ELECTRICAL DEPARTMENT NOTICE BOARD

GOVERNMENT ENGINEERING COLLEGE,BHARUCH

ELECTRICAL DEPARTMENT(8^TH SEM)  , EVEN TERM-2015-16                          SUB: EMD-II(180904)- LAB

Design problems

(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

NOTE : (1)Draw the parts of induction motor in sheet as per the dimensions calculated from the above                         problem.

                (2)Take one problem from above as per Batch A1-1,A2-2,A3-3,A4-4,B1-5,B2-6,B3-7,B4-8 & B5-9.