A new two-degree of freedom switched reluctance motor for electric vessel

IET Electric Power Applications

Feng

et al. 2017

Two degree-of-freedom direct drive induction motor (2DoFDDIM), capable of rotary, linear and helical motion, has widespread application. A new mover structure is proposed, which is made from a hollow cylinder with copper cast in the axial slots and the circumferential slots on its surface. Then 3D finite element models of 2DoFDDIM are used to determine the performances of rotary, linear and helical motion developed by the motor. The results show that the new mover has a great improvement on the motor performances of all modes of motion compared to the initial mover. The researches on mover structure and characteristics of 2DoFDDIM present a new path of optimization on 2DoF induction motor.

Section: Structure and Principles Of Operationmentioning

confidence: 99%

“…2DoF induction motor (2DoFIM) is capable of rotary, linear and helical motion without gears. With advantages such as small size, high integrations, efficiency and so on, it has a widespread application in special industrial fields for drill press, carving machine, boring machines and grinders [1,2].…”

Section: Introductionmentioning

confidence: 99%

Mover design and characteristics analysis of 2DoFDDIM

IET Electric Power Applications

Feng

et al. 2017

“…Two‐degrees‐of‐freedom (2DoF) motors, which comprise rotary, linear, and helical motions simultaneously without gears, are widely used in industrial machineries such as boring machines and electric vehicles . Owing to their special structures, magnetic distribution, and motion forms, 2DoF motors are of great interest to motor experts all over the world.…”

Section: Introductionmentioning

confidence: 99%

Dynamic magnetic‐coupling effect of two‐degrees‐of‐freedom direct drive induction motor

Feng

IEEJ Transactions Elec Engng

et al. 2019

The special structure of the two‐degrees‐of‐freedom direct drive induction motor (2DoFDDIM) gives rise to the magnetic‐coupling between the rotary and linear magnetic fields. In this article, the dynamic magnetic‐coupling effect, which is against the static coupling effect and indicates the special phenomenon caused by coupling magnetic fields in helical motion, is exposed and investigated based on the 3D finite‐element model (3D FEM). The control variable method is adopted and only the coupling magnetic field in helical motion is considered in this research. The performance changes caused by the dynamic magnetic‐coupling effect of the motor are simulated and analyzed. The relationship between the coupling magnetic field and the dynamic magnetic‐coupling effect is disclosed. To validate the 3D FEM and the magnetic‐coupling effect of 2DoFDDIM, a prototype and an experimental platform were built and measured. For the induced voltages caused by the magnetic‐coupling effect, the finite element analysis results are in agreement with the experimental results. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

“…Two-degrees-of-freedom (2DoF) motion, which comprises rotary and linear motions simultaneously, i.e. helical motion, is widely used in industrial machinery such as boring machines, grinders, and electric vehicles [1,2]. In conventional driving machinery, 2DoF motion is realised by a rotary motor installed on a linear motor or special gears installed on a rotary motor, which inevitably increases the weight of the driving system and reduces its efficiency owing to the additional losses caused by the intermediate transmission mechanism.…”

Section: Introductionmentioning

confidence: 99%

Analysis of magnetic‐coupling effect on the performances of 2DoF direct‐drive induction motors

IET Electric Power Applications

Xie³

et al. 2018

The coupling between the rotary and linear magnetic fields is a special feature of two-degrees-of-freedom (2DoF) motors. The magnetic-coupling effect on the performances of 2DoF direct-drive induction motors (2DoF-DDIMs) is exposed and investigated based on 3D finite-element analysis and experiments on a prototyped motor. The performances of the 2DoF-DDIM are analysed under the conditions of with and without coupling. Further, the speed coupling coefficient is introduced and calculated to consider the effect of the magnetic-coupling effect on speed. The magnetic-coupling effect of 2DoF-DDIM, which leads to induced voltages and currents under rotary or linear motion and lower speed and higher fluctuations under helical motion, enhances with an increase in the source frequency and rotary speed. This research on the magnetic-coupling effect of 2DoF-DDIM will provide a significant reference for characteristic research and precise control of 2DoF-DDIM.