View/Download-PDF - International Journal of Computer Science
... control. But the disadvantage is that wear and tear mechanism of the brush and the bulky construction. To overcome these disadvantages and The economic constraints and new standards legislated by governments place increasingly stringent requirements on electrical systems. New generations of equipmen ...
... control. But the disadvantage is that wear and tear mechanism of the brush and the bulky construction. To overcome these disadvantages and The economic constraints and new standards legislated by governments place increasingly stringent requirements on electrical systems. New generations of equipmen ...
EET-222-ELECTRICAL MC-II
... • The stator is the stationary electrical part of the motor. • The stator core of a National Electrical Manufacturers Association (NEMA) motor is made up of several hundred thin laminations. • Stator laminations are stacked together forming a hollow cylinder. Coils of insulated wire are inserted int ...
... • The stator is the stationary electrical part of the motor. • The stator core of a National Electrical Manufacturers Association (NEMA) motor is made up of several hundred thin laminations. • Stator laminations are stacked together forming a hollow cylinder. Coils of insulated wire are inserted int ...
Unit 3
... An induction motor (IM) is a type of asynchronous AC motor where power is supplied to the rotating device by means of electromagnetic induction. The induction motor with a wrapped rotor was invented by Nikola Tesla Nikola Tesla in 1882 in France but the initial patent was issued in 1888 after Tesla ...
... An induction motor (IM) is a type of asynchronous AC motor where power is supplied to the rotating device by means of electromagnetic induction. The induction motor with a wrapped rotor was invented by Nikola Tesla Nikola Tesla in 1882 in France but the initial patent was issued in 1888 after Tesla ...
Generator Building Competition - The School District of Palm Beach
... apart so that currents are in phase. To best utilize a 4 pole generator there should be a coil across each pair of poles. The coils can be tested individually. ...
... apart so that currents are in phase. To best utilize a 4 pole generator there should be a coil across each pair of poles. The coils can be tested individually. ...
Speed control of wound rotor induction motors by AC regulator
... reduction does not provide any improvement in efficiency. However, it gives a sufficiently large torque range as no load current varies from 25% to 40% of full load current. V. CONCLUSION ...
... reduction does not provide any improvement in efficiency. However, it gives a sufficiently large torque range as no load current varies from 25% to 40% of full load current. V. CONCLUSION ...
Methods of excitation Separately Excited DC Generator These are
... (say) Then, voltage across the load, V = IRa Power generated, Pg = Eg×I Power delivered to the external load, PL = V×I. Self-excited DC Generators These are the generators whose field magnets are energized by the current supplied by themselves. In these type of machines field coils are internally co ...
... (say) Then, voltage across the load, V = IRa Power generated, Pg = Eg×I Power delivered to the external load, PL = V×I. Self-excited DC Generators These are the generators whose field magnets are energized by the current supplied by themselves. In these type of machines field coils are internally co ...
Unit – 7
... Induction motors can be brought rapidly to a stop (and / or reversed) by reversing one pair of leads which has the effect of reversing the rotating wave. This is known as "plugging". The motor can also be stopped quickly by cutting the AC supply and feeding the stator windings instead with a DC (zer ...
... Induction motors can be brought rapidly to a stop (and / or reversed) by reversing one pair of leads which has the effect of reversing the rotating wave. This is known as "plugging". The motor can also be stopped quickly by cutting the AC supply and feeding the stator windings instead with a DC (zer ...
Vibration Motor
... Nowadays, electric motors are commonly used in people’s daily life. Imagine that, in an apartment, a man is watching a movie played by his laptop. At that moment, a motor in his computer runs a CPU fan to draw cooler air into the case from the outside, and some motors runs the cd driver so the infor ...
... Nowadays, electric motors are commonly used in people’s daily life. Imagine that, in an apartment, a man is watching a movie played by his laptop. At that moment, a motor in his computer runs a CPU fan to draw cooler air into the case from the outside, and some motors runs the cd driver so the infor ...
Alternating Current Motors
... mechanical power but are increasingly being used in variable speed-control applications. • Advantages: They are popular because they can provide rotary power with high efficiency, low maintenance, and exceptional reliability—all at relatively low cost. • These desirable qualities are the result of t ...
... mechanical power but are increasingly being used in variable speed-control applications. • Advantages: They are popular because they can provide rotary power with high efficiency, low maintenance, and exceptional reliability—all at relatively low cost. • These desirable qualities are the result of t ...
DC Generator
... combination makes a sliding switch that energizes particular portions of the armature, based on the position of the rotor. This process creates north and south magnetic poles on the rotor that are attracted to or repelled by north and south poles on the stator, which are formed by passing direct cur ...
... combination makes a sliding switch that energizes particular portions of the armature, based on the position of the rotor. This process creates north and south magnetic poles on the rotor that are attracted to or repelled by north and south poles on the stator, which are formed by passing direct cur ...
TERMINAL CHARACTERISTIC of a SHUNT DC MOTOR
... voltage drop and combining Radj with the field resistance shown in (b) Some of the few variations and simplifications: 1- brush drop voltage is often only a very tiny fraction of generated voltage in the machine. where it is not too critical, brush drop voltage may be left out or included in the RA. ...
... voltage drop and combining Radj with the field resistance shown in (b) Some of the few variations and simplifications: 1- brush drop voltage is often only a very tiny fraction of generated voltage in the machine. where it is not too critical, brush drop voltage may be left out or included in the RA. ...
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.