Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Pole Pitch DefinitionPole 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 armature slots divided by the total number of poles in the machine.For example, if there are 96 slots on the armature periphery and 4 poles, the number of armature slots that come between two adjacent pole cen

Armature Reaction DefinitionArmature 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 InteractionWhen the armature carries current, its magnetic field interacts with the main field, causing either distortion (cross-magnetizing) or reduction (demagnetizing) of the main field flux.Power Factor InfluenceAt unity power factor, the angle between armature current I and induced emf E,

Armature winding definitionThe armature winding in an alternator is the arrangement of coils to generate electricity and is essential to its operation.Type of armature windingSingle-phase armature windingSingle-phase armature windings can be centralized or distributed.Centralized armature windingWhen the number of slots on the armature equals the number of poles in the machine, the central winding is used. This winding type provides maximum output voltage, but is not always fully sinusoidal. The

What is Armature Reaction in DC Machine?Armature reaction definitionThe armature reaction in a DC motor is the effect of the armature magnetic flux on the main magnetic field, changing its distribution and intensity.Cross magnetizationCross-magnetization due to the armature current affects the magnetic field by moving the magnetic neutral axis, resulting in efficiency problems.Brush ShiftA natural solution to the problem appears to shift the brushes along the direction of rotation in generator a

What is an Armature ?Armature DefinitionAn armature is the component of electric machines that carries alternating current and interacts with a magnetic field, essential for both motors and generators.Motor FunctionIn motors, the armature converts electrical energy into mechanical energy, utilizing electromagnetic induction and rotational motion.Generator FunctionIn generators, the armature transforms mechanical energy into electrical energy, driven by the motion within a magnetic field.Key Part

Power rating of an alternator is defined as the power which can be delivered by an alternator safely and efficiently under some specific conditions. Increasing load increases losses in the alternator, which leads to a temperature rise of the machine. The conductor and insulator parts of the machine have some specific overheating withstand limits. The manufacturer so specifies the power rating of an alternator that at that maximum load the temperature rise of different parts of the machine does n

Armature winding in an alternator may be either closed type open type. Closed winding forms star connection in armature winding of alternator.There are some common properties of armature winding. First and most important property of an armature winding is, two sides of any coil should be under two adjacent poles. That means, coil span = pole pitch. The winding can either be single layer or double layer. Winding is so arranged in different armature slots, that it must produce sinusoidal emf.Types