If you want to classify and compare motors, you must ensure that the data is specified for the same heating of the winding.
Heating of 100K (K=Kelvin) at the winding is standard. However, there are also other specifications, e.g., 120K.
In this case, the data is no longer truly comparable.
Drive hack:
When looking at data sheets, pay attention to the same heating of the winding (Delta K). First indication of differences: Iso H rating or Iso F rating
Digression: I even encountered this once in the food industry, where a motor was rated ISO H. -> Surface temperature requirement 60 °C!
This is what goes through my mind:
ISO H –> 180 degrees permissible at the winding, approx. 160 °C on the outside.
Significance of the data for the machine manufacturer = 0.
At least in this case, where the stored heating of the winding was also significantly higher than “usual.” The machine manufacturer has no idea how much torque the motor has at a winding temperature increase of 80K, for example.
It just looks “nice,” but in the end, it doesn’t benefit anyone.
But you still sometimes find yourself confronted with questions when you provide Delta 40K data (i.e., heating by 40°C) that matches the 60°C on the housing (at 40 degrees ambient temperature).
Another exciting topic—ambient temperature and drive ratings.😉
To be continued…