The 3-degrees of freedom magnetic bearing (3-DOF MB) with permanent-magnet (PM) biased has been applied to high-speed motor progressively for their advantages small thrust disk, low wind friction loss, and volume. To predict performance guide design the 3-DOF MB, an accurate analytical model including eddy-current effects leakage is proposed. Both solid laminated cores are in therefore different core materials modeled separately. frequency response characteristics axial radial stiffnesses...

The utilization of nanocrystalline magnetic shielding can provide a low-noise weak environment for various ultra-high sensitivity measurements. Their interlayer insulation properties effectively impede eddy currents, thereby ameliorating current losses and diminishing noise within the structure. However, nanocrystal's thin-layered structure stacking process greatly impact its effective permeability conductivity. Hence, this article presents quantitative evaluation research methodology...

To provide a more reliable and low power consumption rotor support system for high-speed compressor, novel compact magnetic bearing damping is proposed. It composed of cup-shaped rotor, an axial passive reluctance type outside the cup, damper with Halbach magnet array inside which not only can adequate stiffness, but also good ability rotor. enhance load stability system, analytical model, calculate stiffness coefficient significantly less computing time than finite element method (FEM),...

With the development of magnetic bearing (MB) and its application in industry, demands high-speed MB are developing, which bring up new problems requirement for design. The motor with a rigid rotor requires that axial length is minimized to increase critical speed, diameter thrust disk reduce air friction loss. Also because high eddy currents induced iron cores have significant influence on dynamic characteristics MB. To design high-performance motor, first an structure has feature short...

A successful application of the single-gimbal magnetically suspended control moment gyro (SGMSCMG) requires careful attention not only to electromagnetic design and feedback aspects magnetic bearing (MB) but also decoupling between high-speed MB rotor system low-speed gimbal servo system. The key parts with low loss a large-scale SGMSCMG for large spacecraft are proposed. low-loss MBs that consist thrust radial active PM bias proposed (MSCMG) when considering torque. Finally, test results...

In this paper, a novel structure of four degrees freedom (4-DOF) hybrid magnetic bearing is proposed for double gimbal magnetically suspended control momentum gyro (DGMSCMG). It includes two active parts and one passive part, every part has eight stator poles around the circumference in X Y directions, which are divided into upper lower layers. The whole rings, located middle 4-DOF bearing. radial force analyzed by equivalent circuit method (EMCM) axial resilience infinitesimal based on end...

This article presents a hybrid optimal design of biplanar coils, which produce uniform fields and field gradients. It treats the coil issue as nonlinear programming problem, seeks best performance via algorithm. The target method is first utilized to obtain initial coefficients ranges searching areas in stream functions. Then, magnetic relative error defined fitness function for minimization, particle swarm optimization algorithm adopted optimize aforementioned coefficients. not only...

In this paper, the design and development of a novel magnetic bearing (MB) system which consists passive (PMB) with two pairs permanent magnet rings hybrid radial (HMRB) used in flywheel (MBFW) control moment gyroscope (CMG) for agile satellite application are presented. The models PMB HMRB proposed their performances force-current, force-position, torque-angle analyzed using equivalent circuit method, finite element method (FEM), charge method. coupling forces between x y position degrees...

The nutation mode is an obstacle to the stability improvement of a magnetic-bearing-supported rotor system with significant gyroscopic effects. This article explores parameter design method filter cross feedback for suppression asymmetric systems supported by active magnetic bearings (AMBs). First, coupled multi-input multi-output model AMB converted into equivalent complex single-input single-output model. transformation aims at easing analysis and extending classical criterion coefficient...

In magnetic suspended centrifugal compressors, the unbalanced pull (UMP) may cause saturation on power amplifier currents driving coils of active bearing (AMB), eventually affecting stability rotor. This article addresses issue stable operation AMB-rotor system subject to UMP. A mathematical model UMP with uneven magnetization permanent magnet (PM) and eccentricity is proposed for a surface-mounted PM synchronous motor supported by bearings. Based this model, an improved radial (RMB) control...

Many magnetically suspended compressors operate above the first bending critical speed, which gives rise to high vibration problems and introduces complications in designing controllers for radial magnetic bearings; besides, a significant axial load always exists high-speed compressors, requires capacity thrust bearings bearings. In this paper, passive damper with Halbach magnet array is proposed. The can provide damping force without control system, also large reduce burden of bearing....

