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Original data of tubular linear motor design

Original data of tubular linear motor design

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Percussive-rotary drilling is an effective method for the hard rock drilling. As hydraulic and pneumatic hammers have many problems especially in the deep core drilling, a new electromagnetic hammer driven by a tube linear motor is introduced in this study. The study mainly covers the mechanical structure and electromagnetic design of the hammer, r...

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... main parameters in the simulation are selected in Tables 3 and 4. Therefore, the curve of magnetic field of motor and thrust changing of liner motor along with time can be obtained. ...

Citations

... e mathematical modeling of the DTH hammer is mainly based on a one-dimensional gas flow equation of state, energy conservation equation, continuous equation in the front and rear chambers, and piston motion differential equation [23][24][25]. e piston movement distance can be calculated by selecting the time step, and the state parameters in each time step can be regarded as those in a quasi-static process ( Figure 4). ...
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Although pneumatic down-the-hole (DTH) hammers have good performance of high penetration rate and minimal deviation tendency in the vertical section of oil and gas wells, they have not been successfully used in directional drilling due to drill tool wear and wellbore disturbance. Herein, we developed a novel type of pneumatic DTH hammer with a self-propelled round bit to overcome the technical difficulties of directional drilling. Nonlinear dynamic modeling developed by the authors was used to analyze the working principle and performance of the novel DTH hammer. The kinematics and dynamics simulation of this hammer were carried out using MATLAB language, and the motion law of the piston was revealed. The performance of the novel hammer was numerically simulated and evaluated by considering fluctuations of the front and rear chamber pressure, impact energy, acceleration, and frequency. The results show that our novel DTH hammer’s working principle is feasible and has an adequate structural design. The simulation results demonstrate reasonable design parameters. Compared to the numerical results for conventional DTH hammers, the velocity and acceleration of the piston of the novel hammer changed smoothly. The frequency was slightly higher than that of conventional hammers, while other parameters were nearly equal. The novel DTH hammer can be used in directional drilling, trenchless drilling, and seabed sampling drilling.
... For rock fracture or driving of steel pipes in soil in the mining and construction industries, percussion machines with hydraulic, electric and pneumatic drives are used [3][4][5]. Pneumatic percussion machines feature simple design and reliable operation. In the construction industry, vertical driving of steel pipes with a diameter to 426 mm in soil to a depth of 15-20 m is implemented using double action air impact hammers (Typhoon-500, M-400) with a blow energy to 4000 J. ...
... Modeling of the operating cycle used the input parameters from the set ranges: absolute pressure in the pressure line of 0.6-1.2 MPa; blow energy of 4-8 kJ; blow velocity of 4-6 m/s; piston weight of 600 kg; piston travel to 1400 mm; area of the pressure line of 5.3-8.5 cm 2 , body diameter to 400 mm. Figure 2 shows the design models of the construction diagram with the main elements (Figure 2a), generalized pneumatic connections (Figure 2b) and mechanical connections of forces and impacts between the movable elements (m 1 , m 2 ) and the body m 3 (Figure 2c). Figure 3 presents the operating cycle diagrams for the efficient design variables: m 1 = 600 kg, m 2 = 7 kg, S 21 = 583 cm 2 , S 12 = S 22 = 200 cm 2 , S 41 = 779 cm 2 , J pl0 = J 01 = 5.3 cm 2 (8.5 cm 2 ), J 4а = 210 cm 2 , V 0 = 22670 cm 3 , V 1 = 5800 cm 3 , V 2 = 6690 cm 3 , V 3 = 2700 cm 3 . The diagrams prove the efficient operation of the machine since the operating cycle is stable, the power stroke of the piston is performed by gravity, the back run of the piston takes place under the power chamber pressure, and the plate valve acts promptly before the exhaust. ...
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The author presents and justifies a construction diagram of a gravity-type pneumatic percussion machine for drain hole drilling with efficient penetration of casing in soil. The working cycle parameters of the machine, efficient design variables, as well as the blow energy, blow frequency and compressed air flow rate depending on the line pressure are determined by the numerical modeling. The weight, size and dynamics of the gravity-type machine are compared with the known analogous facilities.
