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# hw6 - the final steady-state speed c What is the...

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ECE 610 -HW#6, Due October 21, 2011 (11:59 pm Eastern time) 1) Problem 6.8, 6.9, 6.10 (in problems 9, and 10 assume it is a 3-phase machine, not a 2-phase machine) from the text. 2) A 3-phase surface-mount permanent magnet synchronous machine is operating under bal- anced conditions with the phase- a voltage synchronized to rotor position such that . volt-sec. mH, , volt-sec, . . a) Determine , , and system efficiency. b) If power was lost to the drive for 2 hours, and then restored with the voltage found in a), would increase? Provide an explanation. 3) A permanent magnet synchronous machine is energized at with applied voltages V, V, V, , Nm, , H, mH, , Vs. a) Determine the being used. b) Under the will the rotor begin to turn? Explain your reasoning. If it begins to turn, what is
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Unformatted text preview: the final steady-state speed? c) What is the steady-state ? d) What is the steady-state efficiency? 4) Using the parameters mentioned on page 272, use Excel (or Matlab, Mathcad, etc.) to generate the plots shown in Fig. 6.4-4. Create all the plots shown in the Figure. 5) For the machine studied in problem 4, use Excel (or Matlab, Mathcad, etc.), to compute the q- and d-axis currents, and efficiency as a function of speed for the case in which . Show plots of these curves. θ ev θ r φ v + = λ as ˜ 0.02 2----------j 0.2 2------– = L s 1 = r s 0.1 = Ω λ m 0.1 = P 4 = T l 0.0003 ϖ r 2 = V ˜ as I as ϖ r t = v as 2 = v bs 2 = v cs 4 – = θ r ( 29 = T l 0.1 = P 2 = L s 0.1 = L ls 10 = r s 1 = Ω λ m 0.1 = φ v φ v I as φ v =...
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