Theoretical and experimental investigation on novel 2D maglev servo proportional valve

Meng, Bin; Xu, Hao; Ruan, Jian; Li, Sheng

doi:10.1016/j.cja.2020.12.004

Cited by 24 publications

(12 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hydraulic pumps are developing towards high speed, miniaturization and energy saving [11,12]. Therefore, Ruan's team proposed a novel piston pump with a design based on the "two-dimensional" concept [13][14][15], which has a single piston [16][17][18] and double rotor type [19][20][21]. The 2D piston pump with a balanced force uses the rolling friction of the roller-guide-rail mechanism instead of the sliding friction of the swash plate-slippers mechanism.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Mechanical Efficiency Models for 2D Piston Pumps with a Stacked Taper Roller Set

et al. 2022

Self Cite

View full text Add to dashboard Cite

Since the clearance between the guide rail and the roller reduces the efficiency of the 2D pump, this paper proposes a novel 2D piston pump with stacked taper roller sets to eliminate the effect of the clearance. The structure of the 2D pump is introduced, and the mathematical model of the torque and the mechanical efficiency of the bilateral force on the guide rail are established and analyzed. The model takes into account the change in the oil viscosity, the spatial angle and the oil churning loss. A test rig was built to test the mechanical efficiency under different operating conditions. The unilateral and bilateral force models of the guide rail were compared, which proved that the bilateral force model of the guide rail can predict the mechanical efficiency more accurately than the unilateral force model. In the case of high load pressure, there was a clearance between the test results and the model calculation results. It is speculated that the main reason for this is that the greater oil pressure causes the size of the contact area between the two taper rollers and between the taper roller and the guide rail to become larger. The resulting rolling friction coefficient becomes larger, which affects the mechanical efficiency.

show abstract

Section: Introductionmentioning

confidence: 99%

Optimization of Mechanical Efficiency Models for 2D Piston Pumps with a Stacked Taper Roller Set

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Meng et al proposed a novel twodimensional magnetically levitated servo-proportional valves (2D-MSP valve), where a contactless magnetically levitated coupling is introduced to maintain the advantages of the 2D valve which greatly reduces the manufacturing cost. 22 Working stability is a top consideration for the design of the hydraulic control valve and system. Linear control theory and the Routh criterion are widely used to determine the stability of various valves.…”

Section: Introductionmentioning

confidence: 99%

“…Meng et al proposed a novel two-dimensional magnetically levitated servo-proportional valves (2D-MSP valve), where a contactless magnetically levitated coupling is introduced to maintain the advantages of the 2D valve which greatly reduces the manufacturing cost. 22…”

Section: Introductionmentioning

confidence: 99%

Novel resonance stability criterion for the 2D magnetically levitated servo-proportional valve

Meng

Zhu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

View full text Add to dashboard Cite

The leakage of the pilot stage of the 2D valve mainly depends on the size of its initial opening. According to the Routh criterion, the pilot stage of the two-dimensional magnetically levitated servo-proportional valve (2D-MSP valve) needs to be designed to have certain positive values to increase the damping ratio to improve valve stability, which leads to the leakage flow representing a non-negligible power loss. In order to reduce leakage flow and achieve goal of energy saving, this paper presents a novel resonance stability criterion by considering nonlinear characteristics of the fluid dynamic system. First, the 2D-MSP valve is regarded as a three-way valve-controlled differential cylinder system. Based on the frequency response of the resonance state, the energy conservation method is used to solve the flow “backfilling” area, the motion equation of the cylinder piston (valve spool displacement) and the pressure waveform of the sensing chamber under different opening and pressure amplitude ratio. Then, the analytical expression of the resonance peak amplitude is obtained and the resonance stability criterion is deduced. The result is compared with the Routh stability criterion, which illustrates that the positive openings of the pilot stage can be reduced to one-third of the original value. The prototype valve is then designed and manufactured based on the resonance stability criterion. The dynamic and static characteristics under different system pressures are measured. Experimental results show that the prototype valve is an over-damped system without any overshoot, which has excellent working stability, and its static and dynamic performance can meet the demands of the industry servo-proportional control system. The research work validates the effectiveness of the proposed resonance stability criterion.

show abstract

“…With the integration of the servo valve and proportional valve, so-called industrial servo valves have emerged, which use high-performance linear force motors to directly drive the valve and incorporate a linear variable differential transformer (LVDT) sensor to form a closed-loop control of the spool position [7,8]. Compared with the proportional valve, it has better static and dynamic response while retaining stability and simplicity [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

Self Cite

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

Theoretical and experimental investigation on novel 2D maglev servo proportional valve

Cited by 24 publications

References 22 publications

Optimization of Mechanical Efficiency Models for 2D Piston Pumps with a Stacked Taper Roller Set

Optimization of Mechanical Efficiency Models for 2D Piston Pumps with a Stacked Taper Roller Set

Novel resonance stability criterion for the 2D magnetically levitated servo-proportional valve

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

Contact Info

Product

Resources

About