In an ongoing effort to reduce energy consumption, greenhouse gas emissions and energy costs, the United States Department of Energy (DOE) is implementing two new motor efficiency and test rules and proposing a third that broadly impact motors from .25 horsepower (hp) to 750 hp.
Those who do not live and breathe DOE regulations as part of their daily jobs may find it challenging to understand the nuances of the DOE’s new electric motor rules and which of their motors are covered in each category. 25 Hp 3 Phase Motor
This article provides a high-level summary of each of the new rules, as well as their implementation dates, so users are aware of what lies ahead and can begin planning now for the changes.
Following a six-month extension, requested by motor manufacturers, to its original implementation date, the DOE’s updated test rule for electric motors took effect in October 2023.
The DOE’s updated medium electric motor (MEM) rule expands the types and sizes of motors that must comply with NEMA Premium and Super Premium efficiency standards, which formerly affected only 1 hp to 500 hp three-phase motors.
Implemented by the DOE as a direct final rule in June 2023, the updated MEM rule was created based on recommendations from the Motor Coalition, a group consisting of NEMA and a consortium of utility, energy efficiency and environmental organizations. When it takes effect in June 2027, new requirements for motors that must comply with MEM rule standards include:
In November 2023, the DOE issued a notice of a proposed rule (NOPR) that aims to prescribe energy conservation standards for expanded scope electric motors (ESEM), a subset of motors used in various commercial and industrial equipment. The primary motors covered by this rule are single-phase and three-phase motors rated .25 hp to 3 hp.
Like the MEM rule, the proposed ESEM rule is based, in large part, on recommendations made to the DOE by the Motor Coalition. The comment period for this rule has ended, and the proposed implementation date for the new rule is January 2029.
OEMS and end users seeking a more detailed understanding of how these changing rules will impact their motor fleet should consult their motor manufacturer. The sooner users understand the implications of the rules, the better prepared they can be for the changes that are already here and those that are coming in the years ahead.
3 Phase Delta Motor Tim Albers is senior director of product management for Nidec Motor Corporation/U.S. Motors. For more information, visit www.nidec.com.