SynRM Sensorless Torque Estimation Based on Filter Free High Frequency Voltage Injection

Many modern control strategies of synchronous reluctance machines (SynRM) require precise output torque, however, torque measurement systems usually introduce additional devices into the system, occupy additional volume and expend additional cost. As one of the solutions, torque can be estimated, but the methods are always sensitive to machine parameters variation. This paper purposes a new and useful method for SynRMs parameter identification and torque estimation based on filter-free high frequency (HF) signal injection, which can provide accurate torque value with low system complexity and low chips computing load, and verifies the feasibility of the scheme by giving experiment result.