Overview of 2-Degree-of-Freedom Rotary-Linear Motors Focusing on Coupling Effect

Xie, Lujia; Si, Jikai; Hu, Yihua; Wang, Zhen

doi:10.1109/tmag.2019.2898609

Cited by 30 publications

(11 citation statements)

References 54 publications

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“…where u im and u jm denote the amplitudes of the i-th and j-th harmonics, θ i and θ j denote the initial position of primary. The resultant windings voltage of two sub-areas can be calculated by adding (7) and (8):…”

Section: B Ripple Suppression Principle Of Proposed Schemementioning

confidence: 99%

“…In recent years, many experts have studied the new topologies and mechanisms [7]- [9], electromagnetic design [10]- [12], advanced control methods [13]- [15] and fault diagnosis [16]- [18] on special electrical machines, all of which are mainly focused on improving performance and reducing costs. Consequent pole (CP) arrangement for PM motor is that one PM pole is set between two salient ferromagnetic iron poles and saves half the number of PM poles, thereby reducing motor costs.…”

Section: Introductionmentioning

confidence: 99%

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Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Sun

et al. 2020

IEEE Access

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Permanent magnet linear synchronous motors (PMLSM) has the advantages of high speed, high thrust density, high power density, high power factor and high reliability. In order to save permanent magnet (PM) materials and reduce magnetic leakage, a new type of PMLSM with Halbach consequent-pole (HCP) structure is presented, which has great potential for application to the ropeless elevator system. By using extensive finite element analysis (FEA), the electromagnetic properties of the proposed HCP-PMLSM, including magnetic field, back electromagnetic force (back-EMF), thrust force and cogging force are simulated and compared with the consequent pole PMLSM (CP-PMLSM) and surface-mounted pole PMLSM (SP-PMLSM). The comparison results show that the proposed HCP configuration can reduce substantial PM material and increase the air-gap magnetic field effectively. Then, the influence trend of HCP parameters such as pole thickness, pole width ratio, auxiliary PM width and magnetism angle, are studied and analyzed for evaluating the output performance in HCP-PMLSM. On this basis, Response surface method (RSM) is employed to optimize the HCP parameters with the target of maximum average thrust, minimum thrust ripple, and highest PM utilization. Furthermore, a double-sided pole shift method was proposed to significantly suppress the thrust fluctuation of HCP-PMLSM. Lastly, experimental results are provided to verify the investigation.

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Section: B Ripple Suppression Principle Of Proposed Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Sun

et al. 2020

IEEE Access

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“…Therefore, employing a position sensor for simultaneous detecting position in both DOF reduces the complexity and volume of the control system [2]. Therefore, for the control of 2-DOF electrical machines in different applications, such as industrial and medical field robots [3], drilling [4], industrial production [5], ship propulsion [6], artillery turrets, and aerospace vehicles, 2-DOF position sensors are recommended. Considering the intrinsic future of resolvers, such as good accuracy in polluted environments [7,8] and robust performance in applications with wide temperature variation and vibration [9], resolvers are good candidate for 2-DOF position sensors.…”

Section: Introductionmentioning

confidence: 99%

Improving the performance of helical motion resolver based on accurate modelling of longitudinal end effect

Zare

Nasiri‐Gheidari

2022

IET Electric Power Appl

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Using multiple position sensors in the control system of Two-Degrees of Freedom (2-DOF) motors causes it more complicated than that of conventional 1-DOF ones. However, employing a 2-DOF position sensor in comparison with two independent sensors, reduces the complexity, mass and volume of the system. The common 2-DOF sensors are able to determine the position in linear, rotational, and helical motion. Yet, they suffer from accuracy reduction due to the longitudinal end effect. Therefore, analytical modelling and the relevant compensation methods are discussed. The accuracy of the model is approved by comparing its results with those of 3D time transient finite element method. Afterwards, the model is used for compensating the end effects. Finally, the optimised 2-DOF resolver is prototyped and tested. The result of experimental test shows the proposed resolver's success.

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“…Upon the implementation of this integrated machine concept, a more compact design can be obtained. Traditionally, the first RL machine was investigated in [4], which is a decoupled-flux RL machine. In this type of RL machine, the magnetic field of linear motion and rotary motion are isolated.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Two Degree-of-Freedom Rotary-Linear Machines With Permanent-Magnet Mover for High Dynamic Performance

Cai

Zhou

et al. 2022

IEEE Access

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This paper analyzes and evaluates various topologies of yokeless rotary-linear (RL) machine with permanent-magnet (PM) mover targeting for the achieving high dynamic performance. For the conventional yokeless RL machines, the single-stator topology features limited slot area for armature winding excited for both motions, and the coupled magnetic fields of both motions requires complex control strategy. In order to mitigate these issues, a double-stator RL machine with hybrid PMs array, which adopts the PMs with six magnetization directions, is proposed in this paper. An improved PMs array is introduced for the double-stator topology to achieve decoupled control for both motions. In addition, an analytical model of the radial flux density is derived to reveal the characteristics of the magnetic fields in different topologies. The parametric studies towards key dimensions are conducted to provide design guidelines and obtain the optimal design. Finally, the electromagnetic performances of the proposed design are compared systematically with the conventional single-stator counterparts. It is revealed that the proposed topology can enhance the performances in both motions, namely rotary and linear motions.

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Overview of 2-Degree-of-Freedom Rotary-Linear Motors Focusing on Coupling Effect

Cited by 30 publications

References 54 publications

Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Improving the performance of helical motion resolver based on accurate modelling of longitudinal end effect

Comparative Study of Two Degree-of-Freedom Rotary-Linear Machines With Permanent-Magnet Mover for High Dynamic Performance

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