Optimal design of a surface-mounted permanent magnet motor with multi-grade ferrite magnets to reduce torque pulsations

2020 ◽  
Vol 64 (1-4) ◽  
pp. 79-89
Author(s):  
Yan Liu ◽  
Wenliang Zhao ◽  
Xue Fan ◽  
Xiuhe Wang ◽  
Byung-il Kwon
Keyword(s):  
Optimal Design ◽  
Permanent Magnet ◽  
Torque Ripple ◽  
Kriging Method ◽  
Permanent Magnet Motor ◽  
Element Analysis ◽  
Cogging Torque ◽  
The Finite Element Analysis ◽  
Torque Pulsations ◽  
Flux Density Distribution

This paper proposes an optimal design for a surface-mounted permanent magnet motor (SPMM) to reduce torque pulsations, including cogging torque and torque ripple, by using multi-grade ferrite magnets. Based on a conventional SPMM with single-grade ferrite magnets, the proposed SPMM is designed with four-grade ferrite magnets and then optimized to minimize torque pulsations by maintaining the required torque, utilizing the Kriging method and a genetic algorithm. The results obtained by the finite element analysis show that the optimized SPMM with multi-grade ferrite magnets exhibits improved airgap flux density distribution with highly reduced cogging torque and torque ripple by maintaining the same average torque, as compared to the conventional SPMM. Furthermore, the analysis of the working points for the multi-grade ferrite magnets reveals that the optimized SPMM has good durability against the irreversible demagnetization.

Design and analysis of a high-performance surface inset permanent magnet motor with asymmetrical rotor

2020 ◽  
Vol 64 (1-4) ◽  
pp. 211-220
Author(s):  
Wenliang Zhao ◽  
Cong Liu ◽  
Yujing Li ◽  
Xue Fan ◽  
Xiuhe Wang
Keyword(s):  
Permanent Magnet ◽  
High Performance ◽  
Torque Ripple ◽  
Performance Comparison ◽  
The Finite Element Method ◽  
Permanent Magnet Motor ◽  
Cogging Torque ◽  
Torque Pulsations ◽  
Performance Surface ◽  
Novel Design

This paper presents a novel design strategy for surface inset permanent magnet (SIPM) motors to suppress torque pulsations and maintain the high output torque by integrating the magnet skewing and asymmetrical rotor configurations. The magnet skewing is implemented within one magnet pole pitch to reduce cogging torque by avoiding excessive torque degradation, and the asymmetrical rotor is designed to improve the utilization of the torque components, thus to compensate the decreased torque due to the magnet skewing. To highlight the advantages of the proposed motor, a conventional SIPM motor is adopted for performance comparison with the aid of the finite element method. As a result, the proposed SIPM motor highly reduced the cogging torque (−79.7%) and torque ripple (−54.7%) while maintaining a high average torque when compared to the conventional SIPM motor.

Torque imporvement of IPM motors with skewing magnetic designs

2021 ◽  
pp. 3-10
Author(s):  
Dinh Hai Linh
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Torque Ripple ◽  
Maintenance Cost ◽  
Permanent Magnet Motor ◽  
Element Analysis ◽  
Speed Range ◽  
Interior Permanent Magnet ◽  
Interior Permanent Magnet Motor ◽  
Wide Speed Range

In this paper, a type interior permanent magnet synchronous motor designs is proposed for sport scooter application to improve constant torque wide speed performance. Interior Permanent Magnet machines are widely used in automotive applications for their wide-speed range operation and low maintenance cost. An existing permanent magnet motor (commercial QS Motor) is 3 kW-3000 rpm. In order to improve torque and power in wide speed range, a IPM electric motor 5.5 kW -5000 rpm can run up to 100 km/h: An Step-Skewing Interior Permanent Magnet motor alternatives is designed and optimized in detail with optimal magnetic segment V shape. The electromagnetic charateristics of Interior Permanent Magnet motors with V shape are compared with the reference Surface Permanent Magnet motor for the same geometry parameter requirements. Detailed loss and efficiency result is also analyzed at rate and maximum speeds. A prototype motor is manufactured, and initial experimental tests are performed. Detailed comparison between Finite Element Analysis and test data are also presented. It is shown that it is possible to have an optimized Interior Permanent Magnet motor for such high-speed traction application. This paper will figure out optimal angle of magnetic V shape for maximum torque and minimum torque ripple.

