The uniform magnetic field coil can be placed in the shielding room (MSR) to provide a more accurate source. could generate by conventional design method, but when MSR, uniformity of would affected. analysis model based on cuboid ferromagnetic boundary condition is constructed image method. This paper proposes new method parameters deviation distribution volumes boundary. system shield designed compared with system, which not only solves problem reducing, also further improves field....

The quest for efficient and tunable luminescent materials has been at the forefront of research in fields chemistry science. This work delves into investigation luminescence properties Er3+ ions triggered by 1% Te4+ environmentally benign perovskite Cs2NaYbCl6 (CNYC) crystals, aiming to enhance their efficiency tune color. ratio green (2H11/2, 4S3/2–4I15/2) red (4F9/2–4I15/2) emissions can be freely varying concentration producing defects induced codoping Te4+. calculations reveal that...

This paper proposes an enhanced system-delay-tolerant signal processing method for high-frequency (HF) injection based position sensorless interior permanent magnet synchronous machine (IPMSM) drives. To reduce the acoustic noises induced by HF response current using conventional fixed-frequency sinusoidal method, pseudorandom-frequency strategy is proposed and comparatively evaluated in terms of power spectral density phase current. Furthermore, estimation degradation caused system delay...

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...

This paper presents an analytical model of magnetic field a permanent magnet synchronous motor (PMSM) with trapezoidal Halbach array (THPMA). Compared conventional array, the shape each in THPMA is transformed from rectangle to trapezium polar coordinates. The delaminated indefinitely radially and layer approximately considered be array. air-gap analyzed scalar potential. Then, obtained by superposing fields all layers. validity verified finite-element (FEM). flux density optimized adjusting...

Phase-shift or pole-shift method can reduce the detent force of double-sided permanent magnet linear synchronous motor (DS-PMLSM) dramatically. However, this causes a decrease in thrust and an increase normal simultaneously. To overcome drawback, novel slot-shift structure whose slots on two sides primary component are staggered by optimal distance is proposed paper. The models including end cogging established theoretically, then verified finite element analysis. windings upper lower...

The permanent-magnet synchronous motor (PMSM) with high efficiency and power density is now attracting more attention, which could be largely used in occasions supplied by limited energy restricted weight or capacity, for example, the electric vehicles solar unmanned aerial vehicles. In this paper, electromagnetic thermal issue of a PMSM has been researched. We comparatively analyzed characteristics outer-rotor PMSM. influence parameters on analyzed. Through researching Halbach array, we got...

During the last decades, development of increasingly sensitive magnetic sensors led to numerous applications field measurements in neuro-science, medical diagnostics, brain-computer interfaces, metrology or for experiments testing fundamental laws nature. Especially small, lightweight, rather mobile and easy handle optically pumped magnetometers allows more advanced dynamic studies of, e.g., brain. The limitation quality such signals are gradients drifts measuring environment. This article...

The triaxial fluxgate magnetometers (TFMs) are widely used in space exploration, positioning and navigation, geological etc. As a high-precision vector magnetometer, the measurement accuracy will directly determine of obtained magnetic field data. TFM has three kinds own errors measurement: zero offset error, proportional coefficient nonorthogonal error. These cause to deviate from actual value, magnetometer needs be calibrated. At present, calibration method adopted by depends on stability...

In this article, a uniform magnetic field coil with shield is presented and designed to cancel the geomagnetic surrounding noises. First, an analytical model of developed, based on Biot–Savart law traditional images method. Second, in order improve accuracy, influence noninfinite thickness produced by considered using multireflection theory, improved obtained. The verified three-dimensional finite-element method, its accuracy significantly compared previous analysis model. Then,...

The air gap of tubular linear motors moves linearly, causing heat transfer states the motor to alternate repeatedly. Thus, coefficients mover inner surface and stator outer vary constantly. In this paper, combination model thermal circuit temperature field is established calculate transient rise a with short movable primary. equivalent moving models primary (also named as mover) secondary stator) are established. boundary conditions correlations among them analyzed. By method, complicated...

In this paper, the thermal analysis of a hybrid excitation linear eddy current brake is presented. The air gap flux provided by windings and permanent magnets. Therefore, braking force produced large controllable. But, on other hand, there high heating value in conductor plate; hence, it necessary to analyze characteristics avoid declination performance or even damage device. First, structure working principle are described. Second, analytical model built, then network built taking actual...

This paper deals with design optimization of air-cored permanent magnet linear synchronous motors overlapping windings to achieve high thrust per volume, coils quantity, motor constant, and low ripple simultaneously for ultra-precise positioning stage air-bearing. Based on accurate magnetic field model, parameters such as flux density, inductive electromotive force (EMF), are analyzed. A multiobjective method weight coefficients is proposed by applying the multiple population genetic...

Traditionally, straggering the primaries of double-sided permanent magnet linear synchronous motor (DS-PMLSM) is beneficial in helping to reduce detent force caused by longitudinal end effect, but leading a reduction average thrust. To overcome this disadvantage, paper provides novel DS-PMLSM, which adopts structure staggering two and rearranging windings. First, characteristics voltage are analyzed theoretically verified finite element (FEM) simulations. The inductance, thrust, normal...

The Forward Euler method is well known for its simplicity and ease of implementation in Permanent Magnet Synchronous Motor (PMSM) controls. However, it introduces significant errors, which becomes more severe when establishing the discrete-time model a high-order system high-speed PMSM with LCL filter. Traditional discrete methods, have smaller are too complex difficult to apply systems. To address these issues, this paper proposes sensorless control surface-mounted filter based on...

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...

Ultra-low magnetic fields have drawn lots of attention due to their important role in scientific and technological research. The combination a shield an active compensation coil is adopted most high performance magnetically shielded rooms. Special consideration needs be taken the design since significantly affects uniformity field that generated by coil. An analytical model for calculation inside cubic proposed based on generalized image method, which validated finite element analysis. A...

Iterative feedforward tuning (IFFT) enables high performance for motion systems that perform varying tasks without the need system models. In this paper, IFFT is employed a wafer stage to achieve good trajectory tracking and excellent disturbance compensation ability. Recently, instrumental variable (IV) approach has been introduced into algorithms (IV-IFFT), enabling unbiased estimates parameters of controller in presence stochastic noise. However, estimation variances achievable with...

Due to the enhanced air gap flux density and eddy currents in favorable path, current brakes with slotted conductors have attracted more attention recent years. However, due increased difficulty analytical modeling, there is currently no suitable model available for optimization design of conductor. To solve this problem, an improved provided based on subdomain least squares method article. The proposed considers conductor disk, magnetic saturation primary core actual path disk. accuracy...

The successful market uptake of all-electric propulsion systems is closely related to the performance metrics electrical motor used within. In light this, various road-maps have been set for next two decades by aerospace and automotive bodies targeting ambitious future targets motor's power densities efficiencies. achieving motors with such step-improvement metrics, often thermal management a key challenge. this paper, cooling structure solar unmanned aircraft proposed which combines stator...

This paper describes a tubular linear motor with special permanent magnet. Then, two kinds of magnet magnetization directions for this are proposed, and the air-gap magnetic field is calculated researched based on finite-element method. Moreover, slotless contrasted that traditional interior axially magnetized motors. Finally, advantages analyzed pointed out.