KR890008934Y1 - Arrangement for controlling the torque of induction motor - Google Patents
Arrangement for controlling the torque of induction motor Download PDFInfo
- Publication number
- KR890008934Y1 KR890008934Y1 KR2019870011551U KR870011551U KR890008934Y1 KR 890008934 Y1 KR890008934 Y1 KR 890008934Y1 KR 2019870011551 U KR2019870011551 U KR 2019870011551U KR 870011551 U KR870011551 U KR 870011551U KR 890008934 Y1 KR890008934 Y1 KR 890008934Y1
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- voltage
- induction motor
- phase induction
- torque
- line
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
-
- 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
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/01—Asynchronous machines
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 블록도.1 is a block diagram of the present invention.
제2도는 본 고안의 상세 회로도.2 is a detailed circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 :-Y 변류기 2 : 정류기One : -Y Current Transformer 2: Rectifier
3 : 전압레벨 조정부 4 : 감산부3: voltage level adjusting unit 4: subtracting unit
5 : 가산부 5 : 전압 설정부5: adding unit 5: voltage setting unit
M1: 삼상유도전동기M 1 : three-phase induction motor
본 고안은 삼상유도전동기의 운전을 제어하는 삼상유도 전동기의 점토크 제어회로에 관한 것으로, 특히 삼상유도전동기의 선간 전압을 검출하고, 그 검출된 선간전압으로 삼상유도전동기의 인가전압을 제어하여 삼상유도전동기를 점토크로 운전하게 한 삼상유도전동기의 정토크 제어회로에 관한 것이다.The present invention relates to a point torque control circuit of a three-phase induction motor that controls the operation of a three-phase induction motor. In particular, the three-phase induction motor detects the line voltage of the three-phase induction motor and controls the applied voltage of the three-phase induction motor to control the three-phase induction motor. The present invention relates to a positive torque control circuit of a three-phase induction motor that causes an induction motor to operate as a clay torque.
종래에는 VVVF 인버터로 삼상유도전동기를 운전할 경우에 삼상유도 전동기에 인가되는 교류전압의 주파수 함수로만 제어를 하였으므로 삼상유도 전동기를 이상적인 점토크로 운전시킬수 없었다.Conventionally, when a three-phase induction motor is operated with a VVVF inverter, only a three-phase induction motor is operated as a function of the frequency of an alternating voltage applied to the three-phase induction motor.
즉, VVVF 인버터를 이용하여 삼상유도전동기를 운전할 경우에 삼상유도 전동기의 회전속도는 식(1)과 같다.In other words, when the three-phase induction motor is operated using the VVVF inverter, the rotation speed of the three-phase induction motor is as shown in Equation (1).
여기서, N은 회전속도, f는 공급 교류전압의 주파수, P는 극수, S는 슬립이다.Where N is the rotational speed, f is the frequency of the supply AC voltage, P is the number of poles, and S is the slip.
그리고, 임의의 슬립(S)에서 삼상유도전동기의 출력토크는 식(2)와 같다.Then, the output torque of the three-phase induction motor at any slip (S) is as shown in equation (2).
여기서, T는 출력토크, K는 상수, Sf는 슬립 주파수, V는 선간전압이다.Where T is the output torque, K is the constant, Sf is the slip frequency, and V is the line voltage.
따라서, 임의의 슬립(S)에서 운전되는 삼상유도전동기의 토크(T)가 정토크로되기 위해서는 공급되는 교류전압의 주파수(f)와 선간전압(V)이 일정하게 되어야 하나 종래에는 주파수(f)만으로 제어하였으므로 삼상유도전동기를 정토크로 운전시킬수 없는 결함이 있었다.Therefore, in order for the torque T of the three-phase induction motor operated at an arbitrary slip S to become a constant torque, the frequency f and the line voltage V of the supplied AC voltage must be constant, but conventionally the frequency f Since it was controlled only by a motor, there was a defect that the three-phase induction motor could not be operated with a constant torque.
본 고안의 목적은 삼상유도 전동기의 선간전압을 검출한 후 그 검출한 오차전압으로 삼상유도전동기에 인가하는 전압을 제어함으로서 삼상유도전동기를 정토크로 운전시킬 수 있는 회로를 제공함에 있다.An object of the present invention is to provide a circuit capable of operating a three-phase induction motor by constant torque by detecting the line voltage of the three-phase induction motor and controlling the voltage applied to the three-phase induction motor with the detected error voltage.
