scholarly journals Proposal of C-core Type Transverse Flux Motor for Ship Propulsion – Increasing Torque Density by Dense Stator Configuration –

2014 ◽  
Vol 2 (3) ◽  
pp. 28 ◽  
Author(s):  
Y. Yamamoto ◽  
T. Koseki ◽  
Y. Aoyama
Keyword(s):  
Numerical Study ◽  
Design Method ◽  
Element Analysis ◽  
Low Speed ◽  
Torque Density ◽  
Ship Propulsion ◽  
High Torque ◽  
Transverse Flux ◽  
Effective Use ◽  
Simple Modeling

Electric ship propulsion system has been drawing attention as a solution for savings in energy and maintenance costs. The system is mainly composed of motor, converter and gearbox and required for high torque at low speed. In this situation, transverse flux motors (TFMs) have been proposed to fulfill the low-speed high-torque characteristic due to suitable for short pole pitch and large number of poles to increase torque output. In this trend, we have proposed C-core type motors taking advantage of TFMs’ structure. In this manuscript, a simple design method based on the magnetic-circuit theory and simple modeling of the motor is proposed to search a design parameter for maximizing torque as a pre-process of numerical study. The method takes into consideration the effects of magnetic leakage flux, magnetic saturation and pole-core combination in accordance with the systematic theory. The simple modeling is conducted based on a dense armature structure in previous axial flux motors (AFMs) applied to the new motor design. The validity of the method is verified by 3-D finite element analysis (FEA) and relative error is at most 20%. The minimalist design is shown to be advantageous for effective use in 3-D FEA. As a detailed design by the FEA, high torque density and low cogging to output ratio can be achieved simultaneously in the proposed machine.

scholarly journals VARIATION OF ELECTRIC PROPERTIES BETWEEN SURFACE PERMANENT MAGNET AND INTERIOR PERMANENT MAGNET MOTOR

2012 ◽  
Vol 06 ◽  
pp. 109-114
Author(s):  
BYUNG-CHUL WOO ◽  
DO-KWAN HONG ◽  
JI-YOUNG LEE
Keyword(s):  
Permanent Magnet ◽  
Complex Geometry ◽  
Torque Ripple ◽  
Direct Drive ◽  
Element Analysis ◽  
Torque Density ◽  
Interior Permanent Magnet ◽  
3D Fea ◽  
High Torque ◽  
Transverse Flux

The most distinctive advantage of transverse flux motor(TFM) is high torque density which has prompted many researches into studying various design variants. TFM is well suited for low speed direct drive applications due to its high torque density. This paper deals with simulation based comparisons between a surface permanent magnet transverse flux motor(SPM-TFM) and an interior permanent magnet transverse flux motor(IPM-TFM). A commercial finite element analysis(FEA) software Maxwell 3D is used for electromagnetic field computation to fully analyze complex geometry of the TFMs. General characteristics, such as cogging torque, rated torque and torque ripple characteristics of the two TFMs are analyzed and compared by extensive 3D FEA.

scholarly journals Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3639
Author(s):  
Rundong Huang ◽  
Chunhua Liu ◽  
Zaixin Song ◽  
Hang Zhao
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Torque Ripple ◽  
Axial Flux ◽  
Element Analysis ◽  
Torque Density ◽  
Axial Forces ◽  
Halbach Array ◽  
Radial Flux ◽  
High Torque

Electric machines with high torque density are needed in many applications, such as electric vehicles, electric robotics, electric ships, electric aircraft, etc. and they can avoid planetary gears thus reducing manufacturing costs. This paper presents a novel axial-radial flux permanent magnet (ARFPM) machine with high torque density. The proposed ARFPM machine integrates both axial-flux and radial-flux machine topologies in a compact space, which effectively improves the copper utilization of the machine. First, the radial rotor can balance the large axial forces on axial rotors and prevent them from deforming due to the forces. On the other hand, the machine adopts Halbach-array permanent magnets (PMs) on the rotors to suppress air-gap flux density harmonics. Also, the Halbach-array PMs can reduce the total attracted force on axial rotors. The operational principle of the ARFPM machine was investigated and analyzed. Then, 3D finite-element analysis (FEA) was conducted to show the merits of the ARFPM machine. Demonstration results with different parameters are compared to obtain an optimal structure. These indicated that the proposed ARFPM machine with Halbach-array PMs can achieve a more sinusoidal back electromotive force (EMF). In addition, a comparative analysis was conducted for the proposed ARFPM machine. The machine was compared with a conventional axial-flux permanent magnet (AFPM) machine and a radial-flux permanent magnet (RFPM) machine based on the same dimensions. This showed that the proposed ARFPM machine had the highest torque density and relatively small torque ripple.