... The one is to use the basic excitation technique to get the estimated rotational speed and position using back EMF which produced by the PM. And the other approach is based on the saliency tracking technique, and it injects the persistent high-frequency signals by using the rotor anisotropy, thus getting the position information [6]- [8]. ...
Article
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In the vector control system of the tubular oscillatory linear permanent magnet (PM) synchronous motor (LPMSM), it is difficult for traditional mechanical sensors to accurately obtain the feedback information under harsh conditions. In this work, a speed sensorless vector control system is designed and applied to the tubular oscillatory LPMSM which adopts the model reference adaptive system (MRAS), and the deadbeat current predictive control (DCPC) is also adopted to replace the traditional PI current loop to establish the coordination controller, which overcomes the difficulties of global optimization and PI control parameter setting. And the method is proved by the simulation results and it gets better dynamic performance.
... Permanent magnet linear synchronous motors (PMLSMs) have the advantages of simple structure, high thrust density, high positioning accuracy, high speed, high acceleration and so on. They have wide application prospects in the field of high precision linear motion control [1][2][3]. However, the structure of the linear motor has its particularity of open primary core that leads to a large end effect. ...
Article
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In order to improve the performance of the linear motor system, it is necessary to adopt a simple motor structure and effective optimisation method to reduce the detent force without decreasing the average thrust. A 16‐pole 18‐slot two‐sectional modular permanent magnet linear synchronous motor (PMLSM) is investigated in this study, in which the primary core is divided into two modules and coupled with the secondary, forming two sections. It is found that the modular distance between the two sections affects the detent force and back‐electromotive force of the whole motor. Thus, the characteristics of the detent force and the categories of the winding arrangements are analysed. The modular distance of 4τ/9 is chosen after analysis and comparison. To further suppress the detent force and improve the average thrust, a new end tooth structure including different wide and narrow tooth is proposed, which is set at the ends of each section's primary core. The design method of the end tooth parameters is obtained by theoretical derivation and the optimisation efficiency of end tooth parameters is further improved by layered optimisation design. Finally, the experiments on the 16‐pole 18‐slot PMLSM validate the correctness and feasibility of the proposed modular motor structure.
... Due to the manufacturing complexity of the tubular laminated core, the tubular coreless LPMSM (without slots) is an economic and commonly used type, which has advantages of zero detent force, light weight and high acceleration performance [6], [7]. It also has no lateral edge effect that exists in the flat one and it is very suitable for some cylindrical applications such as linear compressors, electric power switch plunger solenoids [4], and electromagnetic hammer [8], [9]. ...
... Although many new algorithms for multi-objective evolutionary computation have emerged in solving engineering problems recently, they have rarely been applied in electrical machines in previous publications. The primary purpose of this paper is to apply AMOBH algorithm to achieve effective multi-objective optimization of a tubular coreless LPMSM used in drilling project [8]. To simplify and reduce the calculations of MOEAs, we present a one-layer AM of the tubular coreless LPMSM in this paper. ...
... To replace the hydraulic or pneumatic hammer in the drilling project, the coreless tubular LPMSM was developed as a new application in petroleum and geological engineering [8]. Due to the special application conditions, the outer diameter of the hammer is limited less than 90 mm (drill pipe's passing diameter). ...
Article
In most multi-objective optimization problems of electrical machines, the weighted function method is used to convert them into single-objective optimization problems. This paper applies a kind of new multi-objective evolutionary algorithms (MOEAs), called adaptive multi-objective black hole (AMOBH) algorithms, to achieve effective multi-objective optimization of a tubular coreless linear permanent magnet synchronous motor (LPMSM). To reduce the computation cost of the MOEAs, a one-layer analytical model (AM) is presented for the tubular coreless LPMSM in this paper. The accuracy of the simplified one-layer AM is verified by comparisons with multi-layer AM and finite element analysis (FEA) under different structure parameters. It is found that the simplified AM has good accuracy and can decrease the computation cost significantly. AMOBH algorithm is subsequently introduced. The optimal Pareto front with regard to thrust, copper loss and permanent magnet volume are analyzed, and more diversified optimization results are provided. The final Pareto solution can be selected directly by practical physical values according to the application requirements. Finally, a prototype is fabricated for the selected design; its experimental results are provided and compared with those of the FEA results.
