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Number 12

DIRECT-CURRENT MOTORS alloys. Fig. 30 shows V, 2900 r/min PM b. Calculat the moto sures low inertia and applications. 50 r/mir a. The mmf per pole at full-load b. The mmf at no-load c. Compar 200 r/m motors is the rela- and the inability to akening. 12 A separately excited dc motor turns at dissipa Advanced level The arma voltage required so that the motor runs at 1500 r/min. At 100 r/min. tor has a s and make a The following details are known about a 250 hp, 230 V, 435 r/min dc shunt motor: length of a. The a know enerator ef- kg/m b. The nominal full-load current: 862 A and polarity insulation class: H wher weight: 3400 kg external diameter of the frame: 915 mm c. The ays CoUPedicu part the ure volt- length of frame: 1260 mm a. Calculate the total losses and efficiency the ary the at full-load. 17 If we b. Calculot
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Transcribed Image Text:DIRECT-CURRENT MOTORS alloys. Fig. 30 shows V, 2900 r/min PM b. Calculat the moto sures low inertia and applications. 50 r/mir a. The mmf per pole at full-load b. The mmf at no-load c. Compar 200 r/m motors is the rela- and the inability to akening. 12 A separately excited dc motor turns at dissipa Advanced level The arma voltage required so that the motor runs at 1500 r/min. At 100 r/min. tor has a s and make a The following details are known about a 250 hp, 230 V, 435 r/min dc shunt motor: length of a. The a know enerator ef- kg/m b. The nominal full-load current: 862 A and polarity insulation class: H wher weight: 3400 kg external diameter of the frame: 915 mm c. The ays CoUPedicu part the ure volt- length of frame: 1260 mm a. Calculate the total losses and efficiency the ary the at full-load. 17 If we b. Calculot
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