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Why are end rings or rotor conductors fitted to the rotor of a squirrel cage motor?
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Why are the slip rings needed in dc motor?
Slip rings are needed to connect a rotating armature to external fixed circuits.
What will happen if the slip ring connection is open?
The motor will not work. The slip rings are used to in conjunction with the brushes to deliver a current to the rotor. The set of rings are a complete electrical circuit within the motor. In a synchronous motor the rings are used to supply voltage to the rotors pole coils. In operation these coil poles follow the rotating magnetic field in the stator.
What is the function of a split ring commutator?
The split rings cause the direction of the magnetic field in the armature to change direction as the motor rotates. If this didn't happen the motor would not rotate. Slip rings can be used for an AC motor which causes the direction of the magnetic field to change with the AC waveform.
Why it is not possible to insert the external resistance in the rotor circuit in a cage induction motor?
A squirrel-cage rotor consists of uninsulated copper or alumnium bars, short-circuited by rings located at opposite ends, and semi-enclosed within a laminated iron rotor, and there is no provision for any form of external connection. So it would be quite impractical to do what you suggest.
What is the role of split rings in electric motors?
Split rings keep the current flowing in the same direction or the motor turning in the same direction when using alternating current which reverses direction in its cycle..
When will a synchornous motor acts as an induction motor?
If there is an extra winding called the "damper winding" in addition to the field winding.Then the synchronous motor will operate as a squirrel cage induction motor.Whats is a damper winding ?A damper winding is made up of copper bars which are placed in the slots in the pole faces of the rotor.These are short circuited with the help of end rings in a squirrel cage induction motor.
Why short circuiting rings are used in squirrel cage motor?
Squirrel Cage motor is a kind of Induction Motor. The reason an induction motor sometimes refered to a rotating transformer is because the stator (Primary windings in a transformer), which is powered to set up a magnetic field induces a current in the armature coils (secondar coils in a transformer). However, instead of giving an electrical power output, the coil is short circuited to produce mechanical output (torque in this case)
Where can engagement rings be fitted or altered?
Engagement rings can always be fitted or altered at the place the ring was purchased, usually for free or at a discount, however all jewelry stores can fit and alter rings, although some mail it off to be altered elsewhere which takes much longer.
Where is piston rings located in engine?
The piston rings are fitted round the piston to make a better gas-tight fit in the cylinder.
Will it hurt the motor if you drive it with worn rings?
If you have worn rings, the motor is already hurt. If the bearings are as bad as the rings, catastrophic failure is right around the corner.
How do you start a single phase slip ring induction motor?
a single phase motor must have at least 4 poles one set is connected to the line the other is connected in series thru a capacitor or inductor to shift phase and set up a rotating magnetic field the rotor usually has a squirrel cage that will start turning the slip rings can have different purposes depending on how the rotor is wound if the highest rpm of the motor is a multiple of the line frequency 3600RPM for 60Hz 2 pole you apply dc to the winding to make it synchronous. if the hi speed of the motor is 3470RPM the squirrel cage is weak and you must short the rings to get up to the high speed there is beauty in this in that if you vary the resistance from short to open it will be a variable speed motor
How many Slip rings in synchronous motor?
If the synchronous motor is single phase then there are two slip rings & if this motor is three phase so the slip rings are three in number. Correction; I have never seen a single phase synchronous motor. It would cost more that it was worth. A synchronous motor has a separately excited field. If the excitation comes from a stationary DC source it has 2 slip (collector) rings. A brushless induction motor has no slip rings because the exciter armature rotates and so do the rectifiers. A permanent magnet motor, used with variable frequency drives, is another type of synchronous motor that has no slip rings. A three phase motor with 3 slip rings is a Wound Rotor motor. Wound rotor motors are variable speed motors that were used for such applications as bridges and cranes before variable speed drives.
When the slip ring induction motor is preferred?
larger synchronous motors start with a squirrel cage and run when dc is applied thru the slip rings small motors can have magnets in the rotor these can accelerate from rest to synchronous speed in a few seconds
Can the position of the rotor and stator in an AC motor be inverted?
In principle they can be exchanged but the result would be a more expensive motor. Imagine an induction motor with the AC applied to the rotor. That would need slip rings and brushes which would need replacing now and again. All the customers would go for the other sort with the AC applied to the stator and a simple squirrel-cage on the rotor.
Which of the following isn't a component of DC motor?
slip rings
What is an alternative to carbon brushes in an ac motor?
slip rings
What are tires?
Tires are the round inflatable rubber rings that are fitted around a vehicles wheels (rims) to make a smoother ride.
