scholarly journals Design and Analysis of a Permanent Magnet Vernier Machine with Non-Uniform Tooth Distribution

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7816
Author(s):  
Fei Zhao ◽  
Mengzhu Cao ◽  
Encheng Tao ◽  
Liyi Li
Keyword(s):  
Permanent Magnet ◽  
Uniform Design ◽  
Three Dimensional ◽  
Torque Ripple ◽  
Uniform Structure ◽  
Direct Drive ◽  
Cogging Torque ◽  
Dimensional Finite Element ◽  
Aerial Vehicle ◽  
Three Dimensional Finite Element

To improve the torque performance of the permanent magnet vernier machine in the direct-drive system for Unmanned Aerial Vehicle (UAV), this paper proposes the topology of non-uniform tooth distribution. This distribution, considering the additional flux harmonics, aims to contribute to torque improvement, whereas the cogging torque also increases at the same time. A phasors method is proposed to solve the issue caused by the non-uniform structure, adjusting the mechanic angle of each tooth reasonably to restrict the cogging torque. In addition, the non-uniform design is illustrated in detail, which includes the method of grouping the teeth, considering the factors of series pole ratio and winding layout. By using the three-dimensional finite element method, torque is significantly increased without additional torque ripple, which satisfies the desired design target.

Design and analysis of an axial flux permanent magnet motor for the direct drive radial piston pump

2019 ◽  
Vol 233 (19-20) ◽  
pp. 7077-7088
Author(s):  
Jingxiang Li ◽  
Xingwang Meng ◽  
Peng Dong ◽  
Shengdun Zhao
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Three Dimensional ◽  
Piston Pump ◽  
Direct Drive ◽  
Axial Flux ◽  
Drive Motor ◽  
Dimensional Finite Element ◽  
New Type ◽  
Three Dimensional Finite Element

Direct drive motor-pumps have attracted a lot of attention from researchers because of high efficiency and compact structure. This paper presents a new type of direct drive motor-pump, which integrates the structure of the radial piston pump and axial-flux permanent-magnet machine. The rotor of the disc motor is fixedly connected to the pump rotor, and the new pump uses a new type of distribution shaft for oil distribution. This structure reduces the intermediate transmission mechanism, and the application of the disc motor further reduces the axial size, the overall volume, and heat dissipation. The efficiency of the entire system has been improved. The three-dimensional finite element method is used to dynamically analyze flow field in the flow channel, which is extracted and simplified. The flow and pressure of the pump meet the design requirements in the simulation. A disc motor was designed for the pump, and the theoretical formula of the disc motor was derived. The initial size of the motor was obtained. The response surface method and three-dimensional finite element are used to optimize the corresponding axial-flux permanent-magnet machine. Loading the torque condition of the pump to the load end of the motor, the response of the motor meets the requirements.

scholarly journals Noise Reduction Design with Trapezoidal Back-EMF and Asymmetric Air-Gap for Single-Phase BLDC Refrigerator Cooling Fan Motor

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5467
Author(s):  
Jin-Hwan Lee ◽  
Sang-Yong Jung
Keyword(s):  
Single Phase ◽  
Three Dimensional ◽  
Torque Ripple ◽  
Air Gap ◽  
Manufacturing Cost ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Novel Method ◽  
The Dead ◽  
Three Dimensional Finite Element

In this study, a novel method for reducing the noise generated by single-phase claw-pole motors employed as refrigerator fan blowers is proposed. A single-phase claw-pole motor has the advantages of low manufacturing cost, easy manufacturing, and a high number of turns. However, in such motors, current delays occur owing to a high inductance; therefore, it is necessary to merge the back-electromotive force and current phases into the same phase using the phase advance method. Additionally, a single-phase motor exhibits dead torque and zero torque at an electrical angle of 180° owing to its electrical characteristics, and the dead torque deteriorates the average torque and torque ripple characteristics of the motor. In this study, a novel method is proposed to make the air gap asymmetrical by tilting the claw to reduce the noise generated by single-phase claw-pole motors. An asymmetric air gap allows the cogging torque to eliminate the dead torque caused by alignment torques, causing the torque ripple to decrease. To validate the effectiveness of the proposed method, the proposed model is compared with a base model via three-dimensional finite element analysis. Furthermore, the two models are manufactured and a noise test is conducted in an anechoic chamber to compare the noise difference between the two models.

3D Magnetic Field Modelling and Force Computation of a Permanent Magnet Linear Actuator

2009 ◽  
Vol 152-153 ◽  
pp. 411-414
Author(s):  
Ivan Yatchev ◽  
Krastyo Hinov ◽  
Vultchan Gueorgiev
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Three Dimensional ◽  
Force Characteristic ◽  
Linear Actuator ◽  
Static Force ◽  
Field Modelling ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
The Magnetic Field

Three-dimensional finite element method has been used for modelling of the magnetic field and computation of the electromagnetic force of recently developed permanent magnet linear actuator. The actuator is subject to specific requirements – having four stable positions without supply and maintaining minimum static force during the whole working stroke. The actuator consists of several cores with coils placed on a common yoke and a moving permanent magnet. It is intended for needle driving in a knitting machine. Influence of different factors on the static force characteristic is estimated.

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