This paper proposes a feedforward (FF) control method that compensates for rotor flux linkage delay during field-weakening (FW) operation of induction motors (IMs) in high-speed regions. Conventional FF control is derived from steady-state voltage and current equations and does not account for the transient delay of rotor flux linkage caused by variations in the d-axis current. This leads to inaccurate FF operation during transients, increased voltage controller burden, and degraded torque response. To overcome this limitation, a flux linkage delay compensation scheme is developed by introducing FF current term based on the rotor time constant. This significantly reduces the transient load on the voltage controller and improves torque response. In addition, current trajectories during coasting operation are classified and analyzed, and a coasting FF control strategy is proposed to enhance control performance under coasting conditions. The effectiveness of the proposed method is verified through simulations using a 410-kW IM model, showing improved control stability and torque dynamics over the entire FW operating region.
