What is trailing and leading pole tips?

leading pole tip (LPT) and trailing pole tip (TPT) are the two edges of the pole. for easy identification these terms are used. LPT and TPT are depends upon the direction of motion of the armature(in case of dc). while motion the armature first saws an edge of the pole that edge is called leading pole tip.

What is MNA and GNA in armature reaction?

The geometrical neutral axis (GNA) is the axis that bisects the angle between the centre line of adjacent poles. The magnetic neutral axis (MNA) is the axis drawn perpendicular to the mean direction of the flux passing through the centre of the armature.

What will happen at poles due to armature reaction?

Explanation: The armature reaction flux strengthens each main pole at one end and weakens it at the other end (cross magnetizing effect). Armature reaction with axis at 90° to the main field axis is known as cross-magnetizing mmf.

What is pole tip?

: the edge of the pole piece of a dynamo or motor which the wires on the armature pass as they enter the gap.

What is the armature reaction?

Armature reaction is the effect on the main field flux of that flux set up by the currents in the armature winding. The effect is the same for both lap- and wave-wound machines.

What is a commutator and what does it do?

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.

What is an armature reaction?

What are armature reactions?

What is the meaning of pole pitch?

The pole pitch is defined as the peripheral distance between centers of two adjacent poles in dc machine. This distance is measured in terms of armature slots or armature conductors come between two adjacent pole centers. A pole pitch in the electrical machine is equal to 180° electrical.