Electromagnetic Performance Analysis on the Bearingless Permanent Magnet Synchronous Motor With Halbach Magnetized Rotor

Zhang, Tao; Ye, Xiaoting; Mo, Lihong; Lu, Qing

doi:10.1109/access.2019.2937897

Cited by 14 publications

(10 citation statements)

References 44 publications

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“…where 𝜇 0 is the permeability of air, N is the number of coil turn, 𝐾 𝑓 is a constant for the fringing inductance, 𝑙 𝑔 is the air gap length, 𝑙 𝑚 is the permanent magnet thickness, 𝜃 𝑜 and 𝜃 𝑛𝑜 are the overlapping and the nonoverlapping angle, respectively. The radial force 𝐹 𝐶1 and torque 𝑇 𝐶1 in one pole can be expressed as (9). Since (𝑙 𝑔 + 𝑙 𝑚 ) is fixed, by neglecting the fringing flux 𝐹 𝐶1 can be simplified as (11),…”

Section: Radial Force Calculation Methodsmentioning

confidence: 99%

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Radial force cancellation of bearingless brushless direct current motor using integrated winding configuration

Yousif

Mohammed

Ali

2022

IJEECS

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A bearingless brushless direct current (BLDC) motor incorporates the function of magnetic bearings into a BLDC motor, making it a new type of high-performance motor. In this paper, the main motor windings are used to generate the radial force cancellation by injecting the required dc current, “integrated winding configuration”. The bearingless BLDC motor, direct current (DC) cancellation system model is established with the aid of (ANSYS/MAXWELL) software. The simulation results confirm that the rotor radial force is approximately zero and results from a balanced distribution of the magnetic flux density. The proposed DC excitation system is suitable to realize the rotor radial force cancellation in the bearingless BLDC motor. The simulation results of the proposed configuration show the approach of integrating winding configuration at different active pole positions to find the more efficient suspension performance and reduce the suspensions system current.

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Section: Radial Force Calculation Methodsmentioning

confidence: 99%

“…As a result, a force of levitation is created. The rotor shaft is suspended in the air gap without mechanical contact, and the rotor rotates without hitting the bearing surface [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Radial force cancellation of bearingless brushless direct current motor using integrated winding configuration

Yousif

Mohammed

Ali

2022

IJEECS

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“…In Halbach magnet magnetization, the magnetic field similar to sinusoidal distribution is the most ideal [15][16][17], but it is difficult to achieve in engineering manufacturing. In order to obtain the sinusoidal magnetic field, the permanent magnet is usually segmented, and then each segment of the permanent magnet is changed to the appropriate magnetization direction.…”

Section: Traditional Halbach Arraymentioning

confidence: 99%

Characteristic Research on Double Rotor Permanent Magnet Motor With Irregular Halbach Array

Pan¹,

Jing²

2021

PIER M

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Dual-rotor permanent magnet motor has the characteristics of high torque density and high efficiency and has a wide range of application prospects in many fields. However, the double air-gap structure also makes the internal magnetic field distribution more complicated and torque fluctuation more serious. To improve the double-layer air-gap magnetic field distribution and reduced torque pulsation, based on the Halbach array magnetization, the inner and outer irregular Halbach array dualrotor permanent magnet motor model was established to obtain the ideal one-sided magnetic field. By comparing the magnetic field distribution of the inner and outer layers, the no-load back-EMF, and the cogging torque, it is proved that the motor with the proposed structure can optimize the air-gap magnetic density and no-load back-EMF and reduce the cogging torque; at the same time, the torque ripple is also significantly reduced to ensure the stability of the motor operation.

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“…For high-pole motors, Halbach magnets can achieve the higher average torque; however for lowpole motors, parallel magnetization magnets are suggested. In addition for bearing motors, Halbach magnets also provide the sufficient radial force to suspen the rotating component [21]. It should be also noted that the fabrication of Halbach magnets is a challenge for fractional slot windings with high pole numbers.…”

Section: Introductionmentioning

confidence: 99%

Permanent Magnet Motor Design for Satellite Attitude Control With High Torque Density and Low Torque Ripple

et al. 2020

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This paper proposes a high-precision permanent magnet (PM) motor primarily used for the satellite attitude control. Considering aerospace applications, the dynamic response, weight and torque ripple are primarily concerns. To achieve the fast response and low ripple, a stator with slotless windings is designed to achieve the ripple free torque production. However, slotless windings contain visible leakage fluxes which might decrease the torque production. In this paper, several design methods are proposed to decrease leakage fluxes by concentrating the flux linkage under slotless topology. First, leakage fluxes caused by slotless windings are minimized through the radial-flux dual-rotor topology. This topology results in the flux linkage concentration in the air gap because two rotors are used separately for flux transmitter and receiver. It is concluded that the dual-rotor is well suited for a slotless windings motor to maximize the air gap flux linkage. Second, Halbach array magnets are chosen to realize the sinusoidal flux linkage distribution. Different array angles are analyzed to minimize the torque ripple. It is shown that the 22.5deg array angle results in the lowest torque ripple among three different Halbach magnets. More importantly, the average torque output is higher comparing to conventional radial magnet magnetization. Although several optimization methods have been developed on the motor geometric design, very few researches focus on the design of dual-rotor slotless windings and air gap length. This design approach further decreases leakage fluxes. In this paper, finite element analysis (FEA) is used for the satellite motor design. In addition, a motor prototype is built for experimental tests.

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Electromagnetic Performance Analysis on the Bearingless Permanent Magnet Synchronous Motor With Halbach Magnetized Rotor

Cited by 14 publications

References 44 publications

Radial force cancellation of bearingless brushless direct current motor using integrated winding configuration

Radial force cancellation of bearingless brushless direct current motor using integrated winding configuration

Characteristic Research on Double Rotor Permanent Magnet Motor With Irregular Halbach Array

Permanent Magnet Motor Design for Satellite Attitude Control With High Torque Density and Low Torque Ripple

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