Introduction to Electrical Machines by A. R. Daniels (auth.)

By A. R. Daniels (auth.)

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By A. R. Daniels (auth.)

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Where 90 - A. ). 45) Then the electromagnetic torque produced by the machine is given by pg pPg W 2 W8 t =- = -e PRODUCTION OF TORQUE so that 41 = ~ kw(Nalma)(Cl>m) cos wst sin (wst te - A). l 0 Hp- = -gp - F1 where d is the mean diameter at the air-gap, I is the length of core, and g is the air-gap length. lo2dl kwF1F2 2 gp /e = - - - /e . lodl kw -F1F2 [ . =g 2- SID (2W 5/ A) - - A) - . AJ. 47) The average value Te is given by _ _ J1. 0 dlk F1F2 . g Te- The field flux density Bm is given by Bm Te = - 2 w = SID , A.

T)kw where N 3 is the effective number of armature turns in series and kw is the winding factor. The armature current ia can be written i3 = Im. ) where 90 - A. ). 45) Then the electromagnetic torque produced by the machine is given by pg pPg W 2 W8 t =- = -e PRODUCTION OF TORQUE so that 41 = ~ kw(Nalma)(Cl>m) cos wst sin (wst te - A). l 0 Hp- = -gp - F1 where d is the mean diameter at the air-gap, I is the length of core, and g is the air-gap length. lo2dl kwF1F2 2 gp /e = - - - /e . lodl kw -F1F2 [ .

A developed sectional diagram for a 12 slot, 1 A -B 2 3 A A -B -C 4 A 5 B 6 B -C -C -C 7 8 B B -A 9 c 10 c 11 c -A -A -A -B Fig. 2(b) 3-phase, 12fr spread winding. C -B ,-(\ B 2-pole arrangement with a coil pitch of 6 slots (180° = slots 1-7) connected in each of the above forms is shown in Fig. 2 and it is apparent that the 3-phase, 60° spread form of connection illustrated in Fig. 2(a) will produce a sequence of ACBACB in the phase belts of the winding for a phase sequence 22 ARMATURE WINDING ARRANGEMENTS ABC.

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