Basic knowledge about the motor
34. A three-phase transformer's six odd-numbered junction groups are 1, 3, 5, 7, 9, and 11. The 6 even-numbered group numbers are 0, 2, 4, 6, 8, and 10.
35. In the AC winding, the number of slots per phase per pole is q = q = Z/2p/m (assuming the number of slots is Z, the number of pole pairs is p, and the number of phases is m). In the AC winding, both the 120o phase band and the 60o phase band are used. Among them, the 60o phase band has a higher fundamental winding coefficient and back electromotive force.
36. You can use the symmetrical component method to analyze the asymmetric operation of transformers and synchronous motors. The premise of the application is that the system is linear, so you can apply the superposition principle to decompose the asymmetric three-phase power system into a positive sequence and a negative sequence. Three sets of symmetrical three-phase systems such as zero sequence.
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