Table of Contents
- 1 Why the rotor slots are not made parallel to the shaft?
- 2 Which induction motor has rotor slots usually not quite parallel to the shaft but are purposely given a slight skew?
- 3 What is the use of the slot in the rotor *?
- 4 Why are slot made deeper in the machine?
- 5 What is meant by angle in induction motor rotors?
- 6 Why slots in squirrel cage rotors are not made parallel to shafts?
Why the rotor slots are not made parallel to the shaft?
The main reason for using a skewed rotor is to prevent the Cogging. In simple words, Cogging is the phenomenon of the magnetic locking between Stator and Rotor of Induction Motor. This magnetic locking occurs when the number of stator slots is equal to the number of rotor slots.
Why the slots on the rotor of induction motor are usually skewed?
The rotor or stator slot of the induction motor skewed through some angle so that the bars lie under alternate harmonic poles of the same polarity or other words, bars must be skewed through two pitches. The main purpose of skewing is to reduce the magnetic logging between the starter and the rotor.
Which induction motor has rotor slots usually not quite parallel to the shaft but are purposely given a slight skew?
In the squirrel-cage induction motor the rotor slots are usually given slight skew.
Why the rotor slots are slightly skewed in squirrel cage induction motor?
The rotor slots are slightly skewed in squirrel – cage induction motor to. increase the strength of rotor bars. reduce the magnetic hum and locking tendency of rotor.
What is the use of the slot in the rotor *?
What is the use of the slot in the rotor? Explanation: The rotors slots are used for inserting the field windings. The rotor slots are also used for securing the field windings also. 13.
What is the relationship between the rotor bars of a squirrel cage motor and the starting current?
The AC current passed through the stator creates an EMF that fluctuates with the AC frequency, which “rotates” around the rotor, inducing opposing magnetic fields in the rotor bars, thus causing motion.
Why are slot made deeper in the machine?
Why are slot made deeper in the machine? Explanation: The slots used in the machine are basically deeper slots. The slots are made deeper even more to increase the leakage reactance and to limit the short circuit current.
Why is the air gap between the rotor and stator of a 3 phase induction motor kept as short as possible?
The smaller the air gap is, the lower that reluctance, and thus the higher the magnetic flux (which is the magnetic analog of current), allowing the motor to work more efficiently and at a higher power.
What is meant by angle in induction motor rotors?
In the induction motor rotor, the slots for the placement of conductors are not made exactly in parallel with the rotor shaft. A slight angle is maintained that means the rotor slots are made in some angle with the rotor shaft.
What is the torque of induction motor?
The torque of the induction motor is proportional to the product of the rotor current and the rotor power factor. The length of the rotor bars gets increased with skewing.
Why slots in squirrel cage rotors are not made parallel to shafts?
In Squirrel cage rotor, slots in lamination or rotor core is not made parallel to the rotor shaft. A slight angle is maintained due to some advantages.
What is the magnetic locking between stator and rotor?
When the rotor is skewed or the slots are made in some angle, the magnetic locking between stator and rotor is eliminated. As the slots are made in some angle, that means the aluminum bars (Which used as conductors) also placed in some angle. So when the magnetic flux is produced by the stator winding, the rotor bars cut the flux uniformly.