The industry application of magnetic bearing (MB) has recently extended from rigid rotor system to flexible system; therefore, the design method MB for is required. To reduce inductance control coils and improve dynamic performance, a radial with novel coil arrangements connections proposed in this paper. An optimal presented, which includes simultaneous consideration itself, rotor-dynamics characteristics controller, power amplifier (AMP). equivalent circuit, takes eddy current effects into...

The miniaturization requirements have been put forward to the sensors for development of modern industry. However, traditional inductive displacement sensor applied active magnetic bearings (AMBs) has complicated detection device and measuring circuit with excessive discrete components which cannot meet miniaturization. To remedy infliction, an optimized differential self-inductance was designed AMBs. Concretely, operating principle analyzed in detail. Then structure proposed designed. After...

This article presents a modified pigeon-inspired optimization method for designing self-shielded uniform magnetic field coils that offers an innovation in miniature atomic sensors. The proposed coil system consists of circular pairs distributed on two coaxial cylinder surfaces, which can provide highly at the center and rapidly attenuate external field. design is transformed into nonlinear objective problem with constraints, so geometric parameters be obtained by algorithm, instead solving...

This paper presents the design in electromagnetic aspect of a high-speed solid cylindrical permanent-magnet (PM) machine equipped with magnetic bearings. First, selection PM structures is discussed. In specific, analytical models field for and ring are established; then, these two configurations compared from perspectives rotor eddy-current losses, results show that machines have higher power density lesser losses than machines. Subsequently, described, some integrated considerations...

Accurate rotor position is necessary for high-performance control of a permanent-magnet synchronous motor. Compared with the methods using sensors to detect position, sensorless can simplify motor structure and enhance reliability. To improve estimation accuracy methods, error correction method based on low-order harmonic suppression proposed in this article. The harmonics generated by are analyzed detail, which will cause extra losses. signal be reconstructed that extracted rotating frame...

To decrease the mass and power loss of axial hybrid magnetic bearings (HMBs) in application inertially stabilized platform (ISP) with a large diameter, this paper investigates effects layout HMBs degree asymmetry (DOA). An HMB is proposed for ISP based on DOA. Each single modeled analyzed using reluctance network method. And relationship between current force, as well displacement are studied. Additionally, optimization design method presented According to principle design, complete designed...

A hybrid radial magnetic bearing (HRMB) with permanent magnet creating bias flux is used to reduce the power consumption. Laminated cores are widely in HRMB eddy currents. Nevertheless, when frequencies of rotation and control curr

For the high‐frequency permanent magnet electrical machine, a reasonable mechanical aspect design is crucial to meet its stability and reliability. This study focuses on accurate modelling analysis of natural frequencies modes rotor assembly for designed manufactured 100 kW 32,000 r/min motor. The influence contact stiffness friction bending analysed in detail. To obtain results first two frequencies, basis finite‐element method, optimisation method carried out acquire appropriate variables...

This paper explores a disturbance force self-sensing and suppression method for active magnetic bearings (AMBs) system. Since the displacement of AMB-rotor is affected by both output controller force, mathematical expression external deduced based on inverse model controlled plant The rotor are input A third-order low-pass filter added to system so as avoid being unstable due uncertainty plant. Then an adaptive notch used eliminate synchronous frequency component in estimated disturbance....

Unbalanced magnetic pull (UMP) disturbance seriously affects the stable operation of magnetically suspended rotor (MSR) system. This article proposes an UMP suppression method based on a linear extended state observer (LESO) and adaptive peak filter (APF). The cascade structure LESO APF can accurately estimate in whole speed range. First, dynamic model active bearing systems is established caused by eccentricity MSR system analyzed. Second, third-order are designed. performance evaluation...

Demagnetization fault diagnosis is a significant issue in magnetically suspended permanent magnet synchronous motor (PMSM). The occurrence of (PM) demagnetization reduces the efficiency and even disables whole power system. Unfortunately, it challenging to extract feature evaluate exact severity precisely due rich environmental noise coupling faults. This article proposes novel strategy using improved variational mode decomposition (VMD) energy moment relative entropy (EMRE) achieve...