Project Analog - August 2008 - (Page 15)

fiG. 1 ProJEcTED 2010 houSEholD moTor ENErGy coNSumPTioN iN TEraWaTT-hourS. common residential and industrial products perform with higher efficiencies. Due to the U.S. Energy Policy and Conservation Act and the European Union’s Energy Label Directive, 92/75/EEC, it is easy for businesses and consumers to compare electrical efficiencies of many appliances, as well as other resources such as natural gas and water. The labels illustrate how much an appliance, used in a typical fashion, will cost the owner to operate. The EPA’s Energy Star qualified appliances use between 10% and 66% less energy and/or water than standard models. The DOE believes that Energy Star appliances can save 20% to 30% of annual energy costs. Figure 1 shows the distribution of annual electricity consumption by U.S. households. Approximately 57% of the total energy produced worldwide is used to drive electric motors. In the U.S., electric motors account for 20% of electrical energy consumption. The typical American household consumes nearly 11,000 kWh/year and costs the homeowner about $1,000. A substantial portion of this is expended spinning motors in HVAC systems, well pumps, clothes washers, and so on—a total of approximately 100 billion kWh of electricity annually. At this level, enhancements in efficiency of just 5% make a big difference. Averaging just a few horsepower each, the ac induction motor (ACIM) has been the workhorse in most residential, commercial, and industrial applications for many decades. Its inexpensive construction, minimal maintenance, and excellent reliability have resulted in worldwide popularity; 90% of installed motors worldwide are induction motors. With the advent of new motor technologies, engineers have many new colors in their pallet—and yes, they are all shades of green. These include brushless dc (BLDC), switch reluctance (SR), and even versions of the steadfast ACIM. Although many of these motor topologies Contents Viewpoint Gate Drive Schemes for Motor Control Applications Considerations When Selecting the Proper MOSFET Driver Power Modules for Variable-Speed Motor Control Analog news Microchip analog page Motor Control Design Center Sample center microchipDIRECT Reference designs/ app notes Technical training fiG. 2 a SimPlE ac iNDucTioN moTor coNTrol caN uSE aDvaNcED TEchNoloGy Such aS fairchilD’S SmarT PoWEr moDulE. 15 · PrOjECT ANAlOG · VOluME 2 / NuMbEr 5 http://www.microchip.com http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=79&redirects=analog http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=79&redirects=analog http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2125¶m=en026178 http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2125¶m=en026178 http://sample.microchip.com/Default.aspx?testCookies=true http://www.microchipdirect.com/catalogselection.aspx?returnURL=default.aspx http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1423

Table of Contents Feed for the Digital Edition of Project Analog - August 2008

Project Analog - August 2008 Contents Viewpoint About Project Analog Sponsor Gate Drive Schemes for Motor Control Applications Considerations When Selecting the Proper MOSFET Driver for Your Application Power Modules for Variable-Speed Motor Control Efficient Motor/Controls Save Terrawatt-Hours/Year Analog News Contact Microchip Treelink Microchip Advanced Parts Selector (MAPS)

Project Analog - August 2008

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