FUKUTA ELEC. & MACH. CO, LTD.

As industrial automation, smart manufacturing, and electric mobility continue to develop, motors are no longer just components that provide rotational power.

When comparing IE3 and IE4 motors, consider not only the efficiency class but also actual operating conditions and long-term total cost of ownership. If the load varies significantly, the motor, variable frequency drive (VFD), and control strategy should be evaluated together.

“Induction” and “synchronous” describe how a motor operates, while “servo” emphasizes feedback and precise motion control. Synchronous motors can also be used in servo systems. Start by defining the control goal, then compare efficiency, cost, and load conditions.