ELECTRICAL DEPARTMENT NOTICE BOARD

Laboratory Assignments

Semester : 7^TH Electrical

Subject: Design of AC Machines (2170909)

Draw & write the following Assignments from the book “ELECTRICAL MACHINE DESIGN “ by   A. K. Sawhney

SHEET NO. 1

Draw the following parts of three phase induction motor in SHEETS

10.3,10.7,10.10,10.14,10.15,10.16,10.27,10.36,10.41,10.43

SHEET NO. 2

Draw the following parts of three phase synchronous machine in SHEETS

12.2,12.3,12.4,12.8,12.9,12.10,12.13,12.14,12.15,12.16,12.17,12.18

SHEET NO. 3

Draw the ROTOR & STATOR of induction machines in sheet as per the dimensions calculated from the problem no. 1

SHEET NO. 4

Draw the ROTOR & STATOR of synchronous machines in sheet as per the dimensions calculated from the problem no. 2

SHEET NO. 5

 Draw the circle diagram for 5HP, 200V, 50Hz, 3-ɸ, 4-pole, star connected induction motor from the following data: Also calculate power factor, F.L. current, % slip, Efficiency, Max. Torque, Max. Output etc.

O.C. Test	200V	5A	350W
S.C. Test	100V	26A	1700W

Write the following solved examples from the book “ELECTRICAL MACHINE DESIGN “ by   A. K. Sawhney in file page with data sheet

(1)Design problem-1

Design a 2.2KW, 400V, 3-ɸ, 50Hz, 1500rpm squirrel cage induction motor. The machine is to be started with star-delta starter; the efficiency & power factor are 0.8 & 0.825 respectively. Assume cheap design.

(2)Design problem-2

Design a water wheel generator with the following specifications:

KVA=3000, Phase=3, Voltage=6600V, Frequency=50Hz, Connection=star, RPM=187.5,  P.F.=0.8lag

Design problems

NOTE : (1) Solve the following problems as per solution of  above Design

                          problem no 1. Given in A. K. Sawhney book

       (2)Problem distribution as per Batch…. Like, A1-1, A2-2, A3-3, A4-4,

 A5-5, B1-6, B2-7, B3-8, B4-9 & B5-10

                   

(1)    Design a 5HP, 440v, 50Hz, 1500rpm, 3-ф squirrel cage induction motor. Assume that: specific magnetic loading=0.46wb/m2, specific electric loading=22000ac/m, Efficiency=83%, power factor=0.84, stator winding factor=0.955. Suggest for cheap design.

(2)    Design a 30HP, 440V, 50Hz, 1000rpm,3-ф squirrel cage induction motor. Assume that: specific magnetic loading=0.45wb/m2, specific electric loading=25000ac/m, Efficiency=86%, power factor=0.87, stator winding factor=0.955. Suggest for overall good design.

(3)    Design a 10HP, 440V, 3-Phase, 4-pole, 50Hz squirrel cage induction motor which is to be started using a star-delta starter. Assume:-Average flux density in the gap=0.45wb/m2, Ampere conductors per meter=23000, efficiency=0.85, Power factor=0.84, stator winding factor=0.955. Choose the main dimension to give an overall good design.

(4)    Design a 5HP, 440v, 50Hz, 1500rpm, 3-ф squirrel cage induction motor. Assume that: specific magnetic loading=0.44wb/m2, specific electric loading=24000ac/m, Efficiency=83%, power factor=0.84, stator winding factor=0.955. Suggest for cheap design.

(5)    Design a 15HP, 440V, 3-Phase, 4-pole, 50Hz squirrel cage induction motor which is to be started using a star-delta starter. Assume:-Average flux density in the gap=0.42wb/m2, Ampere conductors per meter=26000, efficiency=0.84, Power factor=0.84, stator winding factor=0.955. Choose the main dimension for good power factor.

(6)    Design a 20HP, 440V, 3-Phase, 6-pole, 50Hz squirrel cage induction motor which is to be started using a star-delta starter. Assume:-Average flux density in the gap=0.42wb/m2, Ampere conductors per meter=26000, efficiency=0.87, Power factor=0.86, stator winding factor=0.955. Choose the main dimension for good Efficiency.

(7)    Design a 15HP, 440v, 50Hz, 1500rpm, 3-ф squirrel cage induction motor. Assume that: specific magnetic loading=0.44wb/m2, specific electric loading=24000ac/m, Efficiency=83%, power factor=0.84, stator winding factor=0.955. Suggest for cheap design.

(8)    Design a 10HP, 440V, 3-Phase, 4-pole, 50Hz squirrel cage induction motor which is to be started using a star-delta starter. Assume:-Average flux density in the gap=0.42wb/m2, Ampere conductors per meter=26000, efficiency=0.84, Power factor=0.84, stator winding factor=0.955. Choose the main dimension for good power factor.

(9)    Design a 30HP, 440V, 3-Phase, 4-pole, 50Hz squirrel cage induction motor which is to be started using a star-delta starter. Assume:-Average flux density in the gap=0.41wb/m2, Ampere conductors per meter=23000, efficiency=0.85, Power factor=0.84, stator winding factor=0.955. Choose the main dimension to give an overall good design

(10)Design a 20HP, 440V, 3-Phase, 6-pole, 50Hz squirrel cage induction motor which is to be started using a star-delta starter. Assume:-Average flux density in the gap=0.42wb/m2, Ampere conductors per meter=25000, efficiency=0.88, Power factor=0.86, stator winding factor=0.955. Choose the main dimension for good Efficiency.