Polyphase Induction Motor (Basics)
INTRODUCTION :-
An induction motor (IM) is a type of asynchronous AC motor where power is supplied to the rotating device by means of electromagnetic induction.
The induction motor with a wrapped rotor was invented by Nikola Tesla Nikola Tesla in 1882 in France but the initial patent was issued in 1888 after Tesla had moved to the United States. In his scientific work, Tesla laid the foundations for understanding the
way the motor operates. The induction motor with a cage was invented by Mikhail Dolivo-Dobrovolsky about a year later in Europe. Technological development in the field has improved to where a 100 hp (74.6 kW) motor from 1976 takes the same volume as a
7.5 hp (5.5 kW) motor did in 1897. Currently, the most common induction motor is the cage rotor motor.
An electric motor converts electrical power to mechanical power in its rotor
(rotating part). There are several ways to supply power to the rotor.
In a DC motor this power is supplied to the armature directly from a DC source, while in an induction motor this power is induced in the rotating device. 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.
Induction motors are widely used, especially polyphase induction motors, which are frequently used in industrial drives.
Induction motors are now the preferred choice for industrial motors due to their rugged construction, absence of brushes (which are required in most DC motors) and the ability to control the speed of the motor.
A polyphase IM is the most popular type of A.C.Motors . It is very commonly used for industrial drive. Because it has superior characteristic (simple design, rugged in construction and reliable in service due to absence of Commutator. It has high efficiency, low initial cost, Easy operation, Simple maintenance and simple control gear for Starting.
●It is #Single fed motor (stator feed).
●Torque development in it has origin in current induction in the rotor which is only possible at non synchronous speed, Hence it is #asynchronous_machine.
● This motor has come to be called as induction motor, because stator delivers energy to rotor by means of Induction.
An induction motor (IM) is a type of asynchronous AC motor where power is supplied to the rotating device by means of electromagnetic induction.
The induction motor with a wrapped rotor was invented by Nikola Tesla Nikola Tesla in 1882 in France but the initial patent was issued in 1888 after Tesla had moved to the United States. In his scientific work, Tesla laid the foundations for understanding the
way the motor operates. The induction motor with a cage was invented by Mikhail Dolivo-Dobrovolsky about a year later in Europe. Technological development in the field has improved to where a 100 hp (74.6 kW) motor from 1976 takes the same volume as a
7.5 hp (5.5 kW) motor did in 1897. Currently, the most common induction motor is the cage rotor motor.
An electric motor converts electrical power to mechanical power in its rotor
(rotating part). There are several ways to supply power to the rotor.
In a DC motor this power is supplied to the armature directly from a DC source, while in an induction motor this power is induced in the rotating device. 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.
Induction motors are widely used, especially polyphase induction motors, which are frequently used in industrial drives.
Induction motors are now the preferred choice for industrial motors due to their rugged construction, absence of brushes (which are required in most DC motors) and the ability to control the speed of the motor.
A polyphase IM is the most popular type of A.C.Motors . It is very commonly used for industrial drive. Because it has superior characteristic (simple design, rugged in construction and reliable in service due to absence of Commutator. It has high efficiency, low initial cost, Easy operation, Simple maintenance and simple control gear for Starting.
●It is #Single fed motor (stator feed).
●Torque development in it has origin in current induction in the rotor which is only possible at non synchronous speed, Hence it is #asynchronous_machine.
● This motor has come to be called as induction motor, because stator delivers energy to rotor by means of Induction.
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