How is induction motor rotor made?

How is rotor manufactured?

Rotor Manufacturing Process

Stamping or laser cutting of laminations. Inspection of individual parts. Stacking, staking, and skewing of laminations. Bonding.

How induction motor are manufactured?

Manufacture of three phase induction motors is an activity which IEML has been involved in since 1955. A motor consists of a housing (usually cast and machined from iron), a stator assembly, a rotor assembly and the endshields. The diagram of a typical induction motor is shown in Exhibit 1.

What is induction motor rotor?

Rotor as the name suggests it is a rotating part of an electrical machine, in which current is induced by transformer action from rotating magnetic field. Induction motor rotor is of two types: Squirrel Cage Rotor.

How are motors manufactured?

The rotor assembly is sent to motor assembly. Two end frames are produced and sent to motor assembly. At the final operation, the wound stator assembly, rotor assembly, two end frames, and miscellaneous parts are assembled into a complete motor. The motor is then tested, painted, and packed for shipment.

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What is rotor speed in induction motor?

Rotor speed is the actual running speed of rotor. In 3phase induction motor also known as asynchronous motor, magnetic field of ‘stator winding’rotates at synchronous speed which links with the rotor.

How are stators manufactured?

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.

Why rotor core is laminated?

The Importance of Lamination

The lamination process consistently reduces the loss of iron. Since the lamination is made of steel, the assembly will also reduce Eddy current loss. Because of this, the rotor core will not be subjected to iron losses since the frequency of the rotor current is low.

Why is an induction motor called a rotating transformer?

An induction motor is sometimes called a rotating transformer because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side.

How does an induction motor run?

The induction motor always runs at speed less than its synchronous speed. The rotating magnetic field produced in the stator will create flux in the rotor, hence causing the rotor to rotate.

What is the rotor made of in an induction motor?

The Rotor. Alongside the Stator, the most important part of an AC induction motor is the Rotor. This consists of Rotor bars, usually made of aluminium or copper, which are joined at their ends to rings made from the same material. This is sometimes known as a ‘Squirrel Cage’ Rotor (see Figure 2).

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How many types of rotor are there in induction motor?

Induction motor rotors may be of two types, wound rotor or squirrel-cage rotor. A wound rotor has windings similar to and wound for the same number of poles as the stator. The rotor windings are connected to insulated slip rings mounted on the rotor shaft.

Why the rotor slots of an induction motor are skewed?

The rotor or stator slot of the induction motor skewed through some angle so that the bars lie under alternate harmonic poles of the same polarity or other words, bars must be skewed through two pitches. The main purpose of skewing is to reduce the magnetic logging between the starter and the rotor.

What is the difference between stator and rotor?

The term, “stator” is derived from the word stationary. The stator then is the stationary part of the AC motor. The rotor is the rotating electrical component. It also consists of a group of electro-magnets arranged around a cylinder, with the poles facing toward the stator poles.

What separates the stator and the rotor?

Introduction. The stator and rotor both are the parts of the electrical motor. The significant difference between the rotor and the stator is that the rotor is the rotating part of the motor whereas the stator is the stationary part of the motor.

What is the difference between stator and armature?

A synchronous motor is virtually identical to a synchronous generator. Thus, the armature is the stator and the field is the rotor. DC machines. In DC machines, both motors and generators, the armature is the rotor, and the field is the stator.

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