Modified indirect rotor field‐oriented control strategies for wye‐connected three‐phase induction motor drives under an open‐phase fault

Field‐oriented control (FOC) has been broadly used as an accurate control method for electric drives. The traditional FOC approach has been effectively developed to 3‐phase induction motor (3φ IM) drive systems in recent decades. Despite the usefulness of FOC methods during normal condition, these strategies are unable to control a wye‐connected 3φ IM (3φ IM y ) under the stator winding open circuit fault (SWOCF). This paper discusses modified indirect rotor FOC (FOC IR ) strategies for 3φ IM y drives under the SWOCF. The stationary reference frame (RF) model is presented and utilized to develop vector control systems for the faulty 3φ IM y using asymmetrical transformations. This model is also used to propose a modified FOC IR method for 3φ IM y drives against the SWOCF based on the symmetrical/traditional transformation and using the bi‐voltage controller. The performances of the presented control methods are confirmed via simulations and experiments for a 3φ IM y considering the SWOCF. The achieved results show the effectiveness of modified FOC IR strategies for vector control of the faulty 3φ IM y drive.