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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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  SUPPLY CONDITIONS : 

Voltage                                
Frequency        
Combined variation
Ambient                          
Duty                                
Insulation
Protection (Enclosure)  
Cooling                               

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:
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415 V ± 10%  
50 Hz ± 5% 
± 10%  
50 o C
S1  
Class “F”
IP 55
IC 0141

Effect of Voltage and Frequency Variation on the Characteristics of the Motor.  

A. C. Induction Motors  

Characteristics  

Voltage  

Frequency  

 

110%

90%

105%

95%

Torque*              Starting and
Maximum running

 
Increase 21%

 
Decrease 19%

 
Decrease 10%

 
Increase 11%

Speed ** Synchronous     
Full Load       Percent slip

 
No Change
Increase 1%
Decrease 17%

 
No Change
Decrease 1.5%  
Increase 23%

 
Increase 5%
Increase 5%
Little Change

 
Decrease5% Decrease5%
Little Change

Efficiency :
Full Load 
¾ Load
½ Load

 
Increase0.5to1%
Little Change  
Decrease 1 to 2%

 
Decrease 2%
Little Change
Increase 1 to 2%

 
Slight Increase
 -do-  
 -do


Slight Decrease
-do-
-do-

PowerFactor:
Full Load
¾ Load
½ Load

 
Decrease 3%
Decrease 4%
Decrease 5 to 6%

 
Increase 1%
Increase 2 to 3%
Increase 4 to 5%

 
-do-
-do-
-do-

 
-do-
-do-
-do-

Current :
Starting
Full Load  

 
Increase10 to12%
Decrease 7%  

 
Decrease10 to12% Increase 11%

 
Decrease 5 to6%
Slight Increase

 
Slight decrease
Slight Increase

Temperature rise

Decrease 3 to 4%

Increase 6 to 7%

-do-

-do-

Maximum overload capacity

Increase 21%

Decrease 19%

-do-

-do-

Magnetic noise

Slight Increase

Slight decrease

-do-

-do-

*The starting and maximum running torque of A.C. induction motors 
will vary as the square of the voltage.  
** The speed of A.C. induction motors will vary directly with the frequency.  

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Tel. : 020-4474303, 4473038, 24471586, 24475845.
Tel. Direct Mkt. : 020-24482491, 24473711, 24478581, 24470288.
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e-mail : iecmktg@vsnl.com
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