江苏春晨电缆有限公司生产JBHF电机引接线正弦交流电的相位，解析法是用数学公式表述正弦交流电与实践变化关系的方法。公式如下：
Analytic method is a mathematical formula to express the relationship between the sinusoidal alternating current and the practice change. The formula is as follows:
e=Emsin（ωt+Φe）
E=Emsin (omega t+ E)
u=Umsin（ωt+Φu）
U=Umsin (omega t+ U)
i=Imsin（ωt+Φi）
I=Imsin (omega t+ I)
它可以表达正弦量的最大值、初相角和周期。由上述公式可知，只要知道一个正弦量的最大值，初相角和频率，一个正弦量即完整的被确定，因此：JBHF电机引接线正弦交流电的相位
It can express the maximum value, the initial angle and the period of the sine. It is known from the above formula that as long as the maximum value of a sinusoidal quantity, the initial phase angle and the frequency, a sinusoidal amount is completely determined, so:
通常把：最大值、初相角、角频率叫做正弦交流电的三要素。
Usually, the maximum value, the initial angle, and the angular frequency are called the three elements of the sine alternating current.
正弦曲线法
Sine curve method

正弦交流电同频率电压电流波形图
Sinusoidal alternating current and frequency voltage and current waveform diagram
正弦曲线图示法即利用平面直角坐标系中的横坐标表示时间t，纵坐标表示正弦量的瞬时值，并根据解析式的计算，用绘制出的正弦曲线图来表达正弦量的方法，如右图所示。
The method of sine curve is to express time t by using the abscissa in the plane rectangular coordinate system, and to express the instantaneous value of the sine quantity by the ordinate. According to the calculation of the analytic formula, we use the drawn sine curve to express the sine quantity, as shown in the right picture.
旋转矢量法
Rotation vector method

正弦交流电还可以用旋转矢量法表示。什么是旋转矢量呢？旋转矢量法如右图所示，从原点出发作一有向线段，令它的长度等于正弦量的最大值Im，与水平轴的夹角等于正弦量的初相位Φ，并以等于正弦量角频率的角速度ω逆时针旋转，则在任一瞬间，该有向线段在纵轴上的投影就等于该正弦量的瞬时值Imsin（ωt+Φ）。这样的有向线段就叫做旋转矢量。JBHF电机引接线正弦交流电的相位JBHF电机引接线正弦交流电的相位
The sinusoidal alternating current can also be expressed by the rotation vector method. What is a rotating vector? The rotation vector method as shown on the right, from the origin as a directed line segment, the maximum value of Im to make it equal to the length of the sinusoidal quantity, and the angle between the horizontal axis is equal to the initial phase of the sinusoidal quantity and phi, equal to the sinusoidal angular frequency of the angular velocity rotating counterclockwise, in an instant, the instantaneous to a projection line on the vertical axis is equal to the sine value Imsin (omega phi t+). Such a directed line is called a rotation vector.
正弦交流电的电压、电流和电动势都可以用旋转矢量表示，要进行同频率正弦量的加减运算时，可以先做出各个正弦量对于的旋转矢量，然后按照平行四边形法则求出合成旋转矢量，这合成旋转矢量的长度就是总的正弦量的最大值，合成旋转矢量与轴OX（横轴）的夹角就是总正弦量的初相位。
The alternating current voltage, current and electric potential can be expressed by the rotation vector, to the same frequency sinusoidal quantity of addition and subtraction, can make each sinusoidal quantity for rotation vector, and then according to the parallelogram law for the synthesis of rotation vector, the maximum value of the synthetic rotation vector is the length of total sinusoidal quantity synthesis, rotation vector and axis OX (horizontal axis) of the initial phase angle is the total amount of sine.
从上右图中可以看到，用旋转矢量来表示正弦量通常是很繁琐的，一般情况下：
As you can see from the picture on the right, it is usually very cumbersome to use the rotation vector to represent the sine.