Multi-Objective Optimization and Analysis of Six-Pole Outer Rotor Hybrid Magnetic Bearing

Liu, Gai; Ma, Zhihao; Zhu, Huangqiu; Sun, Jun; Huan, Junqi

doi:10.2528/pierc22010601

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…To obtain better torque quality, the parameters of the machine are optimized by multi-objective optimization aiming at maximum electromagnetic torque and minimum torque ripple [17]. Before optimization, some parameters such as the total volume, current value, and material of the machine are determined and held constant, as listed in Table 1.…”

Section: Parametric Optimizationmentioning

confidence: 99%

Analysis and Optimization of a Novel Consequent-pole Flux Reversal Machines with Asymmetric-stator-pole

Jing¹,

Yang²

2022

PIER C

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Flux reversal machines (FRMs) have a broad application prospect due to their simple structure, high efficiency, and high reliability. However, due to the large magnetic flux leakage between poles, the further improvement of torque density of the FRMs is limited. To reduce magnetic flux leakage and improve torque, a novel consequent pole FRM with asymmetric stator poles is proposed in this paper. The 'NS-NS' arrangement order of the permanent magnets (PMs) of the conventional FRM is changed to the 'NSN-S' PMs arrangement order with asymmetric stator poles, and the consequent pole topology is used simultaneously. All the N-poles of PMs are replaced by iron poles. Finally, the topology of the 'Fe/S/Fe-S' arrangement order is obtained. A simplified magnetic circuit model is established to explain the principle of reducing magnetic flux leakage. To improve the torque density, the key design parameters are optimized by genetic algorithm, and the optimal parameters of the machine are finally determined. Finally, the finite element model is established. Compared with the conventional FRM, the torque of the proposed machine is increased by 67.18%, and the consumption of PM is reduced by 51.6%. Therefore, the proposed machine has good electromagnetic characteristics and economic benefits.

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Section: Parametric Optimizationmentioning

confidence: 99%

Analysis and Optimization of a Novel Consequent-pole Flux Reversal Machines with Asymmetric-stator-pole

Jing¹,

Yang²

2022

PIER C

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“…M agnetic bearings (MBs) [1][2][3][4][5][6][7] are high-performance bearings that utilize electromagnetic forces to suspend rotating shafts in space. In contrast with traditional bearings, they offer numerous advantages, including frictionless operation, no need for lubrication, minimal losses, high rotational speeds, and active controllability.…”

Section: Introductionmentioning

confidence: 99%

Active Magnetic Bearing Three-level Modulation Strategy Based on Mixed Logical Dynamical Model Prediction Controller

Zou,

Jiang,

Yang

et al. 2024

PIER C

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Active magnetic bearings feature advantages of frictionlessness, low loss, and high reliability, making them extensively utilized in fields such as flywheel energy storage, aerospace, and beyond. However, conventional modulation strategies applied to digital control systems suffer from control delays, reducing current control precision and resulting in increased current ripple. To address the aforementioned issues, firstly, the operating principle of the active magnetic bearing drive system is analyzed. Based on hybrid systems theory, a mix logical dynamic model of the drive system is established by introducing auxiliary logical variables and auxiliary continuous variables to achieve three-level modulation. Secondly, integrating model predictive control theory, the established model is utilized as a predictive model to forecast and compensate for control delays in controlling current. Finally, a cost function is established based on the error between predicted current and reference current, and optimal control signals are generated to achieve precise control of the active magnetic bearings. The simulation results demonstrate that under light load conditions, the modulation strategy proposed in this paper reduces current ripple by 49.94% compared to traditional modulation strategies. Under moderate load conditions, the proposed modulation strategy reduces current ripple by 49.96%, while under heavy load conditions, it reduces current ripple by 49.99%. This validates the effectiveness of the proposed modulation strategy in compensating for control delays while retaining the three-level modulation scheme.

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“…A bearingless motor is a special motor, which has frictionless wear, corrosion resistance, no lubrication, and can realize "self-suspension operation" [1][2][3][4][5]. Compared with other motors, a bearingless induction motor (BIM) possesses the advantages of simple structure, solid and reliable, uniform air gap, low cost, and low groove pulsation torque.…”

Section: Introductionmentioning

confidence: 99%

Maximum Torque Output Strategy of Bearingless Induction Motor in the Field-Weakening Region

Fang¹,

Yang²,

Sun³

et al. 2022

PIER M

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In order to realize the maximum torque output (MTO) in the field-weakening region for a bearingless induction motor (BIM) stator vector control, a flux feedforward control strategy is proposed. Firstly, based on the restrictions of the stator flux oriented control and the dynamic characteristics of the current in the BIM field-weakening region, the optimal distribution of the torque current and excitation current and the dynamic model of the maximum torque output strategy are analyzed. Then, the fieldweakening region could be divided into two parts according to the change of slip. It can be proved that the BIM works under the voltage and current limitations in the field-weakening region I, and works under the voltage and torque limitations in the field-weakening region II. By this way, the optimal flux mathematical model of the BIM can be obtained. Finally, the MTO in the field-weakening region is proved. The simulation and experiment results show that the proposed flux feedforward control strategy in the field-weakening region can make the output torque and current tracking effect improve significantly when the BIM runs beyond the rated speed. At the same time, the good suspension performance of the BIM is realized.

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Multi-Objective Optimization and Analysis of Six-Pole Outer Rotor Hybrid Magnetic Bearing

Cited by 3 publications

References 26 publications

Analysis and Optimization of a Novel Consequent-pole Flux Reversal Machines with Asymmetric-stator-pole

Analysis and Optimization of a Novel Consequent-pole Flux Reversal Machines with Asymmetric-stator-pole

Active Magnetic Bearing Three-level Modulation Strategy Based on Mixed Logical Dynamical Model Prediction Controller

Maximum Torque Output Strategy of Bearingless Induction Motor in the Field-Weakening Region

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