International Journal of Applied Electromagnetics and Mechanics - Volume 71, issue 3

Authors: Zhang, Tao | Li, Guoli | Zhou, Rui | Wang, Qunjing | Wang, Lei

Article Type: Research Article

Abstract: Compared to traditional single-axis motors, reluctance spherical motors (RSMs) can generate rotational torque in three spatial latitudes on a single motor, thus enabling three degrees-of-freedom (DOF) motion. Due to the complexity of their structure, the finite element method (FEM) is usually used to calculate the torque, but this method has the problem of consuming huge computational resources and long computation time. To address the problem that the FEM for calculating the torque of RSM consumes a lot of computation time, the torque model of RSM is developed by using the virtual work method considering the nonlinear cases of the magnetic …circuit in this paper. Firstly, the inductance simulation of a single stator coil of a RSMs is carried out using finite element simulation software to obtain its inductance model. When the magnetic circuit is linear, the torque is obtained by partial differential calculation of the inductance surface. When the magnetic circuit is nonlinear, the distribution of flux linkage is first solved. Then, the electromagnetic torque is obtained by partial differential calculation of the magnetic co-energy. The calculated results are then projected to the global coordinate system to convert the two-DOF torque to the three-DOF torque. Finally, the experimental torque measurement platform is built, and the torque is measured and compared with the analytical calculation results. The results show that this method greatly reduces the amount of computing and simulation work with accurate modeling and provides a theoretical basis for the study of energization strategies and real-time control of the reluctance spherical motors. Show more

Keywords: Reluctance spherical motors (RSMs), torque model, virtual work method, inductance model, curvilinear differentiation

DOI: 10.3233/JAE-220104

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. 3, pp. 199-219, 2023

Authors: Ju, Lufeng | Dong, Wenbo | Wang, Qunjing | Jia, Jiang | Zhou, Rui | Xu, Jiazi

Article Type: Research Article

Abstract: The rotor attitude detection of spherical motors usually requires the installation of position sensors on the rotor shaft or stator to achieve, which occupy a large space and cause negative effects for the practical installation and application of spherical motors. In this paper, a sensorless position detection method for reluctance spherical motors based on the structure and operating characteristics of reluctance spherical motors is proposed. By detecting the stator coil inductance data at different rotor attitude angles, the position prediction model is constructed using the extreme learning machine algorithm. Through comparison and validation, it is demonstrated that the rotor attitude …angle obtained by the method is highly accurate, providing a feasible idea for the control and application of reluctance spherical motors. Show more

Keywords: Sensorless detection, sphercial motors, inductance characteristics, extreme learning machine

DOI: 10.3233/JAE-220079

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. 3, pp. 221-236, 2023

Authors: Chi, Song | Yan, Jianhu | Guo, Jian | Zhang, Jianjie | Zhang, Yuxi

Article Type: Research Article

Abstract: This paper proposes a multi-objective stratified optimization (MOSO) design for a permanent magnet linear synchronous machine (PMLSM) to obtain higher thrust and suppress the thrust ripple. MOSO can combine the advantages of different optimization methods and have fast and efficient optimization characteristics. Based on the parametric analysis of the influence of the auxiliary tooth size and the end-tooth width on the thrust performance, the sensitive variables are quickly filtered by using the Taguchi method. The response surface model (RSM) is built by adopting the central composite design (CCD) based on the sensitive variables. Moreover, the stratified optimization design of the …PMLSM is completed by combining with the multi-objective particle swarm optimization (MOPSO) to achieve a balance between local and global search. Finally, a prototype is manufactured, and experiments are implemented to verify the proposed method. Show more

Keywords: Permanent magnet linear synchronous machine, unequal tooth width, stratified optimization, response surface method, multi-objective particle swarm optimization

DOI: 10.3233/JAE-220087

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. 3, pp. 237-259, 2023

Authors: Monemi, Mehdi | Fallah, Mohammad Amir

Article Type: Research Article

Abstract: Practical remote vessel detection schemes are switching from the active lidar and sonar based methods to modern passive schemes such as analyzing the geomagnetic anomaly initiated from a moving remote vessel. The detection of a remote vessel and its heading direction has been fully studied in our recently published work through analyzing the two-dimensional frequency spectrum image of the magnetic wake captured by an array of magnetic sensors positioned under the sea surface. Instead of employing the fixed-positioned multi-sensor detection scheme, in this work, we study the heading detection of a remote vessel traveling in shallow/deep water through analyzing the …measured magnetic anomaly captured by a single airborne magnetic sensor. After representing mathematical expressions of the captured magnetic wake initiated from the remote vessel, we manage to formulate the Fourier transform of the magnetic wake, and show that the detection of a remote vessel as well as its heading direction can be estimated through detecting the frequency corresponding to the peak amplitude of the spectrum. We show through theoretical and numerical results that the lower the cross-angle between the drone and vessel traveling directions, the more accurate the estimation of the heading angle. Show more

Keywords: Magnetic wake, vessel heading, magnetometer, magnetic anomaly detection

DOI: 10.3233/JAE-220060

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. 3, pp. 261-271, 2023

Authors: Li, Ming | Lun, Shuxian | Yin, Hang | Dang, Chengtao

Article Type: Research Article

Abstract: A stator can sleeve and a rotor can sleeve are the particular structure of the canned induction motor (CIM), and the material of the can sleeve has an important influence on the performance of the CIM. However, the can sleeve made of a single existing material cannot guarantee that the CIM has both good efficiency and large power factor. Therefore, in this study, a can sleeve made of a laminated stainless steel composite is proposed to improve the comprehensive performance of the CIM. A 4.2 kW CIM was used as the research object. The influence of the composite layer in the …can sleeves on the electromagnetic field and performance of the CIM is studied, and the mechanism of improving the comprehensive performance of the motor is obtained. The research results can provide reference for selecting the can sleeve materials in the CIM design. Show more

Keywords: Canned induction motor, can material, can eddy current loss, time-step finite element method, electromagnetic field

DOI: 10.3233/JAE-210171

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. 3, pp. 273-285, 2023

Authors: Ni, Youyuan | Chen, Kang | Xiao, Benxian | Qian, Wei

Article Type: Research Article

Abstract: A surface-inset machine model having harmonics injected into Halbach magnet shape with salient iron and an analytical modeling method have been proposed. For the proposed model, considering the magnet outer surface shape with sinusoidal and third harmonic injection, after the analytically derived magnetic fields by solving the constructed matrix equations, the optimal third harmonic amplitude to fundamental amplitude ratio and the optimal magnetization angle have been determined from the field functions. The electromagnetic performances have been predicted and compared with other two surface-inset models. The comparison results show that the proposed optimized model has the largest electromagnetic torque with the …same magnet consumption. Finally, the finite element analysis predictions have been provided for verification the analytical performances. Show more

Keywords: Surface-inset machines, sinusoidal and third harmonic injection, Halbach, analytical modeling, optimization

DOI: 10.3233/JAE-220027

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. 3, pp. 287-303, 2023