An efficiency rule was issued by the US Department of Energy on March 9, 2010, covering 1/3- through 3-HP Open Drip-Proof general-purpose single and three-phase motors with two-digit NEMA frames (and equivalent IEC frames). Minimum average efficiency levels were issued for single-phase capacitor start, induction run and capacitor start, capacitor run designs, and three-phase induction two-, four-, and six-pole AC motors.
NEMA has written a guide to the Small Motor Rule. The organization received comments from the DOE stating that it doesn't agree with NEMA’s interpretation of the rule. We are awaiting clarification on these comments.
The Small Motor Rule will set fairly high efficiency levels for motors that are currently unregulated in the US. The physical size of redesigned compliant open motors may change, particularly on single-phase designs where much larger capacitor housings may be used on higher output ratings. OEMs may require redesign of their equipment to accommodate these new designs and they should check with their motor supplier soon. Manufacturers importing machinery that includes small motors embedded must also comply with the new rule.
Another new DOE Rule is expected in May of this year covering 1-HP to 500-HP three-phase motors. This comprehensive rule will be discussed in future blogs.
John Malinowski is the general product manager for general-purpose and severe duty AC motors at Baldor Electric Company.
The motor industry has operated with DOE efficiency regulations since 1997. A new rule is expected to roll out in May of this year to close some loopholes on regulation for 1-500 HP three phase motors as NEMA and energy advocates collaborated on a petition that DOE adopted. Although the small motor rule is not perfect, a dialog is happening to clear up things. It is important to have these reglations with clear definitions to aid with adoption and enforcement. Remember that these rules include motors mounted to equipment imported for use in the U.S.
Iterative design — the cycle of prototyping, testing, analyzing, and refining a product — existed long before additive manufacturing, but it has never been as efficient and approachable as it is today with 3D printing.
People usually think of a time constant as the time it takes a first order system to change 63% of the way to the steady state value in response to a step change in the input -- it’s basically a measure of the responsiveness of the system. This is true, but in reality, time constants are often not constant. They can change just like system gains change as the environment or the geometry of the system changes.
At its core, sound is a relatively simple natural phenomenon caused by pressure pulsations or vibrations propagating through various mediums in the world around us. Studies have shown that the complete absence of sound can drive a person insane, causing them to experience hallucinations. Likewise, loud and overwhelming sound can have the same effect. This especially holds true in manufacturing and plant environments where loud noises are the norm.
The tech industry is no stranger to crowdsourcing funding for new projects, and the team at element14 are no strangers to crowdsourcing ideas for new projects through its design competitions. But what about crowdsourcing new components?
It has been common wisdom of late that anything you needed to manufacture could be made more cost-effectively on foreign shores. Following World War II, the label “Made in Japan” was as ubiquitous as is the “Made in China” version today and often had very similar -- not always positive -- connotations. Along the way, Korea, Indonesia, Malaysia, and other Pacific-rim nations have each had their turn at being the preferred low-cost alternative to manufacturing here in the US.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.