Handbook of Small Electric Motors MAZ Part 7 ppsx

... Hz/s f 1 ,Hz aa 2 (a − 1) 50 1.200 1.440 0.200 45 1.333 1 .77 7 0.333 40 1.500 2.250 0.500 35 1 .71 5 2.941 0 .71 5 30 2.000 4.000 1.000 25 2.400 5 .76 0 1.400 MATERIALS 2.19 FIGURE 2.28 Core loss versus ... press shop to have a set of dies for each steel supplier of a given part. This can raise the costs of keeping several steel suppli- ers for one part. Also,the subtleties of prod...

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... Calculations / 6.45 Chapter 7. Synchronous Machines 7. 1 7. 1. Induction Synchronous Motors / 7. 1 7. 2. Hysteresis Synchronous Motors / 7. 5 7. 3. Permanent-Magnet Synchronous Motors / 7. 9 7. 4. Performance Calculation ... Systems for Small Electric Motors / 3.46 3.12. Sleeve Bearings / 3 .72 3.13. Process Control in Commutator Fusing / 3 .79 3.14. Armature and Rotor...

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... University. He has worked in sales of servo electric motors at Moog, Inc., and in sales of specialty motors at Doerr Electric. He is currently the vice president of Oven Systems, Inc. ANDREW E. ... from 1966 to 1 972 . BARRY L ANDERS (Chap. 9) has 24 years of experience in the design and testing of ac and dc motors, including writing electrical and mechanical design and test...

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... analysis of dc series motors, 4.14 in analysis of PMDC motors, 4.42 in analysis of single-phase motors, 6.13, 6 .74 in analysis of three-phase motors, 10.1 07 Kit encoders, defined, 10.9 Knee of the ... 6.68–6.69 versus speed, 5. 97 5.98 and step motors, 5.64–5.65, 5.64–5. 67, 5 .73 –5 .74 , 5 .76 –5 .77 , 5.80–5.81, 5.80–5.82, 5.82 and switched-reluctance motors, 5.10...

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... curves 7. 32 rates for spring combinations 7. 4 recommendations 7. 2 stress considerations 7. 3 symbols 7. 9 7. 13 7. 15 7. 16 7. 18 7. 19 terms and definitions 7. 43 ... 7. 7 7. 38 computer design programs 7. 42 design by programmable calculator 7. 3 design procedures 7. 4 direction of winding on helical 7. 3 d...

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... 12.50 0.64 5.5 860 540 7. 30 0.263 40 43.8 0 .72 10.54 14 .70 0.068 Alnico 5 -7 13.50 0 .74 7. 5 860 540 7. 30 0.263 55 59 .7 0.98 14.49 14.82 0.0 67 Alnico 8 8.20 1.65 5.3 860 550 7. 30 0.263 48 42.2 0.69 ... 9 470 125 6.10 0.220 90 79 .6 1.30 19.49 14.95 0.0 67 MQ2-E 15 (NdFeB) 8.25 7. 20 15 335 180 7. 60 0. 274 — 119.4 1.96 — — — MQ3-F 42 (NdFeB) 13.10 12.30 42 370 180 7. 60 0....

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... improvements in flexibility, reliability, and speed. 3.11 BEARING SYSTEMS FOR SMALL ELECTRIC MOTORS* Electric motors are devices that convert electrical energy into magnetic energy and finally into mechanical ... dry ice temperature of 75 °F and an oven temperature of 650°F. This allows for the extremely fast warming of the shaft and cooling of the rotor while assembling. A m...

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... present in the air gap mmf.Also, because of mmf symmetry,only odd harmonics can exist in an analysis of the air gap mmf. = (4 .75 ) The results of a Fourier analysis of the air gap flux harmonics for ... TR1, at the bottom of the slot, the angle is half of the tooth pitch angle: θ TR1 = (4.131) The length of the base of TR1 is L TR1 = (4.132) The angle within TR1 that the arc...

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... in num- ber of turns. For example, an 8-pole design using 10 turn/coil of 22 AWG would have a K ET value of 0. 97. A 2-pole design using 60 turn/coil of 22 AWG would have a K ET value of 0.88. The ... density): J mag = ΂΃ 4 − ΂΃ 4 L mag (mag density) ᎏᎏᎏ 77 2 D rm ᎏ 2 L mag (mag density) ᎏᎏᎏ 77 2 D ri ᎏ 2 D ri ᎏ 2 D ro ᎏ 2 D s ᎏ 2 D ro ᎏ 2 ELECTRONICALLY COMMUTATED MOTORS 5.21 T...

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... 90° =75 °; sin 75 °=0.9659 3 teeth = 90°=45°; sin 45°=0 .70 71 Sum = 1. 673 0 4. Percentage of total pole turns per coil = effective turn factor per coil ÷ sum × 100 5 teeth ==0. 577 3 × 100 = 57. 73% 3 ... pitch factor K p ) = Α percentage of total turns per coil × effective turn factor per coil 5 teeth = 0.5 576 = 0. 577 3 × 0.9659 3 teeth = 0.2988 = 0.4226 × 0 .70 71 Sum = 0.8564 K w...

Ngày tải lên: 11/08/2014, 07:23