It is simpler to design and insulate stationary armature winding for high voltages.The stationary armature has no moving parts, thus output current is directly drawn from its terminal without the brushes and the included losses.The fraction and sparks from brushes damage and reduce their life span as well as require frequency maintenance.Rotary armature requires brushes that have a larger voltage drop at high voltage.The alternator’s stationary armature winding has huge advantages over the DC rotating armature as given below On the contrary, the DC generator’s stator holds the magnets to generate the necessary magnetic field. it has very few and non-salient poles, therefore its rotor diameter size is small while its axial length is longer than the salient pole rotor. Since the poles are not protruding out of the core, it is also known as a non-salient pole or round rotor. The poles are left unslotted as shown in the figure below. The cylindrical rotor has slots for field winding that is connected in series. It is made up of a laminated steel cylinder. Its design does not have enough mechanical strength to handle high speed.Ĭylindrical Type: such type of rotor has very few 2 or 4 poles. They are not suitable for high speed due to the increased windage loss at high speed due to their design (salient poles). They are used in low and medium-speed alternators such as in hydropower stations. The salient pole rotor has a large diameter and small axial length.
The slip ring and brushes are mounted on the shaft of the rotor. The field coil is energized by connecting its ends to a separate DC source through a pair of slip rings. The field coils are wounded across the poles and then connected in series. The pole shoes have multiple slots for damper winding that helps in preventing haunting. The salient poles are made of laminated steel or iron cast of good magnetic properties to reduce the Eddy current losses. The term salient refers to protruding or projecting as shown in the figure below. Salient Pole Type: it is a type of rotor that has a large number of protruding or projecting poles mounted on a core made of magnetic laminated steel or cast iron. This varying field generates end in the armature windings and supplies it to the load or circuit through its terminals. The rotating rotor generates changing magnetic field. A prime mover rotates the rotor using a pulley and belt. The rotor field windings are connected to an external DC supply with the help of slip rings and brushes. The field windings are placed in the rotor while the armature windings are placed in the stator. The alternator is made of a stationary armature winding and a rotating magnetic field.
Powerselect alternator generator#
Unlike DC generator that has rotating armature winding and a stationary magnetic field. Three-Phase Induction Motor – Construction, Working, Types & Applications.Single-Phase Induction Motor – Construction, Working, Types & Applications.Synchronous motor converts the input electrical power into output mechanical power.Synchronous generator (alternator) converts the input mechanical power into output electrical power.Good to know: Alternator or synchronous generator is the same machine as synchronous motor except the power flow diagrams and reverse operation e.g.
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