What are the advantages of double squirrel cage induction motor?
The advantage of a double-squirrel cage motor is that it provides high starting torque and low starting current.
What are the merits and demerits of double cage induction motor?
A double cage motor develops higher starting torque for low starting current and its rotor heating loss is more. Full load slip is higher than double cage rotor. It has higher efficiency. Slip and efficiency are lower than the single cage rotor.
What is the advantage of the double squirrel cage rotor as compared to the round bar cage rotor?
A double cage rotor has low starting current and high starting torque, therefore, it is more suitable for direct on line starting. Since effective rotor resistance of double cage motor is higher, there is larger rotor heating at the time of starting as compared to that of single cage rotor.
What are advantages of cage motors?
Squirrel Cage Motor Advantages
Maintains constant speed. The overload capacity is high. Simple starting arrangement. High power factor.
What is the difference between squirrel cage and wound rotor?
Difference squirrel cage rotor and wound or slip cage rotor
In squirrel cage rotor no slip rings or brushes. In wound or slip rotor slip rings and brushes are used. It has a simple construction. It has complicated construction.
Why squirrel cage rotor is used in induction motor?
Squirrel cage motors maximize electromagnetic induction by utilizing rotor bars to interact with the stator’s EMF. The stator usually contains windings of wire which carry an AC current; this current changes in sync with a sinusoidal curve (or “alternates”), which changes the current direction in the wire windings.
What defect is found in squirrel cage motor?
Squirrel cage induction motor cast rotor defect detection with magnetic field analysis.
Why do squirrel cage motors have low starting torque?
It suffers from the disadvantage of a low starting torque. It is because the rotor bars are permanently short-circuited and it is not possible to add any external resistance to the rotor circuit to have a large starting torque.