Basic knowledge about the motor（8）
27. Asynchronous motors must absorb the hysteresis of reactive power from the grid for excitation.
28. A coil group is connected to an alternating current, and its magnetomotive force has a pulse-vibration property with time. A single coil is connected to an alternating current, and its magnetomotive force also has a pulse-vibration property with time.
29. When the synchronous generator is connected to the grid, the three-phase terminal voltage is required to have the same voltage as the grid three-phase voltage: frequency, amplitude, waveform, phase sequence (and phase).
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