Chapter 17 - Northern Highlands
... must switch from north to south as each rotor magnet passes by to keep the rotor turning. The device that makes this happen is called a commutator. ...
... must switch from north to south as each rotor magnet passes by to keep the rotor turning. The device that makes this happen is called a commutator. ...
power devices and systems - McMaster University > ECE
... Performance prediction - efficiency, voltage regulation Calculations in SI units, per unit and percent Three phase connections - three phase per unit calculations ...
... Performance prediction - efficiency, voltage regulation Calculations in SI units, per unit and percent Three phase connections - three phase per unit calculations ...
17511 Sample Question Paper
... a) Describe the principle of operation and working of a three-phase induction motor. b) Draw power stages of three phase induction motor. Derive relation for rotor copper loss. c) Compare salient pole and smooth cylindrical pole type alternators on the basis of Speed, rotor axial length, rotor diame ...
... a) Describe the principle of operation and working of a three-phase induction motor. b) Draw power stages of three phase induction motor. Derive relation for rotor copper loss. c) Compare salient pole and smooth cylindrical pole type alternators on the basis of Speed, rotor axial length, rotor diame ...
INTRODUCTION. -
... amplitude. A variable frequency is required because the rotor speed depends on the speed of the rotating magnetic field provided by the stator. A variable voltage is required because the motor impedance reduces at low frequencies and consequently the current has to be limited by means of reducing th ...
... amplitude. A variable frequency is required because the rotor speed depends on the speed of the rotating magnetic field provided by the stator. A variable voltage is required because the motor impedance reduces at low frequencies and consequently the current has to be limited by means of reducing th ...
Equivalent Circuit Model
... The three-phase winding are displaced from each other by 120 electrical degrees in space Current flows in a phase coil produce a sinusoidally distributed mmf wave centered on the axis of the coil. Alternating current in each coil produces a pulsating mmf wave. Mmf waves are displaced by 120 degrees ...
... The three-phase winding are displaced from each other by 120 electrical degrees in space Current flows in a phase coil produce a sinusoidally distributed mmf wave centered on the axis of the coil. Alternating current in each coil produces a pulsating mmf wave. Mmf waves are displaced by 120 degrees ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,
... Matlab/Simulink is a systems simulator furnished by The MathWorks, Inc. For simulation of electrical circuits, power system block sets are used which incorporates libraries of electrical blocks and analysis tools which are used to convert electrical circuits into Simulink diagrams. The electrical bl ...
... Matlab/Simulink is a systems simulator furnished by The MathWorks, Inc. For simulation of electrical circuits, power system block sets are used which incorporates libraries of electrical blocks and analysis tools which are used to convert electrical circuits into Simulink diagrams. The electrical bl ...
Presentation by Yongguo
... • Not consider PDA here • Concentrated on the speed control of motors to save energy ...
... • Not consider PDA here • Concentrated on the speed control of motors to save energy ...
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.