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thanhdd

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  1. Thank you Mr.Marke for your advise! Thank you very much. You helped me more knowledge. The reason I want to use microcontroller is I think it's like pro... I think so? Is it right? Use PIC, I can practice and improve my skill. I want to check open and short circuit a same time also. Pls give me more advise about PIC, about digital voltage with comparator... if you have free time.
  2. Pls help me!!! I want to use PIC to check short or open circuit. Anyone can help me? The document, book or the code (ASM, C,...), which wrote about this subject. :rolleyes: I don't know much about microcontroller. So it took me much time but now i also have no idea for this problem. :P I only do it for fun and increase my knowledge. Pls help me
  3. When wind speed low, P1 low, stator connect Star so that U1 low, so keep I1 = const, flux is const (If stator connect Dyn, U1 will high but I1 low, flux is low too and not enough to magnetize iron) When wind speed high, P1 high, stator connect Dyn so that U1 high, so keep I1 = const, flux is const (If stator connect Star, U1 low but I1 will high, flux will very high, machine will too hot and magnetizing losses will increase) Is it wrong if I think so?
  4. In Induction Generator Double Fed(DFIG), stator connect Dyn when wind speed (speed of prime mover) is high; stator connect Star when wind speed (speed of prime mover) is low. This reduce flux level and magnetizing losses. Why?
  5. Using residual magnetism of rotor like ordinary induction generator ????
  6. I don't understand the operated principle of DFIG (induction generator double-fed). Can anyone help me understand : "when DFIG starts, where does DFIG receive electric energy from? (from grid(stator) or from converter)" because when DFIG starts, stator directly connected to grid, rotor also connected to grid via converter while speed below synchronous. Help me!
  7. I have an induction motor 40kW Wye/Delta 380/220 Star/Delta starters I=P/(rt3.U.efficiency.cos) U= 380 or 220 ? Help me!
  8. I'm sorry! There is my question: Two induction motors, which is larger if they are same power and voltage but different frequency? Can two wire machine convert kinds of others wire machine? And reverse? What is Space harmonic wave? How does it distribute in time? What is Time harmonic wave? How does it distribute in space?
  9. I'm sorry! There is my question: Two induction motors, which is larger if they are same power and voltage but different frequency? Can two wire machine convert kinds of others wire machine? And reverse? What is Space harmonic wave? How does it distribute in time? What is Time harmonic wave? How does it distribute in space?
  10. Two induction motors, which is larger if they are same power and voltage?
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