Study on Low-Speed High-Torque PMSM for Surface-Drive System of Progressive Cavity Pump

2012 ◽  
Vol 516-517 ◽  
pp. 1643-1646
Author(s):  
Bing Yi Zhang ◽  
Shuai Wang ◽  
Gui Hong Feng ◽  
Xiang Cheng
Keyword(s):  
Finite Element Analysis ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Element Analysis ◽  
Low Speed ◽  
Linear Finite Element ◽  
Motor Design ◽  
Simulation And Experiment ◽  
High Torque ◽  
Fractional Slot Windings

This paper focus on a surface-mounted low-speed high-torque permanent magnet synchronous motor (PMSM) for progressive cavity pump wells. To minimize torque ripple, several methods is used such as proper pole-arc coefficient and fractional-slot windings. In the motor design, a non-linear finite element analysis (FEA) method is conducted to compute the performance of the motor. Through the simulation and experiment, the result shows that the design of low-speed high-torque PMSM is valid and presents a good performance.

scholarly journals Design and Experiment of a Large-Aperture Hollow Traveling Wave Ultrasonic Motor with Low Speed and High Torque

2019 ◽  
Vol 9 (19) ◽  
pp. 3979 ◽  
Author(s):  
Jun Liu ◽  
Zi-Jie Niu ◽  
Hua Zhu ◽  
Chun-Sheng Zhao
Keyword(s):  
Traveling Wave ◽  
High Performance ◽  
Power Transmission ◽  
Ultrasonic Motor ◽  
Vibration Velocity ◽  
Outer Diameter ◽  
Low Speed ◽  
Torque Density ◽  
Aperture Ratio ◽  
High Torque

To realize applications involving low speed and high torque in the high-performance actuator industry, especially in the aerospace field, we propose a novel 70H traveling wave rotary ultrasonic motor (TRUM) with an outer diameter of 70 mm and an aperture ratio of 53% (the ratio between the aperture and outer diameter). The power transmission mechanism between the stator and the rotor is analyzed, and a method for realizing low-speed–high-torque characteristics of TRUMs is proposed. ANSYS software is used to simulate the modal parameters of the stator, and the ratio β between the normal amplitude and the tangential vibration velocity of the stator is proposed. The larger the value of β, the lower the speed and the higher the torque. Furthermore, two prototype motors are fabricated, namely, 70HA and 70HB. Compared with 70HA, the maximum no-load speed of the improved 70HB (50 rpm) is decreased by 23.1% and the maximum stall torque (2.4 N∙m) is increased by 100%. Besides this, with a smaller mass of 210 g and a higher torque density of 11.43 N∙m/kg, 70HB has fundamentally different mechanical characteristics.

scholarly journals Investigation of a New Flux-Modulated Permanent Magnet Brushless Motor for EVs

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Ying Fan ◽  
Lingling Gu ◽  
Yong Luo ◽  
Xuedong Han ◽  
Ming Cheng
Keyword(s):  
High Speed ◽  
Simple Structure ◽  
Static Characteristics ◽  
Direct Drive ◽  
Element Analysis ◽  
Torque Density ◽  
Brushless Motor ◽  
Design Requirements ◽  
High Torque ◽  
Compact Design

This paper presents a flux-modulated direct drive (FMDD) motor. The key is to integrate the magnetic gear with the PM motor while removing the gear inner-rotor. Hence, the proposed FMDD motor can achieve the low-speed high-torque output and high-speed compact design requirements as well as high-torque density with a simple structure. The output power equation is analytically derived. By using finite element analysis (FEA), the static characteristics of the proposed motor are obtained. Based on these characteristics, the system mathematical model can be established. Hence, the evaluation of system performances is conducted by computer simulation using the Matlab/Simulink. A prototype is designed and built for experimentation. Experimental results are given to verify the theoretical analysis and simulation.

High torque density low speed permanent magnet machine

2011 ◽  
Author(s):  
Stephane Mouty ◽  
Abdollah Mirzaian ◽  
Frederic Gustin ◽  
Alain Berthon ◽  
Daniel Depernet ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Machine ◽  
Low Speed ◽  
Torque Density ◽  
High Torque
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