Using E-Motor Emulators for Close-To
... emulated, for example, synchronous or asynchronous motors. These motor models can be changed by software, so that one single emulator can be used to represent different motor types. The phase emulation permits a smooth transition of bi-directional power flow that represents both operating modes “mot ...
... emulated, for example, synchronous or asynchronous motors. These motor models can be changed by software, so that one single emulator can be used to represent different motor types. The phase emulation permits a smooth transition of bi-directional power flow that represents both operating modes “mot ...
Moving Conductor in a Magnetic Field
... The need for a starting resistance in a motor • When the motor is first switched on, =0. • The initial current, Io=V/R, very large if R is small. • When the motor is running, the back emf increases, so the current decrease to its working value. • To prevent the armature burning out under a high s ...
... The need for a starting resistance in a motor • When the motor is first switched on, =0. • The initial current, Io=V/R, very large if R is small. • When the motor is running, the back emf increases, so the current decrease to its working value. • To prevent the armature burning out under a high s ...
Making Motors Dance Our Tune
... Just One Little Problem • As the armature coil rotates through the magnetic field the current direction alternates as different ends of the loop line up with the fixed poles • I didn’t want an AC generator ...
... Just One Little Problem • As the armature coil rotates through the magnetic field the current direction alternates as different ends of the loop line up with the fixed poles • I didn’t want an AC generator ...
DESIGN AND SIMULATION BY USING SMART POWER MODULE
... power. They are commutated series-wound motors or shunt-wound motors where the stator's field coils are connected in series or parallel with the rotor windings through a commutator. This type of electric motor can operate well on AC because the current in both the field coils and the armature (and t ...
... power. They are commutated series-wound motors or shunt-wound motors where the stator's field coils are connected in series or parallel with the rotor windings through a commutator. This type of electric motor can operate well on AC because the current in both the field coils and the armature (and t ...
MEASURING INSTRUMENTS
... a moving-iron instrument is given below: • Moving element: a small piece of soft iron in the form of a vane or rod. • Coil: to produce the magnetic field due to current flowing through it and also to magnetize the iron pieces. • In repulsion type, a fixed vane or rod is also used and magnetized with ...
... a moving-iron instrument is given below: • Moving element: a small piece of soft iron in the form of a vane or rod. • Coil: to produce the magnetic field due to current flowing through it and also to magnetize the iron pieces. • In repulsion type, a fixed vane or rod is also used and magnetized with ...
2012S
... of transformers. Discuss their advantages and disadvantages. b) Two single phase furnaces working at 110 V are connected to a 3.3 kV, 3-phase supply through Scott connected transformers. Determine the currents in 3-phase lines when the power taken by each furnace 500 kW at a power factor of 0.8 lagg ...
... of transformers. Discuss their advantages and disadvantages. b) Two single phase furnaces working at 110 V are connected to a 3.3 kV, 3-phase supply through Scott connected transformers. Determine the currents in 3-phase lines when the power taken by each furnace 500 kW at a power factor of 0.8 lagg ...
International Electrical Engineering Journal (IEEJ) Vol. 5 (2014) No.9, pp. 1545-1552
... Abstract— In industries, the three phase squirrel cage induction motor is widely used due to its simple construction, robust design and low operational costs. The exploitation of squirrel cage induction motor with power semiconductor devices based inverters presents the greater advantages on cost an ...
... Abstract— In industries, the three phase squirrel cage induction motor is widely used due to its simple construction, robust design and low operational costs. The exploitation of squirrel cage induction motor with power semiconductor devices based inverters presents the greater advantages on cost an ...
Sizing a Generator for a Specific Electric Motor Load, or
... Sizing a Generator for a Specific Electric Motor Load, or for use with Large Extension Cords Generator sizing becomes more difficult when electric motors are involved, due to their large starting demand. Typically, there are two motor styles: CODE G requires 3 times running watts to start, and CODE ...
... Sizing a Generator for a Specific Electric Motor Load, or for use with Large Extension Cords Generator sizing becomes more difficult when electric motors are involved, due to their large starting demand. Typically, there are two motor styles: CODE G requires 3 times running watts to start, and CODE ...
