speed control of ac motor using scr circuit diagram

Ngày tải lên: 18/12/2013, 22:06

Ngày tải lên: 15/10/2013, 16:10

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Ngày tải lên: 12/08/2014, 18:21

Ngày tải lên: 12/10/2014, 08:30

... simple linear circuit can represent each of the two states where the switches in the circuit are replaced by their equivalent circuit during each state. The circuit diagram for each of the two ... variable -speed control can adjust the speed of the turbine as the wind speed changes, so as to operate at the peak of the Cp curve. This will maximize the power generated for a particular wind speed, ... of the wind speed, the control of the buck- boost converter perturbs periodically the operating point of the wind turbine. By acquiring the output voltage and current of PMSG, the control used...

Ngày tải lên: 03/01/2014, 19:15

Ngày tải lên: 18/12/2013, 09:10

Ngày tải lên: 03/01/2014, 19:44

Ngày tải lên: 03/01/2014, 19:44

... Fig. 2: Block diagram of the direct torque and indirect flux control of four-switch BLDC motor drive using three-phase conduction mode without position ... shapes require very fast controllers in particular at high speed. Classical bandwidth of the controller (such as proportional– integral) does not allow tracking all of the reference current ... and effectiveness of the sensorless three-phase conduction DTC of a BLDC motor drive with six-switch inverter. 2. The Proposed Sensorless DTC of Four-Switch BLDC Motor Drive Using Three-Phase...

Ngày tải lên: 03/01/2014, 19:45

... flux control is performed by controlling the flux related d-axis current using bang-bang (hysteresis) con- trol, which provides acceptable control of time-varying signals (reference and/or feedback) ... flux control are of primary concern for BLDC motors with nonsinusoidal back Manuscript received May 30, 2009; revised September 11, 2009 and January 2, 2010; accepted February 6, 2010. Date of ... analysis and design of electrical machines, variable -speed drives for traction and propulsion applications, fault diagnosis of electric machinery, and sensorless variable -speed drives. He has supervised...

Ngày tải lên: 03/01/2014, 19:46

... characteristics. Furthermore, to eliminate the low-frequency torque oscillations caused by the non-ideal trapezoidal shape of the actual back-EMF waveform of the BLDC motor, pre-stored back-EMF ... possible to achieve two-phase conduction DTC of a BLDC motor drive using four-switch inverter with faster torque response due to the fact that the voltage space vectors are directly controlled. ... characteristics. Furthermore, to eliminate the low-frequency torque oscillations caused by the non-ideal trapezoidal shape of the actual back-EMF waveform of the BLDC motor, a pre-stored back-EMF...

Ngày tải lên: 03/01/2014, 19:46

... A schematic diagram of a DC motor is shown in Figure 6. Figure 6. Schematic Diagram of a DC Motor Mechatronics Kevin Craig DC Motor / Tachometer Closed-Loop Speed Control System ... Furthermore, the control of AC actuators was a difficult task at that time. Today, AC motors are also widely used as servo-motors, employing modern methods of phase- voltage control and frequency control ... DC Motor / Tachometer Closed-Loop Speed Control System 8 In the early days of analog control, servo-actuators (actuators that automatically use response signals from a process in feedback...

Ngày tải lên: 25/01/2014, 13:20

... <CR> (giá trị 13 trong bảng mã ACCII). Thông tin trả về từ modem luôn được bắt đầu và kết thúc bởi 2 ký tự đi kèm <CR><LF>(giá trị 13 và 10 trong mã ACCII). - Nếu lệnh truyển cho ... InSQL, Oracle, SQL) và các cơ sở dữ liệu khác hỗ trợ DDE. Bên cạnh các hệ thống điều khiển sử dụng tin nhắn SMS còn có các hệ thống sử dụng giao thức truyền dữ liệu GPRS (General Packet Radio ... khiển; + Chế độ tiết kiệm năng lượng (Sleep Mode); + Nạp chương trình bằng cổng nối tiếp ICSP (In -Circuit Serial Programing); + Nguồn dao động lập trình được tạo bằng công nghệ CMOS; + 1 bộ biến...

Ngày tải lên: 29/03/2014, 15:20

... understanding of the mechanism underlying speech motor control. However, there is a lack of literature in quantitative measures of motor control, which may potentially characterize the nature of the ... study of speech motor control in children with CP. The lack of this type of research on CP children may be due to the technical difficulty of managing movement artifacts due to head or trunk control ... dysarthria of varying severities. One of the primary c haracteristics of dysarthria is articulatory imprecision [5]. Some fairly stable features of CP dysarthria include inaccurate articulatory place...

Ngày tải lên: 19/06/2014, 08:20

... 1(b’). This result indicated that the size of the surface structure transition can be controlled by the amount of voltage, and it needs at least 150°C. Surface Structure Transition at 240°C Without ... current, and a scan speed) for each case. During the observation, an STM tip scanned from left to right and moved from bottom to top of the image. After a thermal drift reducing, using the STM tip, ... collapse of the dot structures were caused by the high mobility of In atoms at this temperature [11–14]. Surface Structure Transition at 300°C Under As 4 and In Irradiations To prevent the collapse of...

Ngày tải lên: 21/06/2014, 08:20

... tightly controlled for reproduc- ible position control of the quantum dots. In the present work, we report on in situ control of Si and Ge growth on stripe-patterned Si (001) substrates using reflection ... exactly to the sidewall tilt angle on the pattern surface. Their appearance thus indi- cates a rapid flattening of the sidewalls surfaces and a preferential orientation toward {113} surface facets, ... Continuation of buffer growth, results in the appearance of faint additional diffraction streaks inclined by 25° to the surface normal, as indicated by the dashed lines in the RHEED pattern of Fig....

Ngày tải lên: 21/06/2014, 08:20

... identified to trace a crack of 1-1.5” length. This fitted line is then uploaded to the controller of the x-y table for position and welding speed control. Linear motors are used as the driving motors ... variation of speed of the x-y table as the crack is being traced. Once they are finished tracing the crack, the linear motors return to their original positions. We can compare the smoothness of ... identified to trace a crack of 1-1.5” length. This fitted line is then uploaded to the controller of the x-y table for position and welding speed control. Linear motors are used as the driving motors...

Ngày tải lên: 27/07/2014, 23:31

Ngày tải lên: 11/08/2014, 12:20