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AC Motors – RPM – Inverter Duty Vector Performance

Supplier: ABB Australia

When space is at a premium, the RPM AC induction motor is the answer. RPM AC induction motors pack maximum torque into a small space.

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Available in totally enclosed and drip-proof guarded designs, the RPM AC motor can be up to three frame sizes smaller than the traditional NEMA or IEC motor.

Leveraging our knowledge of variable speed DC motors the RPM AC motor combines square frame design, efficient cooling and premium insulation systems to provide ultimate torque performance in a compact package. 

  • The most compact and lowest weight designs for applications to 756kW. 
  • Vector performance – Continuous constant torque from zero speed to base speed (greater than 1000:1 turn down). 
  • 150% maximum overload torque from zero speed to base speed for 1 minute. 
  • High torque to inertia ratio – up to 80% less inertia than the corresponding standard NEMA frame motor. 
  • Capable of very high speeds due to compact low inertia designs. 
  • Class H insulation standard on most ratings. 
  • Surpasses NEMA MG-1 part 31 insulation system requirements for AF power. 
  • Positive Lubrication bearing system. 
  • Encoder mounting provisions. 
  • Thermal protection. 
  • Insulated ODE bearing on 440 frames. 
  • Numerous modifications available. 
  • Top or side mount blower construction. 
TEFC and Blower Cooled Designs 
For applications requiring totally enclosed protection, RPM AC motors are available in non-ventilated, fan cooled and in-line blower cooled construction. The totally enclosed family is designed with finned construction through the 250 frame to offer the industry's most efficient cooling and power density designs. The 210 and 250 laminated steel finned frame motors are an exclusive patent pending design offered only by Reliance Electric brand motors. 
Small compact power density design . 
  • Vector performance – Continuous constant torque from zero to base speed greater than 1000:1 turn down. 
  • 200% maximum overload torque from zero speed to base speed for 1 minute. 
  • 2:1 constant horsepower above base speed on most ratings. 
  • Capable of very high speeds due to compact low inertia designs. 
  • Class H insulation standard on most ratings. 
  • Surpasses NEMA MG-1 part 31 insulation system requirements for AF power. 
  • Positive Lubrication bearing system. 
  • Available in full IEC metric construction. 
  • Encoder mounting provisions. 
  • Thermal protection. 
  • Insulated ODE bearing on 440 frames. 

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