YVFE4 355L-2/4/6/8/10 IE4 VF 3-Phase Asynchronous Motor

YVFE4 series motor complies with the IEC standard. This standard provides for the global harmonization of energy-efficiency classes of electric motors. It deal with all kinds of electric motors that are rated for line operation (including starting at reduced voltage). This includes all single- and three-phase low voltage induction motors, regardless of their rated voltage and frequency, as well as line-start permanent-magnet motors. For a given power and frame size, it is generally easier to achieve a higher motor efficiency when the motor is designed for and operated directly on-line with a 60 HZ supply frequency rather than on 50HZ.

It is not expected that all manufacturers will produce motors for all efficiency classes not all ratings of a given class. Users should select the efficiency class in accordance with a given application depending on the actual operating hours. It may not be energy efficient to select motors of a high efficiency class for intermittent or short time duty due to increased inertia and start-up losses.