For the constrained uncertain systems with polytopic description, a new design method of robust feedback model predictive control is proposed. By using a sequence of feedback control laws and designing the parameterdependent Lyapunov function for each model, the design method provides more degrees of freedom and then can improve the control performance and enlarge the feasible region. Based on the characteristic property of the design method, an offline design algorithm is developed to reduce the MPC controller's online computation burden. The numerical examples verify the effectiveness of the results presented in this article.

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Abstract:In this paper, a six-phase fault-tolerant modular permanent magnet synchronous machine (PMSM) with a novel 24-slot/14-pole combination is proposed as a high-performance actuator for wheel-driving electric vehicle (EV) applications. Feasible slot/pole combinations of the fractional-slot concentrated winding six-phase PMSM are elicited and analyzed for scheme selection. The novel 24-slot/14-pole combination is derived from the analysis and suppression of the magnetomotive force (MMF) harmonics. By making use of alternate-teeth-wound concentrated winding configuration, two adjacent coils per phase and unequal teeth widths, the phase windings of the proposed machine is magnetically, thermally isolated, which offers potentials of modular design and fault tolerant capability. Taking advantage of the leakage component of winding inductance, 1.0 per unit short-circuit current is achieved endowing the machine with short-circuit proof capability. Optimal design of essential parameters aiming at low eddy current losses, high winding factor and short-circuit-proof ability are presented to pave the way for a high-quality system implementation.

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