Design and Analysis of Modular Permanent Magnet Fault‐Tolerant Motor for Ship Direct‐Drive Propulsion

IEEJ Transactions Elec Engng

et al. 2021

Self Cite

Baoping Gan, Non-member Bingyi Zhang a , Non-member Yunfei Liu, Non-member Guihong Feng, Non-member Compared with multi-phase single-module permanent magnet motors, three-phase multi-modularized permanent magnet motors have stronger fault tolerance ability, widely used in aerospace, ship propulsion, and other special fields. Especially in ship directdrive propulsion, low speed and high torque modular combined stator fault-tolerant permanent magnet motor (MCS-FTPMSM) has high torque density, and fault-tolerant operation conditions may appear in actual operation, so it is essential to analyze the temperature of the fault-tolerant motor accurately. This paper analyzes the temperature of MCS-FTPMSM under different operating conditions and determines the longest operating time of the motor under different fault-tolerant operating conditions based on the 3D electromagnetic-temperature bi-directional coupling method. Among them, the loss of the motor is calculated by the 3D electromagnetic field, which is added to the 3D temperature field as an excitation, and then the material properties in the 3D electromagnetic field are updated according to the calculated temperature distribution. The cyclic iteration method is used to make the calculated temperature deviation less than the given error value. When analyzing the electromagnetic loss of the motor, the field-circuit coupling method is adopted to consider the influence of the current time-harmonics of the controller on the loss of the motor during actual operation. Finally, the 12kw100r/min 3 × 3 modular prototype was tested. By comparing the results of experiments, one-way coupling method (OWCM) and bi-directional coupling method (BDCM), it is found that the electromagnetic-thermal bi-directional coupling can more accurately predict the temperature of the fault-tolerant motor.

Section: Methodssupporting

confidence: 55%

Section: Methodsmentioning

confidence: 99%

“…The switching frequency of the power electronic device used is 6 kHz. The operating mode of the controller is described in reference [29].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Analysis of Modular Fault‐Tolerant Permanent Magnet Motor Based on Electromagnetic‐Thermal Bi‐Directional Coupling

Gan

IEEJ Transactions Elec Engng

et al. 2021

Self Cite

“…The direct-drive permanent magnet synchronous motor (DD-PMSM) can directly connect to the load, eliminating mechanical equipment such as reducers. It has been widely used in ship propulsion, hoist, ball mill, and other fields [1][2][3]. Parallel drive equipment, such as twin screw pumps, gear pumps, rolling mills, and crushers, is widely used in food, pharmaceutical, and industrial fields [4,5].…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of concave‐core stator direct‐drive permanent magnet motor

IET Electric Power Appl

et al. 2023

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To solve the problems mechanically caused by parallel direct‐drive permanent magnet motors (DD‐PMSM). This paper proposes a concave‐core stator direct‐drive permanent magnet motor (CCSDD‐PMSM) structure. In this study, an auxiliary yoke structure is proposed to optimise the magnetic circuit and analyse the cogging torque to achieve the minimum detent force. Based on the unit motor and combined with the magnetomotive force to analyse the symmetry of different winding distributions, the stability characteristics of the motor are studied. The magnetic field distribution of the motor load air gap is calculated using the finite element method. The contribution of different spatial order harmonics to the motor output torque is calculated using the Maxwell tensor method. The torque calculation expression of the CCSDD‐PMSM is given. Finally, an experimental prototype is made to verify the accuracy of the analysis in this paper.

Radial Force and Vibration Analysis of Modular Fault‐Tolerant Permanent Magnet Motor with Unequal Span Windings

Gan

IEEJ Transactions Elec Engng

et al. 2021

Self Cite

The low‐speed and high‐torque modular fault‐tolerant permanent magnet motor has the strong fault‐tolerant ability, and can make the motor output torque act on the load directly, and the system has the highest transmission efficiency, which is especially suitable for ship propulsion. In the electric ship direct‐drive propulsion system, the motor is the core of the power system. Because the motor is directly connected with the load, the intermediate buffer mechanism is canceled, so the smooth operation of the motor is put forward to higher requirements. Especially in some fault‐tolerant operations, the unbalanced radial force generated by the asymmetric operation may cause the motor to vibrate greatly, which will reduce the operational life of the motor and even bring new faults. In serious cases, the whole transmission system will be damaged. Therefore, it is necessary to study the vibration of the fault‐tolerant motor under different operating conditions. In this paper, the module combined stator fault‐tolerant permanent magnetic synchronous motor for ship direct‐drive propulsion is taken as the research object. Based on the Maxwell tensor method, the radial force wave expressions of the motor during regular operation and fault‐tolerant operation are derived, and the harmonic order and frequency, which have a significant influence on vibration are summarized. The radial force of the motor under different operating conditions with different control strategies is calculated by the finite element method, and the harmonic components are analyzed by the two‐dimensional Fourier transform. On this basis, the vibration of the motor and the mechanical strength of the rotor support frame are analyzed. The research results of this paper provide some reference for the subsequent vibration reduction strategies of fault‐tolerant motors. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.