Research on Torque Ripple Suppression of the Slotted Limited Angle Torque Motor

Ma, Pengcheng; Wang, Qian; Li, Yong; Jiang, Shanlin; Zhao, Meng

doi:10.1109/tmag.2020.3006018

Cited by 16 publications

(5 citation statements)

References 8 publications

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“…For example, a set of typical values of DC aircraft supply is 28V and 0.8A, so the resistance of the winding, R, is basically determined. Since the open slot is adopted, the useful slot area, Aslot, and the mean turn length for the winding, lm, can be determined according to the width of the slot opening, so the number of turns of a coil, N, can be calculated by (3) given the slot fill factor, SF, and the resistivity,  [16].…”

Section: Parameter Optimizationmentioning

confidence: 99%

“…the breadth of constant torque range (CTR), and the torque output capability within the CTR are two key performance indicators of LATM, which determine the application range of LATM. The CTR of Slotted LATMs is affected by their cogging torque, so it is improved by optimizing the stator structure in [3]- [7], but very few pieces of literature are presented to improve the CTR of slotted LATMs by optimizing the rotor structure. In some areas requiring high reliability, such as aerospace, a set of backup windings is required for LATM, that is, the motor must have two sets of windings with the same capabilities but without coupling.…”

Section: Introductionmentioning

confidence: 99%

“…In some areas requiring high reliability, such as aerospace, a set of backup windings is required for LATM, that is, the motor must have two sets of windings with the same capabilities but without coupling. In references [8] and [9], two sets of windings are inserted in the same or spaced slots, but these methods reduce the torque density of slotted LATM and are unable to eliminate thermal and magnetic coupling between windings. Two independent slotless LATMs arranged axially are utilized in [10], due to the excessive axial length of the motor caused by the end winding, this method is unsuitable for slotted LATMs which have the highest torque density in LATMs.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of an Axial-Flux Slotted Limited-Angle Torque Motor with Quasi-Halbach Array for Torque Performance Improvement

Wang

2023

Trans. Electr. Mach. Syst.

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Better torque performance and higher reliability have long been the focus of research for slotted limited-angle torque motors (LATMs), which are primarily used to position first-stage valves in electrohydraulic servosystems. This paper presents a high reliability axial-flux slotted LATM with quasi-Halbach array for torque performance improvement including constant torque range (CTR) and output torque. Firstly, the structure with two sets of windings and the operation principle of the proposed slotted LATM is analyzed. Secondly, a brief design procedure is presented, the structure selections of open slot and double-stator single-rotor (DSSR) interior rotor with surface mounted quasi-Halbach permanent magnet (PM) array are illustrated, and the geometric parameters are optimized to obtain the optimal design of the proposed slotted LATM. Then, 3-D finite-element method (FEM) is employed to compare the proposed slotted LATM with the conventional surface mounted PM slotted LATM in terms of cogging torque, no-load back EMF, and output torque, and the results show that the proposed LATM with quasi-Halbach array has a 10% improvement in output torque and a 25% improvement in CTR. Meanwhile, the flux linkages and torque performance of the two sets of windings under various conditions verify good magnetic isolation. Finally, prototypes of two different rotor types are manufactured and a series of experiments are performed to validate the analysis.

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Section: Parameter Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of an Axial-Flux Slotted Limited-Angle Torque Motor with Quasi-Halbach Array for Torque Performance Improvement

Wang

2023

Trans. Electr. Mach. Syst.

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“…Several papers have proposed multiple methods for cogging torque ripple reduction, such as rotor skew, stator slot-skew, pole-arc ratio optimization, magnetic pole shift, and Auxiliary Slot on stator [6][7][8] . Rotor skew has a very strict requirement to the manufacturing technology and is considered to be uneconomic for most clients on public transportation.…”

Section: Introductionmentioning

confidence: 99%

Surrogate-based auxiliary slot optimization for a fractional slot IPM machine used in the public transportation

Wang

Yang

Ding

et al. 2023

International Conference on Electronic Information Engineering and Computer Science (EIECS 2022)

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This paper focuses on the application of electrical machines in public transportation and investigates the potential benefits of auxiliary slot design on this kind of high-speed low torque machine. A preliminary surrogate-based optimization is conducted to the shape of auxiliary slots on the stator for minimizing its cogging torque ripple while maintaining its Total Harmonic Distortion (THD) at an acceptable level. The results show the optimization achieves its best performance while the edges of the auxiliary slot are parallel to the edges of the stator teeth, which could reflect a deeper resonance among the geometries of the stator magnetic field.

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“…In [15], a low-speed and high-torque dual-stator permanent magnet direct drive motor was proposed, which could improve the torque density at the same the motor volume. In [16], various cogging torque suppression methods were proposed, the relationship between cogging torque and structural parameters was derived by formulas and the torque distortion caused by armature reaction force was predicted. In [17], a permanent magnet slotting machine with a special tooth tip structure was introduced, which could effectively reduce magnetic leakage and armature reaction to improve motor performance, while [18] proposed a technique to increase torque density by changing the shape of the permanent magnet with the minimum magnet volume.…”

Section: Introductionmentioning

confidence: 99%

Research on a Limit Analytical Method for a Low-Speed Micro Permanent Magnet Torque Motor with Back Winding

et al. 2022

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The conventional permanent magnet torque motor (PMTM) is slotted on the inner surface of the stator core. When the size of the stator core is small, the winding coils are difficult to embed into the slots. To solve the problem, a novel PMTM is presented, which is slotted on the outer surface of the stator core. As a result, the winding coils can be conveniently embedded into the slots from the outer surface of the stator core. The novel structure of the PMTM with back winding (BWPMTM) is introduced, and the advantage of the novel structure is analyzed. Furthermore, this paper proposes a limit analytical method to solve the optimal parameters of the motor which comprehensively considers four constraints: no-load back electromotive force (EMF), torque, temperature and slot space factor. The optimal parameters of the motor are directly solved to maximize torque density within the constrained range. This method avoids repeated iterative processes and greatly reduces the amount of calculation for PMTM design. Electromagnetic performance and thermal performance are analyzed based on the finite element model (FEM). Finally, the building of a prototype and the experimental results obtained with it are discussed. The rationality of the novel structure and the limit analytical method are verified.

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Research on Torque Ripple Suppression of the Slotted Limited Angle Torque Motor

Cited by 16 publications

References 8 publications

Analysis of an Axial-Flux Slotted Limited-Angle Torque Motor with Quasi-Halbach Array for Torque Performance Improvement

Analysis of an Axial-Flux Slotted Limited-Angle Torque Motor with Quasi-Halbach Array for Torque Performance Improvement

Surrogate-based auxiliary slot optimization for a fractional slot IPM machine used in the public transportation

Research on a Limit Analytical Method for a Low-Speed Micro Permanent Magnet Torque Motor with Back Winding

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