m Efficiency Specifications

B. Results of CEEs Analysis of the Motors in DOEs



MotorMaster+ 4.0 Software

C. Comparing Efficiency Specifications

D. Historical overview



CEE PREMIUM-EFFICIENCY MOTORS INITIATIVE

GUIDANCE SPECFICATION FOR
LARGE (250-500 HP), LOW-VOLTAGE, GENERAL-PURPOSE MOTORS



1.
Introduction
This Guidance specification provides general performance and application information for
program administrators to consider when developing incentive programs for large (250-500 hp),
low-voltage, general-purpose motors
1
. The information is based on results of an analysis of the
motors listed in the U.S. Department of Energys MotorMaster+ database, discussions within the
CEE Motors & Motor Systems Committee and motor industry input.

The subject motors in this discussion are higher horsepower than those included in CEEs
Premium Efficiency Motor Specification
2
or in the EPAct 1992 legislation (see Product
Definition below)
3
. Because of their size, large motors are more expensive, consume more

1
Note: This Guidance Specification will become an integral part of CEEs Premium-Efficiency Motors Initiative. Integrating this document
into the overall initiative will require expanding the initiatives scope beyond the categories of motors covered by the EPAct 1992
legislation; revising the participation section; and clarifying that the technical considerations provided for large motors are applicable
to all motors with the degree of impact generally increasing as motor size increases.
2
CEEs Premium-Motor Specification and the federal EPAct 1992 legislation cover motors that fall within the following parameters: 1-200
hp, low-voltage, general-purpose motors. The NEMA Premium Specification includes these motor categories plus 1) motors from 250-
500 hp, 2) medium voltage motors and 3) special and definite purpose motors. CEEs Motors & Motor Systems Committee has been
considering whether to revise the CEE Specification to include one or more of these additional NEMA Premium categories. This
document addresses the first of these categories: 250-500 hp, low-voltage, general-purpose motors.
3
This document provides recommendations for 250-500 hp, low-voltage, general purpose motors. It is expected that CEEs Motors
& Motor Systems Committee will consider additional categories of motors at a future time.




Page 2 of 18
energy, and have a greater potential for energy savings than their smaller counterparts.
Correspondingly, duty cycle, loading factor, operating hours and other application parameters
have greater impact on overall efficiency and energy savings than for smaller motors. This
document is intended to clarify some of the performance issues affecting large, low-voltage,
general-purpose motors as well as to provide recommendations for program administrators to
consider when developing incentive programs for them. Please note that while these
considerations were developed for large industrial motors, the same considerations apply to
motors below the 250 hp level. And, as with smaller motors, not all applications benefit from the
installation of NEMA Premium motors.

2.
CEE Recommendation for Large, Low-Voltage, General-Purpose Motor Programs
Providing incentives for large motors is a voluntary component of CEEs Premium-Efficiency
Motors Initiative
; that is, organizations may participate in the initiative without adopting this
large motor component or may modify this component to suit their purposes. Alternately,
organizations may choose to adopt certain portions of the large motor component or address
large motors through a separate program. Requirements for participation in the Premium-
Efficiency Motor Initiative are defined in that document. CEE encourages participating programs
to adopt this component because of the energy savings potential with large motors and to provide
consistency of terms and definitions across organizational boundaries.

CEE encourages program administrators to consider providing incentives for 250-500 hp,
low-voltage, general-purpose motors that meet or exceed the NEMA Premium
TM
efficiency levels.
CEE recommends a custom approach to providing incentives for these motors.
CEE recommends that program administrators consider the motors operating and
application parameters, including but not limited to those listed in this document.

This recommendation strikes a balance between the energy savings opportunities for large
motors; their application-specific nature; and the value of leveraging the NEMA Premium brand
in the market.

Participation in this component of the initiative is consistent with participation in the initiative
overall. Specifically, participants includes.

3.
Product Definition
The motors covered by this Guidance Specification include: general-purpose, single-speed,
polyphase, 250-500 horsepower, 2,4, and 6 pole, squirrel cage induction motors, NEMA Design
A or B, continuous rated which meet or exceed the nominal energy efficiency levels presented in
NEMA Standards Publication MG1-2003, in Table 12-12 and as specified in Appendix A.

This range of motors differs from those covered by the NEMA Premium Specification in that
only low-voltage, general-purpose motors as defined in the EPAct 1992 legislation are included.
Medium voltage motors, and special and definite purpose motors, which are covered by the
NEMA Specification, are scheduled to be considered (in the order shown) in the 2007 work plan.






Page 3 of 18
4.
Potential Energy Savings for Large Motors
According to the Department of Energys 1998 United States Industrial Electric Motor Systems
Market Opportunities Assessment
4
,
industrial motor systems account for approximately twenty-
three per cent of all electricity consumed in the United States and that consumption could be
reduced by up to 18 per cent through the use of currently available products and practices. The
study goes on to state that while large industrial motors, i.e. those over 200 horsepower,
represent a small percentage of the overall industrial motor population, they represent a
significant amount of the overall energy consumed by the industrial motor systems. It provides
this supporting data:
Motors over 200 horsepower account for only one percent of the motors in the entire
manufacturing inventory, but use 45 percent of the energy use. By way of contrast,
motors in the 1-5 hp range account for 59 percent of the inventory but account for only 5
percent of the energy use.
Approximately 70% of motors which are >200 horsepower, fall into the 250-500 hp size
range.
Over 80% of the motors in this size range are pre-EPAct models.
Average annual motor system operating hours exceed 6,100 hours per year.

The 1998 DOE study estimates 24.6 billion kWh could be saved annually through motor
efficiency upgrades and best practice rewinding. If we use that estimate as a starting point and
then apply factors to reflect that 45% of the total motor system energy is consumed by motors
over 200 hp; and that 70% of the motors greater than 200 hp are between 250-500 hp, we
calculate potential estimated energy savings of more than 7.7 billion kWh annually
5
.

It should be noted that the DOE study was published in 1998. Whether the energy savings
opportunities it identifies remain relevant to the current market is a subject open for discussion.
Recent studies by individual CEE members as well as program experience assessing motor
opportunities at customer facilities have confirmed that the opportunities for energy savings
through the use of premium efficient motors and motor system optimization remains significant
in those regions. Based on this limited regional information and the fact that the 1998 study
remains the most comprehensive information available, this document includes the DOE data to
estimate the magnitude of the potential savings. The data is not intended to approximate actual
savings and program administrators are encouraged to consider the datas relevance in their
individual territories.

5.
Potential Market Implications
By participating in this component of the initiative, program administrators will help to draw
attention to the possible energy savings from the installation of large, low-voltage motors which
meet or exceed the NEMA Premium specification in appropriate applications. Consistent support
by programs across North America helps to condition the market for energy savings and increase
customer confidence in the savings potential of these products.

4
United States Industrial Motor Systems Market Opportunities Assessment
, prepared by Xenergy for the U.S. DOEs Office of Industrial
Technologies and Oak Ridge National Laboratory, 1998
5

(24.6 billion kWh projected total savings) x (45% of energy consumed by large motors) x (70% of large motor population is 250-500
hp) = 7.7 billion kWh. Note: For this simple calculation, the % of energy consumed by large motors is assumed to equal the % of
energy savings available from large motors.




Page 4 of 18
Using the words NEMA Premium to specify premium-efficient motors can serve to clear up
misperceptions in the market. Based on collective experience, there is a lack of awareness in t