# Electrical Machines , Vol. 2 by Ivanov - Smolensky By Ivanov - Smolensky

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Additional resources for Electrical Machines , Vol. 2

Sample text

35). ,l2 ,..... lJ2 r-J A2/l where a is the coefficient of heat transfer (see Chap . 35). 1 to 2 X 10" Am-I) . From past experience, the electric loading should preferably be chosen such that the total t emperature rise (finalized by thermal an alysis and equal to e Ins ul e a in the case of indirect cooling and to e a ill th e case of direct cooling) does not exceed the temperature limit for the class of insulation used . As is seen from Eq . n- and the electric loading, A . Obviously, the size, mass and cos t of a machine can be minimized by ma ximizing the gap density and the electr ic loading.

38 Gener al Outline raLings, ar e usnall y listed all the nameplate of the machine. They are:mechanical power, PH = P2 ,n supply frequency, 11 line stator voltage, VI, lin e line stator current, II, line rotor rpm, nR power factor, cos (PI , R efficiency, lJR. If the stator has a three-phase winding with the start and finish of each phase brought out , and the winding may he star- or delta-connected, the nameplate gives the currents and voltages for all the likely connections (a star or a delta) as a fraction, VlIn e , ylV lIne , li and I u ne , y lI u ne , s For a slip-ring motor, the nameplate also gives the lockedrotor voltage, with the slip-rings open-circuited and the line rotor current at its rated value.

L , where l is the base (or ref erence) dimension of the machin e. c. suppl y. - Tr anslator' s note. -ch, 37 size I1TI(I 51 Performan ce The temperature rise of the armature insulation is proportional to the sq uare of the electric loading e Ins u l ,..... /A,lnSU! l2 ,..... l2J2 ,..... A 2 where 0IUSll! l is the insulation thickness, and A,lusn! is th e thermal conductivity of the insulation (see Chap. 35). ,l2 ,..... lJ2 r-J A2/l where a is the coefficient of heat transfer (see Chap . 35).