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Motivation for research Magnetic bearings have been widely used in high-speed rotation system, machinery, aerospace, and high precision system because of the numerous advantages of non-contact rotating machines, such as a no wearing, low loss, long life span compared with conventional bearings, and absence of lubrication [1][2].
Bearingless permanent magnet synchronous motor (BPMSM) has attracted considerable interests because of small size and lightweight, high power factor and high efficiency, and no need excitation current.
A mathematical model enabling to predict the electromagnetic x−y forces and torque for a given input current in a Multi-Sector Permanent Magnet Synchronous (MSPMS) machine is presented. The rotor static eccentricity is also accounted and the analytical calculations are validated by means Finite Element Analysis (FEA). Furthermore, a novel force and torque control is proposed based on input current...
This paper presents a Lorentz actuator, which generates repulsive levitation and propulsion forces using only one permanent magnet. It provides a compact and cost-effective solution for magnetically levitated planar systems. Based on the proposed Lorentz actuator, a novel six degrees-of-freedom (6-DoF) magnetically levitated planar positioning system will be presented. The main advantage of the proposed...
At load operation, suspension control of bearingless motors are became unstable by interference of the motor flux. Therefore, it is necessary to decoupling compensation for stable magnetic levitation. Conventionally, perform the parameter identification test of suspension force by attaching a special jig to bearingless motors. However, conventional method restricted in the shape of the rotor. The...
In the complex rotor bearing systems all the components and control are interdependent. Changes in one non-modular element might require complete system redesign. Research on high-speed levitated blowers, pumps and compressors requires ability to test effectively different, often novel or customized, hardware and software components. This work introduces the laboratory test rig of modular construction...
This paper presents torque enhancement in a single-drive bearingless motor. The bearingless motor has a novel combined winding of a V-shape to generate rotational torque and active axial force. In previous machine, only the Lorentz force torque is generated. On the other hand, in this paper, both the Lorentz force torque and the Maxwell force torque are generated by improving the V-shaped winding...
A magnetically levitated motor can realize non-contact support of a rotor using magnetic force. Therefore, it has many advantages over conventional mechanical bearings. In order to accomplish complete magnetic levitation of the rotor, it is necessary to control five degrees of freedom actively. However, this gives rise to major issues such as complicated control system and associated electronics,...
In order to apply magnetic levitation techniques to Steel Industry, the authors have coped with its various basic problems and solved many problems piece by piece so far. As the next study target, we would like to try to adopt magnetic levitation techniques into production lines for processing very thin and functional steel plates. However, in this case, there will be arisen a certain issue that we...
This paper describes a propulsion system for magnetically levitated vehicles with hybrid magnets, which were studied in place of streetcars and transportation systems in semiconductor production. The new propulsion system for the magnetically levitated vehicle proposed here is low cost and easy to make. We obtained dynamic experimental results and static experimental results of the linear switched...
All rotating electrical machines have air gap between their stator and rotor, the length of which is usually kept very small, to facilitate a better flux path. However this aggravates problem of unbalance magnetic pull (UMP) due to rotor eccentricity which in course of time may lead to rotor-stator rub contact. This paper discusses a numerical technique of determining UMP in a three phase induction...
The design stage optimization of passive magnetic bearing (PMB) for a flywheel energy storage system (FESS) is the result of computationally intensive task. Magnetic bearing are increasingly being used for large variety of applications. The paper presents the verification process of force vs. displacement for a PMB conducted with analytical computation and compared with a finite element analysis (FEA)...
The paper presents the method of rotor magnetic radial forces calculation, caused by the static radial rotor eccentricity and magnetic rotor asymmetry. The method is applied to calculate the total force acting on the rotor of high-speed permanent magnet (PM) synchronous machine (PMSM). The calculations are based on 2D simulation of magnetic field distribution in the active part of the machine, and...
One of the important elements in an Active magnetic Bearing system is the electromagnetic coil. The shape and size of the magnetics depends upon the physical structure of the bearing system and its load bearing capacity. This paper presents an experimental design, fabrication and testing of magnetics used in an axial active magnetic bearing system. The designed magnetic coil is capable of supporting...
Active Magnetic Bearings (AMBs) are now widely used for high rotational speed applications; where friction and maintenance cost are to be minimized; such as turbo-machinery and high speed compressors. Conventional PID controllers are commonly employed in these systems. The high speed variations cause gyroscopic effects which degrade the system performance. Moreover, under high speeds, AMB systems...
In this paper, a novel active vibration control method for house structure by using magnetic levitation (MAGLEV) is proposed. Instead of active mass damper (AMD), a MAGLEV device is developed to provide the force for reducing the vibration from the wind or transportation. When a vibration occurs, the developed MAGLEV device will repeat to levitate and contact to the ceiling of housing properly. According...
To solve the problem caused by the heavily axial gravity load of the rotor and main shaft of the hydraulic generators, a superconducting induction magnetic levitation device is proposed for hydraulic generator system. AC superconducting windings are implemented to increase the levitation force. The basic structure and principle are introduced. According to the calculated magnetic field distribution,...
Recent OLED display manufacturing process requires non-contact conveyor systems not generating particles to increase productivity. To avoid supplying power and heating in vacuum, a passive maglev transport system can be a promising solution because it has no actuators in moving carriers and all actuating electromagnets are installed on the ground. In this paper, we deal with the design and control...
The semi-high-speed magnetic levitation (Maglev) train currently being developed in Korea uses linear induction motors (LI Ms) for thrust. LI Ms have very high operation reliability and relatively low production costs. However, when applied to Maglev trains, their operation efficiency is lowered because of the large air gaps. Therefore, this paper analyzes in detail the driving force, normal force,...
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