Cogging Torque Computation and Optimization in <scp>Dual‐Stator</scp> Axial Flux Permanent Magnet Machines

Li, Qiaoshan; Zhang, Bingyi; Liu, Aimin

doi:10.1002/tee.23211

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…In recent years, permanent magnet synchronous machines (PMSMs) have been more and more widely researched and applied due to their high torque and high power density [1–3]. The electromagnetic torque of interior permanent magnet synchronous machines (IPMSMs) mainly comprises the permanent magnet and reluctance torque.…”

Section: Introductionmentioning

confidence: 99%

A Novel Asymmetric Interior Permanent Magnet Machine with Auxiliary Flux Barriers

Li,

Di,

Bao

2024

IEEJ Transactions Elec Engng

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A novel asymmetric interior permanent magnet (AIPM) machine is proposed in this paper. The machine's rotor consists of asymmetric poles and auxiliary flux barriers. The torque ripple of the machine is weakened by the asymmetric design of the left and right sides of the magnetic poles. The magnetic‐field‐shifting (MFS) effect improves the electromagnetic torque after adding the auxiliary flux barrier to shift the magnetic axis. The influence of critical geometrical parameters on the electromagnetic performance of the machine is investigated under the condition that the stator and permanent magnet volume remain unchanged. The relevant geometrical parameters of the machine are optimized and designed through the improved Taguchi method. The performance of the AIPM machine and the conventional machine under no‐load and load conditions are further compared by simulation analysis with finite elements, verifying the increase in electromagnetic torque and the reduction in torque ripple. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Section: Introductionmentioning

confidence: 99%

A Novel Asymmetric Interior Permanent Magnet Machine with Auxiliary Flux Barriers

Li,

Di,

Bao

2024

IEEJ Transactions Elec Engng

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“…e loss of high-frequency motors increase under PWM-powered, and the thermal load of high-power-density motors increase with the decrease of relative heat dissipation area, make temperature rise higher, which will pose a certain challenge to the temperature resistance of insulating materials and PM [1]; at the same time, changes in temperature rise have a greater impact on the electromagnetic parameters of main materials such as PM, copper wires, silicon steel sheets and so on, thereby affecting loss of motor, and then having an iterative effect on temperature rise. In order to solve the above problems, thermal analysis based on the two-way magneto-thermal coupling is very necessary for the research and application of AFPMM for vehicles.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Axial-Flux Permanent Magnet Motors for Vehicles Based on Fast Two-Way Magneto-Thermal Coupling

Zhang

Chen

et al. 2022

Mathematical Problems in Engineering

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Axial-flux permanent magnet motor (AFPMM) have small size and high power density. It has a good application prospect in the field of new energy vehicle driving. In this paper, based on a 56 kW AFPMM, the magnetic circuit characteristics are calculated by the split loop method, considering the influence of pulse width modulated (PWM) power supply. The loss is taken as the heat source, combined with the motor structure characteristics and cooling conditions, the lumped-parameter thermal network model of the motor is established to solve the steady-state and transient temperature distribution of each structure. By this way, fast and accurate thermal calculation of the motor is realized in design stage. The accuracy of the lumped-parameter thermal network model is verified by experiment. At the same time, the effects of spliting the permanent magnet (PM) into pieces, flow rate of cooling water, and loss distribution on temperature rise are analyzed. This research work provides an effective fast thermal calculation method for AFPMM and provides a reference basis for the design of similar motors. It has important value of theoretical significance and engineering practical.

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“…Furthermore, the eddy current loss of the rotor tends to increase at high-speed rotation in the concentrated winding because it has more spatial harmonics than distributed winding [15,16]. Slot combination optimization [17,18], skew [19][20][21], and closed slots [22,23] are effective in suppressing spatial harmonics. Skew tends to complicate the motor configuration, and the closed slot of the magnetic steel sheet may significantly reduce torque.…”

Section: Introductionmentioning

confidence: 99%

Reducing Rotor Temperature Rise in Concentrated Winding Motor by Using Magnetic Powder Mixed Resin Ring

et al. 2020

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The demand for high-speed servomotors is increasing, and minimal losses in both high-speed and high-torque regions are required. Copper loss reduction in permanent magnet motors can be achieved by configuring concentrated winding, but there are more spatial harmonics compared with distributed winding. At high-speed rotation, the eddy current loss of the rotor increases, and efficiency tends to decrease. Therefore, we propose a motor in which a composite ring made from resin material mixed with magnetic powder is mounted on the stator to suppress spatial harmonics. This paper describes three characteristic motor types, namely, open-slot motors, composite-ring motors, and closed-slot motors. Spatial harmonics are reduced significantly in composite-ring motors, and rotor eddy current loss is reduced by more than 50% compared with open-slot motors. Thermal analysis suggests that the saturation temperature rise value is reduced by more than 30 K. The use of a composite ring is effective in reducing magnet eddy current loss during high-speed rotation. Conversely, the torque characteristics in the closed-slot motor are greatly reduced as well as the efficiency. Magnetic circuits and simulations show that on electrical steel sheets with high relative permeability, the ring significantly reduces the torque flux passing through the stator, thus reducing the torque constant. To achieve reduced eddy current loss during high-speed rotation while ensuring torque characteristics with the composite ring, it is necessary to set the relative permeability and thickness of the composite ring according to motor specifications.

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Cogging Torque Computation and Optimization in Dual‐Stator Axial Flux Permanent Magnet Machines

Cited by 7 publications

References 18 publications

A Novel Asymmetric Interior Permanent Magnet Machine with Auxiliary Flux Barriers

A Novel Asymmetric Interior Permanent Magnet Machine with Auxiliary Flux Barriers

Thermal Analysis of Axial-Flux Permanent Magnet Motors for Vehicles Based on Fast Two-Way Magneto-Thermal Coupling

Reducing Rotor Temperature Rise in Concentrated Winding Motor by Using Magnetic Powder Mixed Resin Ring

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