Design and analysis of magnetically-drive actuator applied for linear compressor

Tsai, Nan-Chyuan; Chiang, Chi-Wu

doi:10.1016/j.mechatronics.2010.06.001

Cited by 37 publications

(14 citation statements)

References 26 publications

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“…The root mean square (RMS) of the applied current under ISMC is about 3.5 A. It is noted that the MLA does not require any inverter to generate the sinusoidal current but a constant stroke can be easily achieved [25]. The reason for this behaviour is that, generally speaking, the inverter is mainly used to generate sinusoidal current for reciprocal motion.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…That is, the rod is driven to move axially in a sine-wave fashion as long as the EM poles (a total of seven EM poles in the present work) are energized by a direct current, with no need of inverters. On the other hand, the stroke is fixed once the number of PMs (i.e., the length of the Halbach array) and the number of EM poles encircling the drive rod are both fixed [25]. In addition, the linear power amplifier is employed to implement the control commands for retaining the expected stroke and rod position regulation.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…This will be addressed later in the controller design section. On the other hand, the magnetic linear actuator (MLA) was employed to drive the rod of the linear compressor in the authors' previous work [25]. Therefore, the axial thrust magnetic force exerted on the rod can be described as follows [25] …”

Section: Dynamic Modelling Of a Magnetically Levitated Linear Compressormentioning

confidence: 99%

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Innovative linear compressor by magnetic drive and control

Tsai

Chiang

2011

Proceedings of the Institution of Mechanical Engineers, Part I:

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A mathematical model for the magnetically levitated linear compressor (MLLC), which consists of a magnetic linear actuator, a pair of active magnetic bearings (AMBs), and a drive rod, has been developed. To prevent any potential wear or collision by the drive rod against conventional bearings, and certainly to reduce noise, the AMB pair is employed to regulate the lateral position deviation of the drive rod. The integral sliding mode control (ISMC) is synthesized to account for displacement-dependent system parameters and input non-linearities for the MLLC system. In addition, the closed-loop stability, under the presence of the reaction force by gas in the chamber, is proven by the Lyapunov direct method. Finally, the efficacy of the ISMC is verified by intensive computer simulations to ensure its superior regulation capability for lateral position deviation on the drive rod, retention of constant stroke of the piston, and counterbalance against the reaction force by gas during the Otto cycle.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Dynamic Modelling Of a Magnetically Levitated Linear Compressormentioning

confidence: 99%

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Innovative linear compressor by magnetic drive and control

Tsai

Chiang

2011

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…1. The plungertype structure is intended to produce small size [19] and [20]. When the coil is energized by DC voltage, the plunger of the valve retracts upward and extends downwards by releasing the stored energy from the spring.…”

Section: Subsea Solenoid Valvementioning

confidence: 99%

Probabilistic Thermal and Electromagnetic Analyses of Subsea Solenoid Valves for Subsea Blowout Preventers

Cai¹,

Y²,

Ren³

et al. 2012

SV-JME

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A prototype of subsea solenoid valve for subsea blowout preventers is designed and manufactured. The deterministic and probabilistic thermal and electromagnetic finite element analyses are performed by using ANSYS software. The effects of uncertainties of five material properties, four physical dimensions and an applied voltage on the maximum temperature within the valve and the electromagnetic force with a given air gap are researched by means of Monte Carlo simulation (MCS) and response surface method (RSM). The thermal and electromagnetic experiments were done to validate the finite element analysis results. The results show that the radius of magnetic ring, applied voltage and thermal conductivity of 440C stainless steel have significant effects on the maximum temperature of subsea solenoid valve. The radius of plunger and inside radius of plunger sleeve have significant effects on the electromagnetic force of subsea solenoid valve. The results of finite element analysis and thermal and electromagnetic experiments indicate good matches. Therefore, the probabilistic finite element analysis shows its advantages in improving the development process and performance of subsea solenoid valves.

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“…10,11 In both cases, the linear motor is integrated into a free-piston compressor and features two active magnetic bearings to compensate for the radial motor and gravity forces. The theory underlying magnetic levitation of systems with singlephase characteristics can be found in Silber and Amrhein.…”

Section: Introductionmentioning

confidence: 99%

Active bearing force reduction in non-commutated linear actuators

Poltschak

2016

Proceedings of the Institution of Mechanical Engineers, Part I:

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Planar linear magnetic actuators are used in a wide range of industrial applications. Permanent magnet movers in particular allow high axial thrust forces, which result in considerable destabilizing stiffness in the direction perpendicular to the direction of motion. These forces, which can reduce bearing lifetime significantly, must therefore be stabilized with linear bearings. This paper introduces an integrated active bearing-force compensation concept that minimizes the forces acting on the mechanical bearings. The potential and limits of bearing force compensation are analyzed based on a short-stroke linear actuator with an E-shaped stator. Further, the extent to which bearing forces can be compensated for, even with simple actuator layouts, is described. Particularly in linear oscillating drives, such compensation can (i) significantly reduce wear and thus improve lifetime and (ii) reduce the size of mechanical bearings. Measurements of a prototype system confirm the simulated results.

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Design and analysis of magnetically-drive actuator applied for linear compressor

Cited by 37 publications

References 26 publications

Innovative linear compressor by magnetic drive and control

Innovative linear compressor by magnetic drive and control

Probabilistic Thermal and Electromagnetic Analyses of Subsea Solenoid Valves for Subsea Blowout Preventers

Active bearing force reduction in non-commutated linear actuators

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