What means of Inverter-Ready and Inverter-Duty motors?
INVERTER-READY means that some of the extras required to protect the machine from the damaging effects of the AC drive output waveform are included. Typically, this means beefed up insulation on the winding and (usually) a choice of a certain pitch to help damp out prevalent harmonics. It may or may not include skewing of the rotor winding vs the stator winding. It would also include insulation of the non-drive bearing - but possibly not both bearings. The intent of an inverter-ready design is to start / run at a single speed (drive output frequency either 50 or 60 Hz, so machine runs at/near normal synchronism) on the drive. More winding cross-section is used, to help deal with the added heat from those current harmonics which squeak through.
INVERTER-DUTY (also sometimes listed as "inverter ready") means even more extras are built in. All the inverter-ready items are there, plus: insulation of variable frequency drive end bearing (if not already included) and the addition of a shaft grounding method to drain any voltage / current buildup and provide a safe working environment. These may well include a separately-powered fan, to aid in ventilation when operating at load with the speed significantly below synchronism. The inverter-duty machine can be operated continuously at any load / speed combination within its nameplate rating.
INVERTER-DUTY (also sometimes listed as "inverter ready") means even more extras are built in. All the inverter-ready items are there, plus: insulation of variable frequency drive end bearing (if not already included) and the addition of a shaft grounding method to drain any voltage / current buildup and provide a safe working environment. These may well include a separately-powered fan, to aid in ventilation when operating at load with the speed significantly below synchronism. The inverter-duty machine can be operated continuously at any load / speed combination within its nameplate rating.
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