Speed Control of Dual Sensorless Interior Permanent-Magnet Synchronous Motors Based on the Sliding Mode Observer Principle

For permanent-magnet synchronous motor control, sensors are required to measure rotor position and velocity. Thus, we developed a sliding mode observer (SMO) for estimating the rotor angle to realize a sensorless drive system. The LAUNCHXL-F28069M development board from Texas Instruments was used to drive dual three-phase interior permanent-magnet synchronous motors (IPMSMs). Code Composer Studio (CCS) software was used to realize velocity control by applying a feedback current through field oriented control (FOC). The speed step response waveform indicated that the steady-state error of the IPMSMs was less than 1.5%. Fan blades were installed on the motor shaft for load testing. Torque and output power were determined by measuring the current in the dual IPMSMs. The speed control of the dual IPMSMs was realized in the CCS environment and operated in synchronous and asynchronous modes.