0195136047.pdf
494 MAGNETIC CIRCUITS AND TRANSFORMERS VHIH 1000 = 2640 × 208. 33 1000 =550 kVA or VXIX 1000 = 2400 × 229. 16 1000 =550 kVA whic ...
PROBLEMS 495 Because of the absence of mechanical contact and lubricating fluids, magnetic bearings can be operated in high vacu ...
496 MAGNETIC CIRCUITS AND TRANSFORMERS 11.1.3In plotting a hysteresis loop the following scales are used: 1 cm=400 At/m and 1 cm ...
PROBLEMS 497 11.2.5Consider the toroid shown in Figure P11.2.5(a) made up of three ferromagnetic materials. Ma- terialais nickel ...
498 MAGNETIC CIRCUITS AND TRANSFORMERS 50 cm 50 cm 50 cm 1000 turns 1000 turns 5 A 5 A 0.5 cm Figure P11.2.6 *11.2.7Consider the ...
PROBLEMS 499 g 1 g 2 Figure P11.2.9 30 cm 20 cm 20 cm g 1 g 2 Figure P11.2.10 Source N g Figure P11.2.11 (a) Total magnetic flux ...
500 MAGNETIC CIRCUITS AND TRANSFORMERS kVA, 2400:480 V, following the notation of Fig- ure 11.3.4, the equivalent circuit impeda ...
PROBLEMS 501 (c) Determine the fraction of load for which the efficiency is a maximum, and calculate the corresponding efficienc ...
502 MAGNETIC CIRCUITS AND TRANSFORMERS 8 hours full load at unity power factor 8 hours no load 8 hours one-half full load at uni ...
PROBLEMS 503 Load 2400 V 208 V 3 single-phase transformers each rated 10 kVA, 2400:120 V, 60 Hz 30 kVA balanced Figure P11.5.4 1 ...
504 MAGNETIC CIRCUITS AND TRANSFORMERS former to step up voltage from 220 V to 2420 V. Without exceeding the rated current of an ...
12 Electromechanics 12.1 Basic Principles of Electromechanical Energy Conversion 12.2 emf Produced by Windings 12.3 Rotating Mag ...
506 ELECTROMECHANICS Electric energy Motor → ← Generator Mechanical energy Electromechanical energy converters, simply known as ...
12.1 BASIC PRINCIPLES OF ELECTROMECHANICAL ENERGY CONVERSION 507 in principle and are magnetic-field devices. Three basic princi ...
508 ELECTROMECHANICS Motional emfe=BlU (12.1.3) which is often called thecutting-of-fluxequation, whereBis the flux density of a ...
12.1 BASIC PRINCIPLES OF ELECTROMECHANICAL ENERGY CONVERSION 509 Interaction Current-carrying conductors, when placed in magneti ...
510 ELECTROMECHANICS Ferromagnetic pieces Magentic flux lines F F Figure 12.1.6Principle of alignment. and shows the direction o ...
12.1 BASIC PRINCIPLES OF ELECTROMECHANICAL ENERGY CONVERSION 511 dWm= 1 2 ( B^2 μ 0 ) Adg The definition of work gives us dW=Fdg ...
512 ELECTROMECHANICS (b) If an electric load resistanceRis connected across the terminals, what are the current and power dissip ...
12.1 BASIC PRINCIPLES OF ELECTROMECHANICAL ENERGY CONVERSION 513 EXAMPLE 12.1.3 A loudspeaker is a common electrochemical transd ...
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