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In single-phase induction motor ┬╖ Which winding is mostly used winding?
concentric winding
progressive winding
skein winding
circular winding
concentric winding
Concentric winding is the most widely used winding configuration in single-phase induction motors due to its manufacturing simplicity and lower slot space requirement ┬╖ In this configuration, coils of different pitches are placed within the same slots, forming a concentric arrangement that simplifies the winding insertion process.
Concentric winding is the most widely used winding configuration in single-phase induction motors due to its manufacturing simplicity and lower slot space requirement ┬╖ In this configuration, coils of different pitches are placed within the same slots, forming a concentric arrangement that simplifies the winding insertion process.
MMFтИЭNтЛЕI тАФ Fundamental relationship where MMF is proportional to turns and current
KwтАЛ=KpтАЛтЛЕKdтАЛ тАФ Winding factor where KpтАЛ is pitch factor and KdтАЛ is distribution factor
The concentric winding is designed to approximate a sinusoidal distribution of MMF (Magnetomotive Force) by adjusting the number of turns in each concentric coil ┬╖ By placing smaller coils inside larger ones, the total volume of copper is optimized, and the end-turn extensions are minimized, which reduces leakage reactance and improves machine performance.
Concentric windings use coils of different sizes but share the same polar group axis.
It requires fewer coil groups compared to lap or wave windings, reducing connections.
It is ideal for fractional slot windings and small fractional horsepower motors.
The coil end-turns are shaped to overlap with minimal axial space.
Reduced number of end connections
Ease of insertion into stator slots
Optimized copper utilization for small motors
Better cooling due to lower end-turn density
Higher leakage reactance in some configurations
Unequal coil lengths lead to varying resistance per coil
Not suitable for large high-power machines
Ceiling fans and pedestal fans
Washing machine motors
Small centrifugal pumps
Refrigerator compressors
In small motors, concentric windings are typically hand-wound or machine-inserted using a 'form-wound' process.
Option B (progressive) refers to wave winding patterns, Option C (skein) refers to a specific winding method using a single continuous wire loop, and Option D (circular) is not a standard industry terminology for induction motor stator winding.
A is correct тАФ Concentric winding is the standard choice for single-phase induction motors due to its manufacturing efficiency and compact end-turn design.
Always remember that in small single-phase machines, cost-effectiveness and manufacturing simplicity (like concentric windings) take precedence over the high-efficiency high-complexity windings used in large 3-phase machines.