What are the advantages and disadvantages of Induction Motors?
Advantages:
Disadvantages:
What is the condition for maximum torque in induction motor?
Starting torque will be maximum when the rotor resistance / phase is equal to standstill rotor reactance / phase.
Slip ring induction motor advantages and disadvantages compared to squirrel cage motors?
Advantages:
Disadvantages:
Methods to control speed of Wound Rotor Motors?
The speed of wound rotor motors are changed by changing the slip of the motor. This can be achieved by:
Explain how Torque-Slip Characteristics vary when adding resistance to rotor circuit?
The addition of resistance to the rotor circuit does not change the value of maximum torque but it only changes the value of the slip at which the maximum torque occurs.
Disadvantages of Star-Delta Starting of Induction motor?
In Star-Delta starting induction motor stator is connected in star connection for starting after picking up speed it is connected to delta connection. When induction motor is connected in star connection stator phase voltage reduced by 1/(31/2 ) times the line voltage. This also results in reduced starting torque (1/3 times compared to delta connection).
Why Induction Motor name has come?
In Induction motor there is no electrical contact to the rotor. Electrical currents are induced in to the rotor circuit. Hence the name Induction motor has come.
What happen when Induction motor run at synchronous speed?
When the induction motor runs at synchronous speed, there will be no induced emf in to the rotor circuits. Therefore no rotor currents and no torque is developed. Hence Induction motor will come to halt.
What are different types of Induction Motors available?
Induction motors are of two types based on their construction
What is the advantage of Slip Ring Induction Motor?
By providing external resistance to the rotor circuits during starting of the motor starting torque can be improved and starting currents can be reduced
What is the advantage of Squirrel Cage Induction Motor?
Low cost, rugged construction and less maintenance are the advantages of squirrel cage induction motors
What is the speed variation of the induction motor from no load to full load?
The decrement in the speed of the small rating Induction Motor from no load to full load will be around 4 to 5 percent and 2 to 2.5 percent in the case of large size induction motors
DC Series Motor Advantages Disadvantages
In DC series motor field coils or winding will be in series with the armature winding. The conductor size of the field winding will be having thick wire (large cross section) with lesser turns.
Advantages of DC Series Motors:
Disadvantages of DC Series Motor:
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