scholarly journals Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3887
Author(s):  
Jeong ◽  
Lee ◽  
Hur
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Component ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
Cogging Torque ◽  
Maxwell Stress Tensor ◽  
The Finite Element Analysis ◽  
Harmonic Components

This paper presents a mitigation method of slot harmonic cogging torque considering unevenly magnetized magnets in a permanent magnet synchronous motor. In previous studies, it has been confirmed that non-uniformly magnetized permanent magnets cause an unexpected increase of cogging torque because of additional slot harmonic components. However, these studies did not offer a countermeasure against it. First, in this study, the relationship between the residual magnetic flux density of the permanent magnet and the cogging torque is derived from the basic form of the Maxwell stress tensor equation. Second, the principle of the slot harmonic cogging torque generation is explained qualitatively, and the mitigation method of the slot harmonic component is proposed. Finally, the proposed method is verified with the finite element analysis and experimental results.

Optimal Design and Analysis of the Novel Low Cogging Torque Axial Flux-Switching Permanent-Magnet Motor

2018 ◽  
Vol 46 (11-12) ◽  
pp. 1330-1339
Author(s):  
Javad Rahmani Fard ◽  
Mohammad Ardebili
Keyword(s):  
Optimal Design ◽  
Permanent Magnet ◽  
The Novel ◽  
Permanent Magnet Motor ◽  
Axial Flux ◽  
Cogging Torque

The Method Pole of Width Modulation Reducing Cogging Torque in Permanent Magnet Motor

2012 ◽  
Vol 433-440 ◽  
pp. 4201-4206
Author(s):  
Yue Jun An ◽  
Wen Qiang Zhao ◽  
Li Ping Xue ◽  
Hong Liang Wen ◽  
Guo Ming Liu
Keyword(s):  
Permanent Magnet ◽  
Torque Ripple ◽  
Experimental Result ◽  
Testing System ◽  
Permanent Magnet Motors ◽  
Permanent Magnet Motor ◽  
Surface Type ◽  
Angle Sensor ◽  
Cogging Torque ◽  
Simulation Results

Cogging torque is one of the most important parameters of permanent magnet motors, which causes torque ripple, vibration and noise. This paper describes the mechanism of cogging torque, introduces several methods of reducing cogging torque and points out the advantage of novel magnet arrayed permanent magnet motor in reducing cogging torque. Ansoft software is used to build the simulation of conventional surface-type permanent magnet motor and novel magnet arrayed permanent magnet motor and to calculate their cogging torque. a cogging torque testing system which included the angle sensor, permanent magnet motor, torque wrenches and other components are tested two different structures motors’ cogging torque .The experimental result is consistent with the simulation results, it shows that the method of novel magnet arrayed permanent magnet motor reducing cogging torque is correct. The new method compare with the same specification on the surface of permanent magnet motor can reduce more cogging torque.

The Method of Pole Width Modulation Reducing Cogging Torque in Permanent Magnet Motor

2011 ◽  
Vol 383-390 ◽  
pp. 1369-1375
Author(s):  
Yue Jun An ◽  
Wen Qiang Zhao ◽  
Li Ping Xue ◽  
Hong Liang Wen ◽  
Guo Ming Liu
Keyword(s):  
Permanent Magnet ◽  
Torque Ripple ◽  
Experimental Result ◽  
Testing System ◽  
Permanent Magnet Motors ◽  
Permanent Magnet Motor ◽  
Surface Type ◽  
Angle Sensor ◽  
Cogging Torque ◽  
Simulation Results

