Influence of magnetic reluctances of magnetic elements on servo valve torque motors

Liu, Changhai; Jiang, Hongzhou

doi:10.3901/cjme.2015.1204.142

Cited by 16 publications

(16 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Liu et al proposed a novel mathematical model of torque motors. From the comparisons of results, the magnetic reluctances of the magnetic elements cannot be neglected if the permeability is small [29]. Zhu et al proposed a set of theoretical models to describe the entire magnetization and demagnetization process of torque motors [30].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Characteristics of a Novel Torque Motor Based on an Annulus Air Gap

et al. 2021

View full text Add to dashboard Cite

Although a two-dimensional (2D) valve has excellent performance, the processing of its spiral groove has a high cost and is time-consuming. This paper proposes a novel torque motor based on an annulus air gap (TMAAG) to replace the negative feedback function of the spiral groove to reduce the machining difficulty. In order to study the torque change law of the TMAAG, the air gap permeance was analyzed, and then a qualitative analytical model was established. Orthogonal tests were carried out to initially select the crucial parameters, which were further optimized through a back propagation (BP) neural network and genetic algorithm. The prototype of TMAAG was machined, and a special experimental platform was built, and experiment results are similar to the simulation values, which verifies the accuracy of the air gap analysis and qualitative model. For torque-angle characteristics, the output torque increases with both current and rotation angle and reaches about 0.754 N·m with 2 A and 1.5°. While for torque-displacement characteristics, due to the negative feedback mechanism, the output torque decreases with increasing armature displacement, which is about 0.084 N·m with 2 A and 1 mm. The research validates the unique negative feedback mechanism of the TMAAG and indicates that it can be potentially used as an electro-mechanical converter of a 2D valve.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation of Characteristics of a Novel Torque Motor Based on an Annulus Air Gap

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Due to the lack of the integrated design method, the rapid design method of power station valves exists some shortages, and it is not suitable for the current fast response design requirements of nuclear valves. Hence, it has become the key factor in improving the designing quality for the safety performance and shortening the research cycle of power station valves [1][2][3]. Therefore, developing the rapid design method for safety performance of the power station valves has important theoretical significance and practical value.…”

Section: Introductionmentioning

confidence: 99%

“…As the progress of nuclear power industry, power valve products are in the period of rapid development, and the requirements of high performance, low cost and short cycle are put forward to the design of nuclear power valves, so advanced digital design methods and integrated design system provide technical support in urgent need [1][2][3][4]. Especially under leakage of nuclear power station in Japan, there is important realistic significance to improve design ability of nuclear power valves and product performance.…”

Section: Introductionmentioning

confidence: 99%

Integrated Design Method and Experimental Study for the Safety Performance Analysis of Nuclear Power Valve

Dai¹,

Nai-Qun²,

Liu³

et al. 2016

IJCA

View full text Add to dashboard Cite

show abstract

“…Urata et al [12] analyzed the influence of an unequal thickness of air gaps on the torque output in servo valve torque motors and presented how an imbalance of air gaps changes the flux density and the resultant torque characteristics. Liu et al [1] analyzed the influence of the reluctance of magnetic elements on the torque motor. Considering the magnetic reluctance, a mathematical model of a servo valve torque motor was developed on the basis of the fundamental laws of electromagnetism.…”

Section: Introductionmentioning

confidence: 99%

“…These directly affect the output performance of servo valves [1][2][3][4][5]. Some research has been conducted on the dynamics and control of hydraulic torque motors.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field and Torque Output of Packaged Hydraulic Torque Motor

et al. 2018

View full text Add to dashboard Cite

Hydraulic torque motors are one key component in electro-hydraulic servo valves that convert the electrical signal into mechanical motions. The systematic characteristics analysis of the hydraulic torque motor has not been found in the previous research, including the distribution of the electromagnetic field and torque output, and particularly the relationship between them. In addition, conventional studies of hydraulic torque motors generally assume an evenly distributed magnetic flux field and ignore the influence of special mechanical geometry in the air gaps, which may compromise the accuracy of analyzing the result and the high-precision motion control performance. Therefore, the objective of this study is to conduct a detailed analysis of the distribution of the magnetic field and torque output; the influence of limiting holes in the air gaps is considered to improve the accuracy of both numerical computation and analytical modeling. The structure and working principle of the torque motor are presented first. The magnetic field distribution in the air gaps and the magnetic saturation in the iron blocks are analyzed by using a numerical approach. Subsequently, the torque generation with respect to the current input and assembly errors is analyzed in detail. This shows that the influence of limiting holes on the magnetic field is consistent with that on torque generation. Following this, a novel modified equivalent magnetic circuit is proposed to formulate the torque output of the hydraulic torque motor analytically. The comparison among the modified equivalent magnetic circuit, the conventional modeling approach and the numerical computation is conducted, and it is found that the proposed method helps to improve the modeling accuracy by taking into account the effect of special geometry inside the air gaps.

show abstract

Influence of magnetic reluctances of magnetic elements on servo valve torque motors

Cited by 16 publications

References 13 publications

Investigation of Characteristics of a Novel Torque Motor Based on an Annulus Air Gap

Investigation of Characteristics of a Novel Torque Motor Based on an Annulus Air Gap

Integrated Design Method and Experimental Study for the Safety Performance Analysis of Nuclear Power Valve

Magnetic Field and Torque Output of Packaged Hydraulic Torque Motor

Contact Info

Product

Resources

About