<-- Back Items 12 - 17
Item 18. Slot pitch, l
Use:
Use:
Use: l = t / (S/p)
Round-off to three decimal places.
Item 19. Number of Conductor per slots, Cs
Use:
Cstrial = qtrial × l / Ic.
Csfinal is a whole number of Cstrial.
Solve for the equivalent specific loading, qfinal, using the Csfinal.
Item 20. Stator Conductor in Series per phase, Z
Use:
Z = p ×
ns × Cs.
Should be a whole number based on the most appropriate combination of Slots per Pole per Phase: ns and Number of Conductors per slot: Cs.
Item 21. Air Gap Flux per pole (open circuit), FNL
Use:
FNL = Vt × 108 /
× 2.22 × d × f × Z .
Rounded to nearest 10,000 maxwells.
Finalize B"gave and B"gmax in Item 06
Item 22. Maximum Apparent Tooth Flux Density , B"t
Use:
B"ttrial = 85,000 lines/sq.in.
Use:
B"tfinal = B"ttrial × [ t / tend ]
For 60-hz machines, between 75,000 to 105,000 lines per sq. in..
Rounded-off to nearest 1,000.
Use:
B"t1/3 = B"tfinal × [ tend / t1/3 ]
Item 23. Tooth Dimensions
Use:
ttrial = l / 2 + 0.027.
This item SHOULD serve only as a guide.
Item 23a. Permissible Tooth Width, t
Use:
t = B"gmax × l × la / ( B"ttrial × ln ).
Other values of tooth widths should not exceed this value.
Item 23b. Narrow End Tooth Width, tend
Use:
tend = t - 0.025
Rounded to the nearest two decimals.
Item 23c. Tooth Width at Top, Near Air Gap, ttop
Use:
ttop = [( pD - s ) / SA ] - s
Where s = slot width
SA = Number of Armature
Rounded to the nearest three decimals.
Item 23d. Tooth Width at Root, troot
Use:
troot = [ p (Do - 2Rdfinal ) / SA ] - s
Where s = slot width
SA = Number of Armature
Rounded to the nearest three decimals.
Item 23e. Average Tooth Width, tave, tmid
Use:
tave = ½ (ttop + troot )
Rounded to the nearest three decimals.
Item 23f. Tooth Width at 1/3 of Slot Depth from Root, t1/3
Use:
t1/3 = tend + 1/3 (troot - tend )
Rounded to the nearest three decimals.
Items 24 - 32
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