KR20030040933A - Apparatus for controlling power supply of induction motor - Google Patents
Apparatus for controlling power supply of induction motor Download PDFInfo
- Publication number
- KR20030040933A KR20030040933A KR1020010071607A KR20010071607A KR20030040933A KR 20030040933 A KR20030040933 A KR 20030040933A KR 1020010071607 A KR1020010071607 A KR 1020010071607A KR 20010071607 A KR20010071607 A KR 20010071607A KR 20030040933 A KR20030040933 A KR 20030040933A
- Authority
- KR
- South Korea
- Prior art keywords
- voltage
- induction motor
- power supply
- insulation resistance
- input
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
-
- 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
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
-
- 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
- H02H3/20—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 excess voltage
-
- 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
- H02H3/08—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 excess current
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
Description
본 발명은 유도전동기의 전원인가제어장치에 관한 것으로, 더욱 상세하게는 유도전동기에 인가되는 3상전원의 전력 및 유도전동기의 절연저항값을 측정하여 유도전동기의 전원인가여부를 제어함으로써 마그네트스위치의 접점이 급격한 전력공급에 의해 소손되는 현상을 방지하고, 유도전동기의 운전효율을 증대시키는 유도전동기의 전원인가제어장치에 관한 것이다.The present invention relates to a power supply control apparatus of an induction motor, and more particularly, by measuring the power of the three-phase power applied to the induction motor and the insulation resistance value of the induction motor to control whether the induction motor is powered. The present invention relates to a power supply control apparatus for an induction motor that prevents the contact from being burned out by a sudden power supply and increases the operating efficiency of the induction motor.
일반적으로, 교류의 유도전동기는 정격전압이 인가되면 그 회전축에 인가된 부하의 크기에 따라 회전속력이 변화하게 되고, 고정자측의 회전자계와 회전자의회전속력차로부터 회전력이 생기므로 중부하보다는 경부하일수록 그 회전속력이 점차 가속되지만 무부하의 경우 동기속력에 근접하게 된다.In general, induction motors of alternating current change the rotational speed according to the magnitude of the load applied to the rotating shaft when the rated voltage is applied, and the rotational force is generated from the difference between the rotational speed of the rotor and the rotor on the stator side. The higher the speed, the faster the rotational speed is, but the closer to the synchronous speed at no load.
특히, 유도전동기의 효율을 증대시키는 방법으로는 유도전동기가 일정속도로 주행할 때 인가되는 입력전력을 제어하는 방법이 있으나, 유도전동기의 효율향상을 위하여 인가전압을 낮추면 전기적 발생토크가 작아지므로 동일한 부하에 대하여 속력이 감소되고, 입력전압을 더욱 낮추면 부하토크보다 적은 토크를 발생시킬 경우 불안정한 운전영역으로 진전되는 문제가 있다.In particular, as a method of increasing the efficiency of an induction motor, there is a method of controlling the input power applied when the induction motor is driven at a constant speed. The speed is reduced with respect to the load, and if the input voltage is further lowered, there is a problem of progressing to an unstable operation region when generating less torque than the load torque.
더욱이, 유도전동기의 입력전원을 단속하는 마그네트스위치는 접점순간 과도한 입력전압에 의해 소손되는 문제가 있어 유도전동기에 인가되는 입력전력을 적정한 범위내에서 제어할 필요가 있다.In addition, the magnet switch that interrupts the input power of the induction motor has a problem of being burned out by excessive input voltage at the instant of contact, so it is necessary to control the input power applied to the induction motor within an appropriate range.
또한, 유도전동기의 사용에 있어 누전 등의 원인에 의해 유도전동기코일의 절연저항값이 낮은 상태에서 유도전동기에 전원이 공급되면 코일이 소손되거나 과다한 전류가 흐르게 되어 유도전동기의 파손을 유발시키게 된다.In addition, when power is supplied to the induction motor in a state where the insulation resistance of the induction motor coil is low due to a short circuit or the like in the use of the induction motor, the coil is burned out or excessive current flows, causing damage to the induction motor.
본 발명은 이러한 종래의 문제를 해결하기 위한 것으로, 유도전동기에 인가되는 3상전원의 입력전력 및 유도전동기의 절연저항값을 측정하여 유도전동기의 전원인가여부를 제어함으로써 급격한 전력공급에 의한 마그네트스위치의 소손되는 현상을 방지하고, 유도전동기의 코일 소손을 예방하게 되는 유도전동기의 전원인가제어장치를 제공함에 그 목적이 있다.The present invention is to solve such a conventional problem, by measuring the input power of the three-phase power applied to the induction motor and the insulation resistance value of the induction motor by controlling the power supply of the induction motor magnet switch by a sudden power supply It is an object of the present invention to provide a power supply control apparatus of an induction motor to prevent the burnout of the induction motor, and to prevent the coil burnout of the induction motor.
