Abstract:
본 발명은 유도 모터 제어용 인버터에 관한것으로, 모터의 회전수에 대응하는 주파수와, 최소 전압, 프로파일의 기울기를 이용하여 모터의 인가 전압을 생성하고, 상기 모터의 인가 전압과 상기 모터의 기설정 최대 전압으로부터 상기 펄스 폭 변조 신호의 변조율을 생성하고, 상기 주파수에 대응하는 상기 모터의 회전 각도의 증가분을 계산하고, 상기 계산된 회전 각도의 증가분과 기설정된 지연된 과거의 회전 각도의 증가분을 가산하여 상기 모터의 현재 회전 각도를 생성하고, 상기 현재의 회전 각도에 응답하여 공간 벡터 변조에 필요한 사인(sine) 값을 계산하고, 상기 사인(sine) 값과 상기 변조율을 이용하여 상기 각각의 펄스 폭 변조 신호의 펄스 폭을 나타내는 듀티 값을 생성하고, 상기 듀티 값에 각기 대응하는 상기 3 상의 펄스 폭 변조 신호를 생 성하는 콘트롤러를 포함하며, 이 콘트롤러는 고가의 16 비트대신 저가의 8 비트 마이크로콘트롤러로서 구현됨으로써, 전체 제작 단가를 낮추고 주변 기기를 소프트웨어로 대체되어 전체 크기를 줄일 수 있는 효과가 있다.
Abstract:
본 발명은 스너버(Snubber) 회로를 구비한 인버터에 관한 것으로, 장치의 구성에 필요한 소자의 수를 감소시키기 위하여 스너버 회로의 구조를 간략화시키므로써 장치의 크기 감소가 이루어지며 동작 효율이 향상될 수 있는 스너버 회로를 구비한 인버터에 관한 것이다.
Abstract:
개시된 내용은 차량의 분기를 위하여 차량에 탑재된 장치가 원하는 방향을 선택하여 차량을 유도하는 궤도차량용 분기장치에 관한 것이다. 본 발명은 2∼6인승의 소형차량을 수십 또는 수백 대씩 한꺼번에 고가궤도 위에서 운행하는 PRT(Personal Rapid Transit)시스템이 그 대표적인 응용예가 된다. 종래의 궤도차량에서 횡방향 안내 및 분기를 위한 레일이 따로 분리되어 있거나 횡방향 안내 및 분기를 위한 레일과 주행을 위한 레일이 따로 분리되어 있거나 횡방향 안내 및 분기를 위한 레일과 주행을 위한 레일이 따로 분리되어 있는 방식을 개선하여 본 발명에서는 하나의 레일로 횡방향 안내, 분기기능을 동시에 수행할 수 있고, 이 레일을 비상제동 및 주차레일로 활용할 수 있도록 할 뿐 아니라 가이드웨이의 구조를 극히 단순화하여 건설에 관련한 경제성 부문에서 획기적인 개선을 하였다. 분기레일, 가이드웨이, 안내레일, 분기휠,안내휠, 브레이크레일
Abstract:
PURPOSE: A branch unit for a railcar is provided to restrict the left movement and the right movement of the railcar by using horizontal guide wheels and branch wheels for catching a brake rail. CONSTITUTION: A branch unit for a railcar includes a guide way(8), two couples of horizontal guide wheels(6a-6d), and a plurality of branch wheels(7a,7b). The guide way(8) is used for performing a horizontal guide operation, a branch operation, and an emergency braking operation. The horizontal guide wheels(6a-6d) are installed on a lateral part of a main frame(10) in order to catch a plurality of horizontal guide and branch rails and guide the railcar. The branch wheels(7a,7b) are installed at both ends of the branch arms in order to perform the horizontal guide operation and the branch operation.
Abstract:
PURPOSE: A hybrid PWM(Pulse Width Modulation) AC/DC converter having an active filtering function in a power supply system is provided to convert an AC voltage to a DC voltage and remove harmonic current by using an active power filter function. CONSTITUTION: The current(Isa,Isb,Isc) generated from power source(103) is the sum of the current(ILa,ILb,ILc) consumed in a non-linear load(102) and the current(IFa,IFb,IFc) inputted into a hybrid PWM AC/DC converter(400). The current(Isa,Isb,Isc) of the power source(103) becomes sinusoidal wave by removing harmonic current from the current(ILa,ILb,ILc) of the non-linear load(102). The hybrid PWM AC/DC converter(400) is formed with an inductor filter(401), a capacitor filter(402), a pulse width converter power stack(403), and an inductor filter(404). The inductor filter(401) is formed with a plurality of inductors(LF1,LF2,LF3).
