Principle and Analysis of Radial-Force-Based Swirling Actuator for Low-Speed High-Torque Applications

Chen, Lingyu; Thabuis, Adrien; Fujii, Yusuke; Chibá, Akira; Nagano, Masao; Nakamura, Kimiaki

doi:10.1109/tia.2022.3142118

Cited by 4 publications

(12 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The principle of the proposed swirling actuator was verified in our previous paper [22], however, we could only achieve a peak torque density of 27 Nm/L with a small volume of 0.16 L. In contrast, the direct-drive PM machines with similar volumes of 0.1-0.2 L have the peak torque densities up to 37.7 Nm/L [7]- [11]. In this paper, the peak torque density of the swirling actuator is improved to 64 Nm/L with the identical volume of 0.16 L. The target applications of the swirling actuator are robotic joints and wearable rehabilitation devices which operate at very low speeds and require high torque densities with compact sizes.…”

mentioning

confidence: 70%

“…The calculation of the gear center distance is introduced in the Appendix. In our previous paper [22], the nominal gear center distance was 0.5 mm. Thus, 𝑟𝑟 0 is also set as 0.5 mm in this paper.…”

Section: Basic Structure and Operation Principlementioning

confidence: 99%

“…However, in the real design, PMs thinner than 1 mm are avoided due to the fabrication difficulty and possible irreversible demagnetization. In [22], the design point was at 𝑡𝑡 𝑚𝑚 = 2 mm and 𝑔𝑔 0 = 1 mm. In this paper, g 0 = 0.6 mm and 𝑡𝑡 𝑚𝑚 = 1 mm are selected.…”

Section: Enhancement Of Electromagnetic Radial Forcementioning

confidence: 99%

“…The machine volume was 5 L and the calculated and measured peak torque densities were 114 Nm/L and 94.4 Nm/L, respectively. The proposed swirling actuator is driven by the electromagnetic radial force which leads to the circular motion of the swirler [22]. The identical motion can be found in several special cycloidal motors.…”

mentioning

confidence: 97%

“…In [24], the external rotating magnetic fields generate the circular motion. Involute-type mechanical gears were integrated in [22]- [24] to convert the circular motion into low-speed rotation. The gear mechanism is identical to that of cycloidal drives.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Torque Density Improvement of a Low-Speed High-Torque Swirling Actuator Driven by Electromagnetic Radial Force With Integrated Mechanical Gears

Chen

Fujii

Chibá

2023

IEEE Open J. Ind. Applicat.

View full text Add to dashboard Cite

The torque density improvement of a low-speed high-torque swirling actuator is presented in this paper. The swirling actuator is driven by the electromagnetic radial force and integrated mechanical gears. The electromagnetic radial force generates the circular motion of the swirler which is converted into the low-speed rotor rotation by the mechanical gears. Firstly, the dimensions of the swirler with 12-pole permanent magnets are optimized to enhance the electromagnetic radial force by analytical calculation and 3-D finite element analysis. Secondly, an improved gear set with a reduced pressure angle and an increased transmission ratio is designed. The gear efficiency and torque are investigated analytically considering the friction loss. Two prototypes are designed, and the experimental results exhibit that the peak torque density is improved from 27 to 64 Nm/L with a small volume of 0.16 L.

show abstract

mentioning

confidence: 70%

Section: Basic Structure and Operation Principlementioning

confidence: 99%

Section: Enhancement Of Electromagnetic Radial Forcementioning

confidence: 99%

mentioning

confidence: 97%

mentioning

confidence: 99%

See 3 more Smart Citations

Torque Density Improvement of a Low-Speed High-Torque Swirling Actuator Driven by Electromagnetic Radial Force With Integrated Mechanical Gears

Chen

Fujii

Chibá

2023

IEEE Open J. Ind. Applicat.

View full text Add to dashboard Cite

show abstract

Normal force calculation of two-degree-of-freedom direct drive induction motor considering coupling effect

Nie

Meng

Wang

et al. 2023

COMPEL

View full text Add to dashboard Cite

Purpose The purpose of this study is to calculate the normal force of a two degree of freedom direct drive induction motor considering coupling effects based on an analytical model. Compared with the traditional single degree of freedom motor, normal force characteristics of two-degree-of-freedom direct drive induction motor (2DOFDDIM) is affected by coupling effect when the machine is in a helical motion. To theoretically explain the influence mechanism of coupling effect, this paper conducts a quantitative analysis of the influence of coupling effect on normal force based on the established analytical model of normal force considering coupling effect. Design/methodology/approach Firstly, the normal forces generated by 2DOFDDIM in linear motion, rotary motion and helical motion are investigated and compared to prove the effect of the coupling effect on the normal force. During this study, several coupling factors are established to modify the calculation equations of the normal force. Then, based on the multilayer theoretical method and Maxwell stress method, a novel normal force calculation model of 2DOFDDIM is established taking the coupling effect into account, which can easily calculate the normal force of 2DOFDDIM under different motions conditions. Finally, the calculation results are verified by the results of 3D finite element model, which proves the correctness of the established calculating model. Findings The coupling effect produced by the helical motion of 2DOFDDIM affects the normal force. Originality/value In this paper, the analytical model of the normal force of 2DOFDDIM considering the coupling effect is established, which provides a fast calculation for the design of the motor.

show abstract

Principle and Analysis of Structure of Low-Speed High-Torque Gear Meshing Motor Driven by Radial Force

Yu,

Sun,

et al. 2024

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Principle and Analysis of Radial-Force-Based Swirling Actuator for Low-Speed High-Torque Applications

Cited by 4 publications

References 19 publications

Torque Density Improvement of a Low-Speed High-Torque Swirling Actuator Driven by Electromagnetic Radial Force With Integrated Mechanical Gears

Torque Density Improvement of a Low-Speed High-Torque Swirling Actuator Driven by Electromagnetic Radial Force With Integrated Mechanical Gears

Normal force calculation of two-degree-of-freedom direct drive induction motor considering coupling effect

Principle and Analysis of Structure of Low-Speed High-Torque Gear Meshing Motor Driven by Radial Force

Contact Info

Product

Resources

About