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T.E.F.C. Squirrel Cage  | Crane Duty Motors | Flame Proof Squirrel Cage 

 T.E.F.C. SQUIRREL CAGE A.C. INDUCTION MOTORS 

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RESULTS OF NO LOAD TESTS CONDUCTED ON INDUCTION MOTORS 
UNDER BALANCED AND UNBALANCED VOLTAGE CONDITIONS

  KW/HP

Pole

V1

V2

V3

%unbalanced
Voltage

A1

A2

A3

%unbalanced
Current
 30/40  4  420  420  420  ----  13.5  12.8  12.75  3.72
 30/40  4  420  416  422  0.72  15.5  12.0  11.00  21.00
 15/20  4  440  440  440  ----  11.25  11.5  11.38  1.14
 15/20  4  440  418  418  3.52  13.70  5.75  12.35  45.50
 11/15  4  414  414  414  ----  8.6  8.1  8.25  3.42
 11/15  4  414  414  396  2.95  10.65  7.4  6.50  30.42
 150/200  8  425  425  425  ----  69.60  69.60  70.8  1.2
 150/200  8  423  426  426  0.47  67.2  68.4  74.4  6.35
 110/150  4  424  424  424  ----  49.2  49.2  49.8  0.85
 110/150  4  426  427  423  0.14  55.8  49.8  43.8  12.00
 100/135  4  420  420  420  ----  25.8  25.2  25.2  1.65
 100/135  4  427  431  430  0.465  24.0  26.4  30.6  13.2

INSULATION :

All motors are insulated with class ‘F’ insulation system. Class ‘F’ allows temperature rise of 105 K (By the resistance variation method ) over 50oC ambient temperature and maximum temperature of 155o C at the hot spots.

Insulation Class  

Temperature Rise

      Max. Temp. At Hot Spots

  CLASS ‘F’

105 K  

        155 o C  

Note : For all Class ‘F’ Insulation motors Temp. rise is limited to Class ‘B’ i.e. 70o C over and ambient temp of 50o C.  
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The Indian Electric Co. 
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e-mail : iecmktg@vsnl.com
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