도1은 본 발명에 따른 유도전동기의 전원인가제어장치를 나타내는 구성도이다.1 is a configuration diagram showing a power supply control apparatus of an induction motor according to the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10: 변압부 20: 정류부 30: 증폭부 40: 변환부 50: 전원인가제어부 60: 액정표시부 70: 전원인가부 80: 유도전동기 90: 절연저항측정부DESCRIPTION OF SYMBOLS 10 Transformer 10 Rectifier 30 Amplifier 40 Converter 50 Power supply control part 60 Liquid crystal display 70 Power supply part 80 Induction motor 90 Insulation resistance measurement part
상기한 목적을 달성하기 위하여 본 발명은 3상전원의 입력전압으로부터 선간전압을 검출하여 변압하는 변압부; 상기 변압부로부터 출력되는 교류전압을 다이오드(D)와 콘덴서(c)를 이용하여 직류전압으로 변환하는 정류부; 상기 정류부로부터 입력되는 직류전압을 증폭하는 증폭부; 및 상기 증폭부에서 증폭된 아날로그신호를 디지탈신호로 변환하는 변환부; 유도전동기의 절연저항값을 측정하는 절연저항측정부; 상기 변환부 및 절연저항측정부로부터 입력된 3상전원의 입력전압과 절연저항값을 액정표시부에 표시하거나 설정된 전압 및 절연저항값과 비교하여 전원인가여부를 판단하는 전원인가제어부; 그리고 상기 전원인가제어부의 제어신호에 따라 유도전동기에 인가되는 3상전원의 입력전압을 스위칭하는 전원인가부;로 구성되는 것을 특징으로 하는 유도전동기의 전원인가제어장치를 제공한다.In order to achieve the above object, the present invention includes a transformer for detecting and transforming the line voltage from the input voltage of the three-phase power source; A rectifier for converting an AC voltage output from the transformer unit into a DC voltage using a diode D and a capacitor c; An amplifier for amplifying the DC voltage input from the rectifier; And a converter converting the analog signal amplified by the amplifier into a digital signal. An insulation resistance measuring unit for measuring an insulation resistance value of the induction motor; A power supply control unit which displays the input voltage and insulation resistance of the three-phase power input from the converter and the insulation resistance measurement unit on the liquid crystal display or compares the set voltage and insulation resistance to determine whether power is supplied; And a power supply unit for switching an input voltage of a three-phase power source applied to the induction motor according to the control signal of the power supply control unit.
도면을 참조하여 본 발명을 상세히 설명하기로 한다.The present invention will be described in detail with reference to the drawings.
도1은 본 발명에 따른 유도전동기의 전원인가제어장치를 나타내는 구성도이다.1 is a configuration diagram showing a power supply control apparatus of an induction motor according to the present invention.
본 발명의 변압부(10)에서는 3상전원의 각 선간전압인 Vuv,Vvw,Vwu을 검출하여 변압하게 되고, 정류부(20)에서는 다이오드(D)와 콘덴서(c)를 이용하여 교류전압을 직류로 변환하게 된다.The transformer unit 10 of the present invention detects and transforms Vuv, Vvw, and Vwu, which are the voltages between the three phase power lines, and the rectifier unit 20 converts the AC voltage using the diode D and the capacitor c. Will be converted to.
이때, 증폭부(30)에서는 직류전압을 일정크기로 증폭하여 변환부(40)로 전송하게 되고, 변환부(40)에서는 입력되는 아날로그신호를 디지탈신호로 변환하여 전원인가제어부(50)로 전송하게 된다.At this time, the amplifier 30 amplifies the DC voltage to a predetermined magnitude and transmits it to the converter 40, and the converter 40 converts the input analog signal into a digital signal and transmits it to the power supply controller 50. Done.
여기서, 전원인가제어부(50)에서는 입력되어 있는 프로그램에 따라변환부(40)의 디지탈신호를 처리하게 되는데, 이때 디지탈신호로 입력되는 3상전원의 각 선간전압인 Vuv,Vvw,Vwu을 하기와 같은 입력전압과 선간전압의 관계식을 이용하여 입력전압을 산출하게 된다.Here, the power supply control unit 50 processes the digital signal of the conversion unit 40 according to the input program, where Vuv, Vvw, and Vwu, which are voltages between the lines of the three-phase power source input as the digital signal, are as follows. The input voltage is calculated using the relationship between the same input voltage and line voltage.
Vu ＝ (Vuv － Vwu)/3Vu = (Vuv-Vwu) / 3
Vv ＝ (Vvw － Vuv)/3Vv = (Vvw-Vuv) / 3
Vw ＝ (Vwu － Vvw)/3Vw = (Vwu-Vvw) / 3
그리고, 전원인가제어부(50)에서는 상기 식을 통해 입력전압 Vu,Vv,Vw이 구해지면 액정표시부(60)를 통해 디스플레이하게 된다.When the input voltages Vu, Vv, and Vw are obtained through the above equation, the power supply control unit 50 displays them through the liquid crystal display 60.
