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This paper describes a GTO PWM inverter and induction motor driving system. This system is consists of three-phase GTO inverter, three-phase controlled rectifier, control processing units. Microprocessor(Z-80) is used to generate PWM control signals for the inverter generating three-phase sine-wave. The drive system of micropocessor based sinusoidal PWM inverter control for the induction motor offers many adventages such as control of the V/F ratio at GTO switching, improvement of waveforms and chimney, widerange and actuate speed control, and real time control of the drive system.
The mixed subject and the interracial family are often discussed in Asian American literature as possibilities to deconstruct the racial boundaries in the US. This paper, however, explores Celeste Ng's Everything I Never Told You in a way that suggests those issues can be more complicated when racism itself is entangled with the establishment of the interracial family and particularly affects the mixed children in the white-centered community. In describing the interracial Lee's family, the novel focuses on how racism is related to interracial marriage and how parents' racialized desire for assimilation devastates their mixed children, who struggle to survive in the white-centered mainstream society. With their own racialized desire, Marilyn and James attempt to establish an idealized interracial family, but their desire is entirely subverted when James witnesses racism in the family. Lydia Lee, with the interracial ground, fails to follow her parents' requests to become a model minority student for assimilation into the mainstream society. Being drowned to death, she reveals the impossibilities of becoming a model minority student and crossing the racial boundaries.
This paper presents an implementation of position control system of Switched Reluctance Motor (SRM) using digital hysteresis controller by TMS320F740 DSP. Although SRM possess several advantages including simple structure and high efficiency, but the control thrive system using power semiconductor device is required to drive this motor. The control drive system increases overall system cost. To overcome this problem and increase the application of SRM, it is needed to develope the servo dave system of SRM. So, the position control system of 1 Hp SRM is developed and evacuated by adaptive switching angle control. The position/speed response characteristics and voltage/current waveforms are presented to prove the capability of SRM for a servo drive application. Moreover, digital hysteresis current controller is developed and evaluated by experimental testing for the purpose of system developmental cost reduction.
This paper presents a position sensorless control system of Switched Reluctance Motor (SRM) using neural network. The control of SRM depends on the commutation of the stator phases in synchronism with the rotor position. The position sensing requirement increases the overall cost and complexity. In this paper, the current-flux-rotor position lookup table based position sensorless operation of SRM is presented. Neural network is used to construct the current-flux-rotor position lookup table, and is trained by sufficient experimental data. Experimental results for a 1-hp SRM is presented for the verification of the proposed sensorless algorithm. 본 논문에서는 신경회로망을 이용한 위치센서 없는 스위치드 릴럭턴스 전동기의 제어시스템에 관해 연구하였다. 스위치드 릴럭턴스 전동기는 회전자 위치에 따라 적정 고정자 권선을 여자시킴으로써 회전력을 발생하기 때문에 회전자 위치정보가 필수적이다. 회전자 위치추정을 위한 위치 검출기는 전반적인 시스템 비용을 증가시키고, 시스템이 복잡해지는 요인이 된다. 본 논문에서는 전류와 자속에 대한 회전자 위치정보의 룩업 테이블을 바탕으로 위치센서 없는 스위치드 릴럭턴스 전동기의 제어에 관해 연구하였다. 신경회로망은 실험을 통해 구해진 데이터를 바탕으로 회전자 위치추정을 위한 근사함수의 유도를 위해 활용되었으며, 학습된 신경회로망을 이용하여 룩업 테이블을 구성하였다. 제안된 센서리스 알고리즘은 1마력 SRM에 적용되었으며, 실험 및 시뮬레이션을 통해 실현 가능성이 확인되었다.
최근 급속도로 발전된 산업분야에서 요구되는 서보 시스템에서의 빠른 응답특성과 고도의 정밀성을 구현하기 위하여 고속의 연산을 수행할 수 있는 DSP(Digital Signal Processor)의 사용이 필수적이다. 그러나 기존의 DSP는 고속의 연산을 주력으로 전동기 제어에 필요한 PWM 게이팅 발생 장치와 엔코더 입력 장치, ADC(Analog to Digital Converter)등의 주변 장치를 포함하지 않았다. 이러한 추가적인 주변회로로 인한 제어 회로의 복잡성과 보드의 대형화 및 생산단가 상승의 요인으로 작용하였다. 따라서 본 논문에서는 연산 능력이 기존의 DSP에 뒤지지 않으며 전동기 제어 주변회로를 포함하고 있는 TMS320F2812 DSP를 사용하여 현재 산업 현장에서 사용되고 있는 SPMSM 서보 시스템을 제어하여 기존 제어기의 주변회로로 인한 문제점을 해결하고자 한다. This paper presents a SPMSM(Surface-mounted Permanent Magnet Synchronous Motor) servo drive system using high performance TMS320F2812 DSP for the industrial application. The DSP(Digital Signal Processor) Controller enables an enhanced real time algorithm and cost-effective design intelligent for only exclusively motor drives which can be yield enhanced operation, fewer system components, lower control system cost, increased efficiency and high performance. The suggested system contain speed and current sensing circuits, SVPWM(Space Vector Pulse Width Modulation) and I/O interface circuit. The developed servo drive control system showns a good response characteristics results and high performance features in general purposed 400[W] machine. This system can achieve cost reduction and size minimization of controllers.
The paper describes transient speed response characteristics for induction motor driver by slip-frequency vector control system. This system is consists of three-phase PWM inverter, current vector calculation and controller, experimental device with analog method. In order to replace DC servo drive system (DC motor) by a high-performance AC system with induction motor, it is compose to field oriented control system and designed a analog circuits of vector control. In this method, simplicity and superiority of the proposed drive control scheme is experimentally verified, and is similar to that of a DC servo motor.
The purpose of the paper is to operate a high-dynamic-performance for AC servo system. It is described characteristic and stability regions by linearized control system of squarriel-cage induction motor. The proposed control system is composed to slip-frequency vector control for controlled a secodary interlinked flux by PWM inverter.
Frank Chin is often considered as the first generation of Chinese American writers who attacks dual identity concept with the male-centered narrative to create the mode of cultural nationalistic movement during the 1960s to the 1970s. His Donald Duk, published in 1991, also reveals the author`s male-centered and cultural nationalistic perspective toward Asian American identity by reinforcing what is defined to be Chinese. The heritage based on Chineseness is particularly focused in a way that King Duk, a father of Donald Duk, descends the heritage to Donald in the formation of his ethnic identity. In doing so, he attempts to retain the notion of the male-centered Chineseness as a necessary thing, which is closely conversant with the ideas of the first generation of Asian American writers who have strongly argued that Asian American identity should be formed not only by the notion of nationalistic culture but also by the firmness of the male-centered ideology. His attempt to build such identity through the young American-born Chinese American Donald Duk. He, however, significantly violates the notion of multiculturalism and rather determines the dual identity of Asian American based on race, gender and culture. He even fails to discuss the issue of the other and gender in his work but shows us how he reinforces the notion of Chineseness in the author`s patriarchical attempt to place it at the center of the American society. In this process of creating the male-centered notion of Chineseness, he severely erases the presence of female characters who are victimized as a “uncanny marker" marginalized from the Chinese community.