A wound-rotor motor is a type of induction motor where the rotor windings are connected through slip rings to external resistance. Compared to a squirrel-cage rotor, the rotor of the slip ring motor has more winding turns; the induced voltage is then higher, and the current lower, than for a squirrel-cage rotor. The motor whose rotor is wound type such type of motor is called slip ring induction motor, whereas the squirrel cage motor, has a squirrel cage type rotor. The rotor of the slip ring motor has a cylindrical core with parallel slots, and each slot consists each bar. The slot of the squirrel cage motor is not parallel to each other.
Squirrel Cage Induction Motor vs Slip Ring Induction Motor Comparison of Squirrel cage induction motor with slip ring induction motor (Wound Rotor Induction Motor) is listed in the below table: Squirrel Cage Induction Motor Slip ring (wound rotor) Induction Motor In Squirrel cage induction motors the rotor is simplest and most rugged in construction In slip ring induction motors the rotor is wound type. In the motor the slip rings, brushes are provided. Compared to squirrel cage rotor the rotor construction is not simple. Cylindrical laminated core rotor with heavy bars or copper or aluminium or alloys are used for conductors. Cylindrical laminated core rotor is wound for as the number of poles of the stator.
Rotor conductors or rotor bars are short circuited with end rings. At starting the 3 phase windings are connected to a star connected rheostat and during running condition, the windings is short circuited at the slip rings. Rotor bars are permanently short circuited and hence it is not possible to connect external resistance in the circuit in series with the rotor conductors. It is possible to insert additional resistance in the rotor circuit. Therefore it is possible to increase the torque ( the additional series resistance is used for starting purposes) Cheaper cost Cost is slightly higher. No moving contacts in the rotor.
Carbon brushes, slip rings etc are provided in the rotor circuit. Higher efficiency.
Comparatively less efficiency. Low starting torque. It is 1.5 time full load torque.
Descargar traduccion espanol kingdoms of amalur reckoning dlc. High starting torque. It can be obtained by adding external resistance in the rotor circuit. Speed control by rotor resistance is not possible. Speed control by rotor resistance is possible. Starting current is 5 to 7 times the full load.
Less starting current. Advantages of Squirrel-Cage Induction Motors The advantages of squirrel-cage motors compared with the slip ring induction motors are given below (i) They are more robust and cheaper (ii) Comparatively they have higher efficiency and power factor (iii) Since the risk of sparking is eliminated by the absence of slip rings and brushes, they are explosion-proof. Advantages of Slip ring Induction Motors The advantages of the wound rotor (Slip ring) Induction motors compared with the squirrel-cage motors are given below (i) They have very high starting torque (ii) They have very low starting current (iii) They have a means of varying speed by use of external rotor resistance. Read More: Thanks for Reading Please leave your comments below.
Contents • • • • • • • • • • • • Introduction There are two main types of induction motors exists. They are, • Squirrel cage induction motor • slip ring induction motor In previous, we saw complete details related to slip ring induction motor. Here we know the fundamental details related to squirrel cage motor. What is squirrel cage induction motor? In simple words, the induction motor which uses a squirrel cage rotor is called squirrel cage induction motor. The reason behind the name “squirrel cage” is because of the type of rotor used in these motors. In these type of motors, the rotor is simplest and most rugged in construction.
These motors have much higher efficiency than slip ring induction motors. Most of the industries prefer these type of motor due to less maintenance cost, higher efficiency, and their lightweight construction. Let see the construction of squirrel cage induction motor.
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