PRESENTED BY Toshiba International: Mike Tharp Hupp Electric Motors: Dave Patterson
What are we going to talk about today? • Do you know how much Electric Motors Cost you? • Why is improving Motor Efficiency Important? • When is an Energy Efficient Motor Cost Effective? • How to size an Energy Efficient Motor? • Should I rewind a failed Motor? • How to begin a Motor Efficiency Program?
Do you know how much Electric Motors cost you? • 200Hp 1800Rpm TEFC • Hours of Operation 7,200 • Cost K/H $.068 • Annual Power Cost $70,669 • Initial Purchase Price of Motor $6,350
Horsepower Vs Energy Usage Epact coverage 1-200 HP NEMA Premium coverage 1-500 HP
Motor ConstructionEach Motor is 10 HP, 1200 RPM Standard efficiency 84% Epact efficiency87.5% Premium Efficiency 90.2%
Why is Improving Motor Efficiency Important? • Over 50% of all Electrical Energy consumed is used by Electric Motors. Do you know how many Motors you have in your Home? • 82% of the Electrical Energy consumed in the USA is used by Electric Motors. Improving the efficiency of Electric Motors and the equipment they drive can save energy, reduce operating costs, and improve the End-User Profitability.
What is an Energy Efficient Motor? • Motor efficiency is the ratio of mechanical power output to the electrical power input. Improved design, materials, and manufacturing techniques enable energy-efficient motors to accomplish more work per unit. • Energy efficient motors offer other benefits. Energy efficient motors usually have higher service factors, longer insulation and bearing lives, lower waste heat output, and less vibration. Better Built Motors!
Efficiency Comparison Low Voltage Motors
When should you consider buying a NEMA Premium Motor? • NEMA Premium Motors should be considered in the following cases: • For all new installations • Purchasing new equipment packages, Air Compressors, HVAC Systems, and Pumps • Major modifications made to facilities or processes • Instead of rewinding older Motors • Replace oversized and under loaded Motors • Part of a Preventive Maintenance or Energy Conservation Program
Guide to select an Energy Efficient Motor if it will be used more than numbers of Hours/Year.
Should I rewind a failed Motor? • Failed Motor usually can be rewound, it is often worthwhile to replace a damaged motor with anew NEMA Premium Motor to save energy and improve reliability. • Motor is less than 40Hp. • Cost to rewound exceeds 65% of the price of a new Motor. • Motor was rewound before 1980.
Failed Motor 100 HP or Greater 75HP or Less Previously Rewound? Replace with New No Yes < 2 Times StandardEfficiency PremiumEfficiency Repair Cost below 50% of New? Review Repair Costs & Energy Savings vs. New Replacewith New EQP III Rewind Yes » Rewind No » Replace Repair / Replace Decision Tree
How should you begin a Motor Efficiency Improvement Program? • Survey your Motors. Gather nameplate information (Hp, RPM, Enclosure, voltage, amps) Initially focus on Motors that exceed minimum size and operating hours: • Survey three phase NEMA Design B. Collect Motor Nameplate Data. • 50Hp and above. • 2,000 hours/year of operation. • Constant load (not intermittent, cycle or fluctuating) • Older or rewound Standard Efficiency Motor. • Easy access.
How should you begin a Motor Energy Improvement Program? • Conduct Motor Replacement Analyses by the following three categories: • Motors Offering Rapid Payback through Energy Savings. Motors that run continuously (8,000 or more hours/year. • Improved Reliability - Oversized Motors • Utility Rebate Program - utility pays End-User to replace older inefficient motor with new NEMA Premium Motor.
How should you begin a Motor Efficiency Improvement Program? • Replace Motor at time of Failure – Motors with Intermediate Payback, when these motors fail, you will want to replace them a NEMA Premium Motor. Plan this decision out with End-User. Motor must be available from stock. • Leave Present Situation as is – Motors with Extended Payback. These motors are used less than 2,000 hours each year. They can be replaced with an Epact Motor.
Where did I get the information? • This Presentation was based on the US Department of Energy. (DOE) Energy Efficiency and Renewable Energy.