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hw4[1] - ECE 321 Homework Set 4 Due Fri Oct 8 Must be...

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ECE 321 Homework Set 4 Due Fri. Oct. 8 Must be turned in at beginning of class (2:30). If not submitted in time, it will not be graded. Work in space provided. Name:_____________________________ User ID (login):___________________
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1. The static torque-versus-position characteristics of a VRSM are depicted below for one-phase-on-at-a- time excitation. and . If we wish to achieve CCW stepping (one at a time) what excitation sequence is needed: as-bs-cs- as... or as-cs-bs-as-... ? To what value should the current bet set in the active phase? Sketch the corre- sponding trajectory above assuming no overshoot and settles to equilibrium before next step is applied. L B 0.05 H = T L 0.06 N-m = rm θ 30 - o 60 - o 90 - o 30 o 60 o 90 o CCW CW 0 as bs cs cs bs as SL θ rm
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2. Sketch the time-domain block diagram assuming you are given the following blocks. Assume and are inputs. Label all gains and all inputs/outputs to/from each block. v 1 r 1 i 1 p λ 1 + = T e 1 2 -- i 1 2 dL 1 d θ r ---------- = p θ r ω r = 1’ 1 T e T L Jp ω r B ω r + = λ 1 L 1 θ r ( ) i 1 = v 1 T L gain 1 p -- integrator K + summer multiplier θ r θ r dL 1 d θ r ---------- 1 L 1 θ r ( ) ----------------
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3. (a) Assuming there is no commutator and , sketch in space below. Indicate maxi- mum and minimum values and the positions
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  • Spring '08
  • Staff
  • Electric motor, rotor, bs cs, static torque-versus-position characteristics, time-domain block diagram, open-circuit armature voltage

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