Review on Fault Diagnosis in Three-Phase
... Presence of foreign particles could cause various ill effects on the function of motor like premature bearing failure, breakdown of insulation system caused due to reduction in heat dissipation. So steps should be taken to prevent the foreign particles from interacting with motor surface. To summari ...
... Presence of foreign particles could cause various ill effects on the function of motor like premature bearing failure, breakdown of insulation system caused due to reduction in heat dissipation. So steps should be taken to prevent the foreign particles from interacting with motor surface. To summari ...
10 Application Information
... rated HP at rated load and voltage. With AC systems, it is commonly the point where 60 Hz is applied to the induction motor. Breakaway Torque – The torque required to start a machine from standstill. Breakdown Torque (BDT) – The maximum torque that an AC motor will develop with rated voltage applied ...
... rated HP at rated load and voltage. With AC systems, it is commonly the point where 60 Hz is applied to the induction motor. Breakaway Torque – The torque required to start a machine from standstill. Breakdown Torque (BDT) – The maximum torque that an AC motor will develop with rated voltage applied ...
unit 3 ac machines
... transformer as the side that usually takes power, and the “secondary” as the side that usually delivers power. In a single-phase voltage transformer the primary is usually the side with the higher voltage. These two coils are not in electrical contact with each other but are instead wrapped together ...
... transformer as the side that usually takes power, and the “secondary” as the side that usually delivers power. In a single-phase voltage transformer the primary is usually the side with the higher voltage. These two coils are not in electrical contact with each other but are instead wrapped together ...
iii. design and construction of afpmsg
... Axial-flux permanent magnet (AFPM) machines have become an important subject of study because of the development of neodymium magnets over the past 20 years. These machines offer many unique features. They are usually more efficient because of the fact that field excitation losses are eliminated res ...
... Axial-flux permanent magnet (AFPM) machines have become an important subject of study because of the development of neodymium magnets over the past 20 years. These machines offer many unique features. They are usually more efficient because of the fact that field excitation losses are eliminated res ...
the control of switched reluctance drives
... Although relatively little has been reported on the design of the switched reluctance generator controller, there is a broad variety in the proposed controller schemes [1]. At lower speeds, the current pulses are controlled by chopping the voltage between zero and -UDC,, or between +UDC and -UDC wit ...
... Although relatively little has been reported on the design of the switched reluctance generator controller, there is a broad variety in the proposed controller schemes [1]. At lower speeds, the current pulses are controlled by chopping the voltage between zero and -UDC,, or between +UDC and -UDC wit ...
Laboratory Manual
... If normal supply voltage is applied to stationary motor then the motor takes very large initial current. Induction Motor when direct switched takes 5 to 7 times their full load current & develops only 1.5 to 2.5 times their full load torque. This will produce large line drop affect the operation of ...
... If normal supply voltage is applied to stationary motor then the motor takes very large initial current. Induction Motor when direct switched takes 5 to 7 times their full load current & develops only 1.5 to 2.5 times their full load torque. This will produce large line drop affect the operation of ...
Keywords: simulation, short
... proved beneficial also when describing the properties of systems and its components in the teaching process. The merits of this method are particularly significant in cases when it is necessary to simulate the behaviour of objects in various boundary modes of operation which cannot be induced during ...
... proved beneficial also when describing the properties of systems and its components in the teaching process. The merits of this method are particularly significant in cases when it is necessary to simulate the behaviour of objects in various boundary modes of operation which cannot be induced during ...
Commutator (electric)
A commutator is the moving part of a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. The commutator is one component of a motor; there are also two or more stationary electrical contacts called ""brushes"" made of a soft conductor like carbon press against the commutator, making sliding contact with successive segments of the commutator as it rotates. The windings (coils of wire) on the armature are connected to the commutator segments. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced. In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to unidirectional direct current in the external load circuit. The first direct current commutator-type machine, the dynamo, was built by Hippolyte Pixii in 1832, based on a suggestion by André-Marie Ampère. Commutators are relatively inefficient, and also require periodic maintenance such as brush replacement. Therefore, commutated machines are declining in use, being replaced by alternating current (AC) machines, and in recent years by brushless DC motors which use semiconductor switches.