2. TYPES AND SHAPES OF WINDING WIRES: The winding wires
... slots according to the design requirements and hence the slots and conductor combination will not produce a mechanically balanced winding. Under such conditions some coils are placed in the slots, not connected to the remaining part of the winding but only for mechanical balance. Such windings are c ...
... slots according to the design requirements and hence the slots and conductor combination will not produce a mechanically balanced winding. Under such conditions some coils are placed in the slots, not connected to the remaining part of the winding but only for mechanical balance. Such windings are c ...
Induction Motors
... non-polar electrolytic capacitor which could be two + to + (or - to -) series connected polarized electrolytic capacitors. Such AC rated electrolytic capacitors have such high losses that they can only be used for intermittent duty (1 second on, 60 seconds off) like motor starting. A capacitor for m ...
... non-polar electrolytic capacitor which could be two + to + (or - to -) series connected polarized electrolytic capacitors. Such AC rated electrolytic capacitors have such high losses that they can only be used for intermittent duty (1 second on, 60 seconds off) like motor starting. A capacitor for m ...
File
... At the next stage (d) the main contact M has moved to tap B, so that it is once again carrying the load current, but now from the new tap. P however is still on tap A, so that the current from the shorted turns is limited by the upper half of the resistance. Finally the moving member is at posit ...
... At the next stage (d) the main contact M has moved to tap B, so that it is once again carrying the load current, but now from the new tap. P however is still on tap A, so that the current from the shorted turns is limited by the upper half of the resistance. Finally the moving member is at posit ...
(3) and
... When dealing with small motors, transients settle quickly, and therefore, provided that the system is well behaved, it is usually the steady-state response that is important. Let the steady-state change in speed with change in load be ...
... When dealing with small motors, transients settle quickly, and therefore, provided that the system is well behaved, it is usually the steady-state response that is important. Let the steady-state change in speed with change in load be ...
Understanding The Difference Between Three
... In a single-phase generator, the stator has a number of windings connected in series to form a single circuit across which the output voltage is generated. Equal voltage across all stator windings in phase with each other For instance, in a 4-pole generator, the four poles of the rotor are evenly sp ...
... In a single-phase generator, the stator has a number of windings connected in series to form a single circuit across which the output voltage is generated. Equal voltage across all stator windings in phase with each other For instance, in a 4-pole generator, the four poles of the rotor are evenly sp ...
Electrical Signature Analysis Part 1
... A motor uses the magnetic properties of attraction and repulsion to turn a shaft. In this simple diagram, wound coils around the stators create polarity. As the current changes direction, polarity changes, causing the rotor to be continually attracted and repulsed as it moves. Changes to impedance, ...
... A motor uses the magnetic properties of attraction and repulsion to turn a shaft. In this simple diagram, wound coils around the stators create polarity. As the current changes direction, polarity changes, causing the rotor to be continually attracted and repulsed as it moves. Changes to impedance, ...
EE2251-Electrical Machines I
... Single excited system-reluctance motor, single phase transformer, relay coil Multiply excited system-alternator, electro mechanical transducer 5. Why do all practical energy conversion devices make use of the magnetic field as a coupling medium rather than electric field? When compared to electric f ...
... Single excited system-reluctance motor, single phase transformer, relay coil Multiply excited system-alternator, electro mechanical transducer 5. Why do all practical energy conversion devices make use of the magnetic field as a coupling medium rather than electric field? When compared to electric f ...
Electric Motor
... the electromagnet switches just as the permanent magnet passes by, the force acting on the rotor will always cause it to rotate in the same direction. The key to making an electric motor is to switch the polarity of one or more electromagnets to alternately push and pull the magnets in the rotor. In ...
... the electromagnet switches just as the permanent magnet passes by, the force acting on the rotor will always cause it to rotate in the same direction. The key to making an electric motor is to switch the polarity of one or more electromagnets to alternately push and pull the magnets in the rotor. In ...
Unit -5 - WordPress.com
... These Rotors have small diameter and large axial length. The main advantage of cylindrical rotor is, it is mechanically strong and preferred for high speed applications. It is used for steam driven turbo Alternator which run at very high speeds of 3600 rpm. ...
... These Rotors have small diameter and large axial length. The main advantage of cylindrical rotor is, it is mechanically strong and preferred for high speed applications. It is used for steam driven turbo Alternator which run at very high speeds of 3600 rpm. ...
High Power Density Marine Propulsion Motors with Double
... Iron pole pieces (that essentially limit the air gap flux to about 1.5 T) are not used and therefore such a machine is less massive and smaller in diameter. The rotor excitation fields can be raised to 4 T or even higher with superconducting coils and thus achieve a high power density. Machines with ...
... Iron pole pieces (that essentially limit the air gap flux to about 1.5 T) are not used and therefore such a machine is less massive and smaller in diameter. The rotor excitation fields can be raised to 4 T or even higher with superconducting coils and thus achieve a high power density. Machines with ...
DC Generator - Schuylkill Technology Center
... 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 power electronic devices, for exa ...
... 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 power electronic devices, for exa ...
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.