What are the advantages and disadvantages of slip power recovery scheme for induction motor drive?
What are the advantages and disadvantages of slip power recovery scheme for induction motor drive?
This system is mainly used for Induction motor speed control. The speed control in induction motor has poor efficiency due to wasting of slip power in the rotor circuit….Slip power recovery schemes.
| Advantages | Disadvantages |
|---|---|
| Instead of other speed control methods working range can be obtained at any speed | Motor turns ration is less than unity |
What are the advantages of slip power recovery?
The main advantage of this method is that a smooth speed control is possible. Similarly wide range of speed control is possible. Another advantage of the system is that the design of a rotary converter is practically independent of the speed control required.
What are the disadvantages of slip ring induction motor?
Initial and maintenance cost is more compared to squirrel cage motor because presence of slip rings, brushes, short circuiting devices etc. Speed regulation is poor when operated with external resistances in rotor circuit.
What are the advantages and disadvantages of wound rotor induction?
The complication and maintenance associated with brushes and slip rings is a disadvantage of the wound rotor as compared to the simple squirrel cage rotor. This motor is suited for starting highly inertial loads. A high starting resistance makes the high pull out torque available at zero speed.
What are the advantages of slip system?
The main advantages of the slip system are: (1) The bank saves a lot of clerical labour as most of the slips are filled in by its customers. (2) Subsidiary books are avoided as posting is done from slips. (3) Entries can be recorded with minimum delay as slips can easily pass from hand to hand among clerks concerned.
What is slip and slip power in induction motor?
The slip energy recovery method provides the speed control of a slip ring induction motor below its synchronous speed. A portion of rotor AC power (slip power) is converted into DC by a diode bridge. The smoothing reactor is provided to smoothen the rectified current.
Why the slip power recovery scheme is suitable mainly for drives with a low speed range?
Slip Energy Recovery is one of the methods of controlling the speed of an Induction motor. This method is also known as Static Scherbius Drive. In the rotor resistance control method, the slip power in the rotor circuit is wasted as I2R losses during the low-speed operation. The efficiency is also reduced.
What are types of slip power recovery scheme?
Slip power recover scheme is classified into two types: 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.
What are the disadvantages of rotor resistance starter?
Disadvantages of Rotor Resistance Starter
- Lower efficiency due to the I2R losses in the external resistance connected in the rotor circuit.
- This starter can only be used for starting a slip ring induction motor.
- It needs frequent maintenance due to presence of slip rings and carbon brushes.
Which of the following is the disadvantages of rotor resistance control?
The major disadvantage of the rotor resistance control method is that the efficiency is low because of the additional losses present in the resistors connected within the rotor circuit. The efficiency is greatly reduced at low speeds because of the higher value of the slip.
What are the disadvantages of slip system?
DISADVANTAGES OF SLIP SYSTEM OF POSTING It may be lost, distorted or misappropriated very easily. Thus it is unjustified to maintain the records in form of the slips. NO VERIFICATION: As the posting is done directly to the ledger accounts and no entry is made in the subsidiary books.
What is the function of slip power recovery scheme?
The slip power recovery scheme comprising Static Scherbius Drive provides speed control of slip ring induction motor below synchronous speed.
What is slip power recovery in induction motor?
SLIP POWER RECOVERY SCHEMES This system is mainly used for Induction motor speed control. The speed control in induction motor has poor efficiency due to wasting of slip power in the rotor circuit. By using recovery schemes the induction motor speed is controlled to avoid slip power loss.
What is the relationship between power factor and slip slip?
Slip is inversely proportional to power factor, hence if power factor decreases the slip increases. Output power cascading: The cascaded set with excessive excitation of auxiliary DC machine will run at high speed with low torque. The speed of main motor in this scheme is controlled by field regulation of auxiliary DC machine.
