What is the stator core?
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.
What is the purpose of stator core?
The primary functions of a stator core are: (1) to hold the stator windings in place, and (2) to transmit flux. A stator core in a large AC machine is constructed from thin laminated sheets of electrical grade steel such as ASTM A 345.
Why stamping is used in stator core?
The added silicon makes the steel more effective and faster at building and maintaining magnetic fields. This means that silicon steel improves the efficiency of any device using steel as a magnetic core material. Metal stamping is one procedure used to create motor laminations for different applications.
What are the parts of a stator?
The stator core, stator winding and the outer frame are the three parts of the stator whereas the rotor core and field winding are the parts of the rotor. The three-phase supply is given to the winding of the stator.
How is a stator construction?
The stator of the motor is made up of many thin steel laminations stacked together and held in the rotor housing. The conductors making up the coils in the stator windings are looped through slots in the stator lamination.
What are rotor windings?
rotor winding is of the squirrel-cage type where solid conductors in the slots are shorted together at each end of the rotor iron by conducting end rings. In such machines there is no need to insulate the conductors from the iron.
What is rotor lamination?
The Importance of Lamination The rotor consists of a steel lamination and resembles a cylindrical core with evenly-spaced slots for its three-phase windings. The lamination process consistently reduces the loss of iron. Since the lamination is made of steel, the assembly will also reduce Eddy current loss.
What is a stator winding?
In electric motor: Induction motors. A three-phase set of stator windings is inserted in slots in the stator iron. These windings may be connected either in a wye configuration, normally without external connection to the neutral point, or in a delta configuration.
What is a stator assembly?
The stator assembly is a stationary coil in an AC motor. These types of assemblies include a stator core and a coil, which is wound and inserted in the stator core with ends connected to lead wires. When specified, insulation can also be placed between coil phases within the slots and/or within the coil end-turns.
How many types of stators are there?
Stator of Three Phase Induction Motor The stator of the three phase induction motor consists of three main parts: Stator frame. Stator core. Stator winding or field winding.
What are stator windings?
What is rotor torque?
The locked rotor torque is the torque the electrical motor develops when its starts at rest or zero speed. The magnitude of the locked rotor current is determined by motor horsepower and design characteristics. Normally, it will be six to seven times of the motor full-load current.
What makes up the core of a stator motor?
STATOR • The stator is an static part of the motor which acts as outer body to house the driven windings on a laminated steel core for creating a rotating magnetic field. • The stator core is made up of a stack of pre punched laminations assembled into a motor housing that is made of aluminum or cast iron or no separate housing designs. 4.
How is the stator core affected by deterioration?
Although the stator core is one of the most reliable parts of a rotating machine, and multiple stator winding re‐winds are possible on the same core, various deterioration process may affect the stator core, and particularly the lamination insula‐tion. These processes can be divided into thermal, mechanical and electrical.
Which is an integral part of the stator frame?
Another integral part of the stator is the stator core which is supposed by the stator frame. Actually you can see the combined diagram of both the stator core as well as the stator frame (first of the three diagrams above).
How are the teeth of a stator core slit?
To accommodate stray flux impinging on the ends of the core, the ends of the teeth are commonly slit to reduce eddy currents that are produced in the end punchings. It is common to cool the stator core with gas (air or hydrogen), and radial ducts are generally provided in the core for this purpose. Water cooling is used by some manufacturers.