Electric motors :how to Improve Energy Efficiency in Food Frozen and processing field
Electric motor-driven systems are estimated to consume more than one half of all electricity in the U.S. and more than 70 percent of all electricity in food manufacturing applications. If you are looking to improve the energy efficiency of your operation, then the first place you should evaluate is the motors. The initial purchase price of a motor represents only two percent of its total lifetime cost, while power usage represents almost all of the remaining 98 percent. It has been estimated that an energy management program that upgrades electric motors to more energy-efficient models can result in approximately 13 percent energy savings.
Motors that meet specifications established by the NEMA Premium® program are available from most manufacturers and will optimize efficiency, reduce power consumption, and improve system reliability. A relatively small upfront investment will pay back quickly and also pay dividends in energy savings for years to come. The savings are so significant, that it can be worthwhile to replace fully serviceable standard efficiency motors.
Additionally, NEMA Premium motors are made to higher manufacturing standards, which typically results in longer life, less maintenance and reduced downtime.
It's also important to know if a particular motor is the proper size for its application. A motor that is too large for the job wastes energy and costs extra money to operate. To help in this analysis, suppliers of AC and DC motors publish straightforward sizing procedures to ensure that a motor is properly sized for optimum energy efficiency.
A well-planned energy management program, coupled with proper motor maintenance, can reduce operating expenses and increase profits. Proper motor maintenance will enhance efficiencies and prolong a motor's life. Food processing applications are particularly hard on these products because of the moisture, oils and chemicals used in processing and clean-up. Items to check during inspection are:
* Old or inadequate lubrication
* Vibration
* Improper ventilation causing overheating
* The presence of dirt or other contaminants
* Motor and load misalignment
* Wide variation in load conditions
* Worn belts, sheaves and couplings
* Loose hold-down bolts
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