- Number Of Slots Per Pole Per Phase Formula Cost
- Number Of Slots Per Pole Per Phase Formula Sheet
- Number Of Slots Per Pole Per Phase Formula Calculator
In Emetor, a winding is called fractional-slot winding when the number of slots per pole per phase is fractional and superior to 1.
Number Of Slots Per Pole Per Phase Formula Cost
In the Emetor winding calculator, fractional slot windings with a number of slots per pole per phase strictly superior to 1 are indicated with orange cells. In Emetor, only fractional slot windings with a number of layers equal to two are represented. Below is the example of the layout of a 2-pole 9-slot fractional slot winding which has a number of slots per pole per phase equal to 1.5:
For the same slot number N s, the larger pole number, the smaller the widths of the inner and outer stator teeth, and the larger slot area as well as the larger turns per slot. Thus, the fundamental EMF amplitude of type A, C and E ( p = N s /2-1) are less than those of type B, D and F ( p = N s /2+1) and the difference will become smaller. EASA does list 72 slots as a valid combination for 2-pole machines (geared toward rewind) in the EASA Tech Manual table on coil grouping. It has annotation '6 groups of 12', '12 12 12', '1, 2, cir'. I know what the '6 groups of 12' means.
| A | c | c | B | a | a | C | b | b | ||||||||||||||||||
| A | A | c | B | B | a | C | C | b |
Fig. 1 Double-layer 2-pole 9-slot fractional slot winding with a winding factor of 0.945.
Concentrated windings are also fractional slot windings, but they have a number of slots per pole per phase strictly inferior to 1.
Number Of Slots Per Pole Per Phase Formula Sheet
Number Of Slots Per Pole Per Phase Formula Calculator
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