doubly fed induction generator in a wind turbine
... shown below. Because the mass of the shaft itself is very small, seen from the generator, it is reduced to zero. The inertia at the turbine gives a negative contribution to the torque when the generator is in generating mode. ...
... shown below. Because the mass of the shaft itself is very small, seen from the generator, it is reduced to zero. The inertia at the turbine gives a negative contribution to the torque when the generator is in generating mode. ...
IOSR Journal of Electrical and Electronics Engineering (IOSRJEEE)
... redundancy has also been exploited to achieve better drive reliability. The split-wound synchronous machine with either round or salient-pole rotor structure has two similar but separate three-phase windings wound for the same number of poles [7]. PM motors operated as brushless dc (BLDC) drives hav ...
... redundancy has also been exploited to achieve better drive reliability. The split-wound synchronous machine with either round or salient-pole rotor structure has two similar but separate three-phase windings wound for the same number of poles [7]. PM motors operated as brushless dc (BLDC) drives hav ...
Synchronous generators
... due to permanent magnets mounted in the rotor or this magnetic field is due to electromagnets mounted in the rotor and fed by a DC current. By controlling this DC current, the induction of this magnetic field can be controlled (which is not possible when using permanent magnets). Synchronous generat ...
... due to permanent magnets mounted in the rotor or this magnetic field is due to electromagnets mounted in the rotor and fed by a DC current. By controlling this DC current, the induction of this magnetic field can be controlled (which is not possible when using permanent magnets). Synchronous generat ...
Fairford Sizing Generators for Soft Starters
... 2 Many loads have low breakaway torque requirements as, for example, centrifugal pumps, fans, rotary compressors, chillers etc., and can often be turned by hand when stationary. Although these loads place little demand on the power supply at start up and acceleration, it ...
... 2 Many loads have low breakaway torque requirements as, for example, centrifugal pumps, fans, rotary compressors, chillers etc., and can often be turned by hand when stationary. Although these loads place little demand on the power supply at start up and acceleration, it ...
M1 M1 Start Stop M1 motor To 3-phase power source F1 F2 OL OL
... In particular, what it the function of the two normally-closed “M” contacts (called interlock contacts) in the control circuit? What do you think might happen if those contacts were not there? Suggestions for Socratic discussion • Explain why reversing any two phase conductors supplying AC power to ...
... In particular, what it the function of the two normally-closed “M” contacts (called interlock contacts) in the control circuit? What do you think might happen if those contacts were not there? Suggestions for Socratic discussion • Explain why reversing any two phase conductors supplying AC power to ...
Step Motors
... The switches shown in Fig.2 are essential for energising the coils of the step motor. In present day applications, semiconductor switches are universally employed fro this purpose. A typical transistor switch arrangement is shown in Fig.6(a). A positive going pulse will turn on the transistor and en ...
... The switches shown in Fig.2 are essential for energising the coils of the step motor. In present day applications, semiconductor switches are universally employed fro this purpose. A typical transistor switch arrangement is shown in Fig.6(a). A positive going pulse will turn on the transistor and en ...
Synchronous Machines
... the difficulty involved in transmitting large currents via the brushes, limit the maximum power output and the generated electromagnetic field (emf). This type is only used in small units, and its main application is as the main exciter in large alternators with brushless excitation systems. 2.2. Ro ...
... the difficulty involved in transmitting large currents via the brushes, limit the maximum power output and the generated electromagnetic field (emf). This type is only used in small units, and its main application is as the main exciter in large alternators with brushless excitation systems. 2.2. Ro ...
Analogical Modelling and Numerical Simulation of the Single
... This work shows a method of analogical modelling and numerical simulation based on state variables and Taylor series of the single-phase resolver in LabVIEW. Main advantage of this method is that it can increase the accuracy of the output voltage (u2) by increasing the order of derivatives. Certainl ...
... This work shows a method of analogical modelling and numerical simulation based on state variables and Taylor series of the single-phase resolver in LabVIEW. Main advantage of this method is that it can increase the accuracy of the output voltage (u2) by increasing the order of derivatives. Certainl ...
Department of Electrical Engineering, Southern Taiwan University
... In the proposed method, only three narrow voltage pulses have been applied to the phase windings to determine the rotor position, and a 30◦ resolution has been achieved. Additionally, only one sensing resistor has been added into a typical BLDC drive. It is particularly suitable for sensorless BLDC ...
... In the proposed method, only three narrow voltage pulses have been applied to the phase windings to determine the rotor position, and a 30◦ resolution has been achieved. Additionally, only one sensing resistor has been added into a typical BLDC drive. It is particularly suitable for sensorless BLDC ...
here - Stepper Motor Controllers
... preferable variable output from 10 to 40VDC,maximum output current 1Ampere or more. A bipolar stepper motor with rated current less than 1Ampere and rated voltage less than 20V. The nominal drive current is 415mA, with a simple modification on the value of the current sensing resistors you can adapt ...
... preferable variable output from 10 to 40VDC,maximum output current 1Ampere or more. A bipolar stepper motor with rated current less than 1Ampere and rated voltage less than 20V. The nominal drive current is 415mA, with a simple modification on the value of the current sensing resistors you can adapt ...
Zahn, M., and J.K. Skinner, Novel Self-excited Alternating Operation of Coupled Commutator Machines, Journal of the Franklin Institute 296, 1-13, 1973
... reflects itself in the equivalent circuit of Fig. 1 as the inductances as well as the speed coefficient G are not constant but functions of the currents. Thus for time-varying conditions, such as during the voltage build-up in a self-excited generator, the differential equations are nonlinear. For t ...
