基于对称分量法理论，提出了基于检测正序、负序、零序电流分量的电动机保护方法。
Based on the symmetry component theory, a method of the motor protection is presented by measuring positive, negative and zero sequence current component.
首先运用对称分量法将单相异步电动机分为正序系统和负序系统，然后分别用矩阵分析了这两个系统中各自的有功功率、无功功率和视在功率。
Using the method of symmetric components and matrix, this paper analyses instantaneous power and the operation parameters concerning one-phase asynchronous motor in dynamic state.
通过对三相异步电动机空载实验中遇见的故障——三相相间功率的极大不对称性进行分析。
Through analyzing the asymmetry about the power among three phase of the no-load experiments of the triphase asynchronous motor is designed.
三相电压不对称对永磁同步电动机的性能影响较大。
Three-phase unbalanced voltages have great effects on the performance of a line-start permanent magnet synchronous motor.
利用等效电路，分析了三相异步电动机在不对称电压下的性能和对电机的危害。
By applying equivalent circuits, this paper has analyzed three-phase asynchronous motor property and the harm to generator under asymmetrical voltage.
通过分析低压隔爆电动机的主要故障类型，针对不对称性短路故障和断相故障提出了采用负序保护原理进行保护的方案。
Based on the analysis of main fault types of LV (Low Voltage) flameproof motor, the negative sequence protection principle is proposed for its asymmetric short circuit fault and open phase fault.
作为三相感应电动机单相运行的一种特殊接法，SEMIHEX连接可使三相感应电动机在单相电源上接近对称运行。
As one of the connections for three phase induction motor to operate from single phase supply, SEMIHEX connection can enable three phase induction motor have approximated symmetrical operation.
同时根据对称分量法的基本原理，提出以等效电流作为电动机热积累计算的依据的算法。
And, the equivalent current algorithm for the electric motor heat accumulation is proposed based on the symmetrical component method.
永磁电动机本质上是一种含脉动激励的对称机构，将不可避免地产生振动和噪声，影响了电动机的性能。
Permanent magnet motor is essentially symmetrical structure with pulse excitation, so it inevitably has vibration and noise, which affects performance of the motor.
永磁电动机本质上是一种含脉动激励的对称机构，将不可避免地产生振动和噪声，影响了电动机的性能。
Permanent magnet motor is essentially symmetrical structure with pulse excitation, so it inevitably has vibration and noise, which affects performance of the motor.
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