362 Chapter 12 Electric Current and Related Parameters
M R R
Universal motor Two-value capacitor Shaded pole
R
Repulsion motor 3-phase squirrel cage
Schematic Diagrams for AC Motors
Load Speed Range Reversible Relative Other Characteristics Typical Uses
Type (7) (8) Cost (9) (10) (11)900, 1200, No Very low Light duty, low in efficiency Small fans, freezer
1800, blowers, arc welder
3600 blower, hair dryers900, 1200, Yes Low Simple construction Fans, furnace blowers,
Easy 1800, lathes, small shop tools,
Starting 3600, jet pumps
Loads Variable Yes Low Usually custom-designed Small compressors, fans
900 –1800 for special application1800, Yes High Used in motor sizes normally Centrifugal pumps, crop
3600 served by 3-phase power when dryer fans, feed grinder
3-phase power not available900, Yes Moderate Long service, low Water systems, air
1200, maintenance, very popular compressors, ventillating
1800, fans, grinders, blowers
36001200, Yes Moderate Handles large load variations Grinders, deep-well pumps,
1800, to high with little variation in current silo unloaders, grains
3600 demand conveyors, barn cleaners
Difficult
900, Yes Moderate Good starting ability and Pumps, air compressors,
Starting
1200, full-load efficiency drying fans, large conveyors,
Loads
1800, feed mills
36001200, Yes Moderate High efficiency, requires more Conveyors, deep-well pumps,
1800, to high service than most motors feed mills, silo unloaders
3600900, 1200, Yes Very low Very simple construction, Conveyors, dryers, elevators,
1800, dependable, service-free hoists, irrigation pumps
3600Source:AAVIM, Electric Motors.
TABLE 12.3 Examples of Motors used in Different Applications (continued)
Copyright 2010 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s).圀圀圀⸀夀䄀娀䐀䄀一倀刀䔀匀匀⸀䌀伀䴀圀圀圀⸀夀䄀娀䐀䄀一倀刀䔀匀匀⸀䌀伀䴀