... reflects itself in the equivalent circuit of Fig. 1 as the inductances as well as the speed coefficient G are not constant but functions of the currents. Thus for time-varying conditions, such as during the voltage build-up in a self-excited generator, the differential equations are nonlinear. For t ...
EDE1204 Bi-Polar Stepper Motor IC EDE1204
... 10) line must be left high. Each low-going pulse on the STEP (pin 9) line causes a movement of the motor according to the Direction and Half-step pins as specified below: Direction (pin 7): 1 = clockwise, 0 = counter-clockwise (If a clockwise command causes counterclockwise rotation of motor, revers ...
... 10) line must be left high. Each low-going pulse on the STEP (pin 9) line causes a movement of the motor according to the Direction and Half-step pins as specified below: Direction (pin 7): 1 = clockwise, 0 = counter-clockwise (If a clockwise command causes counterclockwise rotation of motor, revers ...
PmodHB5™ Reference Manual Overview 1 Functional Description 2
... The PmodHB5 utilizes a full H-Bridge circuit to allow users to drive DC motors from the system board. Two sensor feedback pins are incorporated into the motor connection header and are specifically designed to work with the Digilent motor/gearbox. ...
... The PmodHB5 utilizes a full H-Bridge circuit to allow users to drive DC motors from the system board. Two sensor feedback pins are incorporated into the motor connection header and are specifically designed to work with the Digilent motor/gearbox. ...
Aalborg Universitet Permanent Magnet Synchronous Motors
... path), and consequently, a decrease in the winding inductance. A 2D model assumes the same geometry and material property on the direction perpendicular to the 2D plan. Such a model with conductivity assigned on the rotor side assumes the rotor is constructed by a bulk material. Many motors used in ...
... path), and consequently, a decrease in the winding inductance. A 2D model assumes the same geometry and material property on the direction perpendicular to the 2D plan. Such a model with conductivity assigned on the rotor side assumes the rotor is constructed by a bulk material. Many motors used in ...
BDTIC I Implementing Complex Motor Control Algorithms
... The sinusoidally distributed windings in the stator are similar to what would be found in a three-phase induction motor. In single phase (e.g. phase A) the number of turns of wire at any angle (α) is approximately NS cos(α). The other two phases are identical, but shifted 120 degrees. In reality, th ...
... The sinusoidally distributed windings in the stator are similar to what would be found in a three-phase induction motor. In single phase (e.g. phase A) the number of turns of wire at any angle (α) is approximately NS cos(α). The other two phases are identical, but shifted 120 degrees. In reality, th ...
Beakman`s Motor - Rensselaer Polytechnic Institute
... use any design you wish for your spring as long as the metal of the spring does not make electrical contact between the coil and the battery. Any kind of insulated wire can be used as long as the insulation is not removed. Using a spring of this type will take some adjustment to get right – somethin ...
... use any design you wish for your spring as long as the metal of the spring does not make electrical contact between the coil and the battery. Any kind of insulated wire can be used as long as the insulation is not removed. Using a spring of this type will take some adjustment to get right – somethin ...
Doubly fed induction generator systems for wind turbines
... power (Table 1). It is anticipated that in the near future, power rating of wind turbines will increase further, especially in offshore applications. For example, the prototype of a Nordex N80 with a rated power of 2.5 MW was installed in March 2000 near Aachen. Many low-power wind turbines built to ...
... power (Table 1). It is anticipated that in the near future, power rating of wind turbines will increase further, especially in offshore applications. For example, the prototype of a Nordex N80 with a rated power of 2.5 MW was installed in March 2000 near Aachen. Many low-power wind turbines built to ...
Starting Time Calculation for Induction Motor
... the heavy applications requirement. Some are considered large even in comparison to the total capacity of large industrial power systems. Starting of such large motors can cause adverse effects to any locally connected load, other motors and also to buses, which are electrically remote from the poin ...
... the heavy applications requirement. Some are considered large even in comparison to the total capacity of large industrial power systems. Starting of such large motors can cause adverse effects to any locally connected load, other motors and also to buses, which are electrically remote from the poin ...
Performance Analysis of Four Leg Voltage Source Inverter Fed
... Two phase induction motor has been extensively used in low power applications like home appliances and industrial applications requiring power consumption less than 2.5KW[1]. Two-phase induction motors have identical configuration as single-phase induction motors, as in both cases stator windings ar ...
... Two phase induction motor has been extensively used in low power applications like home appliances and industrial applications requiring power consumption less than 2.5KW[1]. Two-phase induction motors have identical configuration as single-phase induction motors, as in both cases stator windings ar ...
開啟檔案
... 1.解決以前只能控制high or low duty的情況。 2.不需要使用任何hall or position sensor=用未激磁相量測到 的端電壓來計算反電動勢的零交越點，產生正確的換相控制。 3.容易使用數位系統來實現=使用FPGA架構來實現BLDC Driver System。 ...
... 1.解決以前只能控制high or low duty的情況。 2.不需要使用任何hall or position sensor=用未激磁相量測到 的端電壓來計算反電動勢的零交越點，產生正確的換相控制。 3.容易使用數位系統來實現=使用FPGA架構來實現BLDC Driver System。 ...
Design of a Brushless Separately Excited Synchronous Motor
... depending on speed torque and battery voltage is stored in the main inverter ...
... depending on speed torque and battery voltage is stored in the main inverter ...
AC motor
An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts, an outside stationary stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field. The rotor magnetic field may be produced by permanent magnets, reluctance saliency, or DC or AC electrical windings.Less commonly, linear AC motors operate on similar principles as rotating motors but have their stationary and moving parts arranged in a straight line configuration, producing linear motion instead of rotation.