Generation torque analysis of brushless DC motor
... 2. The average torque will be maximised by a lead commutation with about half the phase current commutation time. 3. The commutation time is a function of machine parameters and directly affects the rotating speed. Therefore, the timing to generate the maximum torque is changed by the operating spee ...
... 2. The average torque will be maximised by a lead commutation with about half the phase current commutation time. 3. The commutation time is a function of machine parameters and directly affects the rotating speed. Therefore, the timing to generate the maximum torque is changed by the operating spee ...
changing magnetic field
... power is sent across long transmission lines at ______ HIGH voltages. WHY? If the voltage is high, the current will be relatively ____, low so there will be less power loss in the lines. ...
... power is sent across long transmission lines at ______ HIGH voltages. WHY? If the voltage is high, the current will be relatively ____, low so there will be less power loss in the lines. ...
Iris Power PDAlert Bantam PD Detection During Short Risetime Voltage Surges
... inverters using IGBTs/IGCTs in the early 1990s created a new stator winding failure mechanism in motors rated as low as 440 V. In “random wound” motor stator windings typical of motors rated less than 1000 V, partial discharges were found to occur due to the short risetimes of the voltage impulses. ...
... inverters using IGBTs/IGCTs in the early 1990s created a new stator winding failure mechanism in motors rated as low as 440 V. In “random wound” motor stator windings typical of motors rated less than 1000 V, partial discharges were found to occur due to the short risetimes of the voltage impulses. ...
BC33315326
... can also absorb excess power in case of lightly load condition and thus the Statcom acts both as a voltage and frequency controller. The control structure for a Statcom is based on Vector Control principle where synchronously rotating reference frame is considered.This reference frame is chosen as i ...
... can also absorb excess power in case of lightly load condition and thus the Statcom acts both as a voltage and frequency controller. The control structure for a Statcom is based on Vector Control principle where synchronously rotating reference frame is considered.This reference frame is chosen as i ...
Mechatronics Project 1 - NYU Tandon School of Engineering
... • If ramp input is selected, potentiometer selects grade of ramp – Steeper ramp to the left – Shallower ramp to the right ...
... • If ramp input is selected, potentiometer selects grade of ramp – Steeper ramp to the left – Shallower ramp to the right ...
Comparison of various Wind Turbine Generators
... two types. One is fixed speed wind turbine and another one is variable wind turbine. The most common type of wind turbine is the fixed-speed wind turbine with the induction generator directly connected to the grid. This system has a number of drawbacks, however. The reactive power and, therefore, th ...
... two types. One is fixed speed wind turbine and another one is variable wind turbine. The most common type of wind turbine is the fixed-speed wind turbine with the induction generator directly connected to the grid. This system has a number of drawbacks, however. The reactive power and, therefore, th ...
MBC15161 User`s Guide
... has an output current capability from 0.67 Amps Minimum to 1.5 Amps Maximum (Peak Rating). The MBC15161 driver will operate from 12VDC Minimum to 48VDC Maximum. The MBC15161 microstep division range is from 200 steps per revolution to 3200 steps per revolution. The driver has built-in Short Circuit ...
... has an output current capability from 0.67 Amps Minimum to 1.5 Amps Maximum (Peak Rating). The MBC15161 driver will operate from 12VDC Minimum to 48VDC Maximum. The MBC15161 microstep division range is from 200 steps per revolution to 3200 steps per revolution. The driver has built-in Short Circuit ...
Control Scheme of Standalone DFIG Wind Energy Conversion System
... suffered from is disconnecting it from the grid during fault occurrence. This occurs since the voltage drops at the point of interconnection of the wind turbine. They will be disconnected from the network if the voltage drops to 10-20 percent of nominal voltage. This situation underlies an increase ...
... suffered from is disconnecting it from the grid during fault occurrence. This occurs since the voltage drops at the point of interconnection of the wind turbine. They will be disconnected from the network if the voltage drops to 10-20 percent of nominal voltage. This situation underlies an increase ...
Power Electronics Design
... single person, especially if powered by electricity. The main reason for this is because of the relatively low performance of any of the batteries that currently exist. What is possible and highly efficient is for something along the lines of a motor scooter or motor cycle to be powered by an electr ...
... single person, especially if powered by electricity. The main reason for this is because of the relatively low performance of any of the batteries that currently exist. What is possible and highly efficient is for something along the lines of a motor scooter or motor cycle to be powered by an electr ...
variable frequency 101
... available to vary motor speed, however, frequency changes were limited because generator speed reduction lowered the output frequency but not the voltage. We will see why this is important a little later. In our industry, variable speed pumping applications were far more complex in the past than the ...
... available to vary motor speed, however, frequency changes were limited because generator speed reduction lowered the output frequency but not the voltage. We will see why this is important a little later. In our industry, variable speed pumping applications were far more complex in the past than the ...
What is GFCI Protection?
... The NEMA number on the plug and receptacle have to be identical, otherwise, they will not connect together. As long as the number matches, different brands with the same ratings are interchangeable. Devices called “pin and sleeve” are available for currents above 50 amps three-phase. These devices a ...
... The NEMA number on the plug and receptacle have to be identical, otherwise, they will not connect together. As long as the number matches, different brands with the same ratings are interchangeable. Devices called “pin and sleeve” are available for currents above 50 amps three-phase. These devices a ...
ECE 7800: Renewable Energy Systems
... fixed speed, these are referred to as asynchronous generators. The magnetic field in an induction machine is created in the stator winding by rotating the magnetic flux through windings in the stator. This induces a current and net motion in the conductors of the rotor. No slip rings or brushes are ...
... fixed speed, these are referred to as asynchronous generators. The magnetic field in an induction machine is created in the stator winding by rotating the magnetic flux through windings in the stator. This induces a current and net motion in the conductors of the rotor. No slip rings or brushes are ...
EE442 FE Spr 98-99 - faraday - Eastern Mediterranean University
... ( QSW ) mode ( phase displacement control ) at the frequency f = 100 Hz , with phase shift between half-bridge output voltages va and vb . The load is an R-L load with R = 10 and L = 10 mH . (a) For = 2 / 3 sketch vo and find its total harmonic dostortion THD . (b) For = 2 / 3 find approxi ...
... ( QSW ) mode ( phase displacement control ) at the frequency f = 100 Hz , with phase shift between half-bridge output voltages va and vb . The load is an R-L load with R = 10 and L = 10 mH . (a) For = 2 / 3 sketch vo and find its total harmonic dostortion THD . (b) For = 2 / 3 find approxi ...
Start of pump systems
... physical quantities which can be plotted as a function of time during the system start up. There are generally no problems when starting a centrifugal pump direct on-line. But it is always good engineering practice to make a start calculation. Axial flow (propeller-) pumps may however have starting ...
... physical quantities which can be plotted as a function of time during the system start up. There are generally no problems when starting a centrifugal pump direct on-line. But it is always good engineering practice to make a start calculation. Axial flow (propeller-) pumps may however have starting ...
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.