在以驱动波相速度运动的坐标系中，用微扰法讨论。在正弦波驱动下的非线性漂移波的分波方程。
The nonlinear drift-wave equation driven by a sinusoidal wave is discussed in a coordinate system moving in the driving phase speed.
此方法属于单相检测法，先提取电网电流中的某相基波幅值，再将基波幅值乘以与该相电流同相位的正弦波，从而得出该相的瞬时基波电流。
This is a single-phase measurement that multiplies the amplitude of fundamental current of a line by a sine signal which has the same phase with the current.
正弦波检查法因条件所限，无正弦波发生器或频率不准，不易实现。
The sine wave inspection method is limited by condition, does not have the sine-wave-generator or the frequency is not precise, is not easy to realize.
本文在分析了几种SPWM调制方法的基础上，将基于对称采样法的SPWM调制算法应用于本设计中，产生了可调频调幅的正弦波脉宽调制信号。
The SPWM algorithm using symmetrical sample in this controller, can alter its frequency and amplitude. The good performance of the BLDC Motor controller using DSP is verified by the experiment.
自然采样法产生的SPWM脉冲效果最接近正弦波，但工程中不利于实时控制，在实际中常采用的规则采样法精度不够高。
As the natural sampling method generating SPWM pulses closer to sine wave is impractical in real-time control, the regular sampling method with poor precision is usually adopted in practical projects.
自然采样法产生的SPWM脉冲效果最接近正弦波，但工程中不利于实时控制，在实际中常采用的规则采样法精度不够高。
As the natural sampling method generating SPWM pulses closer to sine wave is impractical in real-time control, the regular sampling method with poor precision is usually adopted in practical projects.
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