How is a stator core made?
The stator core is built up of thin punched laminations of electrical grade steel, which are commonly called “punchings.” They are segmented, meaning that 12 to 24 punchings are laid side-by-side to form a complete 360° ring, comprising one layer.
Which material is used for stator core?
The stator frame consists of laminations of silicon steel, usually with a thickness of about 0.5 millimetre. Lamination is necessary since a voltage is induced along the axial length of the steel as well as in the stator conductors.
What is the purpose of a stator core?
The stator frame, the stator core and stator winding are the parts of the stator. The frame supports the core of the stator and protects their three-phase winding. The stator core carries the rotating magnetic field which induces because of the three-phase supply.
Why is the stator core laminated?
Stator laminations reduce eddy current by insulating the core. Thin silicon steel plates are stacked on top of one another around the center, preventing eddy current flow. With the eddy current reduced, the stator core can maintain constant power, keeping your motor running.
What is the lamination used for stator?
2. What is the lamination used for the stator? Explanation: The stator is made up of a block of laminations. The block of laminations are made up of cast iron or die cast aluminium alloy frame.
What are the different types of stator?
Stator of Three Phase Induction Motor
- Stator frame.
- Stator core.
- Stator winding or field winding.
What does a stator do in a generator?
In an electric motor, the stator provides a magnetic field that drives the rotating armature; in a generator, the stator converts the rotating magnetic field to electric current. In fluid powered devices, the stator guides the flow of fluid to or from the rotating part of the system.
What is a stator frame used for in a generator?
A stator frame is provided to support the stator core, and to contain the ventilation circuit of the generator. For medium and large generators, hydrogen of noncombustible purity is commonly used, at elevated pressure (commonly 3–6 atm absolute).
What is a stator winding fault?
Stator winding fault resulting in core damage Mechanical core degradation is mainly caused by the lack of compression of core lami‐nations, or movement of a core section in large machines (usually hydrogenerators) with seg‐mented core construction.
What is the size of a hydro generator core?
The largest hydro generator cores are approximately 20 m in diameter and up to 3 m long. The stator core is built from a stack of some 200,000‐500,000 individual steel sheets or “laminations” each 0.3 to 0.5mm thick and coated on each side with a layer of electrical insulation to prevent current flow between them.
What are the causes of electrical degradation of stator core?
Electrical degradation of stator core can be caused by operation of the core outside of its design parameters or stator winding failure. Underexcitation and overexcitation can result in high core temperatures in two different areas: the step iron and back of the core, respectively.
