ELECTRIC MOTORS in .NET framework

Creating Data Matrix in .NET framework ELECTRIC MOTORS

ELECTRIC MOTORS
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FIGURE 6-1 Wiring schematics and how to reverse different motors
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CHAPTER SIX
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shows the wiring schematics and how to reverse the direction of rotation of the various types of motors
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CAPACITOR-START MOTORS
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The capacitor-start motor is a modi ed form of the split-phase motor It has a capacitor in series with the start winding It uses a centrifugal switch to remove the start winding after it has come up to about 75% of rated speed One advantage of the capacitor-start motor is its ability to start under load and develop high starting torque The capacitor-start motor can be reversed at rest or while rotating The speed is relatively constant, while the starting torque is 75 to 150% of rated torque The starting current is normal Duty cycle for motor-starting capacitors is rated on the basis of twenty 3-second periods per hour Sixty 1-second periods per hour should be one equivalent duty cycle Table 6-10 lists the ratings and test limits for AC electrolytic capacitors WARNING When you replace a defective capacitor, it is imperative that the new capacitor be of the same voltage and microfarad rating
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MOTOR ENCLOSURES
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Enclosure is the term used to describe the motor housing, shell, or case There are several common types of enclosures Drip-proof Enclosures Drip-proof (DP) enclosures are usually used indoors in clean, dry locations The ventilation openings in the end shields or bells and in the housing or shell are placed so that drops of liquid falling within an angle of 15 from the vertical will not affect performance Explosion-proof Enclosures An explosion-proof (EXP-PRF) enclosure is designed to withstand an internal explosion of speci ed gases or vapors and not allow the internal ame or explosion
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TABLE 6-10 Ratings and Test Limits for AC Electrolytic Capacitors
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Capacity Rating, Microfarads 110-V Ratings Amps at Rated Voltage, 60 Hz 104 124 133 149 156 174 178 199 220 249 265 299 290 323 311 348 357 398 402 444 448 498 514 572 601 672 668 746 784 871 805 896 896 995 966 1078 1008 1120 1120 1244 1344 1493 1410 1576 1568 1742 1783 1991 Approx Max Watts 109 131 153 175 219 263 284 306 35 391 438 503 628 698 814 838 93 1067 1109 1232 1478 156 1725 1971 125-V Ratings Amps at Rated Voltage, 60 Hz 118 141 151 170 179 198 203 226 250 283 302 339 330 368 353 396 405 452 457 504 509 565 584 650 683 763 759 848 891 990 914 1018 1018 1131 1098 1225 1145 1272 1272 1414 1527 1696 Approx Max Watts 141 17 198 226 283 339 368 396 452 504 565 65 858 954 1114 1145 1272 1455 151 1679 2014 220-V Ratings Amps at Rated Voltage, 60 Hz 207 249 265 299 315 348 357 398 440 498 531 597 581 647 622 697 713 796 805 887 896 995 Approx Max Watts 438 526 612 70 876 1182 1281 135 1576 1756 197
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Nominal
Limits 25 30 32 36 38 42 43 48 53 60 64 72 70 78 75 84 86 96 97 107 108 120 124 138 145 162 161 180 189 210 194 210 216 240 233 260 243 270 270 300 324 360 340 380 387 420 430 480
Average 275 34 40 455 565 68 74 795 91 102 114 131 154 170 200 205 228 247 257 285 342 360 399 455
50 60 65 70 80 90 100 115 135 150 175 180 200 215 225 250 300 315 350 400
Source: Courtesy of General Electric
CHAPTER SIX
to escape If the motor is below 1/3 horsepower, the enclosure may be explosion-proof nonventilated (EPNV); if the motor is larger, an explosion-proof fan-cooled enclosure (EPFC) is usually used Open Enclosure Open (OP) enclosures are used indoors in clean locations Ventilation openings in end shields and/or in the shell permit the passage of cooling air over and around the windings The location of the openings is not restricted Totally Enclosed In a totally enclosed (TE) housing, there are no openings in the motor housing, but it is not airtight This type of housing is used in locations that are dirty, oily, and the like There are two types of totally enclosed housings: totally enclosed fan-cooled (TEFC), which have a fan to blow cooling air over the motor, and totally enclosed non-ventilated (TENV), which are not equipped with a fan and depend on convection air for cooling
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