Basic knowledge about the motor
14. The mechanical characteristics of the series-excited DC motor are relatively soft. The mechanical characteristics of the DC motor are relatively hard.
15. The transformer short-circuit test measures the leakage impedance of the transformer winding; the no-load test measures the excitation impedance parameter of the winding.
16. The transformer ratio is equal to the turns ratio of the primary winding to the secondary winding. Therefore, the ratio of the single-phase transformer can also be expressed as the ratio of the rated voltage of the primary and secondary sides.
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