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Squirrel cage induction motor can be used for
Centrifugal pump
Industrial drive
Lathe
All of above
All of above
The squirrel cage induction motor (SCIM) is the most widely used AC motor in industry due to its simple, robust construction, high efficiency, and low maintenance requirements. It is a constant-speed machine that serves as the workhorse for diverse applications ranging from constant-torque loads to variable-load industrial machinery.
The squirrel cage induction motor (SCIM) is the most widely used AC motor in industry due to its simple, robust construction, high efficiency, and low maintenance requirements. It is a constant-speed machine that serves as the workhorse for diverse applications ranging from constant-torque loads to variable-load industrial machinery.
NsтАЛ=P120fтАЛ тАФ Synchronous speed of the rotating magnetic field
TтИЭsE2тАЛ┬░2R2тАЛ/(R2тАЛ┬░2+(sX2тАЛ)2) тАФ Torque equation for induction motor
The motor operates on the principle of electromagnetic induction between the stator and the rotor. When the stator is energized by a polyphase supply, a rotating magnetic field (RMF) is produced. This RMF cuts the stationary rotor bars, inducing an emf and resulting current, which produces a torque according to Lenz's law, causing the rotor to rotate in the direction of the RMF at a speed NrтАЛ<NsтАЛ.
Construction consists of a cylindrical rotor core with uninsulated conductive bars short-circuited at both ends by end rings.
It is inherently a constant speed machine, making it unsuitable for applications requiring wide speed variation.
Requires low maintenance as it lacks brushes and slip rings.
Rugged and simple construction
Low cost and high reliability
High efficiency and excellent speed regulation
Low starting torque
High starting current (often 5-7 times rated current)
Poor speed control capabilities compared to DC motors
Centrifugal pumps and fans
Lathe machines and industrial workshop tools
Conveyor belts and milling machines
The SCIM is often referred to as a 'rugged workhorse' in industrial settings.
For high starting torque applications, wound rotor induction motors are typically preferred over standard squirrel cage variants.
D is correct тАФ The squirrel cage induction motor is versatile and robust, making it suitable for a vast array of constant-speed industrial applications including pumps and machine tools.
In exams, if an induction motor application requires high starting torque, look for 'Slip Ring' or 'Wound Rotor' motors instead of 'Squirrel Cage'.