大功率鱼雷直流无刷电动机调速系统用三相逆变器PWM控制的谐波分析

Harmonic analysis of a three phase inverter PWM controlling scheme of VS system of a torpedos great power brushless DC motor

针对直流无刷电动机 1 2 0°通电方式 ,根据直流PWM基本原理与傅氏级数理论 ,建立了计算三相逆变器开关角与定子相电流谐波的数学模型 ;通过仿真分析得出了输出谐波分布规律 ,并结合鱼雷运动过程进行了探讨 .

Based on the principle of DC PWM and Fourier analysis method the mathematic model is built in the light of brushless DC motor′s patern of conducting 120° electrical angle in each working cycle which can be used to calculate the switching angle and make harmonic analysis of phase current wave of the three phase inverter .By using the model the simulation is done on the computer .This paper gives the rule of output harmonic spectrum distribution and the curve of the phase current and THD variation after that inquire into the movement of the torpedo.