Sensorless Control Analysis of Electric Motor Drives Based on High-Frequency Signal Injection and Its Simulation Verification

The subject of this research is the sensorless control method verification an asynchronous motor by a simulation in area low speed (up to 5 Hz) via high-frequency analog signal injection method. implementation continuous simpler when compared with discrete injection; however, has more advantages processing. injected will be superimposed on main stator voltage. response manifested mainly based asymmetries motor, which are given design motor. influence inductance LS suppressed suitable elimination since asymmetry undesirable for rotor position detection. caused slotting used detect position. less slots inclined, stronger asymmetry. Therefore, verify estimation as realistically possible, mathematical model including due magnetic core saturation and slotting, been designed order get close possible real condition. Thus, chapter “Asymmetry Creation Rotor Slotting” describes phenomenon detail. Subsequently, INFORM detection implemented defined chapter: “Rotor Position Estimation Based HF Signal Injection.” Given fact that undesirable, he error reaches up 10%; therefore, saturations convenient After filtering out these asymmetries, accuracy achieved maximum 0.05 rad, representing 1%. inaccuracy directly proportional rotation speed, it also computing power, processing frequency, complexity algorithm. present paper serves essentially basis effectiveness efficiency other methods.