Three-phase PMSM vector control using decoupled flux and speed controller

Abstract

Described in this paper is a control method for a permanent magnet synchronous motor (PMSM) based on a decoupled speed and flux control technique where the speed and the flux of the PMSM are controlled separately. The actual torque and the feedback flux of the PMSM are directly calculated from the stator currents, while the speed and the angular position are read from the motor. Therefore, no flux/torque or speed/position estimators are required. A separate flux controller is used to generate the d-axis current error. The speed controller is used to generate the reference torque, while the q-axis current error is generated by the constant torque relation. The performance of the overall control system is examined using the Matlab/Simulink environment. The experimental work is tested using dSPACE DS1104. The performance of the motor is presented with reference speed step change. The simulation and the hardware results prove the effectiveness of the proposed method in controlling the speed and flux of a three-phase PMSM.

Keywords

• Flux controller
• Decoupling flux and speed
• Independent control
• Permanent magnet synchronous motors (PMSM)
• Constant torque control
• Vector control