Field Weakening Control of a Permanent Magnet Synchronous Motor

A PMSM (Permanent Magnet Synchronous Motor) has high efficiency and torque characteristics compared to other motors. To maximize the potential of a PMSM, several control methods can be used. Field Oriented Control (FOC) is one of the control methods that can produce high torque values, to optimize the capabilities of PMSM. The purpose of the FOC method is to effectively control the torque and flux of the motor by adjusting the current transformation in the reference frame dq. At high speeds, there will be a point where the supply voltage will reach a maximum point and cannot supply the motor. This situation requires control to weaken the rotor field so that the inverter can still supply the motor properly. The situation occurs when the motor speed exceeds the base speed. During this condition, the motor torque will decrease and this condition is called field weakening (FW) or constant power condition. This research will analyze the FW control algorithm and its effect on motor speed conditions higher than the base speed, analysis will be conducted using PLECS.