Abstract translation:目的:提供一种在电源系统中具有有源滤波功能的混合PWM(脉宽调制)AC / DC转换器,以将交流电压转换为直流电压,并通过使用有功功率滤波器功能消除谐波电流。 构成:从电源(103)产生的电流(Isa,Isb,Isc)是在非线性负载(102)和电流(IFa,IFb,IFc)中消耗的电流(ILa,ILb,ILc)之和 )输入到混合PWM AC / DC转换器(400)中。 通过从非线性负载(102)的电流(ILa,ILb,ILc)去除谐波电流,电源(103)的电流(Isa,Isb,Isc)变为正弦波。 混合PWM AC / DC转换器(400)由电感滤波器(401),电容滤波器(402),脉宽转换器功率堆(403)和电感滤波器(404)构成。 电感器滤波器(401)形成有多个电感器(LF1,LF2,LF3)。
Abstract:
PURPOSE: A converter and inverter system for modulating a pulse width is provided to improve the reliability of the converter and inverter system, and to decrease the price and the volume by applying a DC link electric power balanced method and an energy control method at a PWM converter-inverter system. CONSTITUTION: A converter and inverter system includes an encoder(110), a speed controller(112), a flux controller(113), a current controller(114), the first coordinate converter(115), and the first EPLD(Erasable Programmable Logic Device)(116). The encoder(110) detects a real speed of an AC motor(50) and a location of a rotator magnetic flux vector. The speed controller(112) builds up a q-axis current instruction value by comparing an external speed instruction value and the real speed of the AC motor(50). The flux controller(113) builds up a d-axis current instruction value by comparing an external magnetic flux instruction value with a flux calculated through a numerical formula. The current controller(114) builds up a voltage instruction value for a d-q axis current by using the location of the rotator magnetic flux vector, the q-axis current instruction value, and the d-axis current instruction value. The first coordinate converter(115) converts a coordinate of the voltage instruction value by using the location of the rotator magnetic flux vector. The first EPLD(116) generates a PWM signal needed in an inverter(40) through a fixing coordinate system voltage instruction value converted by the first coordinate converter(115).
Abstract:
PURPOSE: A snubber circuit for a three-level GTO inverter or converter is provided to minimize the number of device parts while preventing a voltage unbalance between an inside GTO device and an outside GTO device. CONSTITUTION: The first capacitor(Cp) and the second capacitor(Cn) are connected in series to an input power terminal(ED). The GTOs(G1,G2,G3,G4) connected in series are connected to the first and second capacitors(Cp,Cn) in parallel. Each of the diodes(FD1,FD2,FD3,FD4) is connected in parallel to each of the GTOs(G1,G2,G3,G4). The first clamp diode(DC1) is connected in series between a connecting point of the first and second capacitors(Cp,Cn) and a connecting point of the first and second GTOs(G1,G2). The second clamp diode(DC2) is connected in series between a connecting point of the third and fourth GTSs(G3,G4) and a connecting point of the first and second capacitors(Cp,Cn). An output terminal(ILOAD) for supply a load power is connected to a connecting point of the second and third GTSs(G2,G3) to define a three-level GTO inverter or converter.
Abstract:
PURPOSE: A method for controlling compensation for the inequality power and the instant low voltage is provided to prevent stopping of a continuous progress line by the low voltage by compensating the inequality power and the instant low voltage and to gain dependence on the compensation by making the error to the minimum. CONSTITUTION: A method for controlling compensation for the inequality power and the instant low voltage includes a few stages. In the first stage the power voltage, the voltage of a filter and the output current of an inverter are measured and the current is calculated. In the second stage converting coordinates of 3 phases to those of 2 phases. In the third stage the power voltage is separated into the positive phase sequence component of voltage and negative phase sequence component of voltage. In the fourth stage the positive phase sequence component of voltage is compensated. In the fifth stage the negative phase sequence component of voltage is compensated. In the sixth stage the inverter output current is compensated in the basis of the compensated voltage. In the seventh stage the pulse width of a space vector is converted. In the eighth stage the inverter is controlled through the gate driving portion.
Abstract:
PURPOSE: A high voltage motor driving system is provided to drive the high voltage motor by using the low voltage components to reduce the energy consumption and to provide the high efficient operation. CONSTITUTION: The high voltage motor driving system comprises a three phase power supplier(1), a motor(2), three transformers, a voltage dropping unit, and a low voltage AC-AC alternative voltage controller having thyristors. Each secondary side of each transformer is connected between the three phase power supplier and the motor. Each primary side of each transformer is connected to the AC-AC alternative voltage controller. The AC-AC alternative voltage controller used to drop the power supplier voltage is connected to the three phase power supplier by Y-connection or delta-connection and shifts the phase by 30°. The phase of the dropped voltage is shifted by 180° by shifting the phase with 150° at the primary side of the transformer. The sum of the power source voltage used to drive the motor at steady state and the output voltage of the AC-AC alternative voltage controller used to vary the motor speed is supplied to the motor. At the initial operation stage, the AC-AC alternative voltage controller is turned off to prevent the initial overcurrent by forming the transformers as series connected inductors.
Abstract:
PURPOSE: A linear synchronizing motor is provided to improve the mechanical efficiency by making the attractive force acting between coils and a permanent magnet and to efficiently discharge the heat generated from the coils. CONSTITUTION: A linear synchronizing motor comprises a feeding section, coils, and a permanent magnet. An object is loaded on the feeding section. The movement of the feeding section is accomplished according to the electromagnetic law. A guide and a bearing engaged with the guide is attached to the feeding section. The heat generated in the coils is radiated through the side surface of the feeding section. The feeding section is moved by the magnetic force formed in the permanent magnet and the currents flowing through the coils.