pravin ladda
... METHODS OF IMPROVING COMMUTATION To make the commutation satisfactory we have to make sure that the current flowing through the coil completely reversed during the commutation period attains its full value. There are two practical ways of improving commutation i.e. of making current reversal in ...
... METHODS OF IMPROVING COMMUTATION To make the commutation satisfactory we have to make sure that the current flowing through the coil completely reversed during the commutation period attains its full value. There are two practical ways of improving commutation i.e. of making current reversal in ...
DC Machines
... • The magnetic field produced by the stator poles induces a voltage in the rotor (or armature) coils when the generator is rotated. • This induced voltage is represented by a voltage source. • The stator coil has resistance, which is connected in series. • The pole flux is produced by the DC excitat ...
... • The magnetic field produced by the stator poles induces a voltage in the rotor (or armature) coils when the generator is rotated. • This induced voltage is represented by a voltage source. • The stator coil has resistance, which is connected in series. • The pole flux is produced by the DC excitat ...
How Electric Motors are made Three phase AC induction motor
... interaction, the machine will operate as a motor. On the other hand, the motor may be driven by an external agency beyond a speed such that the machine begins to deliver electric power; it then operates as an induction generator. Almost invariably, induction machines are used as motors. ...
... interaction, the machine will operate as a motor. On the other hand, the motor may be driven by an external agency beyond a speed such that the machine begins to deliver electric power; it then operates as an induction generator. Almost invariably, induction machines are used as motors. ...
PPT - Mr.E Science
... b. which in turn spins the loop/armature which will induce a current. c. Attached to each end of the coil loop are Slip Rings – which spin & d. transfers the electricity to the brushes & the rest of the circuit ...
... b. which in turn spins the loop/armature which will induce a current. c. Attached to each end of the coil loop are Slip Rings – which spin & d. transfers the electricity to the brushes & the rest of the circuit ...
AC Motor Speed Control and Other Motors
... voltage (rectified AC) rapidly switched to match "area under curve" ...
... voltage (rectified AC) rapidly switched to match "area under curve" ...
ES205 Lab 4 - Modeling of a Motor-Generator Set - Rose
... where both machines are armature-controlled. Nominal system parameters are given . You will use this model for the lab. Introduction: Electric motors and generators are both machines which are used to convert one type of energy into another usable form. In most commercial electric motors and generat ...
... where both machines are armature-controlled. Nominal system parameters are given . You will use this model for the lab. Introduction: Electric motors and generators are both machines which are used to convert one type of energy into another usable form. In most commercial electric motors and generat ...
Electric motors Electric motors are everywhere! In your house
... become a magnet and have a north and south pole while the battery is connected. Now say that you take your nail electromagnet, run an axle through the middle of it and suspend it in the middle of a horseshoe magnet as shown in the figure below. If you were to attach a battery to the electromagnet so ...
... become a magnet and have a north and south pole while the battery is connected. Now say that you take your nail electromagnet, run an axle through the middle of it and suspend it in the middle of a horseshoe magnet as shown in the figure below. If you were to attach a battery to the electromagnet so ...
Introduction to DC Electric Motors
... line up with the opposite magnetic poles on the stator. (Opposites ATTRACT). • Once opposite poles align, the movement of the motor would stop. • However, to ensure continuous movement of the motor, the poles of the armature field are electronically reversed as it reaches this point, so it keeps tur ...
... line up with the opposite magnetic poles on the stator. (Opposites ATTRACT). • Once opposite poles align, the movement of the motor would stop. • However, to ensure continuous movement of the motor, the poles of the armature field are electronically reversed as it reaches this point, so it keeps tur ...
AC Generators I
... generator to include rotor, stator, armature. field windings, slip rings and brushes. • Understand the effects of applying a DC voltage power supply to a two pole rotor's field windings via brushes and slip rings. • Understand the induced effects that result from rotating the rotor's electromagnetic ...
... generator to include rotor, stator, armature. field windings, slip rings and brushes. • Understand the effects of applying a DC voltage power supply to a two pole rotor's field windings via brushes and slip rings. • Understand the induced effects that result from rotating the rotor's electromagnetic ...
Faraday`s Law - Rutgers Physics
... give rise to an electrical current, a phenomenon we call electromagnetic induction. The mathematical law that relates the changing magnetic field to the induced current (or, more accurately, the induced voltage or emf) is called Faraday's Law, named after the man (among others) who first observed it ...
... give rise to an electrical current, a phenomenon we call electromagnetic induction. The mathematical law that relates the changing magnetic field to the induced current (or, more accurately, the induced voltage or emf) is called Faraday's Law, named after the man (among others) who first observed it ...
Synchronous Motors
... – Stator identical to that of a three-phase induction motor – now called the “armature” – Energize from a three-phase supply and develop the rotating magnetic field ...
... – Stator identical to that of a three-phase induction motor – now called the “armature” – Energize from a three-phase supply and develop the rotating magnetic field ...
Physics 12 - hrsbstaff.ednet.ns.ca
... An electric motor converts electrical energy into mechanical energy. A generator converts mechanical energy into electrical energy. Both use the principles of electromagnetism. 2. Where does the kinetic energy come from in the following types of generators? a. Gas generators Combustion of the gas b. ...
... An electric motor converts electrical energy into mechanical energy. A generator converts mechanical energy into electrical energy. Both use the principles of electromagnetism. 2. Where does the kinetic energy come from in the following types of generators? a. Gas generators Combustion of the gas b. ...
95MET-4
... 7. A battery of 40 cells in series delivers a constant discharging current of 4A for 40 hours, the average p.d. per cell being 1.93V during the process. The battery is then completely recharged by a current of 8A flowing for 24 hours, the average p.d.per cell being 2.2V. Calculate the ampere hour a ...
... 7. A battery of 40 cells in series delivers a constant discharging current of 4A for 40 hours, the average p.d. per cell being 1.93V during the process. The battery is then completely recharged by a current of 8A flowing for 24 hours, the average p.d.per cell being 2.2V. Calculate the ampere hour a ...
The creation of a rotating stator field using three-phase power
... The creation of a rotating stator field using three-phase power is similar to the principle of the splitphase or two phase (capacitor run) system. In the three-phase system, a rotating magnetic field is generated in three-phases instead of two. When the stator of a three-phase motor is connected to ...
... The creation of a rotating stator field using three-phase power is similar to the principle of the splitphase or two phase (capacitor run) system. In the three-phase system, a rotating magnetic field is generated in three-phases instead of two. When the stator of a three-phase motor is connected to ...
Two ways of looking at a transformer
... current every half-revolution to ensure that the torque exerted on the armature continues to act in the forward direction. The sparking from the reversal of the current as well as the sliding contact causes wear of the brushes and commutator, which is a significant drawback of d.c. motors. The field ...
... current every half-revolution to ensure that the torque exerted on the armature continues to act in the forward direction. The sparking from the reversal of the current as well as the sliding contact causes wear of the brushes and commutator, which is a significant drawback of d.c. motors. The field ...
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.