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May 22, 2007
Quality Motor Rewinding an Energy Efficiency Measure
Regional Technical Forum Submittal
In today’s energy climate motor service centers and their influence should not
be overlooked
In 1994, electric motor driven systems used 679 billion kWh or 23% of all
electricity sold in the U.S.
Many energy efficient motors are reaching the end of their life and will
need repair
It is time to address this issue
Without attention to controlled motor repair protocol expect
efficiency losses of:
• 1% if the motor is 40 HP or smaller;
• .05% if 50 HP or greater.
With Green Motors protocol expect no efficiency losses
Documents efficiency
unchanged even after
five rewinds
• Requires a controlled process;
• A failure event does NOT affect the motor core.
BUT
NEMA Premium® 5HP, 4 Pole, 3Ø, 89.5% Efficient Motor
100% Power 89.5% Out
Stator Res.
Rotor Res.
IronCore
Friction/Windage
StrayLosses Total
100%
10.5%
5%
.05%1.1%
10%20%
2.1%2.6%
25%
4.2%
40%
Percent ofInput
Percent ofLosses
New Motor losses—what can rewinding affect?
Green Motors Service Centers sign a commitment
to:
• Retain efficiency in the repair/rewind process;
• Base recommendations on total cost of ownership;
• Train personnel, allow GMPG inspection and review;
• Advise customers of catastrophic failures;
• Non-compliant service centers are removed.
HPAverage kWh
savedHP
Average kWh saved
1 16 60 856
1.5 25 75 1097
2 33 100 1456
3 48 125 1771
5 80 150 2116
7.5 146 200 2809
10 196 250 4136
15 291 300 4952
20 385 350 5732
25 573 400 6542
30 686 450 7349
40 909 500 8165
50 573
Deemed Savings Table
Based on conservative variables
HPBuy New Price
Rewind Existing
PriceSavings
15 $851 $598 $253
50 $2,289 $1,242 $1,047
100 $5,049 $2,021 $3,028
HP
An Average or “Good Enough” Rewind
Green Motors
Practices Rewind
Annual Savings with a Better
Rewind
15 $5,422 $5,304 $117
50 $17,662 $17,288 $374
100 $34,797 $34,250 $547
Energy Costs (based on $.05 Per kWh) Non-Energy Benefits
High quality motor repair estimated savings
NEMA Premium® and GMPG protocol is in the best interest of consumers, utilities, and motor service centers
Green Motors Practices
member locations
Widespread and growing
Green Motors Practices Logic Model
Sample Incentive Application(Runtime database)
Unique identifier (also appears on motor)
Consumer information
Quantifiable savings data
Test results report reinforces protocol
Third party oversight
• Retains efficiency;• Is cost effective;• Reaches even custom made motors;• Will lead to uniform utility programs;• Bolsters the bottom-line of commercial, agricultural, and the industrial community;• Is virtually “plug-and-play” and;
• Is an energy efficiency measure
The Green Motors Practices Group: