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VEM IE3-W41R90SY4 – a three-phase motor in efficiency class IE3 rated at 1 kilowatt from the German manufacturer, fitted to pumps and fans
VEM is a German manufacturer of industrial low-voltage and medium-voltage motors, with production in Saxony and Saxony-Anhalt. The type described here, from the W41 range, is among the smaller versions in the line, used for pumps, fans and simple drive tasks.
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The motor is assigned to efficiency class IE3 and rated at 1 kilowatt, an output sufficient for small pumps, fans or stirrers. Under IEC 60034-30-1, IE3 denotes the premium efficiency class, ahead of the older IE1 and IE2 classes in terms of losses in the winding and iron core.
Under IEC 60072 the frame size sets the shaft centre height and therefore the foot and flange dimensions, so that motors of the same frame size from different makers stay mechanically interchangeable. The squirrel-cage rotor is standard in industrial motors of this kind, while slip-ring rotors are reserved for high starting torque. Protection ratings follow IEC 60529, mounting arrangements IEC 60034-7, for example IM B3, IM B5 or a vertical V1 version. Running it from a frequency inverter raises the demands on winding insulation.
Before buying, check the rating plate and whether voltage and frequency match the intended supply. Turned by hand, the shaft should run freely and quietly; rattling or catching points to worn bearings. The terminal box and cabling deserve a look for corrosion or cracked insulation, which an insulation test clarifies.
Sources: SpecCodex-Register: Kennwerte des Modells IE3-W41R90SY4
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