Which of the following statements is NOT true about the three-phase slip ring induction motor?

Slip ring induction motors are used in hoists, cranes and elevators.
There is a possibility of adding additional resistance to control speed.
It has high starting torque and low starting current.
Slip ring motors are widely used.

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 4 : Slip ring motors are widely used.

Three-phase slip ring induction motor:

A slip ring induction motor is referred to as an asynchronous motor as the speed at which it operates is not equal to the synchronous speed of a rotor.

The rotor of this type of motor is wound type. It comprises of a cylindrical laminated steel core and a semi-closed groove at the outer boundary to accommodate a 3-phase insulated winding circuit.

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Advantages of Slip Ring Induction Motor:

High and excellent starting torque to support high inertia loads.
It has a low starting current due to external resistance
Can take full load current that is 6 to 7 times higher

Disadvantages of Slip Ring Induction Motor:

Includes higher maintenance costs due to brushes and slip rings compared to squirrel cage motor
Intricate construction
High copper loss
Low efficiency and low power factor
Expensive than 3 phase squirrel cage induction motor so not widely used.

Applications of Slip Ring Induction Motor:

These motors are used where higher torque and low starting current are required.
Used in applications like elevators, compressors, cranes, conveyors, hoists, and many more.

4 views Answered 2022-09-04 04:29

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