여기서, 절연저항측정부(90)에서는 유도전동기(80)의 가동전에 그 유도전동기코일의 절연저항값을 측정하여 그 측정값을 전원인가제어부(50)에 입력시키게 된다.Here, the insulation resistance measuring unit 90 measures the insulation resistance value of the induction motor coil before the induction motor 80 is operated and inputs the measured value to the power supply controller 50.
또한, 전원인가제어부(50)에서는 절연저항측정부(90)로부터 입력되는 유도전동기(80)의 절연저항값을 디지탈신호로 변환하여 액정표시부(60)를 통해 디스플레이하게 된다.In addition, the power supply control unit 50 converts the insulation resistance value of the induction motor 80 input from the insulation resistance measurement unit 90 into a digital signal for display on the liquid crystal display 60.
더욱이, 전원인가제어부(50)에서는 기설정된 설정전압과 절연저항값을 각각 입력전압 Vu,Vv,Vw 또는 입력절연저항값과 비교 연산하여 인가여부를 판단하게 되고, 입력전압 Vu,Vv,Vw 또는 입력절연저항값이 설정전압 또는 설정절연저항값을 초과할 경우 전원차단신호를 전원인가부(70)에 전송하게 되지만 입력전압 Vu,Vv,Vw 과 입력절연저항값이 설정전압과 설정절연저항값을 모두 초과하지 않을 경우에만 전원인가부에 전원인가신호를 전송하게 된다.In addition, the power supply controller 50 compares the predetermined set voltage and the insulation resistance value with the input voltage Vu, Vv, Vw or the input insulation resistance value, respectively, and determines whether to be applied or not, and input voltage Vu, Vv, Vw or the like. When the input insulation resistance value exceeds the set voltage or the set insulation resistance value, the power cutoff signal is transmitted to the power supply unit 70, but the input voltages Vu, Vv, Vw and the input insulation resistance value are the set voltage and the set insulation resistance value. Power supply signal is transmitted to the power supply unit only when both of them are not exceeded.
한편, 전원인가부(70)에서는 전원인가제어부(50)의 신호에 따라 입력전압 Vu,Vv,Vw의 인가여부를 스위칭하는 회로로 구성되어 있다.On the other hand, the power supply unit 70 is composed of a circuit for switching the application of the input voltages Vu, Vv, Vw in accordance with the signal from the power supply control unit 50.
이때, 유도전동기(80)에는 전원인가부(70)를 통해 적정부하의 입력전압이 공급되어 그 운전효율 및 생산성이 증대되면서 그 수명이 연장된다.At this time, the induction motor 80 is supplied with the input voltage of the appropriate load through the power supply unit 70, the operation efficiency and productivity is increased and its life is extended.
본 발명은 유도전동기에 인가되는 3상전원의 입력전력을 제어하여 급격한 전력공급에 의한 마그네트스위치 및 유도전동기코일이 소손되는 현상을 방지하고, 유도전동기의 운전효율을 증대시키며, 결국 유도전동기의 수명을 증대시킬 수 있는 효과를 제공하게 된다.The present invention controls the input power of the three-phase power applied to the induction motor to prevent the magnet switch and the induction motor coil burn out by a sudden power supply, to increase the operating efficiency of the induction motor, and eventually to the life of the induction motor It will provide an effect that can increase the.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020010071607A KR20030040933A (en) | 2001-11-17 | 2001-11-17 | Apparatus for controlling power supply of induction motor |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020010071607A KR20030040933A (en) | 2001-11-17 | 2001-11-17 | Apparatus for controlling power supply of induction motor |
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| KR20030040933A true KR20030040933A (en) | 2003-05-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100585378B1 (en) * | 2004-08-17 | 2006-05-30 | 대성전기공업 주식회사 | Leakage Current Detect Interrupter |
| KR100775340B1 (en) * | 2006-10-25 | 2007-11-08 | 엘에스산전 주식회사 | Apparatus and method for measuring line-to-line voltage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR890017855A (en) * | 1988-05-09 | 1989-12-18 | 안시환 | Control circuit and control method of induction motor |
| KR19980066949A (en) * | 1997-01-30 | 1998-10-15 | 김광호 | Overvoltage input protection circuit of power supply |
| KR20000001048A (en) * | 1998-06-08 | 2000-01-15 | 최규남 | Apparatus for protecting motor drive |
-
2001
- 2001-11-17 KR KR1020010071607A patent/KR20030040933A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR890017855A (en) * | 1988-05-09 | 1989-12-18 | 안시환 | Control circuit and control method of induction motor |
| KR19980066949A (en) * | 1997-01-30 | 1998-10-15 | 김광호 | Overvoltage input protection circuit of power supply |
| KR20000001048A (en) * | 1998-06-08 | 2000-01-15 | 최규남 | Apparatus for protecting motor drive |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100585378B1 (en) * | 2004-08-17 | 2006-05-30 | 대성전기공업 주식회사 | Leakage Current Detect Interrupter |
| KR100775340B1 (en) * | 2006-10-25 | 2007-11-08 | 엘에스산전 주식회사 | Apparatus and method for measuring line-to-line voltage |
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