Q4Basic Electrical Engineering
Question
2 marks
State the torque-slip characteristics of induction motor.
Answer
The torque-slip characteristic curve of an induction motor depicts how output torque changes non-linearly as slip increases from 0 (synchronous speed) to 1 (standstill).
- Low Slip Region (Normal Operation): Near synchronous speed (), the torque is directly proportional to slip (). The curve is a straight line. The motor operates stably here.
- Medium Slip Region: As slip increases due to heavier loads, torque peaks at a maximum value known as the Pull-out or Breakdown Torque. If the load exceeds this, the motor will stall.
- High Slip Region (Starting): As slip approaches 1 (standstill), the torque is inversely proportional to slip (). The curve droops downwards.