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Slot design of induction motor
Flux/pole, Bav x DL/P, winding factor kw may be assumed.955 for full pitch distributed winding unless otherwise specified.
Hence conductors per stator slot Zss 6 Ts /.Minimum tooth width Flux per pole / (Max.Stator slots in Induction Motor: For smaller machines up to 20 kW, 600 V and diameter less than 40 cm, semi-closed slots are used.Resistance of stator winding: Resistance of the stator winding per phase is calculated using the formula (0.021 x l mt x Tph ) / as where l mt is in meter and as is in mm2.Wedge of suitable thickness (3.5 mm to 5 mm) is placed at the top of the slot to hold the coils in position.So selected number of slots should satisfy the consideration of stator slot pitch at the air gap surface, which should be between1.5.5.This depth of the stator core can be calculated by assuming suitable value for the flux density Bc in the stator core.Assume specific electric loading 25000, specific magnetic loading.46 Wb full load effeciency 86 power factor.87 calculate the following i) Stator core dimension D and L ii) Number of stator slots and winding turns.Solution:-, given, Po 30HP 30*.746kw eff.86.f.87 therefore input.V.A 30*.746.86*.87).92k.V.A, we also have ac 25000.Depth of the stator core can be calculated as follows.
For higher ratings, open type slots with insulation wedge are used.
In case of rectangular conductors width to thickness ratio must be between.5.5.
1,2, (p 1 ) or (p 2).Stator current per phase Is Q / (3Vph cos ).Based on the sectional area shape and size of the conductor can be decided.Standard bare size of round and rectangular conductors can be selected by referring the tables of conductors given in Design data Hand book.Length of the mean Turn: Length of the mean turn is calculated using an empirical formula l mt .3 p .24 where L is the gross length best casino bonus by odds of the stator and p is pole pitch in meter.