Correct Answer - Option 1 : AC slip ring motor
- Crane travel needs high starting torque for their operation.
- The Slip-ring Induction motors in comparison to Squirrel cage motors have low starting current and high starting torque.
- These motors are used for most industrial drives of high power and requiring high starting torques.
- In the Slip-ring induction motor, the starting torque is directly proportional to rotor resistance.
- Therefore, by increasing the rotor resistance, high starting torques can be obtained.
∴ The motor normally used for crane travel is AC slip-ring motor.
Applications Of DC shunt motor:
- Industrial Use
- Lathes
- Drills
- Boring Mills
- Shapers
- Spinning and Weaving Machines
Applications Of Synchronous motor:
- Used for large power, low head pumps
- Reciprocating pumps
- Steel mills, Rolling mills
- Compressors
- Induced drought fans
- Crushers and Blowers
- Synchronous condensers
Applications Of DC differentially compounded motor:
- Because of their poor torque characteristics, differentially compound motors are rarely used
- This is the only motor that may have zero speed regulation
