Electricity generators
... the generator is connected. DC generators are usually operated at fairly low voltages to avoid the sparking between brushes and commutator that occurs at high voltage. The highest potential commonly developed by such generators is 1500 V. In some newer machines this reversal is accomplished using po ...
... the generator is connected. DC generators are usually operated at fairly low voltages to avoid the sparking between brushes and commutator that occurs at high voltage. The highest potential commonly developed by such generators is 1500 V. In some newer machines this reversal is accomplished using po ...
Electricity and Magnetism
... 1. Wrapping the wire in a coil. The greater the number of turns in the coil, the greater the increase in strength. 2. Adding a core. Iron vs. Al??? 3. Increasing the current in the coil will strengthen the ...
... 1. Wrapping the wire in a coil. The greater the number of turns in the coil, the greater the increase in strength. 2. Adding a core. Iron vs. Al??? 3. Increasing the current in the coil will strengthen the ...
Generator and Transformer
... How does electric energy transmit over large distances? How much power is wasted when 10000W of power is transmitted along a cable with a resistance of 1 at 200V? What would be lost if transmitted at 2000V instead? Much less lost when travels at a higher V and lower I ...
... How does electric energy transmit over large distances? How much power is wasted when 10000W of power is transmitted along a cable with a resistance of 1 at 200V? What would be lost if transmitted at 2000V instead? Much less lost when travels at a higher V and lower I ...
Chapter 7: DC Machine Fundamentals
... placed in slots 7 and 12. The other end of coil is connected to commutator bar 13. The second coil starts at this commutator bar and is placed in slots 18 and 2 and ends on commutator bar 3. This winding is called a wave winding because the coils are laid down a wave pattern. ...
... placed in slots 7 and 12. The other end of coil is connected to commutator bar 13. The second coil starts at this commutator bar and is placed in slots 18 and 2 and ends on commutator bar 3. This winding is called a wave winding because the coils are laid down a wave pattern. ...
COMBINED FIRST AND SECOND SEMESTER B.TECH
... Armature The armature is where the moving conductors are located. The armature is constructed by stacking laminated sheets of silicon steel. Thickness of these lamination is kept low to reduce eddy current losses. Field windings In the case of wound field machines (as against permanent magnet excit ...
... Armature The armature is where the moving conductors are located. The armature is constructed by stacking laminated sheets of silicon steel. Thickness of these lamination is kept low to reduce eddy current losses. Field windings In the case of wound field machines (as against permanent magnet excit ...
DC Motor, How It Works
... steel laminations. (Because the field windings carry direct current, it is not electrically necessary to have the cores laminated.) !t is, however, necessary for the pole faces to be laminated, because of their proximity to the armature windings. The armature core, which carries the armature winding ...
... steel laminations. (Because the field windings carry direct current, it is not electrically necessary to have the cores laminated.) !t is, however, necessary for the pole faces to be laminated, because of their proximity to the armature windings. The armature core, which carries the armature winding ...
March
... (B) A relay is series connected and a contactor is parallel connected. (C) Contactors can handle heavier loads than relays. (D) Contactors are made from silver and relays a remade from copper. Briefly Justify your Answer 5. The most common source of excitation for synchronous motors is a/an ________ ...
... (B) A relay is series connected and a contactor is parallel connected. (C) Contactors can handle heavier loads than relays. (D) Contactors are made from silver and relays a remade from copper. Briefly Justify your Answer 5. The most common source of excitation for synchronous motors is a/an ________ ...
Presentation – DC motor
... The part of the motor that rotates Receives the electrical energy Made up of :- ...
... The part of the motor that rotates Receives the electrical energy Made up of :- ...
Direct Current Motor Electrical Evaluation Using Motor Circuit Analysis
... Electrical testing of Direct Current (DC) electric motors is a challenge within industry, manufacturing and repair centers alike. The key issue has to do with the ability to compare one coil to the next, should exact information not be provided. In this article, the issue of simple tests to increase ...
... Electrical testing of Direct Current (DC) electric motors is a challenge within industry, manufacturing and repair centers alike. The key issue has to do with the ability to compare one coil to the next, should exact information not be provided. In this article, the issue of simple tests to increase ...
BEX – Basic Electricity
... Consists of heavy loops of insulated copper wire Wraps around (and insulated from) a laminated iron core ...
... Consists of heavy loops of insulated copper wire Wraps around (and insulated from) a laminated iron core ...
Prof: URVISH MEVADA
... •The stator winding excited by ac current. The current produces a rotating magnetic field which in turn produces currents in rotor conductors due to induction. •These machines mostly used as motors. •Rotor windings are short circuited (electrically) and frequently have no external connections. •Stat ...
... •The stator winding excited by ac current. The current produces a rotating magnetic field which in turn produces currents in rotor conductors due to induction. •These machines mostly used as motors. •Rotor windings are short circuited (electrically) and frequently have no external connections. •Stat ...
ac synchronous generators
... the rotor is spinning. How can we supply DC current to something that is moving?” The simplest solution to this dilemma is to use slip rings and brushes as illustrated in Figure 5.5. Note that the end connections of the field winding are tied to two copper rings mounted on the rotor shaft. Stationar ...
... the rotor is spinning. How can we supply DC current to something that is moving?” The simplest solution to this dilemma is to use slip rings and brushes as illustrated in Figure 5.5. Note that the end connections of the field winding are tied to two copper rings mounted on the rotor shaft. Stationar ...
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.