이하 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.Hereinafter, described in detail with reference to the accompanying drawings.
제1도및 제2도에 도시된 바와같이결선된 삼상 유도 전동기(M1)의 선간 전압을 Y결선 선간전압으로 변환하는-Y 변류기(1)와, 상기-Y 변류기(1)의 출력전압을 정류하는 다이오드(D1-D6)로 된 정류기(2)와, 상기 정류기(2)의 출력전압의 레벨을 조정하는 콘덴서(C1-C3), 저항(R1-R5), 가변저항(VR1)및 연산증폭기(OP1, OP2)로 된 전압레벨 조정부(30)와, 상기 전압레벨 조정부(3)의 출력전압을 기준전압(Vref)에서 감산하여 오차전압을 검출하는 저항(R6-R9)및 연산증폭기(OP3)로 된 감산부(4)와, 상기 감산부(4)의 출력전압을 기준전압과 가산하는 저항(R10-R14)및 연산증폭기(OP4)로 된 가산부(5)와, 상기 가산부(5)의 출력전압에 따라 상기 삼상유도전동기(M1)의 인가전압을 설정하는 전압설정부(6)로 구성하였다.As shown in FIGS. 1 and 2 Converting the line voltage of the connected three-phase induction motor (M 1 ) to the Y-connection line voltage -Y current transformer 1 and the A rectifier (2) comprising a diode (D 1 -D 6 ) rectifying the output voltage of the -Y current transformer (1), a capacitor (C 1 -C 3 ) for adjusting the level of the output voltage of the rectifier (2), The voltage level adjusting unit 30 including the resistors R 1 -R 5 , the variable resistor VR 1 , and the operational amplifiers OP 1 , OP 2 , and the output voltage of the voltage level adjusting unit 3 are referred to as reference voltages Vref. ) resistance (R 6 -R 9) for subtracting the detected error voltage, and in the operational amplifier (OP 3), a subtraction unit 4, a resistor to be added to the reference voltage an output voltage of the subtraction unit 4 to the ( An adder (5) comprising R 10 -R 14 ) and an operational amplifier (OP 4 ), and a voltage setting unit for setting an applied voltage of the three-phase induction motor (M 1 ) according to the output voltage of the adder (5). It consisted of (6).
이와같이 구성된 본 고안은 전압설정부(6)에서 일정전압을 출력하여 삼상유도전동기(M1)가 운전되면,-Y 변류기(1)는 삼상유도 전동기(M1)의결선의 선간전압을 Y결선의 선간전압으로 변환하고, 그 변환한 Y결선의 선간전압은 정류기(2)에 입력되어 다이오드(D1-D6)에 의해 전파정류된 후 전압레벨 조정부(3)로 입력되는데 저항(R1, R2)에 의해 분할하여 상기 정류기(2)의 출력으로부터 연산증폭기(OP1)의 입력단을 보호하고 콘덴서(C1)에 의해 평활되어 저항(R3)을 통해 연산증폭기(OP1)의 반전입력단자(-)에 인가되므로 연산증폭기(OP1)는 그 인가된 전압을 반전 증폭하고, 그 반전증폭한 전압은 연산증폭기(OP2)에 의해 다시 반전증폭되어 출력되며, 그 출력된 삼상유도 전동기(M1)의 선간전압은 감산부(4)의 연산증폭기(OP3)의 반전 입력단자(-)에 인가되고, 이때 연산증폭기(OP3)의 비반전 입력단자(+)에는 기준전압(Vref)이 인가되므로 연산증폭기(OP3)는 기준전압(Vref)에서 전압레벨 조정부(3)의 출력전압을 감산하여 오차전압을 출력하고, 그 출력된 오차전압은 기준전압(Vref)과 함께 가산부(5)의 연산증폭기(OP4)를 통해 가산된후 전압설정부(6)에 입력되므로 전압설정부(6)는 그 입력된 전압에 따라 삼상유도전동기(M1)의 공급전압을 제어하여 삼상유도 전동기(M1)는 정토크로 운전하게 된다.When the three-phase induction motor (M 1 ) is operated by outputting a constant voltage from the voltage setting unit (6), -Y current transformer (1) is a three-phase induction motor (M 1 ) The line voltage of the connection is converted into the line voltage of the Y connection, and the converted line voltage of the Y connection is inputted to the rectifier 2, full-wave rectified by the diodes D 1- D 6 , and then the voltage level adjusting unit 3. Is divided by resistors (R 1 , R 2 ) to protect the input terminal of operational amplifier (OP 1 ) from the output of the rectifier (2) and smoothed by capacitor (C 1 ) through resistor (R 3 ) an operational amplifier (OP 1), the inverting input terminal of the (-) so applied to the operational amplifier (OP 1) is the voltage obtained by inverting amplification of the applied voltage, and amplifying the inverted are re-inverted and amplified by the operational amplifier (OP 2) The line voltage of the output three-phase induction motor (M 1 ) is applied to the inverting input terminal (-) of the operational amplifier OP 3 of the subtractor 4, wherein the non-inverting of the operational amplifier OP 3 Since the reference voltage Vref is applied to the input terminal (+), the operational amplifier OP 3 adjusts the voltage level controller 3 at the reference voltage Vref. Error voltage is output by subtracting the output voltage, and the output error voltage is added together with the operational voltage OP 4 of the adder 5 together with the reference voltage Vref to the voltage setting part 6. Since the voltage setting unit 6 controls the supply voltage of the three-phase induction motor M 1 according to the input voltage, the three-phase induction motor M 1 operates with a constant torque.
