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We've got a bunch of lines running pumps and fans that need to ramp up and down smoothly, not just bang on or off, and the constant torque range form 5 to 50 Hz is basically what we're after for those conveyor drives, though the constant power stretch up to 100 Hz is a nice bonus for the occasional high-speed spindle job.
It's a three-phase asynchronous induction motor with a squirrel-cage rotor, which is pretty much the standard for this kind of variable frequency work, and the closed enclosure with IP55 protection means it'll handle the dust and washdowns on shop floor without us having to baby it.
The power range goes from 0.12 kW all the way up to 200 kW, so we can standardize on this one series for everything from small agitators to the big compressor, and the housing comes in either steel or alumnum depending on the weight and corrosion trade-off you want to make.
We're getting the foot-mounted IMB3 version, which is what most of our existing mounts are set up for, and the insulation class is F, so it can take a bit of thermal abuse from those frequent starts and stops without cooking the windings.
One thing that caught my eye is the pole count options from 2 to 10—it means our company can match the base speed to the load better than a generic 4-pole, and the efficiency class can be IE2, IE3, or even IE4 if the energy savings justify the premium, though for most of our stuff IE3 is the sweet spot.
Also, the rated current spans from 0.43 to 359 A, so we'll need to double-check the VFD sizing for the bigger units, but the direct online start method is fine for the smaller ones, and we usually have stock on teh common sizes, but confirm lead time on anything above 75 kW.
