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In this paper, author consider the nonlinear control by using feedback linearization for independent control and estimation algorithm such as speed, rotor flux and rotor resistance to achieve sensorless control of induction motor.<br/> The dynamic characteristics of the proposed nonlinear control algorithm is verified by simulation.
Fractional horse power single phase induction motors have no starting torque on their own. So, there are several ways of starting single phase induction motors. The most common type is the starting capacitor installed in series with the auxiliary winding to increase the starting torque. Also, the auxiliary winding was disconnected once the speed of the motor reaches 70 to 80%. In the conventional systems, this function was conducted by a centrifugal switch. But the mechanical centrifugal switch has many problems such as switch malfunction. Therefore, this results poposed the new methods of electronic starter switch by topologies to overcome these shortcomings of centrifugal switch.
The single phase induction motor(SPIM) with two windings, main and auxiliary winding, is widely used due to ruggedness, low maintenance and simplicity of construction^ There are several ways of starting single phase induction motor. The most common method is to use centrifugal switch that is connected in series with a capacitor But the centrifugal switch that is the external starting system has many problems<br/> In this paper, we use triac to overcome defects that happen by centrifugal switch, Also we used inductor that connected with main winding to get a gate trigger voltage signal. Experiments are focused on a capacitor starting single phase induction motor.
The oxidation rates of WC and WC-Ni hard alloys containing 2,4 and 6% Ni as a binder were determined by means of a magnetic balance apparatus. The relationships between the characteristics of the oxide films and the oxidation rates were also studied with the help of SEM and X-ray diffraction technique. WC and WC-Ni hard alloys weve oxidized at 560-830℃ under two different oxygen pressures (2.6×10^(-2) and 1.3×10^(-1) Pa). The reactions were parabolic during initial stages and linear after 30 min. The oxidation rates increased with temperature and reached a maximum at about 740℃ in 2.6×10^(-2) Pa O₂ and at about 650℃ in 1.3 ×10^(-1) Pa O₂, after which the rate decreased with temperature. It waa identified by X-ray diffraction method that WO₃ was formed in the low temperature and W_(18)O_(49) in the high temperature. The decreased oxidation rate was associated with more protective characteristics of W_(18)O_(49) than WO₃. Adding Ni in WC transformed the paralinear rate of WC only to parabolic rate. The oxidation rate decreased with increasing Ni concentration. Under above conditions the oxide scale was consisted of mainly double oxide NiWO₄, which was dense and protective film.
Purpose: The fourth state of matter, plasma is known as an ionized gas with electrons, radicals and ions. The use of non-thermal plasma (NTP) in cancer research became possible because of the progresses in plasma medicine. Previous studies on the potentialNTP-mediated cancer therapy have mainly concentrated on cancer cell apoptosis. In the present study, we compared the inhibitoryeffect of NTP on cell migration and invasion in the oral squamous cancer cell lines. Materials and Methods: We used oral squamous cancer cell lines (SCC1483, MSKQLL1) and different gases (N2, He, and Ar). To investigate the mechanism of plasma treatment, using different gases (N2, He, and Ar) which induces anti-migration and anti-invasionproperties, we performed wound healing assay, invasion assay and gelatin zymography. Results: The results showed that NTP inhibits cancer cell migration and invasion of oral squamous cancer cell. In addition, focal adhesion kinase expression and matrix metalloproteinase-2/9 activity were also inhibited. Conclusion: The suppression of cancer cell invasion by NTP varied depending on the type of gas. Comparison of the three gases revealed that N2 NTP inhibited cell migration and invasion most potently via decreased expression of focal adhesion kinase and matrix metalloproteinase activity.
DSM-CC U-U (User-to-User) 인터페이스는 다양한 광대역 멀티미디어 서비스 환경에서 멀티미디어 응용들을 제공하기 위하여 요구되는 동작들을 정의한 개방형 프로토콜이다. 본 연구에서는 DSM-CC U-U 인터페이스를 시험하기 위한 적합성 시험방법을 제시하고, 선택된 적합성 시험구조를 위한 적합성 추상시험항목들 (Abstract Test Cases)을 도출한다.