Electric Motors

On shop.atti.it, ATTI offers over 500 three-phase and single-phase asynchronous electric motors, in the most common IEC sizes, with construction forms B3 (foot-mounted), B5 (flange-mounted), and B14 (small flange) and in various pole configurations, as well as in efficiency classes IE2 and IE3. Self-braking versions and stepper motors are also available. The motors can be matched with the gearboxes in the catalog via the IEC motor connection (PAM).

The IEC size indicates the shaft height of the electric motor, expressed in millimeters, which is the distance between the center of the shaft and the base plane of the feet.

For example, a motor of IEC size 71 has a shaft height of 71 mm. Each size corresponds to standardized dimensions of the shaft and flanges: for instance, a size 71 generally requires a 14 mm shaft and a B5 flange of 160 mm.

Thanks to this standardization, IEC motors from different brands, with the same size and construction configuration, are generally interchangeable and can be mounted on the same gearboxes, except for special executions.

To choose a three-phase asynchronous motor, you need: the power required by the machine in kW, the speed, which depends on the number of poles (with a supply of 50 Hz approximately 2,800 rpm at 2 poles, 1,400 at 4 poles, 900 at 6 poles), the construction type (B3, B5, or B14) based on how it needs to be mounted, the supply voltage, and the required efficiency class. If the motor is to be connected to a gearbox, the IEC size and shape must match the motor attachment of the gearbox.