... Currently, the technologies of linear motor have become very mature, whose advantages have been brought into full play in fields where traditional electric rotating machinery cannot be applied [11][12][13][14]. Currently, various enterprises have mature linear motor products, such as Anorad, Danaher, Aerotech from the USA, Siemens, Rexroth, Trumpf from Germany and Mitsubishi, Fanuc, Sanyo from Japan. ...
Article
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The iron loss of inner yoke accounts for the majority of iron loss of an electromagnetic linear actuator (ELA). Therefore, the reduction of iron loss of inner yoke is of great importance to the reduction of iron loss of the whole ELA. This study investigates the formation mechanism and distribution law of ELA iron loss and proposes a reduction scheme by arranging groove structures in the inner yoke. The direction of groove arranged in inner yoke was determined based on the formation mechanism of inner yoke iron loss. Through simulation and calculation based on finite-element model of electromagnetic field, the authors investigated the effects of the number of grooves as well as groove width on the iron loss and performance of ELA. The optimal grooving scheme of ELA was determined by comprehensive analysis and analytic hierarchy process. Finally, block and static force tests were carried out based on ELA prototype. It was found that the simulation results were consistent with test results, indicating the accuracy of the simulation model.
... In these cases, the oscillatory frequency varies approximately from 1 Hz to several hundred hertz, and the oscillatory stroke is commonly designed to range from 1 mm to several hundred millimeters, and the power varies from 1 W to 10 kW. For example, in [6], an application of microphones and loudspeakers in cellular phones was presented, where the oscillatory frequency is the sonic frequency of Hz and the power is 25 W. A new LPMSM-driven hammer was introduced in [7], where the oscillatory frequency is about 5-20 Hz, the stroke is about 100 mm, and the power is about 1 kW. Typically, the oscillatory LPMSM-driven compressors are operated at 50 Hz, and the power ranges from 1 to 10 kW [8], [9]. ...
... Besides the energy efficiency, there are many other specifications and/or requirements for the design optimization of electrical machines, such as torque, power density, volume and weight. For special applications like geologic or petroleum drilling engineering and aerospace engineering, more requirements and extreme constraints should be investigated [4][5][6]. For example, the environment temperature for motors used in petroleum and geology may reach 300 °C, or even to 500 °C. ...
Article
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Electrical machines are the hearts of many appliances, industrial equipment and systems. In the context of global sustainability, they must fulfill various requirements, not only physically and technologically but also environmentally. Therefore, their design optimization process becomes more and more complex as more engineering disciplines/domains and constraints are involved, such as electromagnetics, structural mechanics and heat transfer. This paper aims to present a review of the design optimization methods for electrical machines, including design analysis methods and models, optimization models, algorithms and methods/strategies. Several efficient optimization methods/strategies are highlighted with comments, including surrogate-model based and multi-level optimization methods. In addition, two promising and challenging topics in both academic and industrial communities are discussed, and two novel optimization methods are introduced for advanced design optimization of electrical machines. First, a system-level design optimization method is introduced for the development of advanced electric drive systems. Second, a robust design optimization method based on the design for six-sigma technique is introduced for high-quality manufacturing of electrical machines in production. Meanwhile, a proposal is presented for the development of a robust design optimization service based on industrial big data and cloud computing services. Finally, five future directions are proposed, including smart design optimization method for future intelligent design and production of electrical machines.