Application of a Sliding Mode Observer for Sensorless Operation of Switched Reluctance Motors

The rotor speed and position control of a switched reluctance motor (SRM) needs an encoder or resolver to obtain information about the rotor position. These sensors may deteriorate in harsh environments, and increase the size and cost of the drive. This paper presents an evaluation of the sliding-mode observer to estimate a switched reluctance motor speed and rotor position. A new concept of observer based on a simple but quite accurate model of SRM has been proposed. A non-linear model of an SRM is used and a computer simulation is developed based on data from an experimental motor system. The implication of discrete–time implementation with various sample rates was examined

开关磁阻电机（switched reluctance motor, SRM）的转速与位置控制，需通过编码器或旋转变压器获取转子位置信息。此类传感器在恶劣工况环境下易发生性能劣化，同时还会增大驱动系统的体积与成本。本文针对用于估算开关磁阻电机转速及转子位置的滑模观测器（sliding-mode observer）展开评估研究。本文提出了一种基于简洁且精度较高的开关磁阻电机模型的观测器新思路。研究采用开关磁阻电机的非线性模型，并基于实验电机系统的实测数据开发了计算机仿真程序。此外，本文还考察了不同采样率下离散时间实现方案的相关影响。