基于多级结构特性的航空无刷同步起动/发电机转子初始位置估算

Initial Rotor Position Estimation for Aircraft Brushless Synchronous Starter/Generators Based on Multi-stage-structure Characteristics

由于航空无刷同步起动/发电机(aircraft brushless synchronous starter/generator,ABSSG)起动阶段凸极率可变,在不使用位置传感器时较难获得精确的转子位置。为了提高估算精度,该文利用主电机定转子间互感随转子位置变化而变化的特点,提出一种基于多级结构特性的ABSSG转子初始位置估算方法。考虑到ABSSG无刷化特性,在主电机定子施加电压信号后,通过提取励磁机定子绕组中的响应信号来估算转子位置。所提方法分为两步:首先,向主电机定子绕组注入高频信号,估算不含象限信息的初始转子位置;其次,注入低频信号确定转子位置象限信息。在所提方法中,通过对励磁机定子电流进行傅里叶分析获取高频注入信号的最佳注入频率。最后,通过实验验证该文所提方法的可行性与有效性。

The variable magnetic saliency ratio of main machine(MM)in aircraft brushless synchronous starter/generator(ABSSG)makes it difficult to obtain the accurate initial rotor position without a position sensor.In order to improve the estimation accuracy,this paper proposes a novel initial rotor position estimation method for the ABSSG based on the multi-stage-structure characteristics.It uses the fact that the mutual inductance between the stator and rotor windings of MM changes with the change of rotor position.As there is no brush and slip ring in the ABSSG,voltage signals are imposed in the stator windings of the MM,and the response current signals extracted from the stator windings of the main exciter(ME)are used to estimate the rotor position.The proposed method included two steps:first,high frequency(HF)voltages are injected to estimate the initial rotor position without the sector information;after that,low frequency voltage is used to identify the sector.Optimum frequency of the injected HF voltage is obtained through the Fourier analysis of ME stator currents.Finally,experimental results verify the feasibility and effectiveness of this method.