江苏春晨电缆有限公司生产JBHF1140 2000 电机引接线，
上相量式既表示了电压与电流的数值关系，又表示了它们的相位关系。ji说明了电压相量是在电流相量的基础上逆时针方向旋转了90°，电压、电流之间的相位差角为90°。电压、电流之间的相量图如上图c所示。
The upphasor represents not only the numerical relationship between voltage and current, but also their phase relationship. Ji shows that the voltage phasor rotates 90 ° anticlockwise on the basis of current phasor, and the phase difference angle between voltage and current is 90 °. The phasor diagram between voltage and current is shown in Figure C above.
功率关系
Power relation
电感电路的瞬时功率为：
The instantaneous power of the inductive circuit is:
电感电路的瞬时功率计算公式
Calculation formula of instantaneous power of inductive circuit
瞬时功率pL的波形如上图d所示，从图中可以看出，pL的幅值为UI，频率为2ω，即pL以2倍于电流的频率按正弦规律变化。当u、i同为正值或同为负值时，如图d中第1、第3个1/4周期，pL为正值，说明在这个时段内，电感从电源吸收电能，并将电能转换为磁能储存起来；当u、i方向相反时，如图d中第2个、第4个1/4周期，pL为负值，说明在这个时段内，电感将储存的磁场能转换成电能送回电源。瞬时功率正、负半周包围的面积相等，说明电感从电源吸收的电能等于送回电源的电能。即：JBHF1140 2000 电机引接线
The waveform of the instantaneous power pl is shown in Figure d above. It can be seen from the figure that the amplitude of PL is UI and the frequency is 2 ω, that is to say, PL changes according to the sinusoidal law with the frequency twice that of the current. When u and I are both positive or negative, as shown in the first and third 1 / 4 cycles of figure D, and PL is positive, it means that in this period, the inductor absorbs electric energy from the power supply and converts the electric energy into magnetic energy for storage; when u and I are in the opposite direction, as shown in the second and fourth 1 / 4 cycles of figure D, PL is negative, it means that in this period, the inductor converts the stored magnetic energy into electric energy for transmission and return Source. The area surrounded by the positive and negative half cycles of instantaneous power is equal, which means that the electric energy absorbed by the inductor from the power source is equal to the electric energy returned to the power source. Namely: