Handbook of Small Electric Motors MAZ Part 5 ppsx

... Practice / 4.140 Chapter 5. Electronically Commutated Motors 5. 1 5. 1. Brushless Direct-Current (BLDC) Motors / 5. 1 5. 2. Step Motors / 5. 47 5. 3. Switched-Reluctance Motors / 5. 99 Chapter 6. Alternating-Current ... / 3. 25 3.11. Bearing Systems for Small Electric Motors / 3.46 3.12. Sleeve Bearings / 3.72 3.13. Process Control in Commutator Fusing / 3.79 3.14. Arma...

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... Hz/s f 1 ,Hz aa 2 (a − 1) 50 1.200 1.440 0.200 45 1.333 1.777 0.333 40 1 .50 0 2. 250 0 .50 0 35 1.7 15 2.941 0.7 15 30 2.000 4.000 1.000 25 2.400 5. 760 1.400 MATERIALS 2.19 FIGURE 2.28 Core loss versus frequency ... T = 6. 452 ×10 4 lines/in 2 1 G = 6. 452 lines/in 2 1 kline/in 2 = 0. 155 kG 1 T = 10 4 G 1 kline/in 2 = 1 .55 ×10 −2 T Magnetic H Amps/m (A⋅T/m) Oersted Amps/in (A⋅T/...

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... 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. MILLER (Secs. 4 .5, 6.4.3, ... associate professor in electrical engineering at the University of Maine. He holds PhD and MS degrees from the University of Illinois. He is a senior member of IEEE and an assoc...

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... characteristics, 5. 79 5. 83 operation, 5. 83 5. 99 overview, 5. 1 performance, 5. 51 permanent-magnet (PM) step motors, 5. 48 5. 50, 5. 68 5. 74 sizing, 5. 51 5. 52 variable-reluctance (VR) step motors, 5. 47 5. 48, 5. 52 5. 67 Stiffness, ... 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...

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... 10 .53 10 .54 coiled spring 10 .54 10 .57 cotter 10 .53 10 .55 dowel 10 .52 10 .55 10 .59 grooved 10 .50 10 .53 10 .55 10.60 quick-release 10 .56 roll 10 .54 10 .56 ... face 8. 85 grinding 8 .53 8 .55 helical 8.69 8.1 15 hobbing 8 .53 hypoid 8. 85 internal 8.67 lubrication 8.146 manufacturin...

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... 4.20 3. 05 4.20 450 300 4.99 0.180 8 33.4 0 .55 1.44 2.63 0.380 Alnico Alnico 5 12 .50 0.64 5. 5 860 54 0 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 54 0 7.30 0.263 55 59 .7 ... 0.067 Alnico 8 8.20 1. 65 5.3 860 55 0 7.30 0.263 48 42.2 0.69 12. 65 18.30 0. 055 Alnico 8 HC 7.20 1.90 5. 0 860 55 0 7.30 0.263 48 39.8 0. 65 12. 65 19.40 0. 052 A...

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... OD) ᎏᎏᎏᎏ 0.00000 65 0.0 05/ 1. 250 0 ᎏᎏ 0.00000 65 3.20 CHAPTER THREE TABLE 3.2 Coefficients of Thermal Expansion for Common Materials Coefficient of thermal Material expansion, in/(in ⋅∆°F) Common steel 0.00000 65 Nickel ... improvements in flexibility, reliability, and speed. 3.11 BEARING SYSTEMS FOR SMALL ELECTRIC MOTORS* Electric motors are devices that convert electrical...

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... r a i a + pλ a (4 .55 ) V f = r f i f + pλ f (4 .56 ) 2πfN f φ M,max ᎏᎏ ͙2 ෆ DIRECT-CURRENT MOTORS 4.21 FIGURE 4.19 Consideration of universal motor brush shift. CHAPTER 4 DIRECT-CURRENT MOTORS Chapter ... 8.94 cos θ+0.467 cos 3θ+1.41 cos 5 +0.924 cos 7θ − 0.028 cos 9θ−0.02 cos 11θ+0 .52 3 cos 13θ+0.0094 cos 15 +иии (4.9) Of course, changing the PM pole arc or magnitudes of the arm...

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... 0.844 4 0.906 0. 958 0.837 5 0.904 0. 957 0.833 6 0.903 0. 956 0.831 ∞ 0.900 0. 955 8.270 1 1 ⁄2 0.911 0.960 0.844 All other fractional 0.900 0. 955 0.827 slot windings TABLE 5. 9 Summary of K p and K d Factors Slot ... step angles of 15 or 7 .5 , respectively. ELECTRONICALLY COMMUTATED MOTORS 5. 49 FIGURE 5. 48 Magnetization pattern of permanent-magnet step-motor rotor. FIGURE...

Ngày tải lên: 11/08/2014, 07:23

... factor: 5 teeth = 90°= 75 ; sin 75 =0.9 659 3 teeth = 90°= 45 ; sin 45 =0.7071 Sum = 1.6730 4. Percentage of total pole turns per coil = effective turn factor per coil ÷ sum × 100 5 teeth ==0 .57 73 ... v dr (6.60) λ ′ qr =λ qr (6.61) λ ′ dr =λ dr (6.62) We now will introduce Eqs. (6 .57 ) to (6.62) into the voltage and flux linkage equa- tions Eqs. (6 .50 ), (6 .51 ), (6 .55 ), and (6...

Ngày tải lên: 11/08/2014, 07:23