Selection Table of Motor Power 

on Speed-torque Curves

• Information on this selection table is applicable to a standard motor (a low-voltage three-phase totally enclosed induction motor with a Class-E insulation), but NOT to those frequently started or operational at dynamic load, impact load and other conditions.
  
  
• Required motor power (KW) is calculated from the following formula:
  
  
  Required Load Torque 

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  Efficiency Rating 

   

• The efficiency rating applied in a 2-stage reducer is 95%; the applied efficiency rating for a 3-stage reducer is 92%.
  
  
• Required load torque is determined by its equivalent value when the motor runs at a fluctuating load; in case the duty cycle is uncertain, apply maximum value in required load torque.
  
  
• In general, start-up torque is not considered.
  
  

• Example of Motor Selection:

  For a motor model to be used with 60Hz power supply, a low-speed shaft with 60rpm and maximum load torque of 6 Kg/m,
  
  
  
  Then, required motor power of 0.4KW can be determined according to the value shown on the crossed point between the lines on Y (6.3Kg/m) and X (60rpm) axes.
  
  
  
  Based on the required power of 0.39KW, a suitable motor in this case is an 1/2 model.