ES 201(PE, CHE) - Haldia Institute of Technology
... on load operation, phasor diagram and equivalent circuit, losses of a transformer, open and short circuit tests, regulation and efficiency calculation. 3 phase induction motor: Types, Construction, production of rotating field, principle of operation, equivalent circuit and phasor diagram, rating, t ...
... on load operation, phasor diagram and equivalent circuit, losses of a transformer, open and short circuit tests, regulation and efficiency calculation. 3 phase induction motor: Types, Construction, production of rotating field, principle of operation, equivalent circuit and phasor diagram, rating, t ...
Optimal Efficiency Controller of AC Drive System
... three decades due to the increase in energy cost [1] & [2]. 2- Three-phase asynchronous motors, especially the squirrel cage type are widely used in industrial electric drives and are responsible for most of energy consumed by electric motors in industry [3]& [4]. Energy saving can be achieved by fo ...
... three decades due to the increase in energy cost [1] & [2]. 2- Three-phase asynchronous motors, especially the squirrel cage type are widely used in industrial electric drives and are responsible for most of energy consumed by electric motors in industry [3]& [4]. Energy saving can be achieved by fo ...
Theoretical developments
... Other methods based on inductance variation have been researched, but they all present some drawbacks in actual implementation This paper uses finite-element analysis to calculate the inductance of a BLDC motor and develops an initial rotor position detection and start-up algorithm, utilising th ...
... Other methods based on inductance variation have been researched, but they all present some drawbacks in actual implementation This paper uses finite-element analysis to calculate the inductance of a BLDC motor and develops an initial rotor position detection and start-up algorithm, utilising th ...
4/23 Induction Review
... Force on Current Loops Ch 21: Force/Torque arises from a battery operated loop in a static B-field. Ch 22: Current in loops “induced” by a “changing” external field. The loop then reacts as in Ch 21. In fact, battery operated loops resist the changing field caused by themselves! Called “Self Ind ...
... Force on Current Loops Ch 21: Force/Torque arises from a battery operated loop in a static B-field. Ch 22: Current in loops “induced” by a “changing” external field. The loop then reacts as in Ch 21. In fact, battery operated loops resist the changing field caused by themselves! Called “Self Ind ...
A Novel Universal Sensor Concept for Survivable PMSM Drives Yao
... Furthermore, additional hardware is usually required in the process of high-frequency signal injection and detection. Another type of position sensorless technique is based on an electric machine’s back electromotive force (EMF) [8], [9]. The position vector can be estimated by integration of the ba ...
... Furthermore, additional hardware is usually required in the process of high-frequency signal injection and detection. Another type of position sensorless technique is based on an electric machine’s back electromotive force (EMF) [8], [9]. The position vector can be estimated by integration of the ba ...
Sérgio CRUZ 1,2 , Flávio GASPAR 2
... When the inertia of the load is very high, the speed oscillations of the motor will be very small, and that ellipse will tend to a circumference. On the other hand, for extremely low values of the inertia, the ellipse tends to degenerate into a straight line oriented along the second quadrant of th ...
... When the inertia of the load is very high, the speed oscillations of the motor will be very small, and that ellipse will tend to a circumference. On the other hand, for extremely low values of the inertia, the ellipse tends to degenerate into a straight line oriented along the second quadrant of th ...
Performance Analysis of Double Inverter Fed Wound Rotor Induction
... efficiency even at a low-speed range. A SERD transfers power that is normally wasted in the rotor of an induction machine back to the ac mains supply to improve overall drive efficiency. The main draw-back of this scheme is the poor supply power factor due to reactive power drawn from the source bot ...
... efficiency even at a low-speed range. A SERD transfers power that is normally wasted in the rotor of an induction machine back to the ac mains supply to improve overall drive efficiency. The main draw-back of this scheme is the poor supply power factor due to reactive power drawn from the source bot ...
Rotating DC Motors Part I
... made clear below, it is necessary to change the direction of the DC current that is applied to the current-carrying conductor within the rotor. This is accomplished by utilizing a segmented metal ring, called a commutator. A commutator is directly connected to the current-carrying conductor, so it w ...
... made clear below, it is necessary to change the direction of the DC current that is applied to the current-carrying conductor within the rotor. This is accomplished by utilizing a segmented metal ring, called a commutator. A commutator is directly connected to the current-carrying conductor, so it w ...
International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.X, pp. XX-XX
... In the stationary reference frame, the rotor angle value is set to 0 and the value of δ is set to -θr. The reference frame affects the simulation speed, waveforms of all dq variables and in some certain cases the accuracy of the obtained results. The brief descriptions of the used SCIM block paramet ...
... In the stationary reference frame, the rotor angle value is set to 0 and the value of δ is set to -θr. The reference frame affects the simulation speed, waveforms of all dq variables and in some certain cases the accuracy of the obtained results. The brief descriptions of the used SCIM block paramet ...
Course Home - Haldia Institute of Technology
... DC Machines: Construction, Basic concepts of winding (Lap and wave). DC generator: Principle ofoperation, EMF equation, characteristics (open circuit, load) DC motors: Principle of operation, Speed - torque Characteristics (shunt and series machine), starting (by 3 point starter), speed control (ar ...
... DC Machines: Construction, Basic concepts of winding (Lap and wave). DC generator: Principle ofoperation, EMF equation, characteristics (open circuit, load) DC motors: Principle of operation, Speed - torque Characteristics (shunt and series machine), starting (by 3 point starter), speed control (ar ...
Essay 90-4cd DC motor
... 4. a) i) Draw a labeled diagram of a simple d.c. motor using permanent magnets. Indicate the direction of rotation of the motor and state the function of the commutator. ii) Describe and explain THREE modifications for improving the turning effect in practical d.c. motors. iii) The magnetic fields o ...
... 4. a) i) Draw a labeled diagram of a simple d.c. motor using permanent magnets. Indicate the direction of rotation of the motor and state the function of the commutator. ii) Describe and explain THREE modifications for improving the turning effect in practical d.c. motors. iii) The magnetic fields o ...
World`s Simplest Motor
... owner’s name.) Tools should include the following: several screwdrivers of different sizes, including straight and Philips head, small Allen key wrenches, wrenches and pliers of various sizes and types ...
... owner’s name.) Tools should include the following: several screwdrivers of different sizes, including straight and Philips head, small Allen key wrenches, wrenches and pliers of various sizes and types ...
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.