synchro motor of load change-over 负载换向同步电动机
Synchronous motor excitated magnet by direct current can make output mechanism specialities matched load specialities by means of adjusting exciting current to change magnetic field and power factor.
这是因为电励磁的同步电动机可通过调节励磁电流来改变其磁场和功率因数，使输出的机械特性与负载特性相匹配。
Results The change relations between resonance frequencies and load of longitudinal-torsional ultrasonic motor were got.
结果得出了纵扭复合型超声马达谐振频率与负载的变化关系。
With the compressor in part, motor load can change speed, with gas and still maintain a high efficiency;
当空压机处于部分负载时，电机能随气量改变转速，并仍保持高的效率；
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