Encyclopedia Knowledge

Armature Reaction Definition Armature reaction in an alternator is defined as the effect of the armature’s magnetic field on the main magnetic field of the alternator or synchronous generator. Magnetic Field Interaction When the armature carries current, its magnetic field interacts with the main fi

Dc generator definition A DC generator is defined as an electrical device that converts mechanical energy into direct current (DC) electricity. It works according to the principle of electromagnetic induction, when a conductor passes through a magnetic field, it creates a potential difference in the

Winding factor definition The winding factor is defined as the product of the pitch factor and the distribution factor. Pitch factor The pitch factor is the phasor of the induced electromotive force and its ratio to its arithmetic sum, and is always less than the unit. This pitch factor is the funda

What is the Hopkinson Test? The Hopkinson test definition The Hopkinson test is a useful method to test the efficiency of DC motors. It requires two identical machines, one acting as a generator and the other as a motor. The generator provides mechanical power to the motor, which then drives the gen

Synchronous Motor Excitation Prior to understanding this synchronous motor excitation, it should be remembered that any electromagnetic device must draw a magnetizing current from the AC source to produce the required working flux. This magnetizing current lags by almost 90o to the supply voltage. I

What is the Parallel Operation of DC Generators? Parallel operation definition of DC generator In modern power systems, power is usually provided by many parallel synchronous generators to ensure continuous operation of the plant. The use of single large generators is now obsolete. Having two genera

Hunting in Synchronous Motor Key learnings: Hunting Defined : Hunting in a synchronous motor is the phenomenon where the rotor oscillates around a new equilibrium position due to sudden changes in load. Causes of Hunting : Hunting can be caused by abrupt load changes, sudden field current adjustment

What is the EMF Equation of DC Generator? EMF definitio n Electromotive force (EMF) in a DC generator is defined as the voltage generated by the movement of a conductor through a magnetic field. Faraday's law This law explains that the induced electromotive force in a generator conductor is proporti

What are Self Excited DC Generators? Self-excited DC generator A modern DC generator with an exciting coil is a self-excited generator, which starts with the initial current in the exciting coil. When the generator is turned off, a small magnetic force is generated in the rotor iron, which induces a

Performance Curves Definition Performance curves of a DC generator are graphs that show how the output voltage changes as the load current varies from no load to full load. These are also known as characteristic curves. These curves help us understand the voltage regulation of different types of DC

How dose a DC Generator Work? DC Generator Definition A DC generator is a device that converts mechanical power into direct electrical power using the principle of electromagnetic induction. Faraday’s Law This law states that when a conductor moves in a magnetic field it cuts magnetic lines of force

Pole Pitch Definition Pole pitch is defined as the peripheral distance between the center of two adjacent poles in a DC machine. This distance is measured in terms of armature slots or armature conductors that come between two adjacent pole centers. Pole Pitch is equal to the total number of armatur