scholarly journals Development of a Slot-less Motor for EPS with Small Torque Ripple

2021 ◽  
Vol 29 (2) ◽  
pp. 459-464
Author(s):  
Kazunari TSUJIMURA ◽  
Shogo OGATA ◽  
Hiromi OIKE ◽  
Takeo ISHIKAWA
Keyword(s):  
Torque Ripple ◽  
Small Torque

A New Type of Brushless DC Motor Control Strategy

2014 ◽  
Vol 986-987 ◽  
pp. 1031-1034
Author(s):  
Xiao Lei Zhang ◽  
Kui Hua Wu ◽  
Jian Wang ◽  
Wei Sun ◽  
Kui Zhong Wu ◽  
...  
Keyword(s):  
Control Strategy ◽  
Torque Ripple ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Energy Feedback ◽  
Brushless Dc ◽  
Dc Motor Control ◽  
New Type ◽  
Set Up ◽  
Small Torque

Because torque ripple disturbance can be created when the brushless dc motor is communicating, In this paper, from two aspects of energy feedback and the torque ripple, H/L - PWM - ON control strategy is analyzed .And a simulation system is set up. Through the trials, it shows that H/L - PWM - ON strategy can efficiently complete the energy feedback, has small torque ripple, and fully proves the feasibility and practicability of this control strategy.

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

Study and design of dual stator permanent magnet machine with spoke-type configurations using phase-group concentrated-coil windings

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1381-1389
Author(s):  
Dezhi Chen ◽  
Chengwu Diao ◽  
Zhiyu Feng ◽  
Shichong Zhang ◽  
Wenliang Zhao
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Low Cost ◽  
Dynamic Performance ◽  
Torque Ripple ◽  
Permanent Magnet Machine ◽  
Torque Density ◽  
Phase Group ◽  
High Torque ◽  
Simulation Results

In this paper, a novel dual-stator permanent magnet machine (DsPmSynM) with low cost and high torque density is designed. The winding part of the DsPmSynM adopts phase-group concentrated-coil windings, and the permanent magnets are arranged by spoke-type. Firstly, the winding structure reduces the amount of copper at the end of the winding. Secondly, the electromagnetic torque ripple of DsPmSynM is suppressed by reducing the cogging torque. Furthermore, the dynamic performance of DsPmSynM is studied. Finally, the experimental results are compared with the simulation results.

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