Cogging torque is one of the most important parameters of permanent magnet motors, which causes torque ripple, vibration and noise. This paper describes the mechanism of cogging torque, introduces several methods of reducing cogging torque and points out the advantage of novel magnet arrayed permanent magnet motor in reducing cogging torque. Ansoft software is used to build the simulation of conventional surface-type permanent magnet motor and novel magnet arrayed permanent magnet motor and to calculate their cogging torque. a cogging torque testing system which included the angle sensor, permanent magnet motor, torque wrenches and other components are tested two different structures motors’ cogging torque .The experimental result is consistent with the simulation results, it shows that the method of novel magnet arrayed permanent magnet motor reducing cogging torque is correct. The new method compare with the same specification on the surface of permanent magnet motor can reduce more cogging torque.

scholarly journals A Study on Core Skew Considering Manufacturability of Double-Layer Spoke-Type PMSM

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 610
Author(s):  
Dong-Woo Nam ◽  
Kang-Been Lee ◽  
Hyun-Jo Pyo ◽  
Min-Jae Jeong ◽  
Seo-Hee Yang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Permanent Magnet ◽  
Double Layer ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Distortion ◽  
Torque Ripple ◽  
Element Analysis ◽  
Cogging Torque ◽  
The Core ◽  
The Difference

The spoke-type permanent magnet synchronous motor (PMSM), which is a general ferrite magnetic flux-concentrated motor, has a low portion of reluctance torque at the total torque magnitude. Therefore, as a way to increase the reluctance torque, there is a double-layer spoke-type PMSM that can maximize the difference in inductance between the d-axis and the q-axis. However, in the double-layer spoke-type PMSM, cogging torque, torque ripple, and total harmonic distortion (THD) increase with reluctance torque, which is the main cause of vibration and noise. In this paper, a method is proposed that provides the same effect as skew without dividing stages of the permanent magnet by dividing the core of the rotor into two types so that it is easy to manufacture according to the number of stages, unlike extant skew methods. Based on the method, the reduction in cogging torque and THD was verified by finite element analysis (FEA).

Optimal Design of a Spoke-type Permanent Magnet Motor with Phase-group Concentrated-coil Windings to Minimize Torque Pulsations

2017 ◽  
Vol 53 (6) ◽  
pp. 1-4 ◽  
Author(s):  
Wenliang Zhao ◽  
Jung-woo Kwon ◽  
Xiuhe Wang ◽  
Thomas A. Lipo ◽  
Byung-il Kwon
Keyword(s):  
Optimal Design ◽  
Permanent Magnet ◽  
Permanent Magnet Motor ◽  
Phase Group ◽  
Torque Pulsations

Reduction in Cogging Torque and Flux per Pole in BLDC Motor by Adapting U-Clamped Magnetic Poles

2017 ◽  
Vol 8 (1) ◽  
pp. 297 ◽  
Author(s):  
M. Arun Noyal Doss ◽  
S. Vijayakumar ◽  
A. Jamal Mohideen ◽  
K. Sathiah Kannan ◽  
N.D. Balaji Sairam ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Motor Performance ◽  
Torque Ripple ◽  
Direct Impact ◽  
Bldc Motor ◽  
Magnetic Pole ◽  
Element Analysis ◽  
Cogging Torque ◽  
Different Shapes ◽  
Magnetic Poles

A Permanent Magnet BLDC motor is designed for reduction in cogging torque and flux per pole. The cogging torque causes direct impact in permanent magnet BLDC motor performance by causing torque ripple problems. This paper proposes a new method for reducing cogging torque by adapting to U-clamped magnetic poles. Finite Element Analysis (FEA) is used to calculate the cogging torque and the flux per pole for different shapes of magnetic pole. It can be shown that the cogging torque could be greatly reduced by adapting to U-clamped magnetic poles. At the same time it is found that the flux per pole is also considerably reduced. The effectiveness of the proposed method is verified by comparing the cogging torque and flux per pole for various designs available in the literature.

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