Direct thrust force control of open-end winding linear vernier permanent-magnet motor with reduced force ripple

Abstract

The linear vernier permanent-magnet (LVPM) motor incorporates the merits of high efficiency and low cost, which is very suitable for long stroke applications. This paper proposed a new direct thrust force control for dual inverter fed open-end winding LVPM motor to reduce force ripple. First, the topology and structural characteristics of the LVPM motor are briefly presented. Second, the mathematic model of the LVPM motor is derived. Then, a new direct thrust force control based on dual inverter fed open-end winding technique is proposed. The open-end winding drive is obtained by connecting six windings terminal of the LVPM motor to dual inverter respectively, which provides greater numbers of voltage vector and higher classes of output voltage to improve control performance. An improved space vector pulse width modulation based on dual inverter is configured to minimize force and flux ripples, which results constant switching frequency of operation. Finally, the simulation results are given to verify well steady-state and dynamic performances of the proposed control strategy.