Electrical Engineering World
Answer:
When an induction motor operates at synchronous speed, it ceases to induce rotor currents, leading to loss of torque and failure to start.
Reasoning:
Induction motors rely on the relative motion between the rotating magnetic field and the rotor to induce currents and generate torque. At synchronous speed, this relative motion diminishes, preventing the induction of currents. Consequently, the motor fails to produce torque, impeding its ability to start or operate effectively.
FAQs:
Q: Can an induction motor run at synchronous speed? A: It is technically challenging, as synchronous speed hinders rotor current induction, causing operational issues.
Q: What happens if an induction motor runs at synchronous speed? A: The motor loses its ability to induce rotor currents, resulting in a lack of torque and failure to start.
Q: Can synchronous speed be achieved intentionally in induction motors? A: Achieving synchronous speed intentionally is not practical due to inherent motor design.
Q: Does running at synchronous speed damage the motor? A: Prolonged operation at synchronous speed may cause overheating and potential damage.
Q: Can a motor transition from synchronous to asynchronous speed during operation? A: No, the motor cannot spontaneously transition from synchronous to asynchronous speed without external intervention.
Q: Is synchronous speed the same for all motors? A: No, synchronous speed depends on the motor’s design and power frequency.
Q: How does synchronous speed relate to the power supply frequency? A: Synchronous speed is directly proportional to the power supply frequency.
Q: Can synchronous speed be beneficial in any motor applications? A: Synchronous speed is generally avoided, as it impairs motor functionality; however, synchronous motors are designed to operate at this speed intentionally.
Q: Is there a safety risk associated with synchronous speed operation? A: Prolonged operation at synchronous speed can lead to increased heating, posing a safety risk.
Q: Can a motor recover from synchronous speed and resume normal operation? A: Yes, stopping and restarting the motor allows it to return to asynchronous operation.