This paper presents an equivalent winding model of a small and medium permanent-magnet synchronous motor. The considers fill factor void ratio. To verify the model, two samples are made. One is annular adopts ordinary enameled wires. other circle but self-adhesion Temperature rises supplied with different current densities tested. calculated tested results were compared. also used for temperature calculation 6-pole/9-slot permanent magnet influence ratio on rise motor investigated, as well...

Modularization design has been widely used to reduce the detent force of permanent magnet linear synchronous motor (PMLSM). For modular PMLSM, ideally, unit motors are independent each other and whole is sum that for motors; thus, motor's can be suppressed by adjusting phase difference among motors' forces. But actually, there coupling effect between adjacent motors, which adverse on suppression. The changes magnetic field distribution, often neglected in current research. Hence, this paper...

Slot-less tubular permanent magnet synchronous linear motor, usually adopts a cylindrical pole structure. It results in big leakage flux on the axis and serious uneven distribution secondary iron. The improved convex was used researched this paper, layered orthogonal optimization method applied to reach goal of higher thrust less dosage combing with finite-element method. Therefore, best values parameters were obtained. Because detent force resulting from end effect is hard suppress under...

To overcome the disadvantage that detent force of permanent magnet linear synchronous motor (PMLSM) with short primary is large, a scheme modular PMLSM flux barriers proposed in this paper. First, model established and verified. The phase-angle characteristics harmonics waveforms are analyzed. Then, design principles different sectional combinations analyzed, two series demonstrated. thrust these subsequently compared. In addition, to improve density, auxiliary teeth set at ends cores...

This paper focuses on the thrust ripple of a permanent magnet linear synchronous motor (PMLSM). The PMLSMs with North–South (NS) and consequent (C) poles are compared first. Then two magnetic regulating structures whose widths τ τ/3 (τ is pole pitch) proposed set primaries, forming Modulars I II structures, respectively. effects that modular exerting detent force voltage harmonics expounded. At last primaries selectively applied to different poles: structure employs permeable material C-pole...

In recent years, there has been significant research and practical application of machine learning methods for predicting reservoir pore pressure. However, these studies frequently concentrate solely on blocks exhibiting normal-pressure conditions. Currently, exists a scarcity addressing the prediction pressure within characterized by abnormally high pressures. light this, present paper introduces learning-based approach to predict The methodology is demonstrated using X block as case study....

This paper investigates a modular slotless tubular permanent magnet linear synchronous motor, which includes several sectional motors by setting flux barriers and rearranging windings. It focuses on the design method of different combinations with small detent force. The force models whole motor are established analytically in terms Fourier expansion verified prototype. Then principles analyzed. On basis models, schemes whose barriers' widths equal to one-third pole pitch selected, followed...

A novel flux switching permanent magnet linear motor (FSPMLM), which has the advantages of high thrust density [the ratio average to (PM) volume] and low cost for long-stroke application, is proposed investigated in this article. The topology FSPMLM with 12 slots introduced basic operating principle analyzed first. optimal geometric parameters are selected by using layered orthogonal optimization method. Then electromagnetic performance analytical method based on equivalent magnetic network...

Affected by the end effect, inductances of slot-less tubular permanent magnet synchronous linear motor (TPMSLM) are unbalanced. This paper reports research on inductance unbalance and thrust ripple characteristics for TPMSLM, it presents an optimization scheme adopting modular structure with a three-segment primary component. The characteristic is obtained quantitatively investigated based finite element models. causes self-inductance mutual-inductance explained, respectively, difference...

Conventionally, for a tubular permanent magnet synchronous linear motor (TPMSLM), adopting modular structure can effectively reduce the detent force; however, thrust density is sacrificed via large proportion of flux barrier to total primary component volume. To overcome this disadvantage, paper proposes novel TPMSLM, in which unit adopts slot containing several coils. Focusing on motor, research linkage characteristic performed obtain design principle, and then force analyzed suppressed by...

In this paper, a novel velocity and current double closed-loop control scheme applied to the permanent magnet linear synchronous motor (PMLSM) drives is proposed, suppress various uncertainties disturbances, advanced observation technique introduced. First, as inner loop, loop adopts predictive method, which can increase bandwidth tracking precision. To improve dynamic response robustness of super-twisting sliding-mode strategy presented. Second, overcome parameter mismatch issue in...

A segmental permanent magnet linear synchronous motor (S-PMLSM) with noninteger pole number, which has low detent force and high thrust, is presented in this article. For the S-PMLSM, structure makes up for defect that conventional integer cannot suppress third its times harmonics force, thereby further reducing thrust ripple rate of motor. Special winding arrangement adopted structure, factor relatively high. Another advantage decoupling between cogging force. When designing parameters...

For permanent magnet linear synchronous motor (PMLSM), the end effect not only changes distribution of magnetic field, but also causes pulsating field in air gap between primary and secondary components. In this paper, existence is proved characteristics are analyzed through finite element analysis. On base that, influence on detent force studied, which result shows that generates force, a part force. The amplitude closely related to length component. By adjusting component, can be...

The bottom hole fluctuating pressure has a large influence on the wellbore instability. To address this problem, firstly, according to principle of seepage mechanics, we established calculation model change in pore around radius under pressure; then, through laboratory rock mechanics test and damage theory analysis, law formation strength action static hydration dynamic are determined; finally, based porous media, quantitative evaluation method for risk instability is changing pattern...

Abstract There is not only thrust but also normal force between the primary and secondary components for single‐side flat plate permanent magnet linear synchronous motor (PMLSM). The will fluctuate periodically, which cause friction perturbation finally affect positioning accuracy of feed system. For PMLSM, variation law ripple under coupling effect multiple effects studied, method component segmental design to suppress it proposed. Firstly, influence cogging effect, end armature reaction on...

As an ideal current control method, the superiority of predictive (PCC) is seriously weakened by one-step delay and parameter mismatch issues. To acquire high dynamic static characteristics, this paper studies improved PCC scheme for permanent magnet linear synchronous motor (PMLSM) drives. First, discrete-time model PMLSM considering variation established. Second, formation mechanisms these two issues are analyzed in detail, respectively. Meanwhile, through replanning timing sequence logic,...

For permanent magnet linear synchronous motor (PMLSM) working at trapezoidal speed for long time, high thrust brings temperature rise, while low limits dynamic performance. Thus, it is crucial to find a balance between rise and In this paper, velocity planning model of the PMLSM based on electromagnetic-fluid-thermal (EFT) field proposed obtain optimal performance under limitation. model, winding loss calculated considering acceleration deceleration time. The indirectly verified by...