출력단을 마이콤(2)의 입력단에 각각 연결하며 트라이액(3)및 (8)의 게이트를 마이콤(2)의 출력단에 각각 연결하여서 구성된 것이다.Between the output terminal of the zero potential detector 1 connected to the input power source, the capacitor 6 connected to the output power source, the induction coil 7 and the induction coil 7 and the triac 8 of the triac 8 The output terminal of the voltage detector 5 connected between the output terminal of the connected charge detector 4 and the triac 3 connected to the input power and the capacitor 6 connected to the output power is respectively connected to the input terminal of the microcomputer 2. The gates of the triacs 3 and 8 are connected to the output terminals of the microcomputer 2, respectively.
이와 같은 본 고안은 입력전원에 연결된 영전위 검출기(1)는 입력전원 전압이 영(Zero)으로 되는 시점 (상용교류전원이 60Hz 인 경우 매초당 120회)를 포착하여 마이콤(2)으로 보낸다.In the present invention, the zero potential detector 1 connected to the input power source captures a point in time at which the input power supply voltage becomes zero (120 times per second when the commercial AC power supply is 60 Hz) and sends it to the microcomputer 2.
마이콤(2)은 이를 인터럽트 처리하여 즉시 트라이액(8)을 on시켜서 캐패시터(6)를 부하에 병렬로 접속시킨다. 부하에 병렬로 접속된 캐패시터(6)는 입력전원에서 부하로 흐르던 전류방향과 반대방향으로 갑자기 큰 전류를 흐르게 하기 때문에 트라이액(3)은 순간적으로 전류흐름이 영(Zero)이 되는 순간 off된다. 이때 캐패시터(6)에서 흐르려는 전류는 시간당 전류변화율(di/dt)이 크기 때문에 트라이액(3)은 역방향으로 도통할 수 있다. 본 고안에서는 이를 방지하기 위하여 유도코일(7)을 회로에 삽입하여 입력전원에서 흐르던 전류를 전압이 영으로 되는 순간 트라이액(3)이 원활히 차단될 수 있도록 시간당 전류변화율(di/dt)을 1(100%)이 되도록 낮추어서 캐패시터(6)에 충전되어 있는 전하를 전원입력측으로 흐르지 못하게 하고 부하로 흐르도록 한다. 부하에 축적된 에너지가 전부 캐패시터(6)로 방출되면 트라이액(8)은 off 되고 캐패시터(6)에 충전이 끝나면 충전감지(4)는 이를 감지하여 마이콤(2)으로 충전완료 신호를 통보한다. 충전완료 신호를 받은 마이콤(2)은 출력전압을 출력전압검출기(5)로 받아 연산하여 입력전원을 부하에 연결시키는 트라이액(3)을 on시켜 부하에 적절한 전압을 공급한다.The microcomputer 2 interrupts and immediately turns on the triac 8 to connect the capacitor 6 in parallel with the load. The capacitor 6 connected in parallel to the load causes a large current to flow suddenly in the direction opposite to the current flowing from the input power source to the load, so the triac 3 is turned off at the moment when the current flow becomes zero. . At this time, since the current to flow in the capacitor 6 has a large current change rate per time (di / dt), the triac (3) can be conducted in the reverse direction. In the present invention, in order to prevent this, the induction coil 7 is inserted into a circuit so that the current flowing from the input power source changes the current change rate per hour (di / dt) to 1 so that the triac (3) can be smoothly blocked. It is lowered to (100%) so that the charge charged in the capacitor 6 does not flow to the power input side and flows to the load. When all the energy stored in the load is discharged to the capacitor 6, the triac 8 turns off and when the capacitor 6 is finished charging, the charge detection 4 detects this and notifies the microcomputer 2 of the charge completion signal. . Upon receiving the charge completion signal, the microcomputer 2 receives the output voltage by the output voltage detector 5, turns on the triac 3 that connects the input power to the load, and supplies an appropriate voltage to the load.
이와 같이 본 고안은 입력전압이 영으로 되는 순간에 부하에 흐르는 전류를 단락시켜 입력전류를 차단시키고 부하에 축적된 에너지를 단락된 캐패시터로 흐르게 하여 교류유도전동기의 소모전력을 절감시키고 입력전원의 역률을 개선시키는 유용한 고안인 것이다.As such, the present invention shorts the current flowing to the load at the moment when the input voltage becomes zero, cuts off the input current, and flows the energy accumulated in the load to the shorted capacitor, thereby reducing the power consumption of the AC induction motor and reducing the power factor of the input power. It is a useful design to improve.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019970003766U KR200161724Y1 (en) | 1997-03-04 | 1997-03-04 | The power saving and power factor improving apparatus of a motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019970003766U KR200161724Y1 (en) | 1997-03-04 | 1997-03-04 | The power saving and power factor improving apparatus of a motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR970026095U KR970026095U (en) | 1997-06-20 |
| KR200161724Y1 true KR200161724Y1 (en) | 1999-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019970003766U KR200161724Y1 (en) | 1997-03-04 | 1997-03-04 | The power saving and power factor improving apparatus of a motor |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR200161724Y1 (en) |
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1997
- 1997-03-04 KR KR2019970003766U patent/KR200161724Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR970026095U (en) | 1997-06-20 |
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