즉, 본 고안은 삼상유도 전동기(M1)의 선간전압을-Y 변류기(1)로 Y결선의 선간전압으로 변환하고, 정류기(2)로 전파정류한 후 전압 레벨조정부(3)로 선간전압의 레벨을 조정하고, 그 레벨이 조정된 선간전압은 삼상유도전동기(M1)가 정토크로 구동할 경우의 선간전압인 기준전압(Vref)과 감산부(4)를 통해 감산되어 오차전압을 검출하며, 그 검출된 오차전압은 기준전(Vref)과 함께 가산부(5)를 통해 가산된 후 전압 설정부(6)에 입력되어 전압설정부(6)는 그 입력된 전압에 따라 유도전동기(M1)의 선간전압이 기준전압(Vref)와 동일하게 되도록 삼상유도전동기(M1)의 공급전압을 제어하므로 삼상유도전동기(M1)는 정토크로 구동되게 된다.In other words, the present invention is to determine the line voltage of the three-phase induction motor (M 1 ) After converting to line voltage of Y-connection by -Y current transformer (1), full-wave rectifying with rectifier (2), and adjusting the level of line voltage with voltage level adjusting section (3), the line voltage with the level adjusted is three-phase induction An error voltage is detected by subtracting the reference voltage Vref and the subtractor 4, which are the line voltages when the motor M 1 drives with a constant torque, and the detected error voltage is together with the reference voltage Vref. After adding through the adder 5, the voltage is input to the voltage setting unit 6 so that the line voltage of the induction motor M 1 is equal to the reference voltage Vref according to the input voltage. such that it controls the supply voltage of the three-phase induction motor (M 1) three-phase induction motor (M 1) is to be driven at a constant torque.
이상에서 설명한 바와같이 본 고안은 삼상유도전동기의 선간전압이 일정전압으로 되게 삼상유도전동기의 공급전압을 제어하여 삼상유도전동기가 정토크로 구동되게 되므로 과부하가 인가되어도 삼상유도전동기는 정토크로 운전하여 파열이 방지됨은 물론 부하의 변도에 따른 속도변동이 거의 없이 고효율로 운전할 수 있는 효과가 있다.As described above, the present invention controls the supply voltage of the three-phase induction motor so that the line voltage of the three-phase induction motor becomes a constant voltage, so that the three-phase induction motor is driven with a constant torque, so even if an overload is applied, the three-phase induction motor operates with the positive torque. As well as preventing rupture, there is an effect that can be operated with high efficiency with almost no speed fluctuation due to load variation.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870011551U KR890008934Y1 (en) | 1987-07-14 | 1987-07-14 | Arrangement for controlling the torque of induction motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870011551U KR890008934Y1 (en) | 1987-07-14 | 1987-07-14 | Arrangement for controlling the torque of induction motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR890003727U KR890003727U (en) | 1989-04-13 |
| KR890008934Y1 true KR890008934Y1 (en) | 1989-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019870011551U KR890008934Y1 (en) | 1987-07-14 | 1987-07-14 | Arrangement for controlling the torque of induction motor |
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| Country | Link |
|---|---|
| KR (1) | KR890008934Y1 (en) |
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1987
- 1987-07-14 KR KR2019870011551U patent/KR890008934Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR890003727U (en) | 1989-04-13 |
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