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Electric motors speed - Poles D10.2                                                                              Mobile  
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  Speed rpm     Speed  
  n° poli  50 Hz  60 Hz 100 Hz   The speed of an AC three-phase asynchronous motor is directly correlated to the frequency of the power supply and the number of poles:  
  2 3.000 3.600 6.000    
  4 1.500 1.800 3.000      
  6 1.000 1.200 2.000   ns = (2 x f x 60) / p  
  8 750 900 1.500      
  10 600 720 1.200   where:  
  12 500 600 1.000   ns = synchronous speed  
  16 375 450 750   f = network frequency  
  20 300 360 600   p = Number of poles (2 each polar pair)  
  24 250 300 500   The rotational speeds under load of the asynchronous motors are slightly lower than the synchronism speed indicated in the table, due to the sliding which is always less than 1. For this a 4-pole 50 Hz motor will never make 1.500 rpm but about 1.450.  
  32 187,5 225 375    
  48 125 150 250    
  (The values in this table are theoretical)    
           
Electric motors speed - Poles D10.2                                                                              Desktop  
Free technical programs - Visit the Homepage  
  Speed rpm     Speed  
  n° poli  50 Hz  60 Hz 100 Hz   The speed of an AC three-phase asynchronous motor is directly correlated to the frequency of the power supply and the number of poles:  
  2 3.000 3.600 6.000    
  4 1.500 1.800 3.000      
  6 1.000 1.200 2.000   ns = (2 x f x 60) / p  
  8 750 900 1.500      
  10 600 720 1.200   where:  
  12 500 600 1.000   ns = synchronous speed  
  16 375 450 750   f = network frequency  
  20 300 360 600   p = Number of poles (2 each polar pair)  
  24 250 300 500   The rotational speeds under load of the asynchronous motors are slightly lower than the synchronism speed indicated in the table, due to the sliding which is always less than 1. For this a 4-pole 50 Hz motor will never make 1.500 rpm but about 1.450.  
  32 187,5 225 375    
  48 125 150 250    
  (The values in this table are theoretical)