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How To Stop Grinding Teeth At Night Kids Emblem3 Shirtless Construction of squirrel cage induction motor explained
The reason behind the name 'Squirrel cage' is due to the form of rotor found in these motors. Almost 95% from the induction motors used is of squirrel cage type. Also know of the Double Squirrel Cage motor. Know regarding the different classes of Squirrel cage Induction Motors
We have seen the classification of A.C. motors and discussed in greater detail the working principle, concept behind rotor rotation and a lot of other aspects of induction motor. Now let us discuss at length, the commonest form of induction motor, the 'Squirrel cage' induction motor. The cause of the name 'Squirrel cage' is due to the type of rotor employed in these motors. Almost 95% with the induction motors used is of squirrel cage type. And in the previous article on Types of Electrical Motors, we've classified Induction Motors based on the type of rotor used. They are
1. Squirrel Cage Induction Motors &
2. Slip-Ring or Wound-rotor Induction Motors
Any Induction Motor features a Stator plus a Rotor. The construction of Stator for almost any induction motor is actually the same. But the rotor construction differs with regards to the type which can be specified above.
Stator:
The stator will be the outer most component within the motor which may be seen. It might be constructed for single phase, three phase or perhaps poly phase motors. But basically merely the windings on the stator vary, not the basic layout of the stator. It is almost same for just about any given synchronous motor or a generator. It is consisting of number of stampings, which are slotted to obtain the windings. Lets start to see the construction of an three phase stator. The three phase windings are placed about the slots of laminated core and these windings are electrically spaced 120 degrees apart. These windings are connected as either star or delta dependant on the requirement. The leads are obtained usually three in number, introduced to the terminal box mounted for the motor frame. The insulation between your windings are often varnish or oxide coated.
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The Rotor: Squirrel Cage Rotor:
This kind of rotor consists of an cylindrical laminated core with parallel slots for carrying the rotor conductors, which can be not wires, as we think, but thick, heavy bars of copper or aluminium (aluminium) or its alloys. The conductor bars are inserted derived from one of end with the rotor in addition to being one bar in each slot. There are end rings that are welded or electrically braced or perhaps bolted at both ends from the rotor, thus maintaining electrical continuity. These end rings are short-circuited, and they give a beautiful look similar to a squirrel thus the name.
One important examine be noted would be that the end rings and also the rotor conducting bars are permanently short-circuited, thus it isn't feasible to add any external resistance in series while using rotor circuit for starting purpose. The rotor conducting bars usually are not parallel towards the shaft, but they are purposely given slight skew. In small motors, the rotor is fabricated in another way. The entire rotor core is put in a mould and the rotor bars & end-rings are cast into one piece. The metal widely used is aluminium alloy. Some really small rotors which operate around the basis of eddy current, have their own rotor as solid steel without any conductors.
1. It helps in decrease in magnetic hum, thus keeping the motor quiet,
2. It also helps in order to avoid 'Cogging', i.e. locking tendency with the rotor. The tendency of rotor Teeth remaining under the stator Teeth due for the direct magnetic attraction between your two,
3. Increase in effective ratio of transformation between stator & rotor,
4. Increased rotor resistance on account of comparatively lengthier rotor conductor bars, &
5. Increased slip for the given torque.
We have previously discussed the rotor that is of squirrel cage type has two end rings, that are permanently shorted using the rotor conductors. Thus external resistance can't be added on the rotor circuit. Since the rotor has a very low resistance, the starting torque was bad. The starting torque might be increased by having a cage of high resistance, however the motor will have a inadequate efficiency during normal running conditions, since there will be more Cu losses. So Mr. Boucheort, invented a motor, which had two independent cages on a similar rotor. The outer cage is made up of bars of high resistance metal, whereas the inner cage has low-resistance copper bars. Thus the outer cage includes a high resistance with low reactance to resistance ratio and also the inner cage has low resistance but high reactance to resistance ratio. Thus the outer cage develops a maximum torque at starting, whilst the inner cage does so at about 15% slip.
The three phase Squirrel cage induction motors are classified into 6 different standard types depending on their electrical characteristics. They are differentiated within the below table:
Remarks:
Class A: The squirrel cage rotor has relatively low resistance & reactance. The general construction of the slots inside rotor is such that the rotor bars are put close towards the surface in an attempt to reduce the reactance. Class B: These motors may be started with a full-load while developing normal starting torque. The rotor is designed with deep and narrow slots in order to obtain high reactance while starting. These motors are very well suited for those applications its keep is a limitation in starting current. These motors can also be started with reduced voltage. Class C: These are double squirrel cage motors. These double squirrel rotors combine high starting torques with low starting currents. These motors have inherent high starting torque characteristics and ideal for reduced voltage starting. Class D: These motors have high starting torques that's achieved by design from the rotor slots. These rotor slots have thin rotor bars, which make the leakage flux in the rotor low as well as the useful flux high. Class E: These motors have relatively very low slip at rated load. For motors above 5 Kw rating, the starting current could possibly be sufficiently high concerning require a compensator or a resistance starter. Class F: These motors combine low starting torque with low starting current and may be started with full voltage. This is achieved by the design with the rotor slots which is displayed inside figure. In the next article, we're going to deal concerning the starting procedure as well as the different methods adopted in starting a squirrel cage induction motor. Also various types of speed control will likely be emphasized.
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How To Stop Grinding Your Teeth Bruxism Treatment Biofeedback Tooth Sensitivity ??? 10 Biggest Causes of Tooth Sensitivity
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