Torque Calculation of Permanent-Magnet Spherical Motor Based on Permanent-Magnet Surface Current and Lorentz Force

Zhou, Rui; Li, Guoli; Wang, Qunjing; He, Jingxiong

doi:10.1109/tmag.2020.2976039

Cited by 24 publications

(4 citation statements)

References 20 publications

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“…Permanent magnet synchronous motor (PMSM) has been widely used in the fields of electric vehicle drive system, robot, CNC machine tools, and so on because of its advantages in small size, simple structure, high power, high torque density, and wide speed range (Garza-Alonso et al, 2021;Shi et al, 2020;Wu et al, 2020). With the spatial requirements of modern industry for permanent magnet motors, new permanent magnet motors with different spatial structures have developed rapidly, such as axial-flux permanent magnet motor (Taran et al, 2020), multiport magnetic gear permanent magnet motor (Zhu et al, 2018) and permanent magnet spherical motor (Li et al, 2020;Zhou et al, 2020). These new permanent magnet motors have compact structures and high spatial utilization.…”

Section: Introductionmentioning

confidence: 99%

Full prediction cascade control of permanent magnet toroidal motor with time-varying parameters

Liu

Wang

2023

Transactions of the Institute of Measurement and Control

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This paper presents the modeling and predictive control of permanent magnet toroidal motor (PMTM). Based on the spatial structure characteristics and working principle of toroidal motor, the time-varying inductance parameters are derived. The nonlinear mathematical model of toroidal motor is established in rotating coordinate system. The output fluctuation of the toroidal motor is analyzed. To improve the output performance of toroidal motor, the full predictive cascade speed and current control (F-MPC) strategy for toroidal motor is proposed. For F-MPC of toroidal motor, the finite control set model predictive current control (FCS-MPCC) strategy with delay compensation is adopted in current inner loop, and the deadbeat model predictive speed control (DB-MPSC) strategy is adopted in speed outer loop. Meanwhile, to achieve DB-MPSC, the reduced-order Luenberger observer is designed to obtain load torque in real time. F-MPC is the combination of current-speed prediction and Luenberger observer; it can overcome the limitation of excessive parameter adjustment of traditional cascade PI (Proportional Integral) controller. The simulation results show that compared with FOC (Field Oriented Control) and FCS-MPCC, F-MPC can improve the dynamic response and anti-interference performance of toroidal motor, and it can also reduce the fluctuation of output speed and torque significantly.

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Section: Introductionmentioning

confidence: 99%

Full prediction cascade control of permanent magnet toroidal motor with time-varying parameters

Liu

Wang

2023

Transactions of the Institute of Measurement and Control

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“…In addition, some magnetic field model can be implemented without solving the Laplace equation. For example, the magnetic island method [22], the air gap magnetic field modulation method [23], and the threedimensional magnetic field calculation model based on the equivalent surface current of the permanent magnet [24].…”

Section: Introductionmentioning

confidence: 99%

An Improved Analytical Model of Magnetic Field in Surface-Mounted Permanent Magnet Synchronous Motor With Magnetic Pole Cutting

et al. 2021

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This paper presents an analytical model for predicting the magnetic field performance of permanent magnet synchronous motor with permanent magnet cutting. In order to satisfy the boundary conditions, the defective permanent magnet is equivalent to a double-layer sector permanent magnet, and the size of the sector-shaped permanent magnet is determined, this process is obtained by an equivalent magnetic circuit model. Then, the motor is divided into four sub-domains: inner sector permanent magnet sub-domain, outer sector permanent magnet sub-domain, air gap sub-domain and stator slot sub-domain. Under the boundary conditions, the analytical solution and harmonic decomposition of the air gap magnetic flux density and cogging torque for several different permanent magnet cutting sizes under no-load condition are obtained by solving the Poisson equation and Laplace equation with the method of separating variables. The analytical model is verified by the finite element method. The results show that the error between the analytical method and the finite element method is less than 6%, and the solution time of the analytical method is only 0.59% of the finite element method, the chamfered structure proposed in the paper reduces the cogging torque amplitude 35%. Therefore, this method can provide powerful help for the initial design of permanent magnet motors.INDEX TERMS Sub-domain model, Cutting permanent magnet, Magnetic circuit method, Magnetic flux density.

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“…The electromagnetic drive motor is suitable for low torque and high speed work, but its structure is complicated, the miniaturization is difficult, the control and positioning accuracy is low, and it is not suitable for precise work. [2][3][4][5][6] Compared with traditional electromagnetic motors, piezoelectric drive motors have many advantages, such as: low speed and large torque, no electromagnetic interference, fast response, simple structure, self-locking of power failure, etc., [7][8][9][10][11] it is widely used in micro machines, medical equipment, precision machining and aerospace. [12][13][14][15][16] But it is affected by friction materials, temperature, etc., and its life is short, which is not suitable for continuous work.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic piezoelectric hybrid driven multi-DOF motor contact model considering drive and load state

Zhao

Guo

et al. 2021

Science Progress

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This paper proposes a new research method in view of the rare research on the contact state of hybrid drive multi-degree-of-freedom motor. Firstly, the basic principle and structure of hybrid drive motor are introduced. The air gap magnetic field model and electromagnetic torque model of permanent magnet rotor are obtained by analytical method. Static analysis of piezoelectric stators are carried out by stress-strain relationship. According to the analytical method and the spatial geometric relationship, the piezoelectric driving torque under different driving conditions is obtained. Introducing Hertz contact theory and Mindlin theory, combined with piezoelectric driving torque, electromagnetic driving torque and load torque to analyze the friction situation. A friction interface model considering the dynamic nonlinearity of friction coefficient and the nonlinear change of friction force distribution is established. Finally, using Matlab software, the friction distribution diagram of the contact surface of the hybrid drive three-degree-of-freedom motor under different driving and motion states is obtained. The analysis results verify the rationality of the electromagnetic piezoelectric hybrid driven three-degree-of-freedom motor. It shows that the contact state of the three sets of piezoelectric stators are determined according to the driving condition and load, the relative speed of the piezoelectric stators and the spherical rotor is proportional to the frictional force. It provides an idea for the research of contact state of hybrid drive multi-degree-of-freedom motor, and also lays a basis for further optimizing the friction interface of this kind of motors or actuators.

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Torque Calculation of Permanent-Magnet Spherical Motor Based on Permanent-Magnet Surface Current and Lorentz Force

Cited by 24 publications

References 20 publications

Full prediction cascade control of permanent magnet toroidal motor with time-varying parameters

Full prediction cascade control of permanent magnet toroidal motor with time-varying parameters

An Improved Analytical Model of Magnetic Field in Surface-Mounted Permanent Magnet Synchronous Motor With Magnetic Pole Cutting

Electromagnetic piezoelectric hybrid driven multi-DOF motor contact model considering drive and load state

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