Abstract:
A slip-recovery AC motor drive includes two inverters connected in series between the DC link terminals derived from the rectifier coupled with the rotor, and the thyristors are controlled asymmetrically between pairs of half-bridges pertaining to different inverters, thereby to by-pass the output of one inverter alternately during successive equal time intervals of conduction. The recovery transformer has two secondaries each connected to a corresponding inverter output.
Abstract:
A motor drive apparatus has G groups (G.gtoreq.2) of m-phases inverter units and G groups (G.gtoreq.2) of m-phases AC windings for feeding through the m-phases inverter units to the m-phases AC windings and G groups (G.gtoreq.2) of DC power sources which are connected to G groups of the inverter units so as to form alternative series closed loops on the DC circuit.
Abstract:
A super-synchronous Scherbius apparatus which enables wound rotor type induction motors to have a smooth speed control below and above the synchronous speed by controlling the secondary power in either the forward or backward direction through the connection of a cyclo-converter on its secondary side includes a first detecting circuit for detecting a signal corresponding to the primary voltage or the rotating magnetic field, a second detecting circuit for detecting a signal corresponding to the position of the rotor, and a calculating circuit for forming a signal corresponding to the phase of the secondary voltage in accordance with the signals of the first and second detecting circuits.
Abstract:
The present invention relates to an inverter type voltage output system of a generator excitation system test apparatus, which includes a PWM modulator for driving an IGBT inverter bridge module by generating a PWM signal on the basis of a value instructed by a built-in control module, in order to output a voltage signal normally; an IGBT inverter bridge module for outputting a square wave type sin waveform by switching a DC-link voltage of DC 300 V which is obtained by rectifying a commercial AC voltage, according to the PWM signal of the PWM modulator; and the built-in control module which receives a control signal outputted from a main control module and an inverter type voltage output signal outputted through the IGBT inverter bridge module, and then converts the control signal and the inverter type voltage output signal into an analog-digital signal, and controls the inverter type voltage output signal, by controlling the PWM modulator by performing an internal proportional integration (PI) algorithm by receiving the converted signal.
Abstract:
An electronic drive circuit for a bidirectional DC motor is provided to remove unnecessary electromagnetic waves generated in a relay and high fluctuation current by replacing a part of a mechanical relay with a SCR(Silicon Control Rectifier) or a triac as a switching electric component. A power supply unit supplies DC power. Switches(SW2) control to supply the DC power supplied from the power supply unit to a motor. The motor is driven by the control of the switch bidirectionally. Diodes(D1,D2) prevent generation of reverse current by the motor. Thyristors(SCR1,SCR2) are connected to the switches respectively. By using the applied driving voltage through the switches, the thyristor controls the drive of the motor. The thyristor is implemented by a SCR(Silicon Controlled Rectifier) or a triac(triode AC switch).
Abstract:
PURPOSE: An inverter is provided to efficiently control a power flow by transmitting power from a motor to a power system via the inverter in a sudden stop of the motor. CONSTITUTION: A rectifier(30) rectifies an AC voltage from a power supply unit(20) and includes a plurality of first switching elements. A DC link unit(40) provides the rectified voltage to a DC voltage. The DC link unit includes two capacitors which are serially connected. An inverter provides a signal for driving a motor(60) by the switching operation of a second switch element.
Abstract:
At least one embodiment of the invention generally relates to a drive system for a facility having an alternating-current isolated network, in particular for a ship or an offshore platform, including a three-phase drive machine, which can be operated both as a motor and as a generator, and including a converter having a direct-current intermediate circuit having an intermediate circuit voltage. At least one embodiment of the invention aims to provide a way of avoiding undesired and/or impermissible voltage and/or frequency increases in the alternating-current isolated network. For this purpose, the drive system includes according to the invention an energy absorbing device arranged in the intermediate circuit, which energy absorbing device includes at least one energy absorber, which preferably includes at least one electrical resistor, for absorbing at least a part of the electrical energy that the three-phase drive machine generates in generator operation and outputs to the intermediate circuit by way of the motor-side current converter of the converter. The energy absorber can be activated by the energy absorbing device according to the polarity of the intermediate circuit voltage. The energy absorbing device is preferably variable regarding an absorption of electrical braking power of the three-phase drive machine.
Abstract:
본 발명은 교류 네트워크를 갖는 시설을 위한, 특히 선박 또는 근해 플랫폼을 위한 구동 시스템으로서, 모터 및 발전기 모두로서 동작할 수 있는 3상 구동 기계(8)를 포함하며, 중간 회로 전압(U z )을 갖는 직류 중간 회로(5)를 갖는 컨버터(2)를 포함하는 구동 시스템에 관한 것이다. 본 발명은 교류 네트워크에서 원하지 않는 및/또는 허용할 수 없는 전압 및/또는 주파수 증가를 방지하기 위한 방법을 제공한다. 이 목적을 위해, 구동 시스템은 본 발명에 따라 중간 회로(5) 내에 배열된 에너지 흡수 장치(20)를 포함하며, 에너지 흡수 장치는 적어도 하나의 에너지 흡수체(21)를 포함하며, 이 에너지 흡수체는 바람직하게는 3상 구동 기계(8)가 발전기 동작에서 생성하고 컨버터(2)의 모터측 전류 컨버터(4)에 의해 중간 회로(5)로 출력하는 전기 에너지의 적어도 일부분을 흡수하기 위한 적어도 하나의 전기 저항을 포함한다. 에너지 흡수체(21)는 중간 회로 전압(U z )의 극성에 따라 에너지 흡수 장치(20)에 의해 활성화될 수 있다. 에너지 흡수 장치(20)는 바람직하게는 3상 구동 기계(8)의 전기 제동력의 흡수에 관해 변경 가능하다.
Abstract:
본 발명은 가속페달이 눌려진 정도에 따라 전동기의 출력을 변화시키는 전동기용 인버팅 방법으로서, 회전자에 고정된 위치표시판의 위치를 적외선 센서로 검출하는 위치검출단계, 상기 위치표시판의 위치에 따라 인버터에 포함된 사이리스터를 개폐하며 가속페달이 눌려진 정도에 따라 상기 사이리스터의 개폐속도를 제어하는 속도제어단계, 전원으로부터 공급된 직류를 교류로 변환하고 상기 제어된 사이리스트의 개폐속도에 따라 상기 변환된 교류 주파수 및 전동기에 공급되는 전류량을 변화시키는 교류변환단계 및 상기 인버터의 사이리스터에 의해 공급된 교류를 회전동력으로 변환하고 상기 공급된 교류 주파수 및 전류량에 따라 전동기의 출력을 변화시키는 출력변환단계로 구성된 전동기용 인버터 시스템 및 인버팅방법에 관한 것이다. 인버터, 사이리스터, 3상유도전동기, 슬립, 자동차, 연료전지