Hybrid Modulation Fault-Tolerant Control of Open-End Windings Linear Vernier Permanent-Magnet Motor With Floating Capacitor Inverter

In this paper, a new hybrid modulation fault-tolerant control of an open-end winding linear vernier permanent-magnet (OEW-LVPM) motor is proposed. By using a floating capacitor inverter, the proposed OEW-LVPM motor drive can continue operation under open-circuit fault condition. The OEW-LVPM motor fed by dual-inverter system consists of two inverters, which are connected to both ends of the motor windings, including a dc power named as main inverter (MI) and a floating capacitor called as capacitor inverter (CI). When one switch is broken in the CI, the CI topology will be restructured to a three-phase four-switch inverter. Then, an improved six-step modulation is investigated in the MI to reduce the switching frequency, while the conventional modulation is applied in the CI. Thus, the MI can provide all the active power, and the CI is only used to supply the reactive power. The proposed fault-tolerant control method is simulated and the experiments with the OEW-LVPM motor drive are also accomplished to verify the feasibility.