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Conventional switched reluctance motor undergoes extensive vibration and undesirable acoustic noise caused by the production of significant amount of radial force. The reason behind this is the non-uniformity in air-gap of the motor which can be controlled in order to make it more efficient. A viable solution to pacify this problem is the introduction of bearingless technology with a special winding...
In this paper, a new thin yoke modular linear flux-switching permanent magnet (TYMLFSPM) machine with fault-tolerant capability is proposed. The analysis for the proposed TYMLFSPM machine is carried out by the finite-element method. The ratio of mover pole pitch to stator pole pitch is optimized to increase the thrust force and thrust force density.
Electromagnetic force and torque computations for a bearingless synchronous reluctance motor presents multi-input complexity, which can be challenging to handle by look-up table. A novel methodology of choosing efficient snapshots for the model order reduction is proposed in this paper to compute the torque and electromagnetic forces on rotor with much less computational burden.
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,...
Linear vernier permanent magnet machines (LVPMMs) for direct-drive servo applications are attracting more and more attentions due to its high force density, easy maintenance, rapid dynamic response, etc. This paper proposes a new LVPMM structure which has a similar secondary as that of a regular linear PM machine, while its primary mover is composed of three modules, which are separated by flux barriers...
In this paper, the energetic management of the Segway PT i2 is studied. The Segway PT is a human transporter that uses two electric machines, one on each wheel. Each electric machines uses redundant set of windings to guarantee the safety. A multi-set of windings system offers several operating modes. Different kinds of control can then be obtained in normal and fault mode. First simulation results...
This paper presents a new yokeless Linear Switch Reluctance Machine (LSRM) for Urban Rail Transit System (URTS) which primary and secondary sides both feature modular structure. The primary side consists of independent cores of different width with the bigger core wound by a simple concentric winding while the smaller core remains unwound. The secondary, i.e. the stator of the LSRM includes series...
It is difficult to start permanent magnet synchronous motor (PMSM) when rotor initial position is unknown. To solve this problem, a PMSM starting scheme is proposed based on force analysis of the rotor located in different initial positions. Firstly, the equivalent model of PMSM's rotor is established and influences of rotor initial position on PMSM starting are analyzed. Then, the principle of PMSM...
This paper investigates the influence of magnet height on the unbalanced magnetic force in rotationally asymmetric surface-mounted permanent magnet machines without rotor eccentricities. It shows that increasing the magnet height can effectively minimise the unbalanced magnetic force in rotationally asymmetric machines having pole number equal to 3k+1, where k is an integer number. However, the unbalanced...
This paper provides a direct-drive electromagnetic active suspension system which consists of a double- stator air-core tubular permanent magnet linear motor (DATPLM) in parallel with a coil spring. The topology of magnetic pole can be radial-magnetized, axial- magnetized and Halbach-magnetized. The proposed DATPLM can operate in both motor mode and generator mode which allows for bidirectional energy...
In order to solve serious coupling problem among torque and suspension forces, increase output torque and improve fault tolerance performance for bearingless brushless DC (BBLDC) motors, a novel five-phase double-stator BBLDC motor is designed in this paper. Firstly, basic structure and operation principle of the BBLDC motor are analyzed in detail. Secondly, according to the Maxwell's stress tensor...
Abstract-A novel bearingless flux-switching permanent magnet (BFSPM) motor is proposed in this paper. Its suspension force windings, permanent magnets (PM) and armature windings are in the stator, while there is no PMs or windings are in the rotor. Firstly, its motor configuration and radial suspension force operation principle are introduced. Then, its static characteristics such as torque and radial...
Two yokeless linear flux-switching permanent magnet (LFSPM) machines are studied in this paper. Here, a double-sided LFSPM machine with yokeless secondary and a double-sided LFSPM machine with yokeless primary are analyzed with emphasize on the structure, flux distribution and trust force. Beside, the cogging forces of the two machines are reduced by shift a horizontal displacement between the stator...
The pole placement control with motion decoupling and integral action, according to the full modal synthesis, is addressed in this paper, to control a 1 kW, 18000 min−1 double conical Bearingless Permanent Magnet Synchronous Motor prototype. An electro-mechanical model of the prototype is derived analytically together with the design of the control scheme. The design of a pole placement scheme, with...
This paper presents a new estimation method of magnetic suspension loss in one degree-of-freedom (1DOF) actively positioned single-drive bearingless motors. In the 1DOF bearingless motors, only axial z-axis direction is actively positioned. The other axes, radial movements and tilting movements, are passively stabilized. Single-drive bearingless motors can generate both torque and active axial force...
Needles used in percutaneous insertion must be as thin as possible to minimize invasiveness. However, using extra-thin needles with a diameter less than 25G (0.53 mm diameter) can cause needle deflection. Needle deflection can be minimized by insertion with axial rotation along the needle shaft; this rotation is also useful for steering the insertion direction of the needle tip. However, although...
In this paper, the performance analysis of the bearingless switched reluctance motor (BSRM) is studied under rotor asymmetric faults. The rotor asymmetric faults cause acoustic noise and vibrations in BSRM, and also affect the performance of the motor. At different currents and different eccentric faults (i.e. SE, DE and ME) the flux linkages, inductance of suspension and motoring windings are taken...
The levitation control of Bearingless motor depends on the bias magnetic field provided by the torque winding. Bearingless induction motor (BIM) became one of the earliest and most widely used types. In order to suspend the rotor of bearingless induction motor, a compensation control method for radial suspension force was proposed in this paper. Firstly, the principle of suspending the rotor was analyzed...
This paper presents simplified design of a planar induction motor climbing an inclined steel plate. The motor set-up consists of two individually controlled linear motors firmly coupled via an aluminum frame with a drive system to provide 1-D translational and rotational motion. The motor set-up is also equipped with a position sensor to locate the mover in real time. To simplify the motor structure...
The levitation control of Bearingless motor depends on the bias magnetic field provided by the torque winding. Bearingless induction motor (BIM) became one of the earliest and most widely used types. In order to suspend the rotor of bearingless induction motor, a complete control method for radial suspension force was proposed in this paper. Firstly, the principle of suspending the rotor was analyzed...
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