Varying standards across different regions challenge suppliers' technological capabilities
Judging from past export experience, Wu pointed out each country has different regulations about motors. To provide IE3 premium-efficiency motors compliant with vastly different requirements around the world is a challenge to suppliers' capabilities in terms of finding a balance among production, design and materials.
Take the U.S. for example. Although it leads the world in high-efficiency motor implementation schedule, the NEMA standard has no limitation on motor frame sizes. That is, the horsepower rating and number of poles is not strictly related to the frame size, so suppliers have more flexibility in production and can meet the high-efficiency requirements by properly elongating iron cores and adding copper conductors.
However, Japan's JIS and Taiwan's CNS standards previously set a direct bond between the horsepower rating and number of poles and the frame size. In other words, a certain rating and number of poles had to correspond to a fixed frame size, meaning the external mounting dimensions were fixed. These standards have been long adopted and followed by users in the regions. As a result, when the new IE2 or IE3 standard replaces older specifications, new motors, despite their higher efficiency, still have to follow old requirements on external dimensions for customer substitution convenience. Furthermore, Japan has a demand to satisfy different voltage and frequency application (200V/220V, 50Hz/60Hz), posing additional difficulty for motors to meet the IE3 standard. As such, more sophisticated technologies, other than just adding copper conductors and elongating iron cores, are needed to overcome these limitations. Therefore, to produce IE3 premium-efficiency motors meeting Japan and Taiwan requirements is a challenge in terms of both costs and technology, indicated Wu.