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Inverter Duty Motors

Inverter Duty Motors
Inverter Duty Motors
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Product Code : 763412
Product Description
Inverter Duty motors


The use of frequency inverter enables a continuous control of the motor speed and provides constant torque in the whole speed range.

The rating for variable speed induction motors need to be selected based on the following aspects:

  • Heating due to harmonic content of inverter waveform.
  • Reduced ventilation due to low speed operation.
  • Constant torque/Constant Power/ Variable torque requirement of load.
  • Other limiting factors e.g.  maximum permissible motor speed, ambient temperature, altitude etc.

While variable speed drives provide highest energy saving for variable torque (Centrifugal pump, fan) applications, for constant torque and constant power application, Variable speed drives offer significant process control improvements. Basic inverters permit operation over a typical 20:1 speed range. With closed loop vector control the effective range may be increased to 1000:1.

The main International Standards that deal with this subject are:

  • IEC: 60034-17 - Rotating Electrical Machines - Part 17: Cage induction motors when fed from converters.

  • IEC 60034-25 - Rotating Electrical Machines - Part 25: Guide for the design and performance of cage induction motors specifically designed for converter supply

Main Features of inverter duty motor:

  • Inverter Friendly Insulation (Dual-coated class-H wires, special impregnation process & high quality of flat insulations. Normally class F & if require class H)
  • Insulated Bearing at NDE (Generally For Higher Frame Size)
  • Thermal overload protection
  • Precision dynamic balanced rotor assembly
  • Provisions for encoder mounting
  • Forced Cooling if required
  • Customization for Special Performance Requirements


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