MODULE: ELECTRICAL ENGINEERING TECHNOLOGY III/ELECTRICAL MACHINES & CONTROL
UNIT 3: SINGLE PHASE A.C GENERATOR
INTRODUCTION
Single-phase generator (also known as single-phase alternator) is an alternating current electrical generator that
produces a single, continuously alternating voltage. Single-phase generators can be used to generate power
in single-phase electric power systems. However, polyphase generators are generally used to deliver power
in three-phase distribution system and the current is converted to single-phase near the single-phase loads instead.
Therefore, single-phase generators are found in applications that are most often used when the loads being driven
are relatively light, and not connected to a three-phase distribution, for instance, portable engine-generators.
Larger single-phase generators are also used in special applications such as single-phase traction power for railway
electrification systems.
THE CONSTRUCTION OF SINGLE-PHASE A.C GENERATOR
The simple single phase AC generator has two main parts – Rotor and Stator. The rotor is a rotating component and
the stationary part of a machine is a stator.
1. Stator
The stator is a stationary component that efficiently holds armature winding. The armature winding purpose is to
carry current to the load and the load can be any external equipment that consumes electrical power. It consists of
three main parts:
Stator Frame – It is an outer frame that is used to hold stator core as well as armature windings.
Stator Core – It is laminated with steel or iron to reduce eddy current losses. Slots are made on the interior
part of a core to hold armature windings.
Armature Windings – Armature windings are wound on the slots of armature core.
Prepared by Omondi Ferdinand – 0735 766 013/0712 747 442 1
Engineering Trainer – KMTC - Kisumu Campus
UNIT 3: SINGLE PHASE A.C GENERATOR
INTRODUCTION
Single-phase generator (also known as single-phase alternator) is an alternating current electrical generator that
produces a single, continuously alternating voltage. Single-phase generators can be used to generate power
in single-phase electric power systems. However, polyphase generators are generally used to deliver power
in three-phase distribution system and the current is converted to single-phase near the single-phase loads instead.
Therefore, single-phase generators are found in applications that are most often used when the loads being driven
are relatively light, and not connected to a three-phase distribution, for instance, portable engine-generators.
Larger single-phase generators are also used in special applications such as single-phase traction power for railway
electrification systems.
THE CONSTRUCTION OF SINGLE-PHASE A.C GENERATOR
The simple single phase AC generator has two main parts – Rotor and Stator. The rotor is a rotating component and
the stationary part of a machine is a stator.
1. Stator
The stator is a stationary component that efficiently holds armature winding. The armature winding purpose is to
carry current to the load and the load can be any external equipment that consumes electrical power. It consists of
three main parts:
Stator Frame – It is an outer frame that is used to hold stator core as well as armature windings.
Stator Core – It is laminated with steel or iron to reduce eddy current losses. Slots are made on the interior
part of a core to hold armature windings.
Armature Windings – Armature windings are wound on the slots of armature core.
Prepared by Omondi Ferdinand – 0735 766 013/0712 747 442 1
Engineering Trainer – KMTC - Kisumu Campus
