A Novel Double-Stator Tubular Vernier Permanent-Magnet Motor With High Thrust Density and Low Cogging Force

Abstract

This paper proposes a novel tubular double-stator vernier permanent-magnet (TDS-VPM) motor for artificial hearts. The key of the proposed motor is double-stator and vernier structures. Due to its vernier structure, more PMs can be adopted in the proposed TDS-VPM motor and the useful harmonics of the air-gap flux density are increased, thus improving thrust density. Furthermore, doublestator, namely inner stator and outer stator, has an appropriate 90° (electrical degree) angle difference. Since inner stator is located inside the mover, the motor space is fully used. Hence, the thrust density is enhanced and the axial direction length is reduced. Meanwhile, the angle difference between the inner and outer stator can reduce the cogging force of this TDS-VPM motor. The electromagnetic characteristics of the proposed motor are analyzed by using the time-stepping finite-element method, confirming the validity of the theoretical analysis.

Linear Permanent Magnet Vernier Generators for Wave Energy Applications: Analysis, Challenges, and Opportunities

“…Some unconventional types of linear generators have also been proposed but are not efficient choices, such as octagonal linear PM generators [77] or four-sided linear generators [78]. In both linear flat and tubular structures, the stator is the stationary part, and the translator is driven by a wave energy converter to extract the reciprocal motion of waves [79,80].…”

Review on Electrical Motor and Pump Assemblies in Ventricular Assist Devices & Total Artificial Hearts

“…motors : Double stator structure and a Vernier topology motors reported in [20][21], which are having higher force capability due to their double structure. but they suffered from a difficult manufacturability because of double structure nature and they faced low power density problems.…”