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As an energy efficient application, for what does the slip power recovery system fit well?

As an energy efficient application, for what does the slip power recovery system fit well? Correct Answer Slip ring motors only

Slip Power Recovery Schemes:

This system is mainly used for slip ring induction motor speed control. The speed control in the induction motor has poor efficiency due to the wasting of slip power in the rotor circuit. By using a recovery scheme, the induction motor speed is controlled to avoid slip power loss.

These are used in both constant power and constant torque drives.

Slip power recover scheme is classified into two types:

1. Scherbius system:

  • Here the variable frequency (SF) rotor power is converted to dc by a diode bridge rectifier and then an inverter converts it back to a.c (50/60 Hz) and is fed back to the supply mains.
  • Thus, the slip power is fed back to the source instead of wasting it in the rotor resistance thereby increasing the efficiency of the drive.
  • In scherbius drive, we get super synchronous speed. It is constant.
     

2. Kramer drive:

  • Here the variable frequency (SF) rotor power is converted to dc by a diode bridge rectifier the dc power is fed to dc motor which is mechanically coupled to the induction motor.
  • Thus, the torque supplied to the load is the sum of the torque produced by induction and dc motor. In this scheme, slip power is utilized mechanically.
  • In Kramer drive, we get the subsynchronous speed.

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