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129 slot 48 Pole combination in motor design?
Koil can make the synthesis (i.e. design the winding layout from slot-pole combination) only for symmetrical windings. To have a symmetrical 3-phase winding the back EMFs must be equal and out of phase of 120 electrical degrees. Looking at the star of slots, this means that the spokes in the star (or phasors, one for each slot) must be equally spaced and the number of spokes must be multiple of the phase number.
Considering this example, the machine periodicity t is computed as:
t= HCF{Q,p}=HCF{129,24}=3.
Then the number of spokes in the star of slot is Q/t=129/3=43.
In order to have a balanced winding (assuming m=3 as number of phases) Q/t must be divisible by 3. Such condition can be written in general as Q/(m t) integer.
In this case we have Q/(mt)=129/(3 3)= 129/9=14.333 which is not integer, so that the winding is not symmetrical as here described.
Maybe there are some different/non standard arrangement of the winding.
Considering this example, the machine periodicity t is computed as:
t= HCF{Q,p}=HCF{129,24}=3.
Then the number of spokes in the star of slot is Q/t=129/3=43.
In order to have a balanced winding (assuming m=3 as number of phases) Q/t must be divisible by 3. Such condition can be written in general as Q/(m t) integer.
In this case we have Q/(mt)=129/(3 3)= 129/9=14.333 which is not integer, so that the winding is not symmetrical as here described.
Maybe there are some different/non standard arrangement of the winding.
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In Discussion
How to solve Low efficiency at Light Loads in OFF GRID
Choosing Soft Starter or Variable Frequency Drive
High Permeability - High Saturation Material
Partial Discharge activity and humidity
What formula should be adopted in providing capacitors for an industry?
Wound Rotor Was Burned
Have you used digital controllers?
Do you need more than inlet pressure, head, and m3minute or gpm to size a pump?
Choosing Soft Starter or Variable Frequency Drive
High Permeability - High Saturation Material
Partial Discharge activity and humidity
What formula should be adopted in providing capacitors for an industry?
Wound Rotor Was Burned
Have you used digital controllers?
Do you need more than inlet pressure, head, and m3minute or gpm to size a pump?
