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EE6352_Unit_1
... • The commutator & brushes arrangement converts AC to DC It is of cylindrical structure and built up of wedge-shaped segments of high-conductivity hard-drawn or drop forged copper. • These segments are insulated from each other by thin layers of mica. •The number of segments is equal to the number o ...
... • The commutator & brushes arrangement converts AC to DC It is of cylindrical structure and built up of wedge-shaped segments of high-conductivity hard-drawn or drop forged copper. • These segments are insulated from each other by thin layers of mica. •The number of segments is equal to the number o ...
Circle Diagram for Three Phase Induction Motors
... 2. With suitable scale, draw phasor OA with length corresponding to I0 at an angle Φ0 from the vertical axis. Draw a horizontal line AB. 3. Draw OS equal to ISN at an angle ΦSC and join AS. 4. Draw the perpendicular bisector to AS to meet the horizontal line AB at C. 5. With C as centre, draw a semi ...
... 2. With suitable scale, draw phasor OA with length corresponding to I0 at an angle Φ0 from the vertical axis. Draw a horizontal line AB. 3. Draw OS equal to ISN at an angle ΦSC and join AS. 4. Draw the perpendicular bisector to AS to meet the horizontal line AB at C. 5. With C as centre, draw a semi ...
EX-503put - Corporate Group of Institutes
... the alternator is 375 rpm. Calculate: EMF induced per phase . The resultant flux in the air gap is 0.05Wb per pole . Assume the coil span as 150 electrical degree. Q.8 A 3-phase ,1500KVA, star –connected,50Hz, 2300V alternator has a resistance between each pair of terminals as measured by direct cur ...
... the alternator is 375 rpm. Calculate: EMF induced per phase . The resultant flux in the air gap is 0.05Wb per pole . Assume the coil span as 150 electrical degree. Q.8 A 3-phase ,1500KVA, star –connected,50Hz, 2300V alternator has a resistance between each pair of terminals as measured by direct cur ...
Chapter 4: Introduction to DC Machine
... voltages and current within them. • DC machines have DC outputs just because they have a mechanism converting AC voltages to DC voltages at their terminals. • This mechanism is called a commutator; therefore, DC machines are also called commutating machines. • DC generators are not as common as they ...
... voltages and current within them. • DC machines have DC outputs just because they have a mechanism converting AC voltages to DC voltages at their terminals. • This mechanism is called a commutator; therefore, DC machines are also called commutating machines. • DC generators are not as common as they ...
2 - WordPress.com
... The current changes in the solenoid depending on the sensor in the gas tank Preset for full or empty Electric motors- a device that changes electrical energy into mechanical energy (Figure 13) What ate some things in your house that use and electrical motor? Simple electric motor main parts are wire ...
... The current changes in the solenoid depending on the sensor in the gas tank Preset for full or empty Electric motors- a device that changes electrical energy into mechanical energy (Figure 13) What ate some things in your house that use and electrical motor? Simple electric motor main parts are wire ...
Lecture 7
... current is supplied by magnetic induction (transformer action) into the field windings of the rotor (a DC power source is not required) Although induction machines can be motors or generators they have many disadvantages as generators. Thus, they are referred to typically as induction motors. Most ...
... current is supplied by magnetic induction (transformer action) into the field windings of the rotor (a DC power source is not required) Although induction machines can be motors or generators they have many disadvantages as generators. Thus, they are referred to typically as induction motors. Most ...
10 - Electric Motors
... wire will produce a magnetic field across the loop. When this loop is surrounded by the field of another magnet, the loop will turn, producing a force (called torque) that results in mechanical motion. ...
... wire will produce a magnetic field across the loop. When this loop is surrounded by the field of another magnet, the loop will turn, producing a force (called torque) that results in mechanical motion. ...
Chapter 2 Polyphase induction motor File
... •In an induction motor the conventional 3-phase winding sets up the rotating magnetic field(RMF) and the rotor carries the current carrying conductors. •An EMF and hence current is induced in the rotor due to the speed difference between the RMF and the rotor, similar to that in a DC motor. •This cu ...
... •In an induction motor the conventional 3-phase winding sets up the rotating magnetic field(RMF) and the rotor carries the current carrying conductors. •An EMF and hence current is induced in the rotor due to the speed difference between the RMF and the rotor, similar to that in a DC motor. •This cu ...
Teknologi Elektrik
... The field circuit and armature circuit can be interconnected in various ways to provide a wide variety of performance characteristics-an out standing advantage of dc machines. The field poles can be excited by two field windings, a shunt filed winding and a series field winding. The shunt winding ha ...
... The field circuit and armature circuit can be interconnected in various ways to provide a wide variety of performance characteristics-an out standing advantage of dc machines. The field poles can be excited by two field windings, a shunt filed winding and a series field winding. The shunt winding ha ...
Commutator (electric)
![](https://commons.wikimedia.org/wiki/Special:FilePath/Universal_motor_commutator.jpg?width=300)
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.