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The term "field scrap" on a packing slip refers to materials or products that are deemed unusable or defective and are designated for disposal or recycling. This designation typically indicates that the items did not meet quality standards or were damaged during handling or transit. Including "field scrap" on the packing slip helps ensure proper inventory management and accountability for these unusable items.
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What is mean by slip in an induction motor?
Slip (S): It is defined as the difference between the synchronous Speed [Ns] of the rotating stator field and the actual rotor speed [N] .Mathematically,%Slip (s) = [(Ns - N)/N] *100whereNs - N : Slip Speed.To note:When( i) Rotor is stationary ( i . e .) s=1At this condition Voltage induced in rotor conductors is maximum.(ii) rotor rotates @ Synchronous Speed ( i e ) Ns = NAt this condition Voltage induced in rotor conductors is zero.In an induction motor0.1% < s < 3% an essential need for a constant speed motor.Rotor resistance is independent of slip [S].
What will happen if slip rings are removed from a DC motor?
It won't work. The slip rings work in conjunction with the brushes to connect a rotating part of the unit with the stationary part. We need to couple current into and out of the rotor, and without the slip rings for the brushes to ride on, we can't do that, and the motor won't work.
What is meant by pole slipping?
A pole slip occurs when a motor or generator cannot maintain synchronicity. This occurs because the field excitation is too low.
What is the purpose of using slip rings?
This is the standard answer for both split ring commutator and slip ring. A split ring commutator is to reverse the current direction through an armature every half turn A slip ring is to ensure that the current continue to flow to the external circuit Last bit of additional information. Carbon brush ensure that the slip ring are in contact with the circuit containing the external load *Note: Do not get confused with split ring commutator(d.c.generator) & slip ring(a.c. generator)
What is difference between frequency and slip frequency?
Both 3-phase induction motors and single-phase induction motors have rotating magnetic fields assuming that the single-phase motor has one of the usual starting mechanisms built-in. The synchronous speed is given by RPM = 120 X f / p where f is the frequency and p is the number of poles. The conductors in the rotor pass through the magnetic field of the stator at the slip speed. As a result an alternating current is generated in the rotor. The frequency of that current is the rotor frequency or slip frequency given by slip frequency = slip speed X p / 120. At full load, the slip speed of a standard, 3-phase motor is about 1% to 2.5% of synchronous speed. A motor with 6% slip would be classified as a high-slip motor. The slip of a standard single-phase motor could be 6%.
