harmonic mitigation in wind turbine energy conversion systems
... the capability of to work as an ideal PFC, with very low THD at any operation point. Hence, it is investigated in this work in order to overcome the disadvantages presented by the single-switch three-phase boost rectifier. The converter topology has six two-quadrant controlled switches each one impl ...
... the capability of to work as an ideal PFC, with very low THD at any operation point. Hence, it is investigated in this work in order to overcome the disadvantages presented by the single-switch three-phase boost rectifier. The converter topology has six two-quadrant controlled switches each one impl ...
Topic 2 - Sciwebhop.net
... (ii) The current produced would be a varying direct current (dc). What changes would be needed for the generator to produce an alternating current (ac) instead ? ...
... (ii) The current produced would be a varying direct current (dc). What changes would be needed for the generator to produce an alternating current (ac) instead ? ...
The closed-loop control of a three-phase inverter Frasz, Derek P.
... port main bus supply high voltage DC power to each zone within the ship. The anticipated voltage levels range from 1200V to 2000V, as dictated by available semiconductor switch technology. A power converter buffers the main: bus and the intra-zone electrical loads, as it steps down the voltage to a ...
... port main bus supply high voltage DC power to each zone within the ship. The anticipated voltage levels range from 1200V to 2000V, as dictated by available semiconductor switch technology. A power converter buffers the main: bus and the intra-zone electrical loads, as it steps down the voltage to a ...
G047033138
... In this paper, a buck half-bridge DC-DC converter is used as a single-stage power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (BLDC) drive. The front end of this PFC converter is a diode bridge rectifier (DBR) fed from singl ...
... In this paper, a buck half-bridge DC-DC converter is used as a single-stage power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (BLDC) drive. The front end of this PFC converter is a diode bridge rectifier (DBR) fed from singl ...
motors in parallel
... ● This problem is generally above than 400V and for motors not having insulation compatible with variable speed drives (class F). ● Overvoltages can be destructive with cable lengths of 20 meters or above. ● The can be greater than 2Vdc in the case of PWM with short tmin (ex 2µS for 200m 4kW) ...
... ● This problem is generally above than 400V and for motors not having insulation compatible with variable speed drives (class F). ● Overvoltages can be destructive with cable lengths of 20 meters or above. ● The can be greater than 2Vdc in the case of PWM with short tmin (ex 2µS for 200m 4kW) ...
AC and DC Drives for Oil Drilling
... Generally speaking, for example, a 4000 m drill needs three diesel generators. To save energy, not all of those diesel generators run simultaneously, the generators are manually operated. This means that the drives can demand more power than is currently available. In this case the diesel generator ...
... Generally speaking, for example, a 4000 m drill needs three diesel generators. To save energy, not all of those diesel generators run simultaneously, the generators are manually operated. This means that the drives can demand more power than is currently available. In this case the diesel generator ...
Microelectromechanical Devices
... torque component of current iqs and the second figure shows an increase in the flux component of current, ids. Because of the orthogonal orientation of these components, the torque and flux can be controlled independently. However, it is necessary to maintain these vector orientations under all oper ...
... torque component of current iqs and the second figure shows an increase in the flux component of current, ids. Because of the orthogonal orientation of these components, the torque and flux can be controlled independently. However, it is necessary to maintain these vector orientations under all oper ...
Auto-Electric Basic Technology - Part 2
... Magnetism we do find in nature mostly as permanent magnets. Magnets attract iron filings (and nickel & cobalt). In the vicinity of the magnet there is a magnetic field with a definite direction, which is strongest at the ends of the magnet. See below the field lines of permanent magnet bar: ...
... Magnetism we do find in nature mostly as permanent magnets. Magnets attract iron filings (and nickel & cobalt). In the vicinity of the magnet there is a magnetic field with a definite direction, which is strongest at the ends of the magnet. See below the field lines of permanent magnet bar: ...
DC Machines
... are also associated with magnetic field like a load stone. This led to the invention of an electromagnet. Hardly a year later the force exerted on a current carrying conductor placed in the magnetic field was invented. This can be termed as the birth of a motor. A better understanding of the inter r ...
... are also associated with magnetic field like a load stone. This led to the invention of an electromagnet. Hardly a year later the force exerted on a current carrying conductor placed in the magnetic field was invented. This can be termed as the birth of a motor. A better understanding of the inter r ...
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)
... Shopping trolley is also called shopping cart which is like a carriage or basket that can be used by customers to transport their purchased product inside grocery shops or supermarkets. The shopping trolley is a cart supplied by supermarkets. In united stated, supermarket workers will return the tro ...
... Shopping trolley is also called shopping cart which is like a carriage or basket that can be used by customers to transport their purchased product inside grocery shops or supermarkets. The shopping trolley is a cart supplied by supermarkets. In united stated, supermarket workers will return the tro ...
Portfolio Template - Schuylkill Technology Center
... Measure single-phase transformer voltage and currents. Measure series / parallel transformer voltages and currents. Demonstrate knowledge of three-phase transformers. OPERATION OF A THREE PHASE SYSTEM (Level 3 & 4) Understand and be able to connect the WYE and DELTA systems and the various configura ...
... Measure single-phase transformer voltage and currents. Measure series / parallel transformer voltages and currents. Demonstrate knowledge of three-phase transformers. OPERATION OF A THREE PHASE SYSTEM (Level 3 & 4) Understand and be able to connect the WYE and DELTA systems and the various configura ...
The Impact That Voltage Variations Have on AC Induction
... voltage is unbalanced. If the voltage unbalance should be extremely severe, the torques might not be adequate for the application. The torque may still be adequate on variable torque applications, such as pumps and fans. However, on constant torque applications, such as conveyers, there can be accel ...
... voltage is unbalanced. If the voltage unbalance should be extremely severe, the torques might not be adequate for the application. The torque may still be adequate on variable torque applications, such as pumps and fans. However, on constant torque applications, such as conveyers, there can be accel ...
Teaching Faraday`s law of electromagnetic induction in
... qualitatively correct way even in an introductory course.14,15 In this context it is important to demonstrate by a simple example that the distinction between the two types of emf’s is not absolute. The motional emf’s detected by an inertial observer may appear as a transformer emf to another observ ...
... qualitatively correct way even in an introductory course.14,15 In this context it is important to demonstrate by a simple example that the distinction between the two types of emf’s is not absolute. The motional emf’s detected by an inertial observer may appear as a transformer emf to another observ ...
Induction motor
An induction or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.Three-phase squirrel-cage induction motors are widely used in industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFDs) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive (VFD) applications. Variable voltage and variable frequency drives are also used in variable-speed service.