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Magnetic suspension pumps have been attracted attention and actively developed. These pumps can realize magnetic suspension and rotation of a rotor shaft integrated with an impeller without mechanical contact. There is now a need to develop a magnetic suspension pump that is capable of 5-axis active control while retaining a small size and low power output. However, conventional structures capable...
Bearingless motors combine in the same structure the characteristics of conventional motors and magnetic bearings. Traditional bearingless machines rely on two independent sets of winding for suspension force and torque production, respectively. The proposed Multi-Sector Permanent Magnet (MSPM) motor exploits the spatial distribution of the multi-three-phase windings within the stator circumference...
The paper presents a new type of electromagnetic actuator based on the attraction forces generated by a pair of electromagnets over a ferromagnetic disk, which uses a differential magnetic spring to generate the return forces. The paper also shows some functional characteristics of this device, obtained by numerical simulation with COMSOL Multiphysics. The proposed actuator has been experimentally...
A maglev wind yaw system (MWYS) is proposed to decrease the yaw power with the hybrid magnet. A disc motor and a variable speed gear are introduced to weaken the coupling between the suspension force and yaw torque. Firstly, we analyze the operation principal of the MWYS, and give the detailed description of the suspension weight and rotary torque. The rotor ample turns are given based on the Magnet...
This paper investigates single-sided ironless linear synchronous motor (ILSM) based on permanent magnet Halbach array used for medium-speed maglev. Long primary ironless coil is laid along the track and the Halbach permanent magnet array is attached to the bottom of each bogie as a source of traction, two dimensional analytical model of single-sided ILSM is established used to calculate the characteristics...
In this paper, the equilibrium orientations of magnetically suspended platforms that are statically loaded and constrained to 2 degrees of freedom are analyzed. It is shown that under these conditions, a symmetric, 2-magnet system can have a maximum of two equilibrium orientations for a given force-moment load. Further, it is shown that these two equilibrium orientations can exist arbitrarily close...
The feasibility of zero-power control in flux-path control magnetic suspension is discussed. In the flux-path control magnetic suspension system, ferromagnetic control plates are inserted between a permanent magnet (magnetic source) and a floator and moved to vary the flux from the magnetic source to the floator. The zero-power control has been applied in active magnetic suspension with a DC electromagnet...
This paper presents the development of the single side ironless Halbach permanent magnet linear synchronous motor (PMLSM) for a novel electromagnetic suspension (EMS) maglev vehicle. The basic structure of the propulsion motor and the vehicle are firstly described. Then the thrust and normal force of the ironless PMLSM are analyzed. The configuration of the propulsion system and field oriented control...
When controlling the electromagnetic Suspension system, generally used the displacement sensor. But the Electromagnetic Suspension System using a displacement sensor accuracy of velocity calculation cause problems. This research theme is to solve this issue instead of using force sensor.
In flywheel system, rotor is supported by mechanical bearing. In the cases that the weight of the rotor is heavy and the rotational speed is high, mechanical loss is large. Superconducting magnetic bearing (SMB) is introduced to support with contact-less and control-less. The rotor is supported by the pinning effect in SMB. Pinning force depends on the specification of the HTS. In this paper, the...
Adopting magnetic levitation techniques in Steel Processing Industries is a beneficial way in maintaining the high quality of steel's surfaces. However, the control for levitation and guidance is not so easy, because of difficulties in mechanical and magnetic characteristics of steel, especially in those of thin steel plates. We have already established the stable magnetic levitation and guidance...
Superconducting magnetically levitated transportation system has been developed. The electrodynamic suspension is used for levitation and guidance. Results of numerical simulation show that the damping factor of this EDS system is small. Thus the damper coil system is introduced to increase damping against oscillation of the bogie. This damper coil system has effect on decreasing oscillation of the...
The Conventional conveyance systems have problems such as vibration, noise and raising dust. Most system consists of the levitation (and guidance) section and the thrust one. In this research, by using the linear stepper motor, these sections are combined. The experimental device to realize this system has been made. Because the coil is controlled by high switching frequency for levitation, the improved...
This paper presents a ironless actuator with two degrees of freedom (2-DoF), which generates a magnetic levitation and propulsion force. It is characterized by a very simple compact construction with a freely accessible mover from above. As a result, it provides a cost-effective solution for vacuum compatible high precision magnetically levitated planar systems. Two possible topology based on this...
The magnetic levitation transport system is developed. In this system, by using the pinning force of the HTS, stable levitation and guide without control is realized. Propulsion force is generated by the interaction between the permanent magnet and the air core copper coil (propulsion coil). Since a larger propulsion force is required to improve the propulsion characteristics, the pinned flux of the...
Traditionally, active magnetic levitation systems in rotor applications comprise separate motor for torque production, two or more radial active magnetic bearings (AMBs) and one axial AMB. Such an arrangement produces long rotors. Resulting AMB-rotor systems are often supercritical making the levitation control challenging. The centralization of the torque and force producing actuators shortens the...
Eccentric mass unbalance of the electric motor causes vibration of the shaft and the whole system, when the rotational speed increases. This paper considers rotation about an estimated center of inertia for a bearingless motor to reduce the vibration and power consumption for magnetic suspension. A 12-slot/10-pole bearingless SPM motor is selected for the performance test, because it has low suspension...
This paper investigates the cross-coupling effect of a 3 degrees of freedom magnetic bearing (3-DOF MB) using the magnetic circuit method comprehensively. The EMF of X-axis (or Y-axis) coil induced by the current variation Eix (Eiy) can vary in a range of up to 14.7% due to the cross-coupling caused by Z-axis current. Moreover, the X-axis (or Y-axis) force characteristics and stiffnesses are significantly...
A hybrid high temperature superconducting (HTS) linear synchronous propulsion system composed of a HTS linear synchronous motor (HTSLSM) in the middle and HTS magnetic suspension sub-systems on both sides has been proposed for a high-speed maglev train. Four carriages have been made up for the proposed maglev, and each carriage consists of four HTSLSM modules, which weight 45 tons. The maglev train...
This paper presents parameters self-turning fuzzy control of magnetic levitation system of controllable excitation linear synchronous motor(CELSM) magnetic suspension feeding platform. Magnetic suspension feeding platform has the characteristics of direct drive and magnetic suspension, which meet requirements of high speed, high positioning precision. Magnetic levitation system is an important subsystem...
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