# HW7 - Special problem#2(partial answer 16 Joules 32...

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ECE 430 homework assignment #7 (In class quiz – Fri, Oct 23) Text problem 4.8 Text problem 4.9 Text problem 4.12 Special problem #1 (partial answer MIsIr) A single-phase rotating machine has one coil on the stator with current i s and one coil on the rotor with current i r . The inductances for this machine are (assume linear magnetic core): L ss = L s L sr = Mcos(θ) L rs = Mcos(θ) L rr = L r The machine is being operated such that the currents i s and i r can be assumed to be constants at I s and I r respectively while the shaft is rotated from θ equals zero to θ equals π/2. For this change from “point a” to point b”, find: a) The energy transferred from the mechanical system into the coupling field as the system moved from point a to point b with constant currents. b) The energy transferred from the electrical system into the coupling field as the system moved from point a to point b with constant current.
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Unformatted text preview: Special problem #2 (partial answer 16 Joules, 32 Joules, -800N) An electromechanical system is described by the following flux-linkage vs current characteristic: 04 i- 01 x . . λ = It is operated on the closed cycle a - b - c - d - e as indicated below, with x constant during a - b and also c - d. The current is constant during b - c and also d - e. a b c d e i (Amps) i b i b λ (Wb turns) 8 λ c x (meters) .03 .03 .02 .02 .03 Find the following things: a) i b and λ c . b) The energy stored in the coupling field at points b and c. c) The force of electric origin at points b and c. d) Sketch this cycle in the λ vs i plane (label points a, b, c, d, and e) e) Sketch this cycle in the force vs x plane (label points a, b, c, d, and e) f) Is this is a motor or a generator?...
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